Electrical Power System Description Document Rev 002, ICN 00 000-3YD-EEOO-00200-000 June 2004 1. INTRODUCTION The purpose of this revision of the System Description Document (SDD) is to + establish requirements that drive the design of the electrical power system 'and their + bases to allow the design effort to proceed to License Application. This SDD is a living document + that will be revised at strategic points as the design matures over time. This SDD + identifies the requirements and describes the system design as they exist at this time, with emphasis on + those attributes of the design provided to meet the requirements. This SDD has been developed to be+ an engineering tool for design control. Accordingly, the primary audience/users + are design engineers. This type of SDD leads and follows the design process. It leads the + design process with regard to the flow down of upper tier requirements onto the system. + Knowledge of these requirements is essential to perforrning the design process. This SDD follows + the design with regard to the description of the system. The description provided in the SDD is+ a reflection of the results of the design process to date. Functional and operational requirements applicable to this system are obtained + from Project Functional and Operational Requirements (F&OR) (Siddoway, 2003). Other + requirements to support the design process have been taken from higher level requirements + documents such as Project Design Criteria Document (PDC) (Doraswamy 2004), the fire hazards + analyses, and the preclosure safety analysis. The above mentioned low-level documents address + Project Requirements Document (PRD) (Canori and Leitner 2003) requirements. This SDD includes several appendices with supporting infonnation. Appendix B + lists key system charts, diagrains, drawings, and lists; and Appendix C is a list of + system procedures. 1.1 SYSTEM IDENTIFICATION The electrical power system supports the repository facility infrastructure by + providing adequate and reliable electric power for construction and operation of all surface + facilities and subsurface facilities. The electrical power system consists of the following subsystems: + switchyard and standby power subsystem, nonnal power subsystem, and the emergency power + subsystem. A solar power subsystem may be added to the system in the future. Utility power on two separate transmission lines (one preferred and one + altemate) enters the site at the switchyard in the North Portal area. These feeds are stepped down to + 12.47 kV by the switchyard power subsystem transformers and sent to the two interconnected + 12.47 kV main switchgear buses in the north portal area and two interconnected 12.47 kV main + switchgear buses in the south portal area. Standby power consisting of diesel generators + can also supply the 12.47 kV switchgear buses if required. From the 12.47 kV main switchgear bus, + power is distributed to four normal power 4.16 kV switchgear buses (two in the North + Portal area and two in the South Portal area) for further distribution to site facilities and + subordinate switchgears. Some individual large loads and ancillary facilities are fed directly from the + 12.47 kV main switchgear buses. These buses also supply two 4.16 kV emergency switchgear + buses that supply redundant loads for life safety and egress fimctions. The emergency switchgear + buses can be supplied from connected Emergency Diesel Generators if needed. 000-3YD-EEOO-00200-000 REV 002 1-1 June 2004 The electrical power system interfaces with all surface facilities and the + subsurface facility. The electrical power system also interfaces with the electrical support system. The+ electrical support system consists of the following subsystems: • Lighting • Grounding • Lightning protection • Cathodic protection • Heat tracing • Cable raceway (including underground ducts). 1.2 LIMITATIONS OF THIS SYSTEM DESCRIPTION DOCUMENT As noted above, the electrical power system interfaces with the electrical + support system, which is described in a separate SDD. This SDD may include assumptions, preliminary inforrnation, and "to be + verified"(TBV) values, as appropriate to the current level of design development. Additionally, + requirements or descriptions that are stated as "to be detennined" (TBD) or are + expected at a later phase of the design will be described as such. At the time of the approval of this version, the status of the design is that + the conceptual design has been completed and the Title I preliminary design has been started. As the + necessary design documents (calculations, drawings, specifications, and other supporting + documents) are completed, the description of the system design will be updated. 1.3 OWNERSHIP OF THIS SYSTEM DESCRIPTION DOCUMENT This electrical power system SDD is owned by the Electrical and Control Systems+ group of Design and Engineering. 000-3YD-EEOO-00200-000 REV 002 1-2 June 2004 2. OVERVIEW 2.1 SYSTEM FUNCTIONS The electrical power system is described as follows in Section 1.4.1.2.2 of the+ F&QR (Siddoway, 2003): "The MGR[repository] shall be provided with adequate and reliable + electrical power supplies from transmission lines of the electric utility company and automatic switchyard switching through main transforiners for power + distribution in the MGR[repository]. The offsite power from the utility transmission line + shall be the norinal power for the MGR[repository]. The onsite standby and emergency diesel generators shall supply electrical power to the MGR[repositoryl upon + loss of offsite power." System fimctional requirements from the F&OR are contained in the + subsection titles. The implementing perfonnance requirements and operational requirements are + described in each subsection along with the section of the F&OR from which they are taken. 2.1.1 Receive and Distribute Adequate and Reliable Electrical Power Commercially available power shall be provided to meet an MGR[repository] power+ demand during construction and operations. {F&OR 1.4.1.2.2-11 2.1.2 Provide A Solar Power System to Augment Commercially Available Power A 3 MW solar power system shall be used in conjunction with commercially + available power. {F&OR 1.4.1.2.2-21 The solar power system is on hold and is not ftu-ther described in this SDD. 2.1.3 Provide Emergency Power The fimctional requirement from the F&OR is that during loss of primary + power, a reliable and timely emergency power system shall supply necessary monitoring and operating + power. The operational and performance requirement is that the MGR[repository] shall + ensure uninterrupted AC/DC power to instruments, facility service systems, + important-to-safety (ITS) operating systems, and to selected non-ITS systems. JF&OR 1.4.1.2.2-31 2.2 SYSTEM CLASSIFICATION This system consists of no structure, system or components (SSCs) important to + safety or natural and engineered barriers important to waste isolation. This system is in the + non-safety category (non-SC) and not the subject of the facilities operational or technical safety + requirements (TSR). 000-3YD-EEOO-00200-000 REV 002 2-1 June 2004 Additional infonnation regarding system classification maybe found in Q-List + (BSC 2003a), Safety Classification of SSCs and Barriers (BSC 2004c), and/or Preliminary + Nuclear Safety Design Basesfor License Application (BSC 2003c). 2.3 OPERATIONAL OVERVIEW Figure 2-1 is a simplified system drawing that shows the relationship of the + switchyard and standby power subsystem, norinal power distribution subsystem and emergency + power subsystem. The switchyard is located at the southwest comer of the North Portal Facility + area and receives power via 230 kV (preferred) and 138 kV (altemate) overhead transmission lines + from the electrical power utility company. Power can be transferred from one source to + the other through breaker controls. This power is stepped down to 12.47 kV by transforrners in + the switchyard and further distributed to the site through 4.16 kV switchgear buses in the 4.16 kV+ Switchgear Facility. There are several direct connected loads on the 12.47 kV main + switchgear buses. The standby power portion of the switchyard and standby power subsystem + consists of four Standby Diesel Generators (SDGs), two for each 12.47 kV main switchgear buses A+ and B. These are housed in the Standby Diesel Generator facility near the switchyard. + The SDGs supply loads should both the preferred and altemate utility supplies fail. The + loads that are supplied by the SDGs shall be detertnined in detail as the design matures. The nonnal power subsystem distributes power from the 12.47 kV main switchgear + buses via cables in underground duct banks to North Portal facilities and to the South + Portal facilities via an overhead transmission line. Normal power is also provided via overhead + transmission lines to the North Construction area, and shaft ventilation areas. Normal power is + stepped down to 4.16 kV by transfonners and distributed to repository facilities in the North Portal+ area via underground duct banks. Inside each facility, step-down transfonners are + provided for low voltage distribution by load centers, motor control centers, power panels, + instrument panels, and control panels as required. Power needed in the South Portal area is distributed from the South Portal + 12.47 kV Main Switchgear facility. The North and South Portal 12.47 kV switchgear facilities + each contain two switchgear. Norrnal power electrical loads are designated as A or B to balance + the loading on the system. The A and B normal power switchgears are provided with tiebreakers that+ permit connecting them together should this be necessary. The normal power subsystem + also provides battery-backed, 120 VAC uninterruptible power supply (UPS) power for required + loads (TBD). The 125 VDC system provides power for breaker control, protective relaying, and+ other required loads. A 125 VDC battery provides backup power to the normal 125 VDC loads. The emergency power subsystem supplies loads essential for safety of human + life, as defined in article 700 of the NFPA 70, National Electrical Code and IEEE Std 446-1995, + IEEE Recommended Practicefor Emergency and Standby Power Systemsfor Industrial and Commercial Applications. The loads supplied by emergency power are: post-event + monitoring system, communications, egress lighting in defined areas, limited select HVAC + units, and worker 000-3YD-EEOO-00200-000 REV 002 2-2 June 2004 industrial and life safety. The specific loads fed from emergency power shall + be deterrnined as the design progresses. Emergency power is distributed to required loads from two 4.16 kV emergency + switchgear buses that are physically and electrically separated and are located in the North + Portal 4.16 kV Switchgear facility. The normal supply to the 4.16 kV emergency switchgear + buses are from the 12.47 kV main switchgear buses. One emergency diesel generator (EDG) shall + supply each 4.16 kV emergency switchgear bus, if the nonnal supply is lost. The number of hours + of continuous operation provided by the integral fuel oil tank for each diesel will be + deterrnined as design matures. Some emergency power loads are supplied from battery backed UPS, which+ shall maintain power until the EDGs are up to full speed and voltage. 000-3YD-EEOO-00200-000 REV 002 2-3 June 2004 230KV LINE INE 13 8KV L PREFERRED T ALTERNA E MAIN ~FMR MAIN XFW SWITCHYARD AND STANDB 230-12.4TKV. 13B-12.12.47KV. 3 PHASE'60HZ 3 PHASE, IIHI POWER SUBSYSTEM T F_ NI NO 12 47kV MAIN SWGR B S WGR A 12.47kV MAIN . 12.47KV.4000A NC 47 11~17- iG~v 4. 6KV EMERGENCY POWER SUBSYSTE 4.16KV EMER SWGR A T 416OV.1200A EMERGENCY DTF D JESEL FHr GEN. CH CC F EM RGENCY LOADS 8 STINI)Bt "'ITAII ' 'E 'EL GE. 02 DIE L CEP 12.47kV MAIN SWGR 0 12.47KV.2000A 7 T T T 1 11.4 12.47- 1 1 12;4KT- G'KT; $.IBKVT 'T 4. 6 V 4. IIK 120GA 121111A REPQSITDRY RA. WATER SO TH PORTAL REPDSIT~Py 8 OCK BLOCK WELL PUWS NORMAL LOADS NORMAL LOADS Pqo 4*!GkV SWGR 6 y 4.16KV.2000A _' L' - 11 , - - - - T 4.16kV EMER SWGR B N RTH PORTAL F ACILITIES NORMAL LOADS NORTH PORTAL 4.IGKV SWGR C 4-16kV SWGR D ,FACILITIES RMAL LOADS 4 1 GOV. 1200A I OTF ENERGENCY FHF DIESEL CH F GEU-B CC C F EMERGENCY LOADS 000-3YD-EEOO-00200-000 REV 002 5 TA DBY STANDBY DIESE L GEN 0 1 IIIIIL GEN 01 NORMAL POWE SUBSYSTE 12.47kV MAIN SWGR C 12,47K 2nOOA T T T 4T~ 12;4T 1 6. 4 1200A 4. 1200A 6KV 41 _T REP SITORY BLOCK REPOSITORY RAW WATER SO TH PORT~L NORWL LOADS BLOCK WELL PUMPS NORMAL LOADS 4.16KV SWGR 4.16kv. 2000A .Pigure 2-1 ~iiMplilie(l ~iystem viagram 2-4 June 2004 3. REQUIREMENTS AND BASES All requirements referencing Preliminary N'Uclear Safety Design Basesfor + License Application (BSC 2003c) are classified as 10 CFR Part (53 requirements and are located in + Section 3. 1. 1. 1. The remaining requirements and associated bases are classified as Extemal + Compliance unless noted within the appropriate comment section. 3.1 GENERAL REQUIREMENTS 3.1.1 SYSTEM FUNCTIONAL REQUIREMENTS 3.1.1.1 Safety Requirements Not Applicable - The electrical power system is non-SC. 3.1.1.2 Environmental Requirements No enviromnental requirements for the system have been identified at this stage+ of the design. Enviromnental requirements for the following activities may be developed in the+ future and shall be applied as needed. Land disturbance from transmission line towers Noise and emission controls for the system's diesel generators Requirements for the on-site storage and handling of diesel generator fuel oil There are several enviromnental requirements that limit total site land + disturbance, water usage and air emissions. These have not been subdivided and allocated to individual + facilities or systems; however, it is necessary in the design of each facility or system to + predict the impact of facility/system construction and operation on these elements. A requirement for+ this has been included below: 3.1.1.3 Mission-Critical Requirements 3.1.1.3.1 Requirement: The Yucca Mountain Project (YMP) power systems shall be + divided into switchyard and standby power, norrnal power and emergency power + subsystems. Uninterruptible and DC power sources shall be included for selected power and + control functions. Supports Function 2. 1. 1. Basis: The repository normal, standby and emergency power subsystems were + selected based on NFPA 70. [PDC 4.3.1.1.41 3.1.1.3.2 Requirement: The switchyard located at the southwest comer of the + North Portal facility area shall be used to receive power via 230 kV and 138 kV overhead + transmission lines from the utility power company. Supports Function 2. 1. 1. Basis: This requirement establishes the criteria for utility power supply to + the site and establishes the interface point with the electrical power system. [PDC4.3.3.1] 000-3YD-EEOO-00200-000 REV 002 3-1 June 2004 3.1.1.3.3 Requirement: The 230 kV and 1_38 kV power at the switchyard shall be + stepped down to 12.47 kV by means of a step-down transi"ormer located in the + switchyard. The 230 -12.47 kV step down transfortner shall be the primary main transformer; it shall supply + all facility loads normally. The 138-12.47 kV step down trarisformer shall be the altemate main + transforrner; it shall supply certain facility loads when the primary main transfortner is not + available. Supports Function 2. 1. 1. Basis: This requirement defines the roles of the tmio main step down + transformers and sets priniary site voltage in accordance with good engineering practice. [PDC 4.3.3.3 and PDC 4.3.3.4] 3.1.1.3.4 Requirement: The system design shall provide a 30 percent margin to + accommodate future load growth. Supports Function 2. 1. L Basis: This requirement is needed to ensure that tlle electrical system is + designed with sufficient margin for the future. The value of 30 percent is based on engineering judgment derived from + standard engineering practice regarding system margins. The 30 percent value is applied in addition to the + system loads defmed during the fmal design. [PDC 4.3.1.1.2] 3.1.1.3.5 Requirement: The system shall regulate the utilization voltage to + plus or minus 10 percent. Supports Function 2. 1. 1. Basis: This requirement defmes the capability of the electrical power system to+ supply power for the end item equipment. This voltage drop limit is for normal operations because a momentary+ voltage drop shall occur for the starting of large motors. This value is in line with IEEE Std 141-1993, IEEE + Recommended Practicefor Electrical Power Distribution for Industrial Plants, and ANSI C84.1-1995, Electricalpower + systems and Requirements. [PDC 4.3.1.1.3] 3.1.1.3.6 Requirement: The facility nonnal power supply voltages shall be 12.47+ W, 4.16 W, 480V, for 3-phase and 277 V, 208 V, 120 lvl, for single phase, 60 Hz for AC + system. The allowable frequency variation will be detennined as the design matures. The DC + battery system voltage shall be 125 V. Supports Function 2. 1. 1. Basis: This requirement defines the facility application voltages, per IEEE Std+ 141-1993, IEEE Recommended Practicefor Electrical Power Distribution for Industrial Plants. These voltages+ are most conimonly used in the industry in the United States for medium and low voltage systems. Electrical + equipment is most readily available in these voltages and has proven performance. The specification of system voltages+ that shall be available permits the design of process systems to proceed with certainty with regards to power + supply. The medium voltage 12.47 kV is currently used in the exisfing system at the site, therefore it is selected + over 13.8 kV system for the sake of service continuity. [PDC 4.3.1.1.5] 3.1.1.3.7 Requirement: The facility emergency power supply voltages shall be + 4.16 W, 480V, for 3-phase and 277 V, 208 V, 120 V, for single phase, 60 Hz for AC system. The+ emergency DC battery system voltage shall be 125 V. Supports Function 2.1.3. Basis: This requirement defines the facility application voltages, per IEEE Std+ 141-1993, IEEE Recommended Practicefor Electrical Power Distribution for Industrial Plants. These voltages+ are most commonly used in the industry in the United States for medium and low v(iltage systems. Electrical + equipment is most readily available in these voltages and has proven performance. The specification of system voltages+ that shall be available perrriits the design of process systems to proceed with certainty with regards to power + supply. [PDC 4.3.2. 1] 000-3YD-EEOO-00200-000 REV 002 3-2 June 2004 3.1.1.3.8 Requirement: The standby diesel generators shall be rated 12.47 kV + and the emergency diesel generators shall be rated 4.16 W, 3-phase and 60 Hz, wye + connected. Upon loss of off-site power, the diesel generators shall be automatically started. + Supports Functions 2. 1.1 and 2.1.3. Basis: This requirement defmes optimum system design. The standby power voltage+ requirement is based on mininiizing the impact of the remote locations of the standby loads. Because + the location of "emergency" equipment loads is local to the North Portal, the emergency diesel generator can berated + at a lower voltage. [PDC4.3.1.1.21] 3.1.1.3.9 Requirement: The UPS shall be provided to supply critical power of + acceptable quality, without delay or transient during a power interruption, to important + monitoring and control loads that cannot tolerate a power interruption. The UPS shall also + supply important computer systems. Supports Function 2. 1. 1. Basis: This requirement is in accordance with IEEE Std 446-1995, Emergency and + Standby Power System for Industrial and Commercial Applications. [PDC 4.3.1.1.19] 3.1.1.3.10 Requirement: The UPS system for facility control and instrumentation+ applications shall be supplied by 480 VAC power and the output shall be 208/120 V, 3-phase, + 60 Hz. The UPS battery banks shall be sized to provide full UPS rated load. Supports + Functions 2. 1. 1. Basis: This requirement is required to defme the UPS system voltage. The + selected voltage is most conunonly used in the industry. The minimum continuous UPS operating time is required to + assure nuclear safety for facility operation during a loss of offsite power. The requirement of providing + uninterruptible power is also indicated in NFPA 70, National Electrical Code [PDC 4.3.1.1.20] 3.1.1.3.11 Requirement: The nominal voltage of the DC battery system shall be + 125 VDC. The battery system shall be designed for a long life and low maintenance + requirements. The 480V supply for the battery charger for the DC power system shall be from a motor + control center. Supports Functions 2. 1. 1. Basis: This requirement defines the DC system voltage. The voltage is most + commonly used in the industry. The perfonmnce and reliability are superior. Battery with long life and low + maintenance type shall be required. The niinimum baftery discharge time is required to assure a continuous power supply+ during a loss of offsite power. This is important for a safe facility operation and shutdown by providing sufficient+ backup power. This is in accordance with NFPA 70, National Electrical Code. [PDC 4.3.1.1.18] 3.1.1.4 General Requirements 3.1.1.4.1 Requirement: All facility electrical loads shall be designated as + either group A or group B. Each group receives power from one of two 12.47 kV main switchgears A + and B. The loads shall be distributed, as much as possible, to achieve balance between + groups. Supports Function 2. 1. 1. Basis: This requirement defines the power distribution system structure. This + simplifies the system design, system control, and improves reliability. Division of the loads can also + facilitate maintenance and increase availability of the facility loads. Division of loads is in accordance with + good engineering practices. [PDC 4.3.1.1.71 000-3YD-EEOO-00200-000 REV 002 3-3 June 2004 3.1.1.4.2 Requirement: The switchyard shall be fenced and the access gate shall+ be locked to limit the access to only qualified workers. Supports Function 2. 1. 1. Basis: This criterion is required to protect the safety of non-job-related + personnel, as required in the NFPA 70, National Electrical Code. This is also a common industry pracfice. [PDC + 4.3.3.2] 3.1.2 Subsystem and Major Components System-level requirements for the standby and emergency diesel generators are + described above. 3.1.2.1 Requirement: The norrnal LTPS power to the welding equipment for waste + package closure shall have sufficient capacity to supply power for at least 15 minutes + after loss of norrnal and standby power. Supports Function 2.1.3. Basis: This requirement assures that an in-process waste package can be placed + in a safe condition (welded closed) should a loss of power occur. [Operational Constraint] 3.1.3 Boundaries and Interfaces The requirement for the electrical power system boundary between utility power + and site power is discussed in the system-level requirement for the utility supply and system + power factor. There are no other system boundary requirements that must be accounted for in + the design of the system. The electrical power system interfaces with all facilities and their housed + systems to provide power. The requirements for voltage regulation and supplied voltages are + included in the system-level requirements above. The electrical power system interfaces with the Electrical Power Support + System. The latter system provides requirements for support elements such as grounding, cable + separation, ductbanks and raceways, and lightning protection. The requirements for these + support functions are contained in the Electrical Support System SDD. 3.1.4 Codes, Standards, and Regulations Codes, standards, and regulations that apply to the electrical power system are+ contained in the PDC (Doraswamy 2004) in the following sections. Section 4.3.1 - general design criteria Section 4.3.2 - emergency electrical power design criteria Section 4.3.3 - switchyard and transmission design criteria Section 4.3.4 - normal electrical power design criteria Section 4.9.3.1 - As Low As Reasonably Achievable (ALARA) codes and standards 000-3YD-EEOO-00200-000 REV 002 3-4 June 2004 3.1.5 Operability The electrical power system is highly reliable but is not required to be + operational to mitigate Category 1 or 2 event sequences. Consequently, the electrical power system is + categorized as non-safety category SSC. 3.2 SPECIAL REQUIREMENTS AND BASES Hazard analyses are not yet complete but are assumed to be potentially + applicable. This section will be updated for each hazard with inforrnation on + applicability/non-applicability, mitigating and/or fail safe performance requirements, enviromnents, monitoring, alarms, + and interfaces. See Preliminary Hazards Analysisfor License Application Study (BSC 2004b) for + additional inforrnation. 3.2.1 Radiation and Other Hazards 3.2.1.1 Requirement: The system components shall be hardened or properly + shielded to withstand and operate under the radiation levels in which they are installed + commensurate with the perforrnance basis of the equipment. Supports Function 2. 1. 1. Basis: The requirement ensures that the system components will perform their + intended fimctions. [PDC 4.9.3.5] 3.2.2 ALAIRA 3.2.2.1 Requirement: The electrical power system shall be located and/or + shielded to minimize exposure to meet ALARA principles. Supports Function 2. 1. 1. Basis: This requirement will niininiize personnel exposure. [PDC 4.9.3.3] 3.2.3 Nuclear Criticality Safety 3.2.3.1 Requirement: The electrical power system shall be designed so that it + shall not initiate any credible criticality event. Supports Function 2. 1. 1. Comment: The electrical power system performance requirements shall be + ascertained from the review to prevent the hazards of a criticality event. Basis: Nuclear facility safety standards seek to prevent unplanned nuclear + criticality events and protect workers and environment from potentially hamiful exposures. This requirement will ensure + that this goal is met. [PDC 4.9.2.2. 1 ] 3.2.4 Industrial Hazards No industrial hazards have been identified at this time. As the design matures,+ requirements for addressing industrial hazards shall be established as needed. 3.2.5 Operating Environment and Natural Phenomena 3.2.5.1 Normal Environment 000-3YD-EEOO-00200-000 REV 002 3-5 June 2004 3.2.5.1.1 Requirement: Equipment shall be designed for the applicable + enviromnental conditions. Supports Function 2. 1. 1. Basis: This requirement is based on good engineering practice. [PDC 6. 1. 1 3.2.5.1.2 Requirement: The design of the system shall account for the effects + of the site altitude on equipment perforrnance. Supports Function 2. 1. 1. Basis: This requirement is based on good engineering practice. [Operational + Constraint] 3.2.5.2 Earthquake 3.2.5.2.1 Requirement: All equipment in the emergency power sub-system shall be+ designed for the 1,000 year earthquake. Acceptability of passive equipment such as cable + tray and supports shall be verified by analysis. Acceptability, including operability after an + earthquake, for active equipment such as diesel generators, switchgear, and related power distribution+ equipment shall be verified in accordance with ANSMEEE Std 344-1987, Section 9. Supports + Function 2.1.3. Basis: This requirement is to ensure that the emergency power subsystem is + available after a seismic event. [Preliminary Hazards Analysisfor License Application Study (BSC 2004b)] 3.2.5.3 Tornado, Extreme Winds, Rainstorm 3.2.5.3.1: Requirement: Emergency power equipment shall be designed and/or + protected to maintain operability in the event of a tomado or extreme winds. The emergency + diesel generators shall include provisions that assure that intake air quality is not + compromised by outside ambient conditions, which may arise during nonnal, off-normal, or + emergency conditions caused by rainstorins, high winds, sandstorins, tomadoes or high dust loading. + Supports Function 2.1.3. Basis: This requirement is to ensure that emergency power equipment is + available after a tomado, extreme winds or a rainstorrri. [Preliminary Hazards Analysisfor License Application Study (BSC + 2004b)]. Comment: Volcanic ash fall shall be addressed at a later date as no + inforniation is available to quantify requirements at this time. 3.2.5.4 Flooding 3.2.5.4.1 Requirement: Emergency power equipment shall be installed in a manner+ that will prevent any impact due to flooding. Supports Function 2.1.3. Basis: This requirement is necessary to prevent damage to equipment due to + flooding. (Preliminary Hazards Analysisfor License Application Study (BSC 2004b)] 3.2.5.5 Loss of Offsite Power 3.2.5.5.1 Requirement: The emergency power system shall be designed to be + operable during periods of loss of offsite power. Supports Function 2.1.3. 000-3YD-EEOO-00200-000 REV 002 3-6 June 2004 Basis: This requirement is based on the YMP Hazards Analysis for License + Application, [Preliminary Hazards Analysisfor License Application Study (BSC 2004b)] 3.2.6 Human Interface Requirements The electrical power system is non-SC. Currently, there are no design + requirements for alarms intended to trigger manual safety actions. Therefore there are no human + interface requirements for the system design. As system design evolves and system operations documents+ are developed, design requirements to assure appropriate human interface with the + system may be needed. 3.2.7 Specific Commitments 3.2.7.1 Requirement: The emergency power system shall be designed and operated + to meet pollution prevention and sustainable design and decommissioning goals. Supports+ Function 2.1.3. Basis: The electrical power system shall meet the requirements of pollution + prevention and sustainable design and deconunissioning goals. [PDC 4.2.3.3.8 & PDC + 4.8.4.3.1] 3.2.7.2 Requirement: The repository shall be designed with pollution prevention+ systems to control air emissions and effluents, minimize water use, and reduce or + eliminate discharges to the enviromnent. Supports Function 2. 1. 1. Basis: The design shall coniply with applicable enviromnental requirements set + forth by federal and state regulations, Executive Orders, and DOE Directives, and requirements derived + from enviromnental permits and corresponding permit conditions. [PDC 4.1.1.9] 3.3 ENGINEERING DESIGN REQUIREMENTS AND BASES 3.3.1 Civil and Structural The electrical power system does not currently have any specific civil and + structural requirements. For seismic requirements refer to Section 3.2.5.2. 3.3.2 Mechanical and Materials The switchyard, standby power, and norinal power sub-systems of the electrical + power system are comprised of standard, commercial grade components and no special design + requirements are needed for mechanical or material engineering of these sub-systems. 3.3.3 Chemical and Process There are no chemical and process requirements for the design of the electrical+ power system. 000-3YD-EEOO-00200-000 REV 002 3-7 June 2004 3.3.4 Electrical Power 3.3.4.1 Requirement: All electrical equipment, raceways, and cables of the YMP + Facility shall be given unique identification numbers, except for lightning protection, + cathodic protection, and grounding systems. Furthertnore, parts of the lighting system and heat trace + system shall also take exception to this requirement. Supports Function 2. 1. 1. Basis: This requirement is based on good engineering practice. [PDC 4.3.1.1.8] 3.3.4.2 Requirement: Transfonners shall be liquid-filled for outdoor service + and dry-type for indoor service. Supports Function 2. 1. 1. Basis: This requirement is based on good engineering practice. [PDC 4.3.1.1.9] 3.3.4.3 Requirement: The transfonners for outdoor installation shall be 230 kV + to 12.47 W, 138 kV to 12.47 W, 12.47 kV to 4.16 W, 12.47 kV to 480/277 V, 4.16 kV to + 480/277 V, and 480 V to 208/120 V. The transfonner shall be 3-phase, 60 Hz, with no-load + manually operated taps. The primary side shall be delta connected. The secondary side shall be + wye connected with the neutral resistance-grounded for 4.16 kV secondary and solid grounded for + 480 V secondary. Supports Furiction 2. 1. 1. Basis: This requirement standardizes design for reliable operation. The + transformers with these voltages are most commonly used in the industry. The neutral resistance grounding in the medium + voltage system shall mininiize the fault current for human safety. The solid neutral grounding for low voltage + system will facilitate quick clearing of fault. The delta-wye connection will mininiize grounding fault effects and + mininiize harmonics in the system. [PDC 4.3.1.1.10] 3.3.4.4 Requirement: The medium voltage switchgears shall be rated at 12.47 kV + or 4.16 W, 3- phase, 60 Hz. The switchgears shall be rated to withstand the maximum + short-circuit current available in the system. Supports Function 2. 1. 1. Basis: This requirement defines the system operating voltages to standardize + design. The maximum short-circuit current withstanding capability is required for protection of personnel safety,+ equipment and system protection and is in accordance with standard industrial practice. [PDC4.3.1.1.11] 3.3.4.5 Requirement: Lighting and instrumentation transforiners shall be dry + type (except outdoor application). The primary side shall be delta connected, the secondary + side shall be wye connected and the neutral solidly grounded (secondary voltages shall be 480/277+ V or 208/12OV). Supports Function 2.1.1. Basis: This requirement is based on good engineering practice. It will minimize+ fire hazards by not using oil-filled transformers for indoor application, and niininiize harmonics in the system. + [PDC 4.3.1.1.12] 3.3.4.6 Requirement: 480 V load centers shall be used to provide power to the + downstrearn motor control centers, motors larger than 150 hp up to 300 hp, and static loads+ up to 400 M Supports Function 2. 1. 1. Basis: This requirement is based on standard industry practice. This practice + will niinimize the stress in electrical equipment. This will enhance long-term operation of the equipment. [PDC + 4.3.1.1.13] 000-3YD-EEOO-00200-000 REV 002 3-8 June 2004 3.3.4.7 Requirement: 480 V motor control centers (MCC) shall be used to provide+ AC power to induction motors and other loads rated abovel/3 hp and up to 150 hp, and + miscellaneous branch circuits. Static (resistive) loads up to 240 kW can be served from MCCs. + Supports Function 2.1.1. Basis: This requirement is based on standard industry practice. This practice + will facilitate easy instauation and easy replacement of motors or static loads. [PDC 4.3.1.1.14] 3.3.4.8 Requirement: In general, AC motors shall be squirrel-cage, induction + type, suitable for operation from the following supplies: Motor Size 1/3 hp and smaller 1/2 hp to 300 hp 300 hp to 7,500hp Utilization Voltage 115 V 460 V 4 kV System SUPI 120 V, 1 -phase, 60 Hz 480 V, 3-phase, 60 Hz 4.16 W, 3-phase, 60 Hz Supports Function 2. 1. 1. Basis: This requirement is based on standard industry practice such as + suggested in IEEE Std 141-1993 and ANSI Std C84.1-1995. [PDC 4.3.1.1.15] 3.3.4.9 Requirement: The motors used for outdoor installation or in the hazard + location shall be either totally enclosed fan-cooled (TEFC), totally enclosed non-ventilated + (TENV), or weather- protected, type 11 (WP II). Supports Function 2. 1. 1. Basis: This requirement is required to ensure that the motor is protected from + weather or chen-tical hazards [PDC 4.3.1.1.16] 3.3.4.10 Requirement: Variable speed drive shall be used where it is required + to control speed of the driven mechanical equipment. Supports Function 2. 1. 1. Basis: This requirement is based on good engineering practice. [PDC 4.3.1.1.17] 3.3.4.11 Requirement: The 15 kV and 5 kV power cable shall be single conductor + or triplexed Class B stranded copper conductor, 133 percent insulation level and rated for + continuous operation at 90'C (194'F), 130'C (266'F) for emergency overload operation and + 250'C (482'F) for short circuit conditions. Supports Function 2. 1. 1. Basis: This requirement assures the quality of cables to be satisfactory for + normal and emergency applications. [PDC 4.3.1.3.11 3.3.4.12 Requirement: The power, lighting, motor feeder and control cables + shall be single conductor or multi-conductors, copper, rated 600 V, 75'C (167'F). The conductor+ shall be hard- drawn copper. All power and control wiring shall be standard copper + flarne-retardant moisture and heat-resistant or heat-resistant therinoplastic insulated 75'C (167'F). + Supports Function 2.1.1. Basis: This requirement assures the quality of cables to be satisfactory for + normal and emergency applications. [PDC 4.3.1.3.2] 3.3.4.13 Requirement: Power cables of size #2/0 and larger shall be single + conductor or triplexed. Cables for lighting circuits shall be single conductor, solid + copper. Cable insulation and jacket material shall be resistant to heat, moisture, impact, radiation + (where required) and ozone. Supports Function 2. 1. 1. Basis: This requirement assures the quality of cables to be satisfactory for + normal and emergency applications. [PDC 4.3.1.3.3] 3.3.4.14 Requirement: All lighting and receptacle panel branch circuits shall + have a maximum of three circuits sharing a common neutral for single-phase loads. Where + non-linear loads have been identified, the neutral shall be sized accordingly. Supports Function 2. + 1. 1. Basis: This requirement limits the gound fault current passing through a + neutral conductor, to maintain the integrity of the circuit. This is in accordance with the requirements of NFPA 70, + National Electrical Code Article 250. [PDC 4.3.1.3.4] 3.3.4.15 Requirement: Instrument cables shall be single-pair, triad-twisted and+ shielded, or multi-pair with shielded pair and overall shield with a drain wire, unless + supplied by the instrument vendor. Supports Function 2. 1. 1. Basis: This requirement provides the capability to shield the instrument + signals from noise transmitted on to the cable, in order to prevent instrment malfimction due to the noises in the + instrumentation cable. [PDC 4.3.1.3.5] 3.3.4.16 Requirement: All instrument cable shall be fire-resistant. All + instrument wiring shall be stranded. Fiber optic cable and field-bus shall be used for most data network, + voice and video communication. Supports Function 2. 1. 1. Basis: This requirement assures the satisfactory performance of cables with the+ state-of-the-art technologies. This will ensure integrity of instrumentation system function. [PDC 4.3.1.3.6] 3.3.4.17 Requirement: All cable insulation and jacket material shall be of low + flammability type. Supports Function 2.1 - 1. Basis: This requirement is required to protect cables from failure due to fire + or heat. Cable testing shall be in accordance with IEEE Std 1202-199 1, IEEE Standardfor Flame Testing of + Cablesfor Use in Cable Tray in Industrial and Commercial Occupancies [PDC 4.3.1.3.7] 3.3.4.18 Requirement: Control cables shall be multi-conductor and color coded + in accordance with the standard industrial practices. Supports Function 2. 1. 1. Basis: This requirement is based on standard industrial pracfices and + standards. [PDC 4.3.1.3.9] 3.3.4.19 Requirement: The DC power system shall be used as needed for emergency+ and nortnal power 12.47kV and 4.16kV switchgear control power. Supports Function 2.+ 1. 1. 000-3YD-EEOO-00200-000 REV 002 3-10 June 2004 Basis: This requirement defines the facility medium voltage switchgear control + voltage. The DC power will be available even in a loss of norinal power. This improves the reliability of + circuit breaker control and is in accordance with good engineering practice. LPDC 4.3.1.1.6] 3.3.4.20 Requirement: The 12.47 kV power output from the main transformer shall+ be connected to the 12.47 kV main switchgear buses in the 12.47 kV switchgear + facility via underground duct banks or an overhead non-segregated phase bus. Supports + Function 2. 1.1 Basis: This requirement defines the method of power line connection in + accordance with good engineering practice. [PDC 4.3.3.5] 3.3.5 Instrumentation and Control Instrumentation and control design details for the system shall be established + as the design proceeds. 3.3.6 Computer Hardware and Software There are no computer hardware and software requirements currently established + for the electrical power system. 3.3.7 Fire Protection Fire protection requirements for the design of the system are tied to the + facility that houses the system's components. These requirements are found in one of the site fire + hazards analyses. The fire protection requirements for outdoor oil-filled transforrners, if + needed, will be developed as the design progresses. 3.3.7.1 Requirement: Combustible vegetation shall be kept a minimum of 33 feet + from electrical power system components and structures. Basis: This requirement satisfies the site fire hazards analysis. [Site Fire + Hazard Analysis (BSC 2004a)] 3.4 TESTING AND MAINTENANCE REQUIREMENTS AND BASES 3.4.1 Testability The design requirements for testability of equipment and components shall be + included in this section as the design matures, and as the specification for such equipment and + components are available to the project. 3.4.2 TSR -Required Surveillances This system is non-SC and is not subject to TSR. 000-3YD-EEOO-00200-000 REV 002 3-11 June 2004 3.4.3 Non-TSR Inspections and Testing Non-TSR inspection testing shall be included in this section as the design + matures. This section shall include the required inspection, acceptance criteria, and other features + to facilitate surveillance actions. 3.4.4 Maintenance The electrical power system maintenance activities to comply with the + manufacturer recommendations shall be developed as needed. As the design matures, this + section shall include manufacturer recommendations and periodic maintenance schedules to ensure + continued reliability. 3.5 OTHER REQUIREMENTS AND BASES 3.5.1 Security and Special Nuclear Material (SNM) Protection Security and SNM Protection requirements for the electrical power system design+ shall be developed if required by the results of the vulnerability assessment. However, + due to the sensitivity issues of the subject, a separate SDD shall be issued to the + project and only to personnel with proper clearance. 3.5.2 Special Installation Requirements Special installation requirements for major electrical equipment shall be + included in this section as the design matures, and shall include physical separation requirements, + specific cable usage and routing, proper safety clearances, and maintenance accessibility. 3.5.3 Reliability, Availability, and preferred Failure Modes There are no unique requirements for system reliability or availability. There + are several system mission requirements contained in Section 3.1.1.3, which support system + availability and reliability. These include the use of preferred and altemate utility supplies, + the standby and emergency power subsystems and UPSs. The system is non-SC and therefore does + not have a preferred failure mode. As the design matures, this section shall include + provisions to improve reliability, such as equipment redundancy, diversity, physical separation, + electrical isolation and other features designed for early detection of component failures. 3.5.4 Quality Assurance The electrical power system is non-SC and is not subject to the requirements of+ the quality assurance prograin described in Quality Assurance Requirements and Description + (DOE 2004). 3.5.5 MisceBaneous Requirements There are no miscellaneous requirements at this time. 000-3YD-EEOO-00200-000 REV 002 3-12 June 2004 4. SYSTEM DESCRIPTION 4.1 CONFIGURATION INFORMATION 4.1.1 Description of System, Subsystems, and Major Components 4.1.1.1 Description of the System The electrical power system designed for the repository facility is a reliable + and robust system. The system is designed to regulate utilization voltages between plus and minus + 10 percent (Section 3.1.1.4. 1). As shown in Figure 4-1 the system is designed such that either one of the two + utility power supplies to the two switchgear buses can be selected to supply both buses + through a closed tie circuit breaker. The design for the repository facility provides for a + preferred supply (230 kV transmission line), and an altemate supply (138 kV transmission line) (Section + 3.1.1.3.2). The 230 kV line supplies power to the entire repository's facility through a + step-down transformer to 12.47 kV main switchgear buses through a closed tie circuit breaker. When the + 230 kV line becomes unavailable the facility load will manually be transferred to the 138 + kV line which will power selected loads on the 12.47 kV buses through a step-down transfonner + until such time that the 230 kV line becomes available, at which time the facility load will be + manually transferred back to the 230 kV source. For added system reliability, standby diesel + generators on 12.47 kV main switcligear buses A and B will automatically start and will be available + to supply power to selected loads in case of total loss of both offsite sources 230 kV and 138 W. The electrical power system consists of the following subsystems: • Switchyard and Standby Power Subsystem • Nonnal Power Subsystem • Emergency Power Subsystem (Section 3.1.1.3.1). 000-3YD-EEOO-00200-000 REV 002 4-1 June 2004 WGR FAC. (AREA At 278) XIMR 12 'T 2 MV 1 2 47KV 4iov 1 47- ~.!;6KV -A. A k- c k- CyA 230KV.133kV 12.47KV 4.16 kV 48 OV (FROM 4.16 kVI (F"8012.47kV) SYSTEM PHASORS SOUTH SiGR If-AC-. Z5 Zs A SOUTH PORTAL ... 12.47KV MAIN S M. 1 V! -t2 2 9 12.47KV.200 DA zi- . . .2 'k 0 SA --+ - - S,~XF:fl 06 aMR 06 f MA I XFMR 04 , NVA 12 _r2 IA?-4.1 2 WVA OA/'FA. 6S;C_ .4?-4.16KV 12!W 6KV 412j47- 1 2.4T-4. GKV 6KV 1200A 1200A 4,16kV SWGR H 4,16KV SWGR G Y 4160V. I 200A 4160V.1200A 1200A 1200A 1200A XFMR 83 XFIA 31 j- 225 IKVA 225 KVA F2"KVA 4 60 SOV V 160-480V tTYPI MCC 31 REPOSITORY BLOCK 8 2000A NC 8 _ T 5A XFMR I IC XFMR IIA I ! 1A I MVA I j 4 7- 4T 12 4TKV- 4.16KV 456V 1200A LC IIA (SOUTH PORTAL) 1,16kV SWGR 416OV.IZOOA 1200A ". 1200A RAN WATER WELL J12 WELL 138kV LINE (L INE 8) AL COUPL [NO_"_3 SURGE CAPACITOFt ARRESTER 8 VOLTAGE -C3-, E~ TRANSFORMER 8 A MOTOR OPER TED Q.~' S. 'S DISC Is SF6 POWER CIRCUIT MOTOR OPERATED BREAKER 5 OISC SW 28:31 6017TSAAFA --& OA/FO 65*C ~20 A 138-12.47KV.3pHASE:60HZ 00 ~~q TYP) NO ~ 4000A 2000A 12.47KV MAIN SWGR D 12.47kV.2000A I MVA " WVA 5 2.47KV- f 1 4 7_ i .8OV - 4.;6K; LC 116 266A I SOtJTH PORTAL) Llffd -L 416O V.1200A 1200A 1200A 1200A 1200A RAW WATER WELL R" WATER PUIAPS PUNK J13 WELL jZ.q(hv-VVV za zx 3! T z0q zoli ZW5 gm 4~!& '4 0 00- oo r M~0 1 2 A OSA 1~ I xFMR 09 _t:7XFIMR OS XFMR OT ' rA 2,!":.VA,-.. 6KV -12 4 7- 12!47- 400A 4 16KV ITYPI 12~A 1200A 4~lfikV SWGR U 4.16KV SWGR N ~y 4,16KV SWGR 4160V.1200A 416ov. 1; 00 4160V~1200A IZOOA 1200A 1200A 1200A 1200A XFbiR 30 FWR 11 _L lEkaju + 2W2 "K VA j- 2-2 5- K'V A j- 225 KVA 225 KVA 225 KVA 4160-480V 17 -r -r WaLn I Typ) MCC al MCC 32 REPOSITORY BLOCK 4.16kV SWGR FAC.__ NORTH PORTAL- 1200A 4.16kV SWGR FAC* (AREA # 26A) NORTH PORTAL 3000A 4.16kV SWGR A NO A I kV SWGR B 4.16kV EMER SWGR (AREA a 26A) 416OV.1200A y 416OV.3000A 41GOV.3000A 9 0 8 8 8 8 8 8 i8l 1 18 8 8 8 8 38 8 0 8 8 8 8 T T T T SA SA S:+ SA SA A SA SA SA SA SA SA SA A SA SA SA SA SA + lti~ 11 S S . H. J. -+If-+ ~J. S S S EMERGEN W 0 DIESEL fi x ~x 0 T' N:Y~ i -1- --- T - T--- - I T-i i TI! F-0--t- 1 fi Wi ZT !I~ T-- f it If. _~ + T_! ;i if I.- ftd - I 't I 2MV.D.8PF 'IT!; !] -i LfL A L" ure s Lf-g MLC-s 6 LE ?I& Li ~qj LC OSA z LC 9 is IDTFI I OTF2) CFW) tcHFI (CCCF UNP TeRsus 11 WH I 110 120 210 1 go 240 26A 30B 210 190 110 1 WP.RF, C*'II,) 110 17A 120 120 160 + 178.C.D.E 17F.G.H.J 160 120 120 110 240 WN R 6 4.16kV BUFFER 4.16KV 4.16kV SWGR E I-EA I 21A:,111. IMEW) 3 0 48 1 1 LFF 1 220 25A 25A Figure 4-1 Main Single Line Diagram 12.47kV MAIN SWGR A 12.4?KV.4000A 8 230KV LINE (LINE A, SLIRCE C'L ARRESTER A CAPACITOR --3 VWAG~ --3 TRANSFORWER S.~ MOTOR OPERATEO DISC S" I A SF6 POWER C IRCUIT BREAKER A MOTOR OPERATEID OISC SW 2A 60/75 MVA * Z-e% 12 OA/FOA.65'C 230-12.4?KV.3 PHASE.6OHZ COOOA TYPI MC r~ 4000A 4 0 OOA 11TYPI 8 1200A XFMR 82 225 K" z __1 E8 T T SA I XFNR 13 STEP-UP A 2 F - X MR !V MIIA -480Y -208V i2KV Y%'_~ -. - MULU - XFMR 069 - XFMR t T IS/18 15 UVA '-[-'2 MVA .A,FA:.,.C 2 47- 12.47-4.16KY I 4.i6KV 3000A 8 8 8, 8 8 SA SA SA ~SA A I A J. ~J. iT I T- ---- ti f , LC 02 N LC 1 48 - LC 04 0 (DTFI) (CH F) (FW) J 1 10 190 210 , 4.16kV 0. SWGR F 8 (HEW 1 22 0 4.16KV SWGR FAC' I NT H R6 A I ?OOA 'T A P' T RE W 2 A 4.16kV EMER SWGR 8 416OV.1200A 8 8 4- 4-1 4 T A SA SA S, SA SA iT EMERrENCY IT DIESEL GEN. B ]T 3PH:6OHZ § 2MW O.8PF P 07 DFt 044 MCC N Lr, H MCC T LLD L" CRSS) isF ) [CCCF) (CHF) (FHF ) (DTF21 (DTF I I 308 26A 240 190 210 120 110 A 8 000-3YD-EEOO-00200-000 REV 002 4-2 June 2004 June 2004 4.1.1.2 Description of Switchyard and Standby Power Subsystem The switchyard and standby power subsystem starts with the high voltage + overhead transmission lines entering the facility at 230 kV and 138 kV supplied by the electrical + power utility company, down through their respective main transformers transfon-ning the voltage down + to 12.47 W, and then through the 12.47 kV main switchgear buses for distribution to all + major areas of the repository facility. As shown in Figure 4-2, the 230 kV and 138 kV transmission power lines use + similar components and connections at the switchyard. The switchyard is fenced and has + a locked gate to assure access by authorized personnel only (Section 3.1.1.4.3). Both the 230 kV+ and 138 kV overhead power lines connect to their respective line sides of the motor + disconnect switches and the overhead ground cables connect to the switchyard grounding system. On the + line side connections before the disconnect switches, current and potential transformers + are connected for voltage monitoring and utility metering. Also at this point, lightning + arrestors are installed for protection against lightning strikes. The load side of the disconnect switches + connect to the line side of the high voltage power circuit breakers. From the load side of the + circuit breakers, a second motor disconnect switch is connected for total isolation of the circuit + breaker. From the second disconnect switch, cables connect to the main transformers that are + rated at 230-12.47 kV (138-12.47 W), 3 phase, 60 Hz, oil air/forced air, 65T (149'F). Also at the + saine points, surge arresters are provided for protection against high voltage surges. Adequate + system protection is provided by protective relays, which will trip the high voltage power circuit + breakers and isolate the transmission line circuits under varying electrical fault conditions and + parameters, and also sound alarms locally and in the Central Control Center facility. Inside the switchyard, the 12.47 kV switchgear facility houses the two + switchgear buses rated at 12.47 W. All facility loads are designated as group A or group B loads to + provide for a reasonable balance between groups (Section 3.1.1.4.2). The 12.47 kV switchgear + facility is a temperature controlled enviromnent facility to ensure functionality of + electrical components that are sensitive to extreme temperatures. The 12.47 kV power supply from the + secondary side of each of the main transfortners "A" and "B" is connected to + the 12.47 kV main switchgear "X' and "B" incoming circuit breakers, respectively, by means of + underground duct banks or an overhead non-segregated phase bus (Section 3.3.4.20). Power distribution cable + routing from the 12.47 kV main switchgear buses is by underground duct banks for nearby + facilities in the North Portal, BOP, and to the subsurface entrance. Power distribution is by overhead + transmission lines to distant facilities of the South Portal, South Portal subsurface, ventilation+ shaft areas, and North Construction Portal. The 12.47 kV switchgear bus control power is supplied from+ the DC power system to allow for breaker operation during a "dead-bus" condition + (Section 3.3.4.19). The standby power sub-system provides power to nonnal buses in the event that + the offsite preferred power supply is unavailable. The standby diesel generators are + connected to the 12.47 kV main switchgear buses to supply power to selected loads. Upon receipt of the+ loss of voltage signal, the standby diesel generators start and come up to rated speed and + voltage (Section 3.1.1.3.8). The SDGs will than be available to supply power to selected loads + on the 12.47 kV main switchgear. The standby diesel generator units can be manually started and+ stopped locally or from the Central Control Center Facility. The standby diesel generators are + wye-connected, 000-3YD-EEOO-00200-000 REV 002 4-3 June 2004 high-resistance grounded and rated at 12.47 W, 3-phase, 60 Hz. The 12.47 kV + main switchgear supply the power generated by the standby diesel generators to selected loads. + There are four standby diesel generators, two connected to each 12.47 kV main switchgear bus. + The standby diesel generator units connected to each bus will be started in sequence. After+ the first diesel generator is connected, facility load will be added to the 12.47 kV switchgear + bus to load the connected diesel generator. Each subsequent diesel generator will then be + connected to the 12.47 kV bus through an automatic synchronizing unit to share loading. More facility + load will then be added to the 12.47 kV main switchgear until all of the diesel generators are + connected. 000-3YD-EEOO-00200-000 REV 002 4-4 June 2004 A A 230KV LINE 138KV LINE kERCURY SWITCHING CENTER CANYON SUBSTATION I I c c B 230KV 120V 112 OX 138KV 20V /I 20V 38kV 7T 23okV 2 NOTE 2 V-5 V-3 / V-3 V-3 ~-3 NOTE L.A. L.A. r ---- *- W iH -~v ~- ~H 192KV 120KV A 3 E-1=1- ~u,.Ty A METERING 3 METERING c 200/5A E -- 400/5A c GRO SW A GRD. SW. 8 8 B 12.47KV 4.16KV DISC SW IA~-G DISC. SW. Is I (.N SYSTEM PHASORS TO UTILITY LINE PROTECTIC~W 200A 4 7 52 1.52-01 -T (-45-0~\ A 200/5A( MR :3 DISC sw 2A s N A. 19iKV MAIN FMR -A 60/75 XMVA. Z.8% 463 230- 2.47KV 3 PHIASE 60 HZ OA/FOA. 65 C A . A A 44 9 T NAMW-EPLATE L 471 451 G \(451 11 G-1 TO 12*4 'KV MAIN SWGR. A 'IFISK MA I N BREAK ER 4DOOA 27 -EMO_EE -00101-000 NON SEG VG No Bus 000-3YD-EEOO-00200-000 REV 002 4-5 TO 12 ' 47KV MAIN SWGR A MAIN BREAKER OWG 278-ETM-EENO-00101-000 230 KV SYSTEM June 2004 RES TO UT [L I TY LINE PROTECTION Q?87 6 T T 11 1400/5A( MR ~ DISC SW 28 L MAIN XqMR "0' 60/75 OA 138-12~47KV z," . 3 PHASE 60 HZ OA/FGA- 65'C A NAME(ILATE TO 12 47KV MAIN SWGR. 8 MAIN BREAKER DWG 278-EMO-EENO ......... I 200A 152 -01 -f - I NOTES 1. THE 230 KV LINE IS THE PERFERED POWFR SUPPLY WITH THE 138 kV LINE AS THE ALTERNATE. 2. THE PHASE SEOUENCE OF 230KV AND 130XV SYSTEMS SHALL BE CONFIRM WITH THE UTILITY. i TO 12.47KV MAIN SWGR B IN BREAKER DWG 278"-AEMO-EEAO-00102-000 138KV SYSTEM Figure 4-2. Switchyard Single Lirie Diagrarn 230 kV and 138 kV System June 2004 4.1.1.3 Description of Normal Power Subsystem The norrnal power subsystem starts from the two 12.47 kV main switchgear buses + "A" and "B" in the 12.47 kV switchgear facility. Power distribution from the 12.47 kV main + switchgears "A" and "B" supply the nonnal power to the North Portal facilities, South+ Portal facilities, BOP facilities, North Construction Portal, and the shaft ventilation areas. As + shown in figure 4-1, power from the 12.47 kV switchgear facility is distributed to transformers for + a voltage output of 4.16 kV and 480 V service. The 480 V load center distributes down to the MCC + for further distribution to smaller loads at 277 V, 208 V or 120 V. The 12.47 kV switchgear feeder circuit breakers are stored energy, draw-out + type circuit breakers, rated at 1,200 A. Each feeder breaker has adequate feeder protection + that will trip the breaker on fault current and also send indication or alann to the central + control room monitoring system. The main transfonners and the 12.47 kV main switchgear are also + protected by differential relays that sense an electrical fault in their zone of protection. The 12.47 kV power feeds down to distribution transformers of either 4.16 kV or+ 480 V for smaller load requirements. The 4.16 kV switchgears in the North Portal and + South Portal are designed with a tie-breaker between them, similar to the 12.47 kV switchgear, + as mentioned previously, for reliability and availability of service. The 4.16 kV feeder + circuit breakers are stored energy, drawout type circuit breakers. The protective relays' functions + and monitoring are similar to that of the 12.47 kV switchgear circuit breakers. The 4.16 kV power generally feeds large motor loads or distribution + transfonners for voltage outputs to 480 V system. The 480 V system consists of load centers that feed + the 480 V motor control centers for small motor loads or other distribution and lighting + panels. The 480 V load center also feeds motor loads larger than 150 Hp and up to 300 Hp. The 480 V + MCCs are equipped with molded case circuit breakers, static loads, or removable motor + starters to feed motor circuits. As shown in Figure 4-3, the single line diagram depicts the power distribution + from the North Portal inside the subsurface access main tunnel. There are two pairs of this + power distribution supplies, one pair coming from North Portal, and the other one pair coming from+ the South Portal area. As shown in Figure 4-3, several distribution sets comprised of a + load break switch, transformer, load center, and MCCs, which are located in cutout side portions + of the access main tunnel. Each pair of distribution lines are redundant, so that in case of a + loss of power from load group A supply, each distribution set can be switched over to the load group B. As shown in Figure 4-4, the 125 VDC system consists of a 125 VDC panelboard + powered by 480 VAC from MCC through a rectifier unit and a battery system. The 480 VAC power + cable connects to a circuit breaker at the battery charger/rectifier unit. The + rectifier section transforrns the 480 VAC input to a 125 VDC output to the distribution center. Appropriate + protective relays are used to adequately protect the in the charger/rectifier unit. Measuring and+ indicating instruments are also present for local and/or remote (Central Control Center + Facility) locations. The figure 4-4 also shows a 125 VDC system that is fed from the two separate + groups of power A and B. The configuration has an added feature of providing a backup battery + charger in case of 000-3YD-EEOO-00200-000 REV 002 4-6 June 2004 malfunction in either one of the primary chargers. The function of the battery + charger is to provide the transfonned 125 VDC as well as keeping the set of battery cells + fully charged. (Section 3.1.1.3.11). Figure 4-5 shows the 120 VAC UPS. The UPS inverter unit is supplied from an + emergency 480 VAC MCC, where the rectifier converts the output to 125 VDC for compatibility + with the DC input fi7om a 125 VDC battery. The 125 VDC goes through the inverter for an + output of 120 VAC, which powers the UPS panel. A separate nonnal 480 VAC supply is shown + connected through a voltage regulating transformer (for conditioning the power supply) + and then to the static transfer switch unit of the UPS. The system follows a sequence where at + the failure of the normal 480 VAC power supply, the 125 VDC power takes over and supplies power + (Section 3.1.1.3.11). If the inverter fails, the load is transferred to the altemate 480+ VAC through the static transfer switch. A manual bypass "make before break" switch is+ included in the LTPS system panel to allow maintenance on the LTPS unit without interrupting the + loads on the LTPS distribution panel. The UPS provides uninterruptible power of acceptable quality to important + monitoring and control loads, including important computer systems that cannot tolerate a + power intenuption (Section 3.1.1.3.9). The UPS also supplies important process loads that cannot + tolerate a power inten-uption, such as waste package closure welding units. These units are + guaranteed to receive uninterrupted power for 15 minutes following a loss of norinal and standby + power (Section 3.1.2. 1). The LJPS units located in for the Dry Transfer Facility, the Fuel + Handling Facility, and Canister Handling Facility used to power closure cell welding machines and + miscellaneous loads will be powered from the norinal power sub-system. The UPS units located in the+ Central Control Center Facility used to power digital control and management + inforination system equipment and communication equipment will be power from the emergency power + sub-system. The uninterruptible power supply system includes the following equipment Uninterruptible power supply units for closure cell welding machines, 480 V + input and 480 V output. They are located in Dry Transfer Facility 1, Fuel Handling + Facility, and Canister Handling Facility. Uninterruptible power supply units, for digital control management infonnation + system and other instrumentation radiation monitoring, 480 V input and 208/120 V + output. They are located in the Central Control Center Facility, Dry Transfer Facility 1, + Fuel Handling Facility, and Canister Handling Facility. Uninterruptible power supply units for the Communication System, 480 V input + and 208/120 V output. It is located in the Canister Handling Facility, Central + Control Center Facility, Dry Transfer Facility 1, and Fuel Handling Facility. Uninterruptible power supply units for miscellaneous loads. They are located in+ Dry Transfer Facility 1, Fuel Handling Facility, and Canister Handling Facility. 000-3YD-EEOO-00200-000 REV 002 4-7 June 2004 TO 12-47 KV MAIN SWW A DWG OOO-EIO--EENO-OOIOI-OOO TO 12.47 KV MAIN SVGR 9 DWG 000-EIO-EENO-OOlOi-000 0 0 LOAD BREAK SW N20 LC XFMR N21 12.47 KV-41 SOO KVA )52-N2001 1600AT/-i-0-0-0AT 480 V LC N20 5 2001 5 'o AA 71,M. X T WAA aliOOAT 480 V MCC 8 LOAD BREAK SW N 1 9 ss LC XFMR Ni' to v 12.47 KV-4 5DO KVA N';2 )1 MOX 11 ODoA 80 V LC N19 1 4 T52-14190? BOOAW; /SOOA T 1,'0=.'AF1i00A so v MCC TO 0 0 LOAD BREAK SW NIB ss LC XFkM Mi 0 v 12.47 KV-4 500 KVA 52-NISDI 160OXF-M-0-OU 1 480 V LC MIS T52-141807 J 800AFMONOWAT I T 10560OAT 4 80 V MCC TO 0 0 LOAD BREAK LOAD BREAK _SS SW NII ss sw M16 "A LC XFSM Ni LC XFMR Ni? 00 v 12.47 KV-480 V 12 ' 47 KV-4 500 KVA 500 KVA )52-NI70i )52-M601 1600AF/100OAt T6-0-01-F/71-03DONAT 1 480 V LC NIT IY480 V LC N16 ;-1 7 T52-14ITO7 52-NIS07 )WO-0-AT/0"A )MA-1770"A 1 4" T T WWA 'I'iOOAT ) 1,WAY/'iOOA 480 V MCC 7? 480 V MCC ?6 LOAD BREAK sw No, SSI LC XFMR NWO 12.47 KV-4 500 KVA H "0'0' iOOMA MU7 1 480 V LC NOI I 0FAMWAT '.ZO=.UQI.LOOA 1 1480 V MCC 61 6 6 0 0 LOAD BREAK LOAD BREAK LOADJOREAK SW N02 SW N03 sw N ss ss ss -C- -C- -F- 11 1 LC XFMR 1402 1 LC XFMR N03 - o LC XFkg III v 12 . 47 KV-480 V 12.47 KV-480 V f%-rV, 12.47 XV- 500 KVA 500 KVA SOO KVA T)S2-NO20I ~ k 52-W401 01110.0A 1600AF/IDOOA 1600AF/IOOOAT 419 F2 1 IL 480 V LC M02 480 V LC U03 -1 480 V LC M04 52-NO207 52-.W3O7 5 ol )SROMMASTOW BODOW We 0-0-AT ISiMA /IWOOAT I H ffAll'00.T 1.00"A 'ADOA 1800"A 'I'IOOA 1 1480 V MCC 62 1 1480 V MCC 63 480 V MCC 64 0 0 LOAD BREAK SW NIS ~Ss - %A. LC XFMR NJ so v 12.41? KV-4 SOD KVA 52-NISOI 1-6-0-0 A-F 71-0-0 O-Al IY48D V LC NIS 7 52-MS07 )FUNUMMAT ) HW'1'.LOOAT 1148DV MCC 75 LOAD BREAK SW N05 _SS D4 LC XFMR NO 00 v 2.47 KV-4 500 KVA T ' S2-NOSOI T ly T6-0057 7/1 -00-011 1 480 V LC NOS t 52-HOS07 8 0 0 AT/-a-0-0 7A ISLOMR00A 1 1480 V MCC 65 LOAD eREAK 0 0 SW NOS ss 5 LC XFNR NO 80 v 12.47 KY-4 500 KVA )52-NO601 160OW71-00-07A I' ~480 11 LC NOS 7,7- ' 52-10607 480 v Licc 66 0 0 LOAD BREAK SW H14 -SS -L. i I LC XFMR NI, to v 12.47 KV-41 500 KVA 52-N1401 1600AF/IOOOAT 480 V LC U14 XT IrSZ-NI40 A / 7 A T) OOA /600A 480 V MCC 74 0 0 LOAD BREAK sw N, 3 SS. LC XFMR MI 0 v 12.41 KV-4 500 KVA 552-141301 1600AF/IOOOAT 480 V LC N13 52-MI307 FOMMUM T ) 10A 56LOGAT 400 V MCC 73 0 0 0 LOAD BREAK SW N 12 3 so v 52-NIZOI FSO-PAF/I-OAT 480 V LC N12 7 52-MI207 HUTIIi6 A" 1 1430 V MCC 12 0 0 LOAD BREAK LOAD BREAK SW NOT SW NOS, SS ss LC XFMR NO? w LC XFMR NO$ so v 12.47 KV-480 V e~ 12.47 KV-480 500 KVA 500 KVA 070 52-NOSOI 111 W, 11000 A T T60OAT/ I ODOAT 1 480 V LC NO& _4480 v LC N07 I 7 7 52= 0101 52-*0807 W 7,15OAT IMA ',"iOOA M""OOAT 1 1480 V MCC 67 _I 480 v MCC fie 0 0 LOAD BREAK SW N09 ss %A~Lk.., LC XFMR NO v 2.47 KV-4 .500 KVA T.' T) 2110112111000AT 1 486 V LC NOS i I '.' UP-1 W0 t - ) B Afflh"A 1 1480 V MCC 69 0 0 LOAO 8REAII SS. LC XFIMR I 12.41 LV-d 500 KVA S2-N11 101 iGooAF7roOOAT 1 480 V LC Nil 'I, -NIIO T 0 IWAMOOA r4eo v mc 71 I so v 0 0 LOAD BREAK sw NIO ss jz- LC XFMR NIO 0 v 12.47 KV-480 V 500 KVA 52 1600AF/1000AT 1 480 V LC NIO 52-NIDO? )8-66v-.-F0W H02liDOAT _I 400 v MCC 70 CAD FILE SOOEIOEEN000300 Figure 4-3 Single Line Diagrani Subsurface Power Distribution 000-3YD-EEOO-00200-000 REV 002 4-8 June 2004 LC XFMR NIZ 12.47 XV-480 V 500 KVA June 2004 DCMIS DCMIS F ULT [ GROUNID L M A'L T OU ALARM 125 V BATTERY 30 CELLS 30 CELLS 2 2 Aa- DOI 2A FROM DPO33 480V AC. 3-8 BATTERY CHARGER F 35A (27-)1----4 FROM DP033 480V AC. 3-8 AL BACKUP BATTERY CHARGER 70A A FROM DPO44. 480V 3-0 BATTERY CHARGER 35A RECT IFIER SEC TION FLOAT Y Di POT 2 2 ' 12S V BATTERY DCM IS I ~ 30 CELLS 0-150 V CCC 2 2A ~02J F 2 2A 87 T K~]- 27 -2 -A 2 A DCMIS DCMIS DCMIS T T T IRIUND I DCM I S GROUND FAUL T r- - - 64 FAULT A AL ARM DCMIS- DCM I SI-t ALARM 72-01 72-01, A ocmis I I ) I OOA 100A v 7 7- v ccc ccc ccc v I 10 A 100 mv A 200A A 2 POLE 100 mvi SHUNT ccc I OOA ~C-C ccc 2 2A SHUNT DI D12 D13 13 1 OOA 72 -n INTERLOCK NO) 72 03 NO 17WA 3 INTERLOCK 72-02 IOOA 100A 100A 12S V K DIVIRIBUTION 04 A I in v oc DISTRINITION ms 0 100-AMP BUS 7'2-06 ')72 1 72-05 72-06 72-OT 1 72-08 1 72-09 1 72-10 1 72-07 -08 72-09 72-10 72-04 1 1 30A 1)15A 10A I IOA I)IOA NO IOA 10A 30A 15A I IOA I 10A I)IOA z cr. 0: w < z a. 4 x (L z u w z z 9 D a. A 0 n > z m (L ~d x tA u CDW u u a_ In (L 03: > :3:3 C3 :3 > ui w cc Nd G3 tn co > A cr fr Ln U~ -% 0 n , lnln -C .4 (L Q. (L -cu a. 0. V) 0 0 PANEL D10 (Do 'A V) PANEL D20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Figure 4-4 125 VDC System Single Line Diagram 4-9 June 2004 June 2004 100 AMP BUS I 72 04 )10A - I Nq) 72-05 IOA 0 2 D 0- 0 c' oco 00 L 000-3YD-EEOO-00200-000 REV 002 2 klA POLE EMERGENCY ED-EEUO-BTRYOOOI 4 80V MCC I 812AUTEORCY 60 CELLS - - - - - - - - - - - - CB CB REC.T.1 F,1'1 T INVERTER NC CB TATIC TRANSFER SW ITCH S MAINTENANCE BYPASS SWITCH EMERGENCY UPS UNIT EU-EEUO-UJX0001 AC INPUT RATING: 480 VAC 3 PHASE6UbUHL 3 WIRES: PLUS GR. ND AC OUTPUT RATING 208/120 V AC. 3 ~HASE. 60HZ 4 WIRES PLUS GROUND 60 KVA - - - - - - - - - - - - - NORMAL 48 ov MCC VOLTAGE REGULATING -L TRANSFORMER T ET-EEUO -XFMROOO 0-201111 0 VAC 3 P."SE . IRES. HZ. iO'KVA - - - - - - - - - - - - - - - - - v SYNC 27 ca NC v 27 - - - - -- - - - - - - - - - - - - --------- --- -- ------------------ 150A 20A 1 20A -/-N-L- . 2 /--1 20A -'-, 3 20A 4 /-\ 20A 20A 20A 20A 20A 20A -/ " 9 io /--,- I 20A 20A il 12 1-1_ 20A 20A /-\ 1 3 14 --, 20A 20A -/-, 15 16 /-\ 20A 20A 17 18 /-, 20A 20A -,-\ Jj 20 /-,- 20A 20A -/ '\ 21 22 /-'- 20A 20A JEMERGENCY UPS PANEL S EA-EEUO-PLOO01 /N 1208/120VAC 0 PHASE, 4 WIRE L - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Figure 4-5 Central Control Center Facility, Communication System Emergency LTPS 000-3YD-EEOO-00200-000 REV 002 4-10 June 2004 4.1.1.4 Description of Emergency Power Subsystem The emergency power subsystem supplies loads essential for the safety of human + life, as defined in NFPA 70, Article 700, National Electrical Code, and IEEE Std 446-1995, IEEE Recommended Practicefor Emergency and Standby Power Systemsfor Industrial and Commercial Applications. The loads supplied by the emergency power sub-system + are: post- event monitoring system, communications, egress lighting in defined areas, + limited select heating ventilation air conditioning (HVAC) units, and worker industrial and life + safety systems. The emergency power subsystem is normally fed by the 12.47 kV normal power in + the North Portal area. As shown in Figure 4- 1, the normal 12.47 kV feeds down to two + 12.47 kv/4.16 kV transfonners, which supply nonnal power to the two 4.16 kV emergency switchgear+ buses. The 4.16 kV emergency switchgears feed all the emergency loads. The 4.16 kV + emergency switchgears feed distribution transfonners to the 480 V emergency power system.+ The load centers distribute down to the MCCs for further distribution to smaller loads + at 480/277 V or 208/120 V. The emergency power subsystem DC power is 125 V (Section 3.1.1.3.7). Emergency diesel generators, which start automatically, can supply power to + their connected 4.16 kV emergency switchgear buses (Section 3.1.1.3.8). The emergency diesel + generators are rated at 4.16 W, 3 phase, 60 Hz. The two trains of emergency switchgears are + separated physically (located in separate rooms) and electrically (no electrical + connection) from each other, in compliance with industry standards. Also, the diesel generators are housed + in separate rooms, with fire rated walls between them. The EDGs are connected to the 4.16 kV + emergency switchgear buses. The DC feeds for 4.16 kV switchgear control voltage will + comply with the separation criteria listed above and will be required to meet the requirements + as listed in Section 3.2 of this document. The 125 VDC batteries and chargers used to supply control power for the 4.16 kV+ emergency switchgear buses are also a part of the emergency power sub-system. The + emergency 125 V direct current system, located in the 4.16kV switchgear facility, consists of + 125 V direct current distribution panelboards, 125 V direct cur-rent battery banks, and battery + chargers. The emergency battery charger is fed from 480 V altemating current power source. + The power to the 125 V direct current emergency distribution panelboard is supplied from the 480+ V altemating current motor control center through the emergency battery charger. Relays are + incorporated in the design of the battery charger and panelboard to protect the system. + Measurement and indication instruments, such as voltmeters and ammeters, are also provided for + local monitoring and Central Control Center monitoring. A battery failure, or the 125 V direct + current system failure, is annunciated locally, as well as in the Central Control Center. 4.1.2 Boundaries and Interfaces The electrical power system boundaries start from the fenced switchyard in the + North Portal area, cable connections down to the 12.47 kV switchgear facility inside the perimeter+ fence where the power is distributed from the switchgear circuit breakers to the facilities and+ extending down to the subsurface power distribution system. The boundary includes the right of + way where the overhead transmission lines are routed to the South Portal facilities, cable + routing down to the 000-3YD-EEOO-00200-000 REV 002 4-11 June 2004 subsurface, then up to the cable connections at the ventilation shafts area. In+ each one of the facilities or areas, the end point of the boundary ends at the load side of the+ smallest load that requires electrical power. Also included are the connections at the standby + diesel generators, the normal power UPS, and the norrnal power battery system. The boundaries of the high voltage switchyard start from the 230 kV and 138 kV + transmission lines terrninating at the motor disconnect switch, current transformer, + potential transformers and at the lightning arresters. The boundaries end at the interface point outside + the various facilities. The boundaries of the emergency power system start at the incoming circuit + breaker of the 4.16 kV emergency switchgears down to and including the load centers and then to the+ MCC connections to the smallest loads that require emergency power. This includes + the connections and loads at the UPS, and at the emergency batteries. 4.1.3 Physical Location and Layout Figure 4-6 shows the physical layout of the switchyard, the 4.16 kV switchgear + facility and the diesel generator facilities. The fenced area is located at the southwest comer + of the North Portal facility. West of the 4.16 kV switchgear facility, four standby diesel generators are + located in-line in Standby Diesel Generator facility. East of the 4.16 kV switchgear facility, two+ emergency diesel generators are located in the emergency diesel generator facility, separated by+ a fire-rated wall. The norinal power system physical location is spread throughout the repository + facility. The major components of the normal power are the switchyard, the 12.47 kV + Switchgear facility, and the 4.16 kV Switchgear facility inside the perimeter fence, as shown in Figure + 4-6. The emergency power system physical location is also spread throughout the + repository facility. The major components are shown in Figure 4-6, which are the 4.16 kV emergency + switchgear in the 4.16 kV Switchgear facility and the emergency generator facility, which + houses the two emergency diesel generators. Two emergency switchgears are located in the east half of the 4.16 kV + Switchgear facility. Emergency power supplied to all facilities in the North Portal is run in + underground ductbanks. 000-3YD-EEOO-00200-000 REV 002 4-12 June 2004 12.47KV STANDBY 4.16K V EMERGENCY DIESEL GENERATOR SW I TCHGEAR FACILITY 4.16KV EMERGENCY 4.16KV SWITCHGEAR DIESEL GENERATOR FACILITY - 12.47/4.16KV TRANSFORMER (TYP) 4.16KV SWITCHGEAR FACILITY 12.47KV MAIN SWITCHGEAR OWER TRANSFORMER 30KV-12.47KV POWER TRANSFORMER 138KV-12.47KV SW[TCHYARD 138KV 230KV L INE LINE Figure 4-6 12.47 kV Switchgear facility and Diesel Generators, Layout Diagrairi 4.1.4 Principles of Operation The following section describes the operation of the electrical power system + during a loss-of- offsite power: Upon loss of both the 230 kV and 138kV offsite power sources, the emergency and+ standby diesel generators start automatically. The incoming breaker of the 12.47kV main+ switchgear A will be tripped open and all the loads connected to the two 12.47 kV buses will+ be automatically shed off the buses. After the standby diesel generators have reached their + rated voltages and frequencies, they will be manually connected to their respective 12.47 kV main + switchgear buses. Once the rated voltage is established at the 12.47 kV main switchgear + buses, the Central 000-3YD-EEOO-00200-000 REV 002 4-13 June 2004 Control Center Facility operator will manually reconnect the selected + repository facility loads to their buses. Similarly, the incoming breakers for the 4.16 kV emergency switchgears will be + automatically tripped open and the loads connected to the 4.16 kV emergency switchgear buses + will be automatically shed. Once the emergency diesel generators have reached their + rated voltages and frequencies, each are automatically connected to their respective deenergized + buses. As soon as rated voltage is established at each of the 4.16 kV emergency buses, the loads + will manually be sequenced back onto these buses. hi the event that only the 230 kV line is loss, the same operation will still + be perforrned on the 12.47 kV buses. However, instead of connecting the already running standby + diesel generators onto the 12.47 kV buses, the 138 kV line will be manually connected to the + 12.47 kV buses by manually closing the 138 kV incoming breaker of 12.47 kV main switchgear B. + Once voltage is established on the bus, the Central Control Center Facility operator will + reconnect the selected critical repository facility loads to their buses and the standby diesel + generators will all be shutdown. At this point in time, the emergency diesel generators have been connected to + their respective 4.16 kV emergency buses and already supplying power to the manually sequenced + emergency loads. If the CCCF operator determines that the 138 kV line is stable, the + operator can perforrn the transfer of power from the emergency diesel generators back to the 138 kV + offsite source. Upon return of the 230 kV source, the CCCF operator will manually perforrn a + load shed of the 12.47 kV main switchgear buses in order to reconnect to the 230 kV preferred + power source. 4.1.5 System Reliability Features The electrical power system is very reliable. Two utility feeds (one preferred + and one altemate) are used and either feed can supply both 12.47 kV main switchgear buses for + further distribution to the site. SDGs are available to backup the utility feeds and are available + to support selected loads. EDGs are also provided for the emergency power subsystem loads and are + available to support selected loads. Furthertnore, uninterruptible power supplies with + battery backups are also used to power selected loads. System reliability is further enhanced by double-end configurations for + selected medium and low voltage switchgear. 4.1.6 System Control Features System control features are not available at this stage of the design. 4.2 OPERATIONS 4.2.1 Initial Configuration (Prestartup) Operating procedures for this system have not been developed. 000-3YD-EEOO-00200-000 REV 002 4-14 June 2004 4.2.2 System Startup Operating procedures for this system have not been developed. 4.2.3 Normal Operations Operating procedures for this system have not been developed. 4.2.4 Off-Normal Operations Operating procedures for this system have not been developed. 4.2.5 System Shutdown Operating procedures for this system have not been developed. 4.2.6 Safety Management Programs and Administrative Controls The electrical power system has been subjected to a hazards analysis under the + ISM program. Design requirements that satisfy the results of this analysis are included in + Section 3. 4.3 TESTING AND MAINTENANCE 4.3.1 Temporary Configurations There are no temporary configurations cuffently identified for this system. 4.3.2 TSR-Required Surveillances The electrical power system is non-SC and not subject to TSRs. No TSR-required + surveillances are needed for this system. 4.3.3 Non-TSR Inspections, and Testing The electrical power system contains standard commercial components. These do + not require special non-TSR inspections and testing. A test program for the system will be + developed using manufacturer reconimendations as guidance. 4.3.4 Maintenance Planned maintenance activities (predictive and preventive) for this system have+ not yet been developed. Manufacturer recommendations will be used as guidance for the + preparation of maintenance procedures and the schedule for planned maintenance activities. 000-3YD-EEOO-00200-000 REV 002 4-15 June 2004 5. REFERENCES 5.1 DOCUMENTS CITED BSC (Bechtel SAIC Company) 2003a. Q-List. TDR-MGR-RL-000005 REV 00. Las Vegas, Nevada: Bechtel SAIC Company. ACC: DOC.20030930.0002 (DIRS 165179) BSC (Bechtel SAIC Company) 2004c. Safety Classification ofSSCs and Barriers. + CAL-MGR- RL-000001 REV OOB. Las Vegas, Nevada: Bechtel SAIC Company. ACC: + DOC.20040615.0008 (DIRS 169971) BSC (Bechtel SAIC Company) 2003c. Preliminary Nuclear Safety Design Basesfor + License Application. TDR-MGR-RL-000006 REV 00. Las Vegas, Nevada: Bechtel SAIC Company. ACC: DOC.20030930.0008 (DIRS 165182) Siddoway, D.W. 2003. Project Functional and Operational Requirements. + TDR-MGR-ME- 000003 REV 01. Las Vegas, Nevada: Bechtel SAIC Company. ACC: ENG.20030630.0001. (DIRS 163904) BSC (Bechtel SAIC Company) 2004a. Site Fire Hazards Analysis. + 000-30R-PFOO-00100-000 REV OOA. Las Vegas, Nevada: Bechtel SAIC Company. ACC: ENG.20040305.0014. (DIRS 168149) BSC (Bechtel SAIC Company) 2004b. Preliminary Hazards Analysisfor License + Application Study. 000-30R-HPYK-00100-000-OOA. Las Vegas, Nevada: Bechtel SAIC Company. + ACC: ENG.20040610.0002. (DIRS 167313) Canori, G.F. and Leitner, M.M. 2003. Project Requirements Document. TER-MGR-MD- 000001 REV 02. Las Vegas, Nevada: Bechtel SAIC Company. ACC: DOC.20031222.0006. (DIRS 166275) Doraswamy, N. 2004. "Preliminary Draft Input Version of Project Design + Criteria Document." Interoffice memorandum from N. Doraswamy (BSC) to Distribution, May 26, 2004, 0526041747, with attachment. ACC: MOL.20040526.0027. TBV-5850 (DIRS 169548) LP-3.26Q-BSC, Rev. 1, ICN 4. System Description Documents. Washington, D.C.: + U.S. Department of Energy, Office of Civilian Radioactive Waste Management. ACC: DOC.20040520.0006. (DIRS 169513) 5.2 CODES, STANDARDS, REGULATIONS, AND PROCEDURES DOE (U.S. Department of Energy) 2004. Quality Assurance Requirements and + Description. DOE/RW-0333P,Rev.14. Washington, D.C.: U.S. DepartTnent of Energy, Office of + Civilian Radioactive Waste Management. ACC: DOC.20040331.0004(DIRS168669) 000-3YD-EEOO-00200-000 REV 002 5-1 June 2004 DOE-STD-3024-98. 1998. Content of System Desip Descriptions. Washington, D.C.: + U.S. Department of Energy. TIC: 254659 (DIRS 164472) IEEE Std 141-1993. 1994. IEEE Recommended Practicefor Electrical Power + Distribution for Industrial Plants. New York, New York: The Institute of Electrical and + Electronics Engineers. TIC: 240362. (DIRS 122242). IEEE Std 446-1995. 1995. IEEE Recommended Practicefor Emergency and Standby + Power Systemsfor Industrial and Commercial Applications. New York, New York: + Institute of Electrical and Electronics Engineers. TIC: 242952. (DIRS 125763) IEEE Std 1202-1991. IEEE Standardfor Flame Testing of Cablesfor Use in Cable + Tray in Industrial and Commercial Occupancies. New York, New York: Institute of + Electrical and Electronics Engineers. TIC: 253647. (DIRS 160800) ANSI/IEEE Std 344-1987 (Reaffirrned 1993). IEEE Recommended Practicefor Seismic Qualification of Class IE Equipmentfor Nuclear Power Generating Stations. New + York, New York: American National Standards Institute. TIC: 253538. (DIRS 159619) ANSI C84.1-1995. 1995. Electric Power Systems and Equipment - Voltage Ratings + (60 Hz). Rosslyn, Virginia: National Electrical Manufacturers Association. TIC: 242358 + (DIRS 126007) NFPA 70. 2002. National Electrical Code. 2002 Edition. Quincy, Massachusetts: + National Fire Protection Association. TIC: 252084. (DIRS 157764) 10 CFR 63. Energy: Disposal of High-Level Radioactive Wastes in a Geologic + Repository at Yucca Mountain, Nevada. Readily available. (DIRS 156605) 5.3 DATA TRACKING NUMBER No source data are cited in this document. 5.4 SOFrWARE CODES No software codes are cited in this document. 000-3YD-EEOO-00200-000 REV 002 5-2 June 2004 APPENDIX A GLOSSARY 000-3YD-EEOO-00200-000 REV 002 A-1 June 2004 APPENDIX A GLOSSARY Basis Statements that refer to design requirements for SSCs and identify why the requirement exists, why it is specified in a particular manner, and why a specified value is used. The design bases provide inforination that identifies the specific functions performed by the SSCs of a facility and the specified range of values chosen for controlling the parameters that are the referenced boundaries for the design of the SSCs. Function A fimction is the statement of the purpose of a system or component. Perfon-nance Acceptance Criteria Performance acceptance criteria are statements+ that provide the verifiable measures of how well the design specification has been achieved. Requirement A specification of what the design solution must do. Requirement statements should also include a statement of how well the specification is to be achieved so as to permit verification. In some cases, there are several different criteria for measuring the success of the achievement of the specification and these would be listed as performance acceptance criteria. 000-3YD-EEOO-00200-000 REV 002 A-2 June 2004 APPENDIX B LIST OF KEY SYSTEM CHARTS, DIAGRAMS, DRAWINGS, AND LISTS 000-3YD-EEOO-00200-000 REV 002 B-1 June 2004 Appendix B The following drawings contain preliminary details on the electrical power + distribution system. As always, consult the most recently approved drawing revision, which can be + located through the document control system. 000-ElO-EENO-000101-000, Facility Electrical Power Distribution Single Line 100-E20-EEOO-000101-000, Electrical Power Area Distribution System Equipment Plan 240-ElO-EEUO-000101-000, Central CTRL Center Facility Single Line Diagram Communication System, Emergency UPS 26B-E50-EEYO-000201-000, Standby Diesel Generator Logic Diagram SDG- 01 & SDG-02 26C-E50-EEGO-000101-000, Emergency Diesel Generators Logic Diagram EDGA & EDGB 270-E50-EEYO-000101-000, Electrical Power Distribution Logic Diagram 27A-ElO-EECO-000201-000, 27A-EZO-EETO-000101-000, Switchyard Switchgear Bldg Single Line Diagram 125 V DC System Switchyard Overall Equipment Layout 230 KV and 138 KV 000-3YD-EEOO-00200-000 REV 002 B-2 June 2004 APPENDIX C LIST OF SYSTEM PROCEDURES 000-3YD-EEOO-00200-000 REV 002 C-1 June 2004 Electrical Power System Descripfion Document Appendix C At this time, there is no list of system procedures. 000-3YD-EEOO-00200-000 REV 002 C-2 June 2004