Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
ACCESSION #: 9807170287
Reportability Requirement
This is Mark Kelly from American Electric Power, D.C. Cook Units 1 and 2,
calling with an initial NRC notification that event number 34427,
previously reported by D. C. Cook on June 23, 1998, has been determined to
also be reportable under 10 CFR Part 21.
The component supplier (Westinghouse) has been provided a copy of this
report. A written 10 CFR Part 21 report will be submitted by August 10,
1998.
*** THE FOLLOWING WAS REPORTED ON JUNE 23, 1998 AS EVENT #34427 ***
Background
The ice condenser consists of 24 bays, each of which contain 81 ice baskets
for a total of 1,944 ice baskets per unit. The ice baskets are
approximately 48 feet high and 1 foot in diameter, and are restrained so
that they do not eject during design basis accident blowdown forces. This
restraint is achieved by a u-bolt arrangement connected to a Cross bar on
the bottom of the ice basket.
On January 12, 1998, an ENS call was made by D.C. Cook to report damage to
ice condenser baskets. More detail on the ice condenser damage was
provided in LER 98-08-01. Today's report is related to manufacturing
defects rather than damage.
Event
Defective and missing welds have been found on the ice basket bottom cross
bar and bottom basket grids during an inspection of the unit I ice
condenser. Although preliminary analyses have indicated that the presence
of defective welds on the bottom cross bar may be acceptable, The aggregate
effect of missing with defective welds on both the bottom cross bar and
bottom grid structure has been determined to constitute an unanalyzed
condition. It is expected that similar conditions will be found in the
unit 2 ice condenser ice baskets.
Corrective Action
The investigation of this condition is ongoing. The defective ice basket
bottom rims will be replaced or repaired as appropriate. A written 10 CFR
Part 21 update will be submitted within 30 days.
POWER REACTOR EVENT NUMBER: 34427
FACILITY: COOK REGION: 3 NOTIFICATION DATE: 06/23/98
UNIT: [1] [2] [ ] STATE: MI NOTIFICATION TIME: 10:19 [ET]
RX TYPE: [1] W-4-LP, [2] W-4-LP EVENT DATE: 06/23/98
EVENT TIME: 08:07 [EDT]
NRC NOTIFIED BY: MARK KELLY LAST UPDATE DATE: 07/10/98
HQ OPS OFFICER: FANGIE JONES
NOTIFICATIONS
EMERGENCY CLASS: NOT APPLICABLE
10 CFR SECTION: MIKE JORDAN RDO
ADAS 50.72(b)(2)(i) DEG/UNANALYZED COND
CCCC 21.21 UNSPECIFIED PARAGRAPH VERN HODGE NRR
UNIT SCRAM CODE IRX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE
1 N N 0 COLD SHUTDOWN 0 COLD SHUTDOWN
2 N N 0 COLD SHUTDOWN 0 COLD SHUTDOWN
EVENT TEXT
ICE CONDENSER BASKETS FOUND IN UNANALYZED CONDITION
THE LICENSEE DISCOVERED, DURING AN INSPECTION OF UNIT ONE ICE CONDENSER,
MISSING AND OR DEFECTIVE WELDS ON THE BOTTOM CROSSBAR AND BOTTOM BASKET
GRIDS OF THE ICE CONDENSER BASKETS. THE LICENSEE EXPECTS TO FIND SIMILAR
CONDITIONS IN THE UNIT TWO ICE CONDENSER. THIS CONDITION IS UNANALYZED AND
AN INVESTIGATION WILL CONTINUE INTO THE CAUSE OF THESE CONDITIONS. THE
CONDITION IS BEING REVIEWED FOR REPORTABILITY UNDER 10CFR PART 21.
THE DEFECTIVE ICE BASKET BOTTOM RIMS WILL BE REPAIRED OR REPLACED AS
APPROPRIATE BEFORE ENTERING PLANT STARTUP.
THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR.
*** UPDATE ON 7/10/98 @ 1704 BY KELLY TO GOULD ***
THE LICENSEE IS CONSIDERING THIS CONDITION TO BE A PART 21 REPORT SINCE
THEY DETERMINED THE REPORTED ICE CONDENSER DAMAGE IS MORE OF A
MANUFACTURING DEFECT THAN DAMAGE. IT IS EXPECTED THAT SIMILAR CONDITIONS
WILL BE FOUND ON UNIT 2.
THE RESIDENT INSPECTOR WAS INFORMED.
THE REG 3 RDO (GARDNER) WAS NOTIFIED.
VERN HODGE (NRR) WAS NOTIFIED.
*** END OF DOCUMENT ***
