Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
SSINS No.: 6830
Accession No.:
7912190644
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555
January 17, 1980
IE Circular No. 80-01
SERVICE ADVICE FOR GENERAL ELECTRIC INDUCTION DISC RELAYS
Alabama Power Company reported to the NRC on October 16, 1979 a potential
problem with certain General Electric Company induction disc type protective
relays. A higher than normal pick-up value was caused by petroleum jelly
lubricant which under high temperature conditions can migrate to the
backstop. At room temperature the lubricant can become adhesive and cause
pickup values to be higher than setpoint values.
General Electric (GE) laboratory confirmed some higher than normal pickup
values and recommended that users determine whether relays meeting the
following criteria are in use at their facilities.
(1) Relay type: IAC, IAV, ICR, or IJCV, AND
(2) The relay date code (which is printed on 3/4" x 3/8" sticker affixed
to the relay cradle) has a number less than 50, followed by any of the
following tow letter codes:
(a) Any first letter followed by H, J, K,L, or M; or
(b) The letter combinations AN, BN, CN, DN, EN, DG, EG, FG, GG, HG,
JG, KG, LG, or MG.
For example, 31GK would be considered, while 50 GK or 23HN would not
be considered.
Experience has shown that the cleaning procedure recommended in GE Service
Advice 721-162.1 may not in all cases remove all of the petroleum jelly
which is lodged in place.
Based on the above, licensees are advised to apply G.E. Service Advice 721-
162.2 (Enclosure A) to all relays that fall within the above two criteria.
No written response to this Circular is required. If you desire additional
information regarding this matter contact the Director of the appropriate
NRC Regional Office.
Attachment:
Enclosure A
