ML19257C405
| ML19257C405 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 01/17/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8001290067 | |
| Download: ML19257C405 (1) | |
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u _;..c :.. -.<,.s STATE January 17, 1980 Docket No.
50-285 Omaha Public Power District ATTN:
W. C. Jones, Division Manager -
Production Operations 1623 Earney Street Omaha, Nebraska 68102 Gentle =en:
The enclosed IE Circular No. 80-01 is forwarded to you for information and, if applicable, necessary action in accordance to the attached General Electric Company 3ervice Advice 721-162.2.
No written response to this Circular is require 1.
If 7ou have any questions related to the subj er.t,
please contact this office.
Sincerely,
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Karl V. Seyfrit-Director
Enclosures:
1.
IE Circular No. 80-01 2.
List of IE Circulars Recently Issued cc:
S. C. S tevens, Manager Fort Calhoun Station Post Office Box 98 Fort Calhoun, Nebraska 68102 hk 8 0012900b7
UNITED STATES SSINS No.:
6830 NUCLEAR REGULATORY COMMISSION Accessions No.:
OFFICE OF INSPECTION AND ENFORCEMENT 7912190644 WASHINGTON, D.C.
20555 IE Circular No. 80-01 January 17, 1980 Page 1 of I 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 temper-ature 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 a 3/4" x 3/8" sticker affixed to the relay cradle) has a number less than 50, followed by any of the following two 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.
isttachment:
DUPLICATE DOCUMENT Enclosure A Entire document previously entered into system under:
ANO C
No. of pages: