ML19257C404
| ML19257C404 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 01/17/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8001290065 | |
| Download: ML19257C404 (1) | |
Text
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January 17, 1980 Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. P11 ant, Director Licensing & Quality Assurance Post Office Box 499 Columbus, Nebraska 68601 Gentlenen:
The enclosed IE Circular No. 80-01 is forwarded to you for infornation and, if applicable, necessary action in accordance to the attached General Electric Company Service Advice 721-161.2.
No written respcnse to this Circular is required.
If you have any questions related to the subject, please contact this office.
Sinc.erely,,
/
/
y D,
f L' h (,
Karl V. Seyfrit
/
Director
/
Enclosures:
1.
IE Circular No. 80-01 2.
List of IE Circulars Recently Issued cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Sox 98 3rownville, Nebraska 68321 18f6040 8 0012 90 O O
UNITED STATES SSINS No.:
6830 NUCLEAR RZGULATORY COMMISSION Accessions No.:
OFFICE OF INSPECTION ANC ENFORCEMENT 7912190644 WASHINGTON, D.C.
20555 IE Circular No. 80-01 January 17, 1980 Page 1 of 1 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 va'.ues 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 r. umber 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 combinatio s 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 cont NRC Regional Office.
DUPLICATE DOCUMENT
Attachment:
Enclosure A Entire document previously entered into system under:
ANO No. of pages:
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