ML18348A278

License Event Report 1976-017-00 Re Failure of RPS Matrix Relays

ML18348A278
Person / Time
Site:	Palisades
Issue date:	09/22/1976
From:	Bixel D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-017-00
Download: ML18348A278 (2)

Text

consumers

• • Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 September 22, 1976 Mr James G. Keppler Office of Inspection & Enforcement Region III' US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKEI' 50-255, LICENSE DPR PALISADES PLANT ~ ER-76 RPS MATRIX RELAYS The attached event report relates to a failure of an RPS Matrix relay at the Palisades Plant. This type of failure is reportable on a thirty-day basis but the report was inadvertently misplaced. The discovery of this omission was the result of the recent emphasis being placed on event reports and an extensive search for this event report which was mislaid during the plant review process.

In an effort to resolve this problem, the plant staff has instituted a formal method of maintaining control of all Palisades Plant event report.s. This method of control will be maintained until the Company computerized status system proves capable of performing this function.

As mentioned in the report, a testing program involving the selection of a re-placement relay is nearing completion. We have performed a series of tests on five different relays that were ordered to specification equivalent to the ex-isting relays ..

• These relays (all dry contact type) have been subjected to a series of tests including surge current, seismic, operating time, etc. Pre-liminary results lead us to conclude that an acceptable replacement relay will be found.

David A. Bixel Assistant Nuclear Licensing Administrator SEP 2 7 1976

e LICENSEE EVENT REPORT

• Palisades CONTROL BLOCK: ... I __....I __.___..__.I [PLEASE PRINT ALL REQUIRED INFORMATION]

1 6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE 01 IMIIIPIAILlll 10101-1°101°1°1°1-1°1°1 14111111111 I0 I3 I 7 8 9 14 15 25 26 30 31 32 REPORT REPORT

• TYPE SOURCE DOCKl;T NUMBER EVENT OATE REPORT OATE 7

@E]coN'T 8

1 I I 57 58 w59 L1J

.60 lol51ol-101215151 61 BB lo l5l 2IOl716 69 74 I 1°191 2 12 17161 75 80 EVENT DESCRIPTION lol2l !During routine testing it was found that one of the twenty-four.RPS Matrix relays I 7 89 00 lolsj I failed to operate. Light tapping of the relay case appears to have resolved the I 7 89 00 lol41 I problem.* Weekly testing of the relays has continued with no further problems I 7 8 9 80 lol51 I observed to date. I 7 89 00 jol6I ~'------------------------------------------~(_ER_-~7_6-_1~7~)__________~1 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COMPONENT.

SUPPLIER MANUFACTURER w

. COOE COOE COMPONENT COOE VIOLATIJN

@0 lrf Al 8 9 10 lliJ 11 IRfEILfA(Ylxl 12 17 43 IA I 0 I 5 (5 I 44 47 L!J 7 48 CA!JSE DESCRIPTION fol0I I The cause of this failure appears to be associat~d with the mercury wetted I 7 8 9 80

• lolsl I contacts . (ADLAKE Mod MW-2621-609) and is similar to that reported previously I

~ j (UE-74-1).

80 8 9 A selected group of replacement relays is currently being tested. I FACILITY (Contd Line 18) 80 METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EEiEl 7 9 illJ I 0 I 5 I 0 I -'__NA_ _____.I l1LJ 10 12 13 44 45 46 NA 80 FORM OF ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE EEl ~ W I. . .___N_A_ _ ___,I I NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

[ill I ol o Io I * ~ NA 7 8 9 11 12 13 80 PERS.ONNEL INJURIES NUMBER DESCRIPTION

[EJ I 01 o I oI NA 7 8 9 11 12 80

. PROBABLE C-ONSEQUENCES EJfil I None. The system is designed to perform its function with a failure of this type. I 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION ITfil uJ 7 8 9 10 NA 80 PUBLICITY ADDITIONAL FACTORS

• I A report on the results of these tests will be completed within the next few weeks. I 7 89 00 ITJfil I Resolution of the problem is expected to begin following review of the report.

7 89 80