ML20059H539
| ML20059H539 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 09/10/1990 |
| From: | Labruna S Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLR-N91658, NUDOCS 9009180046 | |
| Download: ML20059H539 (6) | |
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Nbhe Service
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Electric ar,d GM Company s
Stanley ta8runa Pubhc Service Electric and Gas' Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-4800 vu em nm oco.i.
SEP 101NO NLR-N90158 i
United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-Gentlemen:
BAILEY SOLID STATE LOGIC MODULES.
RELIABILITY PROGRAM DOCKET NO.-50-354 HOPE CREEK GENERATING STATION To satisfy a license condition, Public Service Electric and Gas Company (PSE&G) submitted, in 1988, reliability data for the Bailey Solid State Logic Modules (SSLMs) in use-at our Hope Creek Generating Station (HCGS).
Earlier this year,Las a' courtesy,
}
additional reliability figures were forwarded.
Our most recent-data, provided in Attachment 1, demonstrates a 12-month-averaged reliability for che period ending'in. June,_
1990, that surpasses the IEEE performance. standard'for comparable devices.
These significantly improved reliabil'ity statistics _are
~
'the result of an aggressive program that has addressed and corrected the root causes.of'those' failures that have occurred.
-The program has included:-the enhancement of' environmental conditions in which the devices operate, upgraded receipt, l
handling, and testing techniques for the modules, and l
modification of the tracking methodology used for the SSLMs.
E The improvements made in temperature and humidity control have l'
been incorporated as permanent changes to appropriate'HVAC l
systems.
The upgraded techniques have been proceduralized, and the reliability tracking. program, implemented by the HCGS System Enginners, Will not be terminated even though-SSLM reliability remains acceptable; we are committed to a continuous program for the life of the plant.
The results of the tracking program are periodically reported to the Station Operations Review Committee (SORC) and are available to the USNRC Resident Inspectors at all times; however, we will, as a courtesy,-provide quarterly summaries of the SSLM data to.
NRC staff for the next four quarters, ending June, 1991.
9009180046 900910 PDR ADOCK 05000354 a
P PDC 7
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SEP 101H0 NLR+N90158 Should, as we anticipate, those summaries demonstrate continuedt
-acceptable SSLM operational performance,-PSE&G believes that this information, along with-the data attached.(totaling two years of Bailey SSLM operation with failure rates:below the referenced IEEE standard), will provide a sufficient basis;for.the closure =
of.this NRC concern.
Should you have any further questions, we will:be' pleased to!
-l discuss them with you.
-l 1
--Sincerely, i
C Mr. C. Y. Shiraki USNRC Licensing Project Manager
=i Mr. T.
P. Johnson USNRC Senior Resident. Inspector Mr. T. T. Martin, Administrator USNRC Region I Mr. K. Tosch, Chief Bureau of Nuclear Engineering New Jersey Department of Environmental Protection
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$O 1-ATTACHMENT 1 1
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j BAILEY SSIM REPORT I
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A.
SUMMARY
OF' FAILURES BY MONTH.DURING REPORT PERIOD APRIL 1990 i
1) 04/02/90 1BC652 SLOT-8-9 0-0222 N-1446 INPUT / OUTPUT BUFFER #3,4-FAILED
, CONFIRMED FAILURE W.O.
900314131 PROBLEM:'. DUAL' VALVE-POSITION INDICATION-AT MCR FOR' 1BDNV-F031-E51, RCIC PUMP SUCTION.FROM SUPPRESSION POOL.
2) 04/02/90 1BC653' SLOT 5-3-5 C-1165'
-N-1302 INPUT BUFFER #1 GROUNDED CONFIRMED FAILURE PROBLEM:
MOTOR MALFUNCTION DETECTOR CARD (N-1E), #1 INPUT BUFFER. FAILED.FOR BP102,~ PRIMARY CONDENSATE PMP.
- 3)~
04/06/90 1AC652 SLOT 1-4-12 0-2503 N-1555 FAILED LOGIC VERIFICATION' CONFIRMED FAILURE PROBLEM:
CIRCUIT BREAKER MALFUNCTION DETECTOR-CARD (1E) LOGIC CARD FAILED FOR 4.16 KV-SUBSTATION CIRCUIT BRKR 1 52-40110.
4) 04/06/90 1DC652 SLOT 8-4-15 0-2566 N-1033 T/S-CARD REPLACEMENT ONLY NOT A FAILURE l
W.O.
900420100 PROBLEM:
1D-P-210, RX BLDG SACS PUMP 5) 04/10/90 1BC652 SLOT 4-9-11 0-0354 N-1554 OUTPUT BUFFER #8 INTERMITTENT UNCONFIRMED FAILURE W.O.
900405130 PROBLEM:
1A-P-414, TSC CHILLED.WTR PMP TRIPPING ON LOW FLOW.
TOTAL MONTELY FAILURE a 3 88LM'S; 190( 1990 1
1) 05/14/90 1AC652 SICT 5-4-15 0-1695 N-1226 T/S-PROBLEM ON COM MOD ERROR RESET NOT A FAILURE W.O.
900510093 PROBLEM:
CRIDS POINT D3857 DID NOT ALARM WITH HI-HI SERVICE WATER STRAINER DP, 1EAPDSHH-2196A.
2) 05/31/90 1BC652 SLOT 5-6-8 O-0519 N-0532 OUTPUT BUFFER #1 FAILED CONFIRMED FAILURE W.O.
900529052 PROBLEM:
MS-2357B-1 FOR 1EAHV2357B, SERVICE WATER LOOP B TO COOLING TOWER, OPEN LAMP INDICATION AT MCR FAILED.
TOTAL MONTHLY FAILURES = 1 88LM
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211HE 1210.
1) 06/04/90 1CC652 SLOT 5-8-2, 0-0569 N-1898 INPUT BUFFER #6 FAILED HIGH CONFIRMED FAILURE j
W.O.
901015024 j
PROBLEM -
RHR PUMP ROOM 4114 FIh0D ALARM, 1BCLSH-4403C1,-
1 FAILED TO OPERATE UNDER TEST.
TOT.S.L MONTELY FAILURES a 1 88LM~
TOTAL QUARTERLY FAILURES a 5 SSLM'8
-l B.
FAILURE RATE DATA 1) 23 CONFIRMED FAILURES FROM JUN-1989 THRU JUN 1990.-
l 2) 2278 SSLM POPULATION i
3)
ANNUAL FAILURE RATE PERCENTAGE:
a.
23 + 2278 = 0.01009 x 100 = 1.01 %
.=
'l 4)
MEAN TIME BETWEEN FAILURES DETERMINATION:
MTBF FROM JUN-1989 THRU JUN 1990.
i a.
12 MONTH-SERVICE. HOURS = 8760 HOURS b.
TOTAL MODULE SERVICE HOURS 8760 x 2278 = 19.95'x 106 1
19.95 x 106 + 23 FAILURES = 867,620 HOURS.
c.
23 + 19.95 x 106 = 1.15' FAILURES PER MILLION
' HOURS FAILURE RATE.
C.
COMPARISON STANDARD 1)
IEEE 102 STANDARD EXPECTED FAILURE RATE OF SOLID STATE COMPUTATION DEVICES-IS EQUAL TO 1.19 FAILURES
~REE MILLION HOURS FAILURE RATE.
2)
HCGS BAILEY 162 SSLH FAILURE RATE FROM-M 1181 THRU M 111Q IS EQUAL TO W FAILURES EEE MILLION HOURS l
FAILURE RATE.
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3-D.
ANALYSIS 1)
HCGS BAILEY 862 SSLM' FAILURE RATE APPEARS TO HAVE-STABIIJZED IAW IEEE 500 STANDARD.
2)
CONFIRMED FAILURES'DID NOT INHIBIT THE OPERATION OF.
SAFETY RELATED FUNCTIONS..
3)
PREVIOUS DATA FOR 1989 INCLUDED: UNCONFIRMED' FAILURES, FAILURES INDUCED BY TESTING AND FAILED SPARES.- THE ATTACHED CURVE-HAS BEENc Ath7USTED TO ELIMINATE THESE-TYPES OF~ FAILURES.
E.
RECOMMENDATIONS
- 1) 'B2TTER EMPHASIS HAS TO BE IMPLEMENTED-IN
^ '
TROUBLESHOOTING TECHNIQUE WITH' RESPECT TO
' ISOLATING THE EXACT PROBLEM IN CONTROL LOGIC.
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