ML20028D174

Forwards LER 82-019/03L-0.Detailed Event Analysis Encl

ML20028D174
Person / Time
Site:	Oconee
Issue date:	01/06/1983
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028D175	List: ML20028D174 ML20028D177
References
NUDOCS 8301170200
Download: ML20028D174 (2)

Text

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CII A H LOTTI#, N.C. 2f1242 II AI,15. TI:CHER Trs.Erstown vurparame=r (70 8) 373-1Nll January 6,1 8M '310 F2 ,. 3 6' Mr. James P. O'Reilly, Regional , Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: Oconee Nuclear Station Docket No. 50-269

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-269/82-19. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.b(2) which concerns operation in a degraded mode permitted by a limiting condition for operation, and describes an incident which is con-sidered to be of no significance with respect to its effect on the health and safety of the public.

Very truly yours, fb.-4LL Hal B. Tucker i JCP/php

{ Attachment cc: Document Control Desk U. S. Nuclear Rrgulatory Commission Washington, D. C. 20555 INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station Mr. E. L. Conner, Jr.

Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

' ' IPd@OPV3 8301170200 830106 y _6 6L b i PDR ADOCK 05000269 PDR S

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Duke Power Company Oconee Nucicar Station  !

1 Report Number: R0-269/82-19 ,

Report Date: January 6,1983

? Occurrence Date: December 7, 1982

! Facility: Oconee Unit 1, Seneca, South Carolina

! Identification of Occurrence: Valve 1HP-25 was declared inoperable when j it would not fully open during its functional test.

Conditions Prior to Occurrence: 100% FP Description of Occurrence:

I On December 7, 1982 at 2220, valve 1HP-25 (a High Pressure Injection suction valve from the Borated Water Storage Tank) failed to open during an operational i valve functional test. Personnel were sent to investigate and repair the valve. It was determined that since the valve would not open, one train of HPI was inoperable. Therefore, per Technical Specification 3.3.1 and 3.0, a power reduction was begun at 2328. At 2330, the valve was manually cracked open, and the power reduction was stopped. The HP valve was successfully stroke tested and was declared fully operable at 2340.

Apparent Cause of Occurrence:

The apparent cause of this incident was component failure. The reason that the valve f ailed to remotely open was that it was stuck on the valve seat.

An investigation of work requests and incident reports written on 1, 2, 3HP-24 and 1, 2, 3HP-25 revealed that this is the first time the valve has failed to open remotely due to being stuck on its seat.

Analysis of Occurrence:

The 1HP-25 valve provides HPI pumps with suction from the Borated Water Storage Tank (BWST). During the time 1HP-25 failed to remotely open, 1HP-24, the

redundant valve, was operable. Therefore, had an Engineered Safeguard (ES) event occurred, 1HP-24 would have opened to provide the HPI pumps with suction from the BWST. There were no releases of radioactive materials, radiation exposures, or personnel injuries associated with this incident. The health and safety of the public were never endangered by this occurrence.

Corrective Action:

When the HPI train was determined inoperable, a power reduction began. It was terminated when the valve was manually cracked open. The valve was then -

checked by I&E Technicians. The valve was cycled successfully several times and the stroke time test was successfully completed. They found no faulty 1 indications. Investigation found that this type of failure had not previously occurred on 1, 2, 3HP-24 or -25. Since this is not a recurring problem, the corrective action taken is considered sufficient.

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