ML19308B520

LER 78-007/03L-0:on 780208,suction Valve 3LPSW-123 Observed Closed During 3B Pump Startup.Valve Closure Cause Unknown. Probably Caused by Erroneous Closing During Repairs on on Pervious Day.Valve Opened & Pump Checked for Damages

ML19308B520
Person / Time
Site:	Oconee
Issue date:	03/13/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19308B517	List: ML19308B514 ML19308B520
References
LER-78-007-03L-01, LER-78-7-3L-1, NUDOCS 8001090526
Download: ML19308B520 (2)

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DUKE POWER COMPANY OCONEl'. UNIT 3 Report Number: R0-287/78-7 .

Report Date: March 13, 1978 Occurrence Date: February 8,1978 Facility:- Oconee Unit 3, Seneca, South Carolina Identification of Occurrence: 3LPSW' 123 Found Closed Conditions Prior to Occurrence: 100% Full Power Description of Occurrence:

On February 8,197'8, at 0940, the 3B Low Pressure Service Water (LPSW) pump was started. When the operator noticed that the pump suction valve, 3LPSW-123, was closed, the pump was stopped. Investigation by operating personnel determined that the valve had been closed since approximately 1600 on-February 7, 1978. Therefore, the pump had been ef fectively out-of-service for about 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br />. The pump suction str.ainer had been serviced the pre-vious day at about the time of the valve closure, but the valve had not been required to be. closed by the procedure. The valve was opened and the pump was verified as being undamaged by the incident.

Apparent Cause of Occurrence: '

The exact cause of the valve closure is unknown. There are two. controls, for the valve, one in the control room and one in the area of the pump.

Discussions were held with_ perso'nnel in both areas, but none had any rec-

, ollection as to how the val've was closed or with regard as t,o who closed it.

Analysis of Occurrence:

The closure of 3LPSW' 123 rendered one train of the LPSW system inoperable.

However,'the control room could have opened the valve at any time if the train was needed. Technical Specification 3.3.5 allows one train to be inoperable for a period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for test or maintenance, since one train is sufficient to provide necessary cooling in an accident situation.

One train was operable although the second train was inoperable for ar cause other than test or maintenance. Pu,blic health and safety were.not endangered by this incident.

Corrective Action:

The valve was opened after evaluation of the occurrence. The pump was vented, restarted, and tested to assure that it had not sustaLned damage.

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