05000302/LER-1979-102-03, /03L-0:on 791023,core Flood Tank B Sample Isolation Valve CFV-12 Would Not Close.Cause Unknown.Valve Presently Maintained in Closed Position Until Repairs Can Be Completed

/03L-0:on 791023,core Flood Tank B Sample Isolation Valve CFV-12 Would Not Close.Cause Unknown.Valve Presently Maintained in Closed Position Until Repairs Can Be Completed

ML19210D700
Person / Time
Site:	Crystal River
Issue date:	11/15/1979
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D697	List: 05000302/LER-1979-102, Forwards LER 79-102/03L-0 05000302/LER-1979-102-03, /03L-0:on 791023,core Flood Tank B Sample Isolation Valve CFV-12 Would Not Close.Cause Unknown.Valve Presently Maintained in Closed Position Until Repairs Can Be Completed
References
LER-79-102-03L, LER-79-102-3L, NUDOCS 7911270465
Download: ML19210D700 (2)

LER-1979-102, /03L-0:on 791023,core Flood Tank B Sample Isolation Valve CFV-12 Would Not Close.Cause Unknown.Valve Presently Maintained in Closed Position Until Repairs Can Be Completed

Event date:
Report date:
3021979102R03 - NRC Website

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SUPPLEMENTARY INFORMATION REPORT NO.:

50-302/79-102/03L-0 FACILITY:

Crystal River Unit #3 REPORT DATE:

15 November 1979 OCCURRENCE DATE:

23 October 1979 IDENTIFICATION OF OCCURRENCE:

"B" Core Flood Tank Sample Isolation Valve CFV-12 inoperable contrary to Technical Specification 3.6.3.1.b.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 Power Operation (100%)

DESCRIPTION OF OCCURRENCE:

At 0600 following routine sampling of "B" Core Flood Tank, it was reported that "B" CFT Sample Isolation Valve CFV-12 would not close. CFT Sample Isolation Valve CFV-42 was closed and disabled to isolate the affected penetration immediately.

CFV-42 operability was restored when CFV-12 was closed.

CFV-12 is being maintained in the closed position with the valve operating power supply de-energized and under administrative control until repairs can be completed.

DESIGNATION OF APPARENT CAUSE:

The cause of this event is unknown. Troubleshooting and subsequent repair of CFV-12 is being delayed due to the inability to perform required post-maintenance leak-rate testing. The leak-rate test equipment is presently under repair.

ANALYSIS OF OCCURRENCE:

No effect upon the plant or general public.

CORRECTIVE ACTION

Further investigation into the cause of this event will commence upon completion of repairs to the leak-rate test equipment.

Corrective action will be based upon the results of that investigation and submitted as a supplement to this report.

FAILURE DATA:

This is the second occurrence reported for CFV-12.

Reference LER 77-109.

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