ML19332A254

LER 79-102/03L-1:on 791023,following Routine Sampling of B Core Flood Tank (Cft),B CFT Sample Isolation Valve CFV-12 Would Not Close.Cft Isolation Valve CFV-42,in Closed Position,Isolated Penetration.Cause Unknown

ML19332A254
Person / Time
Site:	Crystal River
Issue date:	08/29/1980
From:	Neuschaefer E FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19332A250	List: ML19332A249 ML19332A254
References
LER-79-102-03L, LER-79-102-3L, NUDOCS 8009110342
Download: ML19332A254 (2)

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to isolate the penetration. This is the second occurrence o'f th'is type reportedj gg for CFV-12. Reference LER 77-109. J

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I Supplementary Information Report No.: 50-302/79-102/03L-1 Facility: Crystal River Unit #3 Report Date: 29 August 1980 Occurrence Date: 23 October 1979 Identification of Occurrence: "B" Core Flood Tank sample isolation valve, CFV-12, inoperabic 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 l 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 immediately isolate the affected penetration. CFV-42 operability was restored when CFV-12 was closed. CFV-12 was maintained in the closed position with the valve operating power supply de-energized and under admin-istrative control until determination of failure was completed.

Designation of Apparent Cause: The cause of this event is unknown.

Analysis of Occurrence: No effect upon the plant or general public.

Corrective Action: Further investigation and troubleshooting has revealed nothing relative to CFV-12's failure to close. The j valve was declared operable on 4 December 1979 after l successful completion of SP-135, Engineered Safep4ards l

Actuation System Response Time Test. To further verify operability, CFV-12 was repetitively cycled on 5 August 1980 with no failure and has functioned properly to date. As a result of this investigation no further corrective action is deemed necessary.

Failure Date: This is the second occurrence reported for CFV-12.

(Reference LER 77-109)

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