ML19263C044

LER 79-003/03L-0 on 790102:during Periodic Test,Noted That Containment Isolation Valve TV-SV-102-1 Would Not Shut Fully.Cause Undetermined

ML19263C044
Person / Time
Site:	North Anna
Issue date:	01/29/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263C039	List: ML19263C038 ML19263C043 ML19263C044
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902020187
Download: ML19263C044 (2)

Text

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(7 77 LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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[ TIT) l tion valve TV-SV-102-1 would not shut fully. This is contrary to T.S. 3.6.3.1. l 0 4 l Containment isolation valve TV-SV-103 was closed and TV-SV-102-1 was restored to l 0 s loperable status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> as required by the applicable action statement. This O s event is reportable as per T.S. 6.9.1.9.b. I 10171 l I O 8  !

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l0 l lThe cause of the isolation valve not closina is unknown at this time. Immediate I i ij l corrective action was to close TV-SV-103 and submit an emeraency maintenanco rannrt I

, , TV-SV-102-1 was cycled and fully closed 3 times. The valve was returned to coerable I g i i 31 l status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of the initial failure. I l i 14 I I l 7 8 9 80 STA S  % POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION li I s I [E_J@ l 0 [ 9 l 7 l@l NA l lBl@l Feriodic Test l A Tt V e T Y CO TENT RELEASED Of Rt LE ASE AYOUNT OF ACTIVITY LOC ATION OF RELEASE NA l l NA l li lcl 8[Z_J 7 9

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NAME OF PREPARER PHONE: 703-894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-003/03L-0 Description of Event:

On 1-2-79 during the performance of a periodic test, it was discovered that Containment Isolation Valve TV-SV-102-1 would not fully shut. This is contrary to T.S. 3.6.3.1.

Isolation Valve TV-SV-103 was closed and TV-SV-102-1 was restored to operable status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> as required by the applicable Action Statement.

This event is reportable as per T.S. 6.9.1.9.b.

Probable Consecuences of Occurrence:

The OPERABILITY of the containment isolation valves ensures that the containment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment.

Since the redundant isolation valve TV-SV-103 was operable and secured closed, there was no effect upon the safe operation of the plant. As a res ul t,#-~-

the public health and safety was not endangered.

Cause of Occurrence:

The cause of the Isolation Valve not closing is unknown at this time.

Immediate Corrective Action:

Isolation Valve TV-SV-103 was placed in the closed position with the operating air isolated to prevent valve actuation. An emergency maintenance report was subnitted.

The isolation valve was cycled 3 times and fully closed each time. The valve was returned to operable status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of the initial failure.

There was no apparent reason discovered for the initial failure of the valve.

Scheduled Corrective Action:

TV-SV-102-1 will be inspected during an appropriate cold shutdown to determine the cause of its failure to operate properly.

Actions Taken to Prevent Recurrence:

Actions to prevent recurrence will be determined pending the inspection stated above.

._ _ _ .