ML18139A603

LER 80-016/03L-0:on 800916,w/unit Operating Steady State at 100% power,TV-SS-201B Would Not Remain Closed When Control Switch Was Released.Cause Undetermined.Inside Trip Valve Closed & Air Secured to TV-SS-201B

ML18139A603
Person / Time
Site:	Surry
Issue date:	10/16/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A602	List: ML18139A601 ML18139A603 ML18139A604 ML18139A754 ML18139A755
References
LER-80-016-03L-02, LER-80-16-3L-2, NUDOCS 8010200499
Download: ML18139A603 (2)

Text

Re' FORM 7:771 , '

366 e LICENSEE EVENT REPORT

_U.S. N~CLEAR R_EGULATORY COMMISSlON (Pl.EASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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IWith the Unit operating steady state at 100% power, it was found that TV-SS-201B would

=uIJ 1not stay closed .when closed from control room. This 1.s contrary to T.S.3.8.A.l and is

~ 1reportable as per T.S.6.6.2.b.(2). The inside trip valve, TV-SS-201A, was operable and

~ !would have closed if needed for containment isolation, therefore the health and safety

]:JI] 1of the general public were not affected.

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. [II§] j"*The_ iJ;J.~pection Of the 'trip valve did--not reveal_ani--problems t*heref~r~ exact cause -,

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[I]JJ 1cannot b~ deter~ined . . R~move instrument air, allowing the valve to close,

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ATTACHMENT 1 e SURRY POWER STATION, UNIT 2 e

DOCKET NO: 50-281 REPORT NO: 80-016/031-0 EVENT DATE: 09-16-80 TITLE OF REPORT: TRIP VALVE TV-SS-201B MALFUNCTION

1. Description of Event:

With the unit operating steady state at 100% power, .it was found that TV-SS-201B would not remain closed when the control switch was released. This is contrary to T.S.-3.8:A.l and is reportable per T.S.-6.6.2.B(2).

2. Probable Consequences:

If isolation of this line had been required, the inside trip valve (TV-SS-201A) would have closed. Containment int~grit'y would therefore have been maintained and the health and safety of the general public were not affected.

3. Cause:

The inspection of the Trip Valves limit switches and associated components did not reveal any problems. The valve was successfully cycled and the malfunction could not be repeated. Therefore the exact cause cannot be determined.

4. Immediate Corrective Action:

• 5.

The immediate corrective action was to close the inside trip valve and secure air to TV-SS-201B.

Subsequent Corrective Action:

• The elcetricians inspected TB-SS-201B, cycled it satisfactory, and returned the valve to service.

6. Action Taken to Prevent Recurrence:

None

7. Generic Implications:

None