05000280/LER-1980-016-03, /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

/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: 05000280/LER-1980-016-03, /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 05000280/LER-1980-025-03, /03L-0:on 801003,w/Unit 2 at 100% Power,Periodic Test 27D Revealed That Amperage for Circuit 2A Panel 10 Was Below Acceptance Criteria.Caused by Damaged Heat Tracing Tape.Verified That Redundant Circuit Was Operable 05000280/LER-1980-064-03, /03L-0:on 800916,w/Unit 1 at Cold Shutdown & Unit 2 at 100% Power,Auxiliary Bldg Filter Banks Found to Be Less Efficient than Required.Caused by Settling of Charcoal in Filters.Filters Replaced 05000280/LER-1980-065-03, /03L-0:on 800917,w/unit at Refueling Shutdown, MOV-SW-103B Did Not Operate Electrically During Flush of Recirculation Spray Heat Exchangers.Cause Undetermined,But Marine Growth Suspected.Valve Manually Cycled ML18139A601
References
LER-80-016-03L-02, LER-80-16-3L-2, NUDOCS 8010200499
Download: ML18139A603 (2)

LER-1980-016, /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

Event date:
Report date:
2801980016R03 - NRC Website

text

Re' FORM 366 7:771,

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I With 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

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1reportable as per T.S.6.6.2.b.(2).

The inside trip valve, TV-SS-201A, was operable and

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

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ATTACHMENT 1 e

e SURRY POWER STATION, UNIT 2 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

4.

5.

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.

Immediate Corrective Action

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