05000281/LER-1981-027-03, /03L-0:on 810501,TV-MS-201C Control Circuit Would Not Respond to Train B Actuation Signal.Caused by Shorting of Train B Coil Due to Moisture.Coil Replaced

/03L-0:on 810501,TV-MS-201C Control Circuit Would Not Respond to Train B Actuation Signal.Caused by Shorting of Train B Coil Due to Moisture.Coil Replaced

ML18139B363
Person / Time
Site:	Surry
Issue date:	05/29/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B362	List: 05000281/LER-1981-027, Forwards LER 81-027/03L-0 05000281/LER-1981-027-03, /03L-0:on 810501,TV-MS-201C Control Circuit Would Not Respond to Train B Actuation Signal.Caused by Shorting of Train B Coil Due to Moisture.Coil Replaced
References
LER-81-027-03L-01, LER-81-27-3L-1, NUDOCS 8106030275
Download: ML18139B363 (2)

LER-1981-027, /03L-0:on 810501,TV-MS-201C Control Circuit Would Not Respond to Train B Actuation Signal.Caused by Shorting of Train B Coil Due to Moisture.Coil Replaced

Event date:
Report date:
2811981027R03 - NRC Website

text

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l The performance of PT 8. 5 revealed that TV-MS--201C control circuit would not f""'nj"':;j I respond to a Train "B" actuation signal.

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ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

81-027/03L-O EVENT DATE:

05-01-81 TITLE OF EVE"NT:

DEFECTIVE.COIL FOR TV~MS-201C

1.

DESCRIPTION OF EVENT

With the unit at full power, the performance of PT-8. 5 (monthly CLS logic testing) revealed that TV-i1S-201C control circuit would not respond to a Train "B" actuation signal. This is contrary to Tech. Spec, 3.8.A,l and is reportable per Tech. Spec. 6.6.2.b(2).

2.

PROBABLE CONSEQUENCES and STATUS of REDUNDA..~ EOUIPMENT:

The main steam trip valves receive a Phase 3 containment isolation signal, from both trains of CLS, to ensure double barrier isolation of lines penetrating the containment.

The redundant actuation signal, Train A, was verified to be operable, Therefore, the health and safety of the public were not affected.

3.

CAUSE

The cause of this event was the shorting of the Train B coil due to moistur~

accumulation in an adjacent junction 1?0:k:;: -

4.

IMMEDIATE CORRECTIVE ACTION

The immediate corrective action was to verify the redundant train to be operable.

The defective coil was replaced and tested satisfactorly,

5.

SUBSEQUENT CORRECTIVE ACTION:

The other two coils, associated with Train "B"** were replaced as a precautionary measure.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The junction box has been sealed to preclude the entrance of moisture.

7.

GENERIC IMPLICATIONS:

None.