05000281/LER-1979-013-01, /01T-0:on 791007,MOV-SW-202B Operated Mechanically & Electrically in Apparent Reverse Manner W/Unit at Cold Shutdown.Caused by Disc Spline of Svc Water Valve Improperly Aligned to Gear Train of Motor Operator

/01T-0:on 791007,MOV-SW-202B Operated Mechanically & Electrically in Apparent Reverse Manner W/Unit at Cold Shutdown.Caused by Disc Spline of Svc Water Valve Improperly Aligned to Gear Train of Motor Operator

ML18136A098
Person / Time
Site:	Surry
Issue date:	10/19/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A097	List: 05000281/LER-1979-013, Forwards LER 79-013/01T-0 05000281/LER-1979-013-01, /01T-0:on 791007,MOV-SW-202B Operated Mechanically & Electrically in Apparent Reverse Manner W/Unit at Cold Shutdown.Caused by Disc Spline of Svc Water Valve Improperly Aligned to Gear Train of Motor Operator
References
LER-79-013-01T, LER-79-13-1T, NUDOCS 7910240562
Download: ML18136A098 (2)

LER-1979-013, /01T-0:on 791007,MOV-SW-202B Operated Mechanically & Electrically in Apparent Reverse Manner W/Unit at Cold Shutdown.Caused by Disc Spline of Svc Water Valve Improperly Aligned to Gear Train of Motor Operator

Event date:
Report date:
2811979013R01 - NRC Website

text

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. 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

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I With the unit at cold shutdown, MOV-SW-202B was found operating mechanically and e]ec-I

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trically in an apparent reverse manner.

This could have caused the MDV to open versus I mIJ close on a safeguards signal, which is contrary to Technical Specification 3, 4-A. 5.

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Closure of this valve is needed during safeguards Isolation to main-

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tain proper canal level.

The event is reportable per Technical Specification [IIz] I 6.6.2.a.(2).

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DJ)) I The improper operation of MOV..SW-202B was due to the incorrect construction in-

[IJI] I stallation of the motor operator and the associated gear train to the spline of [IlI] I the valve's disc.

The corrective action taken was to remove the service water

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9 11 12 80 LOSS OF OR DAMAGE TO FACILITY '43' TYPE

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Surry Power Station, Unit 2 Docket No: 50-281 Attachment, Page 1 of 1 Report No: 79-013/0lT-0 Title of Report:

Inoperative Valve MOV-SW-202B

1.

Description of Event

With the unit at cold shutdown, an attempt was made to run the service water pumps for Unit 2 via service water valve MOV-SW-202B.

With service water valve MOV-SW-202B electrically indicating open, the service water pumps did not receive suction.

Further investigation revealed the manual opera-tor and the motor operator of MOV-SW-202B operated in what appeared to be a reverse manner.

This is contrary to Technical Specifications 3.4-A.5 and 3.14-A.l.

The event is reportable in accordance with Technical Speci-fication 6.6.2.a.(2).

2.

Probable Consequences of Event:

The improper operating condition of service water valve MOV-SW-202B had no effect upon the health and safety of the general public because the unit was at cold shutdown without the need for safeguards isolation.

3.

Cause of Event

Upon disassembly, the disc's spline of the service water valve was found to be improperly aligned to the gear train of the motor operator.

4.

Immediate Corrective Action

The immediate corrective action taken was to remove the valve from service.

5.

Scheduled Corrective Action:

The valve disc will be re-aligned with the gear train of the motor operator.

6.

Action Taken to Prevent Recurrence:

No other action than to repair the valve is required"

7.

Generic Implications:

5:L2 This event presents no generic implications.

The problem was due to a con-struction installation fault.