05000281/LER-1981-028-03, /03L-0:on 810502,emergency Diesel Generator Output Breaker Closed Inadvertently,Motorizing Generator 3.Caused by Inadequate Procedure Not Positively Controlling Generator Position.Generator Started & Loaded

/03L-0:on 810502,emergency Diesel Generator Output Breaker Closed Inadvertently,Motorizing Generator 3.Caused by Inadequate Procedure Not Positively Controlling Generator Position.Generator Started & Loaded

ML18139B368
Person / Time
Site:	Surry
Issue date:	06/02/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B367	List: 05000281/LER-1981-028-03, /03L-0:on 810502,emergency Diesel Generator Output Breaker Closed Inadvertently,Motorizing Generator 3.Caused by Inadequate Procedure Not Positively Controlling Generator Position.Generator Started & Loaded 05000281/LER-1981-029-03, /03L-0:on 810502,leakage Monitoring Valve 2-CV-12 Found Open & Downstream Pipe Cap Missing Following Return to Power on 810428.Caused by Inadequate Procedure.Valve Closed & Pipe Cap Replaced 05000281/LER-1981-030-03, /03L-0:on 810504,emergency Diesel Generator Output Breaker Opened on Overspeed.Caused by Misaligned Overspeed Trip Limit Switch.Limit Switch Adjusted & Generator Tested Satisfactorily ML18139B366
References
LER-81-028-03L, LER-81-28-3L, NUDOCS 8106050423
Download: ML18139B368 (2)

LER-1981-028, /03L-0:on 810502,emergency Diesel Generator Output Breaker Closed Inadvertently,Motorizing Generator 3.Caused by Inadequate Procedure Not Positively Controlling Generator Position.Generator Started & Loaded

Event date:
Report date:
2811981028R03 - NRC Website

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VENT OESCrllPTlON.:.NCf°PROBABi..S CONSEQUENCES@

l On May 2,1981, with Unit No,2 at 100% power, during the performance of PT-8,*5

@m.1 on Unit No.1, EDG output breaker (15J3). was inadvertently closed, thereby J]J1l.J motorizing No. 3 EDG.

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(([§] I The cause of this event was due*to inadequate* nrocedure.

The output breaker; 15J3.

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ATTACHMENT 1 SURRY POWER DOCKET NO:

REPORT NO:

EVENT DATE:

STATION, UNIT 2 50-281 81-028/03L-0 05-02-81 TITLE OF EVENT:

. BREAKER 15J3 INADVERTENTLY CLOSED

1.

DESCRIPTION OF EVENT

On May 2,1981, with Unit 2 at 100% power, during the performance of PT-8,5 (Monthly CLS Logic Test) on Unit 1,- EDG output breaker (15J3) was in-advertently closed,, thereby motorizing No. 3 EDG.

Phase ~'B" overcurrent trip caused the breaker to re-open, This event is contrary to Tech. Spec, 3.16.A.l and is reportable per Tech.

Spec. 6.6.2.b(2).

2.

PROBABLE CONSEQUENCES AND STATUS of REDUNDANT EQUIPMENT:

Redundant Emergency Diesel Generators (EDG) provide emergency power to redundant safety-related components that are designed to mitigate the consequences of postulated accidents.

The redundant EDG was operable during the event and the affected EDG was returned to service within the time limits of Tech. Spects. Therefore, the health and safety of the public were not affected/

3;*. CAUSE:

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The cause of this event was due to inadequate procedure.

The procedure, PT-8.5, did not ppsitively control the positioning of 15J3.

4.

IMMEDIATE CORRECTIVE ACTION

The redundant EDG, No. 2, was verified to be in automatic and available.

5.

SUBSEQUENT CORRECTIVE ACTION:

The electrical department tested No.3 EDG and breaker 15J3; the results were satisfactory *.

No.3 EDG was started and loaded to verify operability.

6.

ACTION TAKEN TO PREVENT RECURRENCE*:

P.T. 8.5 has been cha_nged to ensure positive control of the EDG output b.reakers.*

7.

GENERIC IMPLICATIONS:

None.