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

/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

ML18139B370
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-81-030-03L-01, LER-81-30-3L-1, NUDOCS 8106050429
Download: ML18139B370 (2)

LER-1981-030, /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

Event date:
Report date:
2811981030R03 - NRC Website

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Attachment Surry Power Station Unit 2 Docket No. 50-281 Reper~ No. 81-030/03L-O Ev.ent Date:

05-04~81

1. 2 EDG OVERSPEED TRIP MALFUNCTION

1.

DESCRIPTION OF EVENT

On May 4, 1981, while performing PT-22.3B (#2 EDG monthly test), the EDG

• output breaker automatically opened on overspeed.

This is contrary to Tech ~pee 3.16.A.l and is* reportable per Tech Spec 6.6.2.b(2).

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

3.

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 Spec's. Therefore, the health and safety of the public were not affected.

CAUSE

The cause of... the ev*entwas a misaligned overspeed trip limit switch thereby cre*at i ng a false s i gna 1.

• 4.

IMMEDIATE CORRECTIVE ACTIONS

The redundant EDG, No. 3, was verified to be in automatic and available.

5.

SUBSEQUENT CORRECTIVE ACTION:

The limit switch-was adjusted and the EDG tested satisfactorily.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

None deemed necessary.

7.

GENERAL I MPLI CAT IONS:

The #1 and #3 EDG overspeed limit switches were examined and no problems were found therefore this event is not considered to be generic.