05000336/LER-1980-021-03, /03L-0:on 800506,during Routine Testing to Prove Diesel operability,13U Diesel Generator Breaker Closed After Manual Opening.Caused by Loose Bolt in Generator Spring Charging Sys Causing Latch to Fail.Bolt Tightened

/03L-0:on 800506,during Routine Testing to Prove Diesel operability,13U Diesel Generator Breaker Closed After Manual Opening.Caused by Loose Bolt in Generator Spring Charging Sys Causing Latch to Fail.Bolt Tightened

ML19323H068
Person / Time
Site:	Millstone
Issue date:	06/04/1980
From:	Foster E NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323H059	List: 05000336/LER-1980-021, Forwards LER 80-021/03L-0 05000336/LER-1980-021-03, /03L-0:on 800506,during Routine Testing to Prove Diesel operability,13U Diesel Generator Breaker Closed After Manual Opening.Caused by Loose Bolt in Generator Spring Charging Sys Causing Latch to Fail.Bolt Tightened
References
LER-80-021-03L, LER-80-21-3L, NUDOCS 8006110256
Download: ML19323H068 (1)

LER-1980-021, /03L-0:on 800506,during Routine Testing to Prove Diesel operability,13U Diesel Generator Breaker Closed After Manual Opening.Caused by Loose Bolt in Generator Spring Charging Sys Causing Latch to Fail.Bolt Tightened

Event date:
Report date:
3361980021R03 - NRC Website

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- EVENT DESCRIPTION AND PROBAutE CONSEQUENCES @

>T21 l Durina routine testina to prove Diesel operability, the 13U Diesel Generator Breaker I

,j3j j was opened manually per procedure.

The Diesel Generator Breaker (General Electric I

gg [ Magne-blast Type AM-4.16-250-9H) reclosed itself thereby returnino the Generator l

y l on line out of phase.

Operability surveillances for the other Facility were completedl gg l and operations continued per Technical Specification 3.8.1.1.a.

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36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 3;Oj l A loose bolt in the 13U Diesel Generator Breaker's Sprino Charoino Svstem caused the I

, ;i ; l closing latch to fail.

The bolt was retightened and the breaker tested and returned _j y [ to service.

Total time out of service was 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Other similar breakers were 1

g l inspected and found satisfactory.

There are no known similar incidents.

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