ML19350E591

LER 81-028/03L-0:on 810531,standby Gas Treatment Train C Relative Humidity Control Heater Circuit Breaker Found Tripped During Testing.Caused by Mechanical Failure.Circuit Breaker Replaced

ML19350E591
Person / Time
Site:	Browns Ferry
Issue date:	06/18/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350E589	List: ML19350E588 ML19350E591
References
LER-81-028-03L, LER-81-28-3L, NUDOCS 8106230314
Download: ML19350E591 (2)

Text

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GO Gl DOCILET NUM8En 74 75 REPORT DATE EVf NI OFSCHIPTIOfA AND PROBA8LE CONSEQUENCES h I l3)) lithi_lejerforining standby gas treatment system - humidity control capacity test 1

g,g i (SI 4.7.B-2),' SBGT train "C" relative humidity control heater circuit breaker was I

Q jfound tripped. (See T.S. 3.7.B.1) The standby gas treatment system is coninor to

l-l.95 Lunits 1, 2, and 3. There was no danger to the health or safety of the public.

I There were no previous similar events. I pgg 'l edundant R systems were available vid operable.

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- CAtJGE OESCRIPTION AND CORRECTtvE ACTIONS 27 "C" relative Pumidity control heater trip mechanism I

[T' D ICircuit breaker for SBGT train I

Lg:lfailed mechanically. The ITE Imperial Corporation Model HE3-B090. 3 cole 600-v ae g 'imolded case circuit breaker was replaced, successfuliv tested . v.curn.a en

..m4 r . I g ~ land SI 4.7.B-2 completed. This is considered a random failure and no further recurrenc_e I

m Icontrol is required.

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- l'ennessee Valley Authority Form BF 17 Browns Ferry Nuclear Plant BF 15.2 G/04/81 1.ER SUPPLE 31 ENTAL. INFORMATIOi; BFitO 259 / 81028 Techuical :ipecific.ition in .mleed T.,S.3.7.B.l. , _ _ ,

itoported Under Technical Specification ,6.7.2.b (2) *Date due NRC-Date* of Occurrence 5/31/81 ,_ Time of Occurrence 1415 Unit 1, 2, and 3 Identification and Des.c ription of Occurrence:

SBGT train "C" relative humidity control heater- circuit breaker tripped and would not reset.

(' gnditions Prior to Occurrence:

Unit i refueling outage linit 2 modification outage t' nit 3 at 100%

Action specified in the Technical Specification Surveillance Requirements met ihte to inoperable equipment. Describe. __

Performed operability test on SBGT trains A and B.

App.; rent Cause of occurrence:

Circuit breaker for SBGT train "C" relative humidity control heater trip mechanism failed meenanically.

A a]ysis of Occurrence:

.1ere was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action:

Replaced circuit breaker, successfully tested and returned to service.

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Failure Data:

NONE fjetention: Per d - Lifetime; Responsibility - Document Control Supervisor tllevision : .

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