05000296/LER-1980-034-03, /03L-0:on 800829,during Normal Operation, Investigation of Overload for RHR Area Cooler Fans Revealed Overload for RHR Pump Area Cooler Fan 3A Was Set Too High. Cause Unstated.Relay Replaced

/03L-0:on 800829,during Normal Operation, Investigation of Overload for RHR Area Cooler Fans Revealed Overload for RHR Pump Area Cooler Fan 3A Was Set Too High. Cause Unstated.Relay Replaced

ML19338D706
Person / Time
Site:	Browns Ferry
Issue date:	09/19/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D699	List: 05000296/LER-1980-034, Forwards LER 80-034/03L-0 05000296/LER-1980-034-03, /03L-0:on 800829,during Normal Operation, Investigation of Overload for RHR Area Cooler Fans Revealed Overload for RHR Pump Area Cooler Fan 3A Was Set Too High. Cause Unstated.Relay Replaced
References
LER-80-034-03L-02, LER-80-34-3L-2, NUDOCS 8009230675
Download: ML19338D706 (2)

LER-1980-034, /03L-0:on 800829,during Normal Operation, Investigation of Overload for RHR Area Cooler Fans Revealed Overload for RHR Pump Area Cooler Fan 3A Was Set Too High. Cause Unstated.Relay Replaced

Event date:
Report date:
2961980034R03 - NRC Website

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75 REPOR T D&TC rid EVEN T DESCRIPTION AND PROBA8LE CONSEQUENCES l o l 7 l l Diaring normal operation while invest.igating ove - aad setting for RHR area cooler g

pg-l ;-) l f ans, the. overload for 3A RHR pump area cooler fan was ' found to be set too high.

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' LElt; SUPPLEMENTAL INFORMATION x

' hFitO90- ?: 296'f $ 80 34_ :Techn' cal Specification involved Table 3.2.5-c : 6.7.2.b (2)'

Liteported-Under Technical: Specification 3

~ Dnte 'of.' Occurrence 8/29/80 '

Timefof Occurrence '2245

- Unit Idantification and Description"of Occurrence':

While investigating overload setting for RHR area cooler fans, the overload for 3A

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'RHR pump area cooler. fan was. found L to be set too high..When the. overload was

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adjusted to the' proper setting,: the everload relay failsd causing the fan to trip.

. Conditions Prior to Occurrence:

Unit 1 @ 99%

t' nit 2 @ 92% -

Unit 3 @ 99%

Acti>n.specified-in the Technical Specification Surveillance' Requirements met due. to inoperable equipment. Describe.

Syst'em II 'RHRS ' CSS and Diesels verified operable.

[ppannt Cause of' Occurrence:

The overload: relay failed during maintenance. This was a random failure..

Analysik of Odeurrence:

There was no damage to plant ' equipment. There'was no activity release, no personnel-exposure or.-injury and no ' danger to the health or safety of the public.

'l Corrective Action:

'The ' defective overload, relay was.. replaced. -Recurrence control not required due

.to low failure rate.

Failure Data:

None?

• Retention: ~ ; Period :- Lifetime;~. Responsibility - A_dministrative Supervisor

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