05000296/LER-1980-049-03, /03L-0:on 801114,RHR Pump 3D Tripped on Instantaneous Overcurrent While Starting.Caused by Loose Relay Adjustment Locknut.Locknut Tightened & Relay Adjusted

/03L-0:on 801114,RHR Pump 3D Tripped on Instantaneous Overcurrent While Starting.Caused by Loose Relay Adjustment Locknut.Locknut Tightened & Relay Adjusted

ML19345D745
Person / Time
Site:	Browns Ferry
Issue date:	12/11/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D742	List: 05000296/LER-1980-049, Forwards LER 80-049/03L-0 05000296/LER-1980-049-03, /03L-0:on 801114,RHR Pump 3D Tripped on Instantaneous Overcurrent While Starting.Caused by Loose Relay Adjustment Locknut.Locknut Tightened & Relay Adjusted
References
LER-80-049-03L-02, LER-80-49-3L-2, NUDOCS 8012160549
Download: ML19345D745 (2)

LER-1980-049, /03L-0:on 801114,RHR Pump 3D Tripped on Instantaneous Overcurrent While Starting.Caused by Loose Relay Adjustment Locknut.Locknut Tightened & Relay Adjusted

Event date:
Report date:
2961980049R03 - NRC Website

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• t EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h tol2l l During normal operation, while performing S.I. 4.5.B. l.b, RHR pump 3D tripped on _

g o ;3l l instantaneous overcurrent while starting. There was no danger to public health or [ol4g (safety. No significant resulting events. Redundant RHR loop was operable. Reference

ol3, [T.S. 3.5.B.4 Previous event 296/80027.

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,, g g g j Relay adjustment locknut came loose and allowed trip setting to drif.: too low.

Adjusted relay and tightened lock nut.

Locking nuts on pump 3A, B & C relays

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,,,;were verified tight.

3D relays will be checked monthly for next. six months.

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o Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 r.

I LER SUPPLEMENTAL INFORMATION p.

BFRO 296 / 8049 Technical Specification Involved 3.5.B.4 Reported Under Technical Specification 6.7.2.b(2) l Date of Cccurrence 11/14/80 Time of Occurrence 0300 Unit 3

Identification and Description of Occurrence:

While performing RHR pump 3D operability test which was required due to RHR pump 3B being inoperable, pump 3D tripped during SI 4.5.B.l.b due to instantaneous I

overcurrent while starting.

Conditions ~ Prior to Occurrence:

I, Unit 1 @ 98%

Unit 2 @ 0% refueling Unit 3 @ 87% - 3B RHR pump tagged out for maintenance to 3B RHR rest exchanger.

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

i Surveillance testing per Tech Spec 4.5.B.3 was complete except for 3D pump operability when incident occurred. Per Technical Specification 4.5.",.4, no additional surveillance is required.

Apparent Cause of Occurrence:

Relay adjustment lock nut came loose and allowed trip setting to drif t too low.

r-Analysis of Occurrence:

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

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public.

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Corrective Action

Adjusted relay and tightened locknut. Locking nuts on pump 3A, B and C relays were verified tight.

3D relays will be checked monthly for the next six months.

PSO it ev-luating revision to their field test manual to insure relay lock nuts are tigh m ed.

Failure Data:

BFRO-50-296/80027.

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

• Revision : 60 i