05000260/LER-1981-030-03, /03L-0:on 810629,while Performing Surveillance Insp 4.5.B.1.D,valve 2-FCV-2-74-57 Became Inoperable,Making RHR Loop I Inoperable.Caused by Geared Limit Finger Base Breaking Off of Operator.Finger Base Replaced

/03L-0:on 810629,while Performing Surveillance Insp 4.5.B.1.D,valve 2-FCV-2-74-57 Became Inoperable,Making RHR Loop I Inoperable.Caused by Geared Limit Finger Base Breaking Off of Operator.Finger Base Replaced

ML20009E526
Person / Time
Site:	Browns Ferry
Issue date:	07/21/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E515	List: 05000260/LER-1981-030, Forwards LER 81-030/03L-0 05000260/LER-1981-030-03, /03L-0:on 810629,while Performing Surveillance Insp 4.5.B.1.D,valve 2-FCV-2-74-57 Became Inoperable,Making RHR Loop I Inoperable.Caused by Geared Limit Finger Base Breaking Off of Operator.Finger Base Replaced
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8107280280
Download: ML20009E526 (2)

LER-1981-030, /03L-0:on 810629,while Performing Surveillance Insp 4.5.B.1.D,valve 2-FCV-2-74-57 Became Inoperable,Making RHR Loop I Inoperable.Caused by Geared Limit Finger Base Breaking Off of Operator.Finger Base Replaced

Event date:
Report date:
2601981030R03 - NRC Website

text

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,.,,; During normal operation, while performing SI 4.5.B.1.d, valve 2-FCV-2-74-57, became I (containment cooling mode) inoperable. See T.S.

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43 44 47 CAUSE DESCHIPTION AND CORRECTIVE ACTIONS switch finger base broke off of the operator, making valve inoperable.

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l Replaced the finger base of the limitorque type SMB, size 2 valve motor operator.

liltj I i i ii 1 An investigation of the vibration problem with this valve is being conducted.

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1. I '. ! :;til l'l.I'. MENTAL. I N Fi slim A i If ie; 81030 Tr. hnical Specific.ition involved 3.5.B.7 B F i t t i.. r,0- 260,, f lieported lindur Technical S reification 6.7 2.b(2)

• Date <tue NRC: 7/29/81 I

Date of Occurrence 6/29/81 Time of Occurrence 2030 Unit 2

hientification anij ljuseription of occurrence:

While performing SI 4.5.B.1.d., valve 2-FCV-2-74-57, became inoperable, making RilR loop I inoperable.

t'.o u itiori:. I'ri..: to ()cciarceni e Unit 1 in' refueling' outage.

Unit 2 at 99%.

11 nit 3 at 95%

Act io:: q,cufb I in-the Technical Specification Surveillance Requirements met

..ir to it]operabit e iutpraent.

Desc ribe.

Met requirements of T.S. 4.5.B.7.

Appat ent (.*aut.c of f )ccurrence Geared limit switch " red" switch finger base broke off of the operator, making the. valve inoperable.

Analywis <>f_ Qcrparrence.

There was no danger to the health or safety of the p.alic, no release of activity, no damage to the plant or equipment, and no resulting significant chain of y

4 events.

t 'urr: etice Action :

Replaced the " red" finger base of the limitorque type SMB size 2 valve on the motor operator. The vibration problem with this valve is being investigated.

Failure Dat.a:

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