05000260/LER-1980-043-03, /03L-0:on 801009,during Refueling operations,17 Level Switches Would Not Operate.Caused by Crud from Sys Accumulating on Float,Preventing Operation of Level Switch. Switches Cleaned,One Replaced

/03L-0:on 801009,during Refueling operations,17 Level Switches Would Not Operate.Caused by Crud from Sys Accumulating on Float,Preventing Operation of Level Switch. Switches Cleaned,One Replaced

ML18025B186
Person / Time
Site:	Browns Ferry
Issue date:	11/06/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B185	List: 05000260/LER-1980-043, Forwards LER 80-043/03L-0 05000260/LER-1980-043-03, /03L-0:on 801009,during Refueling operations,17 Level Switches Would Not Operate.Caused by Crud from Sys Accumulating on Float,Preventing Operation of Level Switch. Switches Cleaned,One Replaced
References
LER-80-043-03L-02, LER-80-43-3L-2, NUDOCS 8011120457
Download: ML18025B186 (4)

LER-1980-043, /03L-0:on 801009,during Refueling operations,17 Level Switches Would Not Operate.Caused by Crud from Sys Accumulating on Float,Preventing Operation of Level Switch. Switches Cleaned,One Replaced

Event date:
Report date:
2601980043R03 - NRC Website

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VENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABI.E CONSEQUENCES Qio During refueling operations while performing maintenance instruction for scram

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~08 accumulator level switches, it was found that seventeen level switches would not operate due to dirty floats and-one other switch needed to be replaced.

Reference:

T.S. 3.3.A.2.e.

There was no danger to health or safety of public.

No redundant system.

Previous occurrence BFRO-50-259/80014.

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Crud from s stem accumulated on float reventin o eration of. level switch.

One switch was re laced due to random failure.

The switches were cleaned.

Scram accumulator level switches are being checked every refueling outage.

GEMS Inc.,

type, liquid level, size Max. resist.

load 10.0 VA.

Dwg 117C1434 P001.

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1/10/'l9 BFRO-M-260 / 8043 Technical Specification Involved 3.3.A.2.e Reported Under Te<<hnical Specification 6-7.2.b(2)

Date of Occurrence 10/8, 9/80 Time of Occurrence Unit

~ Identification and Descr~ition of Occurrence:

Seventeen scram accumulator level switches were found that would not operate due to dirty floats and one other switch had to be replaced.

Conditions =Prior to Occurrence:

Unit 1 8 100%

Unit 2 6 0 refueling outage Unit 3 8 100%

Action "pacified in the Technical Specification Surveillance Requirements met ciu". to in~to ereble etiuiyment.

Deco."ibe.

NA

~A>~parent Cause of Occurrence:

Crud from system accumulated on float preventing operation of level switch.

The one other switch was considered an isolated random failure.

Ar~tal sis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or in)ury and no danger to the health or safety of the oublic-,

Corrective Action

The switches were cleaned.

One switch was replaced.

The scram accumulator level switches are being checked every-refueling outage.

Failure Data:

BFRO-50 259/7725

> 259/7836

> 259/8006

> 259/ 8014

> 260/7909

> 296/7805

>Retention;

>eriod - I.ifetane; BesponsibQ ty - Administrative Supervisor

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