05000296/LER-1980-019-03, /03L-0:on 800527,during Normal Operation, Discovered Drywell Sump Flow Transmitter FT-77-16 Had Output Signal Shift.Cause Unknown.Transmitter Replaced & Instrument Loop Calibr

/03L-0:on 800527,during Normal Operation, Discovered Drywell Sump Flow Transmitter FT-77-16 Had Output Signal Shift.Cause Unknown.Transmitter Replaced & Instrument Loop Calibr

ML18025A937
Person / Time
Site:	Browns Ferry
Issue date:	06/25/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A936	List: 05000296/LER-1980-019, Forwards LER 80-019/03L-0 05000296/LER-1980-019-03, /03L-0:on 800527,during Normal Operation, Discovered Drywell Sump Flow Transmitter FT-77-16 Had Output Signal Shift.Cause Unknown.Transmitter Replaced & Instrument Loop Calibr
References
LER-80-019-03L-01, LER-80-19-3L-1, NUDOCS 8007010377
Download: ML18025A937 (4)

LER-1980-019, /03L-0:on 800527,during Normal Operation, Discovered Drywell Sump Flow Transmitter FT-77-16 Had Output Signal Shift.Cause Unknown.Transmitter Replaced & Instrument Loop Calibr

Event date:
Report date:
2961980019R03 - NRC Website

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2 QB DOCKET NUIJBER GB 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QID During normal operation the drywell sump flow transmitter FT-77-16 was discovered

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Reference T.S. 3.6.C.1.

No redundant systems.

No danger to health or safety of public.

Previous occurrence:

259/73007.

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Flow transmitter, FT-77-16, suffered a zero shift each time sum um s were run.~

Cause of shift.unknown.

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GE5!AC Nodal 555111BDAA3AAA flow transmitte w

replaced and instrument loop calibrated.

No recurrence control lanned due to low incident rate.

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Operator observed 4G 8<5 811 P.I2 7

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Tennessee Valley Authori Bro.vns Ferry Nuclear Plant I.ER SUPPI E~iIENTAL INFORMATION N<<m AV--tv BV 15. 2 1/10/79 BFRO 50 296 / 8019 Technical Specification Involved 3.

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~ 1 Repor ted Under Technical Specification

6. 7.2.b(2)

Date of Occurrence 5/

/

Time of Occurrence

'Unit Identification and Descri tion'of Occurrence:

Drywell sump flow transmitter FT-77-16 was discovered to suffer a zero shift each time the sump pump was'un'.'onditions Prior to Occurrence:

Unit 1 8 97%

Unit 2 8 98%

Unit 3 8 99%

Action specified in the Technical Specification Surveil.'ance Requirements met Sump pumps locked out until flow transmitter returned to service.

~Ayarent Causa of Occurrence:

Cause of zero shift unknown.

Anal sis 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 public.

Corrective Action

The tran'smitter was replaced and loop calibrated.

Failure Data:

BFRO-50-259/73007

~Retention:

criod - Lifetime; Responsibility - Admn>istrative Supervisor

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