05000259/LER-1981-024-03, /03L-0:on 810518,train C to Flow Switch for Standby Gas Treatment Sys Was Found Inoperable During Calibr of Switches.Caused by Electronic Failure of Dwyer Photohelic Pressure Switch.Switch Replaced

/03L-0:on 810518,train C to Flow Switch for Standby Gas Treatment Sys Was Found Inoperable During Calibr of Switches.Caused by Electronic Failure of Dwyer Photohelic Pressure Switch.Switch Replaced

ML19350F064
Person / Time
Site:	Browns Ferry
Issue date:	06/17/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350F062	List: 05000259/LER-1981-024, Forwards LER 81-024/03L-0 05000259/LER-1981-024-03, /03L-0:on 810518,train C to Flow Switch for Standby Gas Treatment Sys Was Found Inoperable During Calibr of Switches.Caused by Electronic Failure of Dwyer Photohelic Pressure Switch.Switch Replaced
References
LER-81-024-03L-02, LER-81-24-3L-2, NUDOCS 8106240154
Download: ML19350F064 (2)

LER-1981-024, /03L-0:on 810518,train C to Flow Switch for Standby Gas Treatment Sys Was Found Inoperable During Calibr of Switches.Caused by Electronic Failure of Dwyer Photohelic Pressure Switch.Switch Replaced

Event date:
Report date:
2591981024R03 - NRC Website

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EVfNT DESCptPTION AND pro 8A8LE CONSEQUENCE During refueling outage, whi e performing calibration of flow switches l

O, 1 for standby gas treatment system (SI 4.2.A-13), train "C" was found p; 771 g inoperable. The standby gas treatment system is common to units 1, 2, I

and 3.

There was no danger to the health or safety of the public.

g, Redundant trains "A" and "B" were available and proven operable, f

O s 1 Previous similar event: BFRO-50-259/81004.

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40 46 43 43 es es CAUSE DESCRIPTION AND CORRECDVE ACTIONS i o I A Dwyer photohelic pressure switch model 3000-0 LRT failed electronica11vt I

The switch was replaced and train "C" was functionally tested and r

gi returned to service. Component failure is con idered random r.td no further recurrence control is required.

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8106240/59

Farm BF-17 BF 15.2 3/24/81 LER SUPPLEMENTAL INFORMATION BFRO 259 /

81024 Technical Specification Involved 3.7.s.1 R'eported Under Technical Specification 6 7.2.h(2)

Date of Occurrence 5/18/81 Time of Occurrence __1400

- Unit 1.

2.

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Identificati,n and Description of _0ccurrence:

FIS65-70a switch failed Cond',tions Prior to Occurrence:

Unit I refueling outage Unit 2 at 99%

Unit 3 at 99%

Action specified in the Technical Specification Surveillance Requirements met due to inoperab*e equipment. Describe.

Operability requirements o.f T.S. were met.

Apparent Cause of Occurrence:

Electronic failure of switch FIS65-70a.

Analysis of Occurrence:

There were no danger to the health or safety of the public, no release of activity, no damage'to the plant or equipment, and no resulting significant chain of events.

Corrective Action

l Switch FIS65-70a was replaced and train "C" was functionally tested and l

returned to service.

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l Failure Data:

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BERO-50-259/81004.

• Retention: Period - Lifetime;. Responsibility - Administrativc Supervisor l

• Revision:

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