05000260/LER-1981-020-03, /03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51

/03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51

ML20004C650
Person / Time
Site:	Browns Ferry
Issue date:	05/29/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004C645	List: 05000260/LER-1981-020, Forwards LER 81-020/03L-0 05000260/LER-1981-020-03, /03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51
References
LER-81-020-03L-01, LER-81-20-3L-1, NUDOCS 8106040388
Download: ML20004C650 (2)

LER-1981-020, /03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51

Event date:
Report date:
2601981020R03 - NRC Website

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4 EVENT OESCalPTION AND PRO 9ABLE CONSEQUENCES h) l During normal operation, while performing the CSCS supprussion chamber high level l

Io t :l level switches LS73-57A and LS73-57B operated at correct l l surveillance instruction, [u;ij There was no danger to Lhe i i sett g t, but annunciator and relays failed to operate.

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. Tennessee Valley Authority Form BF-17

' Browns Ferry Nuclear Plant

- B F 15 'l 3/24/81 LER SUPPLE'4 ENTAL INFORMATION

- BFRO-50 260 / sio20

. Technical Specification Involved

' table 4.2.B Reported Under TechnicalLSpecification' 6.7.2.b-(2)

Date of Occurrence 5/5/81 Time of Occurrence 0800

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2 Unit

' Identification and Description of-Occurrence:

Suppression chamber levul switches LS73-57A and LS73-57B operated'at correct setpoint, but annunciator and relays failed to operate.

Conditions Prior to' Occurrence:

Unit i refueling outage.

Unit 2 at 100%

Unit 3 at 100%

Action specified in the Technical Specification Surveillance Requirements met-due to inopervble~ equipment. Descrioe.

Notified maintenance personnel and the relay was replaced.

Agreat -Cause of Occurrence:

Rc'.ay 23AK51 failed.

Analysis cf Occurrence:

There was no danger to the health or saiety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant

. chain of events.

Corrective Action

. Replaced component and tested successfully.

Failure Data:

None

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• Retention : Period - Lifetime; Responsibility - Document Control Supervisor

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