05000259/LER-1981-025-01, /01T-0:on 810521,during Scheduled Refueling Outage Three Main Steam Relief Valves Failed to Actuate W/Required 1% of Set Pressure During Bench Test.Cause Unknown.Valves Adjusted & Correct Valve Operation Verified

/01T-0:on 810521,during Scheduled Refueling Outage Three Main Steam Relief Valves Failed to Actuate W/Required 1% of Set Pressure During Bench Test.Cause Unknown.Valves Adjusted & Correct Valve Operation Verified

ML20004D668
Person / Time
Site:	Browns Ferry
Issue date:	06/03/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004D662	List: 05000259/LER-1981-025, Forwards LER 81-025/01T-0 05000259/LER-1981-025-01, /01T-0:on 810521,during Scheduled Refueling Outage Three Main Steam Relief Valves Failed to Actuate W/Required 1% of Set Pressure During Bench Test.Cause Unknown.Valves Adjusted & Correct Valve Operation Verified
References
LER-81-025-01T, LER-81-25-1T, NUDOCS 8106090634
Download: ML20004D668 (2)

LER-1981-025, /01T-0:on 810521,during Scheduled Refueling Outage Three Main Steam Relief Valves Failed to Actuate W/Required 1% of Set Pressure During Bench Test.Cause Unknown.Valves Adjusted & Correct Valve Operation Verified

Event date:
Report date:
2591981025R01 - NRC Website

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259 / 81025 Technical Specification involved 4.6.D.1 Reported Under Technical Specification ___ _

6.7.2.A.1 Date of Occurrence 5/21/81 Time of Occurrence 1430 __ Unit 1

Identification and Descripntion of Occurrence:

During a bench test with the unit in a scheduled refueling outage, 3 main steam relief valves f ailed to actuate within the required 1% of set pressure. They are as follows:

, VALVE SN SET PRESSURE AS FOUND 1017 1115 1020 1060

• 1105 1118 1060

• 1105 11'.1 1060

• 1105 1119 1060

• 1105 1114 1070 1115 1154

• valve SN 1060 tested four times 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 inoperable equipment. Describe NA Apparent Cause of Occurrence Unknown At.inlyyic_ of Occurrence:

=se of There was no danger to the health or safety of the public, no rct activity, no damage to the plant or equipment, and no resulting #.g111ficant chain of events.

Corr _cetive Action:

The cause The valves were adjusted and the correct valve operation verified.

is being investigated by the manufacturer.

Failure Data:

BFRO-50-260/80040; 296/80054.

• lt e t en tior. :

Period - Lifetime; Responsibility - Document Control Supervisor

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