05000296/LER-1981-051-03, /03L-0:on 810925,during Normal Operation,Coupling Came Apart on 3EA Reactor Motor Operated Valve Board Motor Generator Set.Caused by Slippage of Retainer Ring.Ring Replaced

/03L-0:on 810925,during Normal Operation,Coupling Came Apart on 3EA Reactor Motor Operated Valve Board Motor Generator Set.Caused by Slippage of Retainer Ring.Ring Replaced

ML20011A611
Person / Time
Site:	Browns Ferry
Issue date:	10/23/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A604	List: 05000296/LER-1981-051, Forwards LER 81-051/03L-0 05000296/LER-1981-051-03, /03L-0:on 810925,during Normal Operation,Coupling Came Apart on 3EA Reactor Motor Operated Valve Board Motor Generator Set.Caused by Slippage of Retainer Ring.Ring Replaced
References
LER-81-051-03L-02, LER-81-51-3L-2, NUDOCS 8110290179
Download: ML20011A611 (2)

LER-1981-051, /03L-0:on 810925,during Normal Operation,Coupling Came Apart on 3EA Reactor Motor Operated Valve Board Motor Generator Set.Caused by Slippage of Retainer Ring.Ring Replaced

Event date:
Report date:
2961981051R03 - NRC Website

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6/04/81-LER SUPPLDIENTAL INFORMATION-I DFRO 296 ~ / 81051 _ Technical Specification Involved -

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. Date of. Occurrence 9/25/81 Time of Occurrence.

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.I I'ientification and Description ~of Occurrence:

Coupling came apart on 3EA reactor MOV board MG set due to slippage' of. retainer ring.

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.I Conditions Prior to Occurrence:

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Unit 1 in refueling outage.

Unit 2 at 98%.

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Unit 3 at 97%.

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Action specified in the Technical Specification Surveillance Requirements met

_due to inoperabic equipment.

Describe.

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I Apparent Cause of Occurrence:

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Coupling came apart due to slippage of the retainer ring. The retainer ring

. was apparently deformed during installation.

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_ Analysis of Occurrence:

There was no danger to the health or safety of the public, no. release of activity,-

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no damage to the plant or equipment, and no resulting significant. chain of events.

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_ Corrective Action:

The old retainer-ring was replaced by a new one, and the coupling reassembled and lubricated. This is considered a random failure due to a slightly' deformed retainer ring, and no further recurrence control is required.-

Failure Data:

BFRO-50-296/81050.

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• Retention:

Perio'd - Lifetime;' Responsibility - Document Control Supervisor

• Revision :

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