ML20086D593

Final AO 72-16:on 721220,fan 1 on West Cooling Tower Tripped.Caused by Failure of Motor Overload Heater.Overload Heater Replaced & Fan Returned to Svc

ML20086D593
Person / Time
Site:	Vermont Yankee
Issue date:	12/28/1972
From:	Rosalyn Jones VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086D587	List: ML20086D590 ML20086D593 ML20086D596
References
AO-72-16, VYV-2391, NUDOCS 8312020414
Download: ML20086D593 (1)

Text

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VERMONT YANKEE NUCLEAR POWER CORPORATION

= SEVENTY SEVEN OROVC STRCCT RUTLAND, VERMONT 05701 REPLY TO:

) VYV-2391 P. O. BOX 157 VERNON, VERMONT o5354 4

December 28, 1972

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's Director O Q Il

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Directorate of Licensing h (( 3 .,

U.S. Atomic Energy Commission '1

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Washington, D.C. 20545

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REFERENCE:

Operating License DPR-28 .d ,

$ Docket No. 50-271 'M - " .

l Abnormal Occurrence No. A0-72-16 \hig ~

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Dear Sir:

j As defined by Technical Specifications for the Vermont Yankee Nuclear

Power Station, Section 6.7.B.d, we are reporting the following Abnornal 1 Occurrence as A0-72-16.

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) At 1938 on December 20, 1972 the No. 1 fan on the west cooling tower i tripped. The fan failed after approximately a seven minute run in the reverse direction during deicing operations on the west tower. This

! particular fan and associated cooling tower cell are necessary to the

} cooling tower portion of the Alternate Cooling System and must be operable j whenever irradiated fuel is in the reactor vessel and reactor. coolant 1 temperature is greater than 212*F as required by section 3.5.D.'l of

} Technical Specifications. The reactor was operating at approximately l 60% power at the time of the incident.

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! Inmediately after the failure both diesels and both service water d

sub-systems were checked for operability in compliance with Technical Specifications section 4.5.D.3, and found to be. satisfactory.

g g Investigation showed that the motor overload heater had failed,

• 'j thereby severing power to the fan motor. The overload heate,r was g

replaced and the fan was returned to service on December 21. The fan has been operating without incident since the repair and the Plant Operations-Review Committee concluded that no further action is necessary.

jg LN . Very truly yours,- $D 'p 83220po414 730905 VE ONT YANKEE NUCLEAR POWER COPJ' ORATION

$DRh OCK 05000271 l, -

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Robert F. Jor s l

Plant SuperintendefpFY SENT REGION ~w- o

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