ML20086D892

AO 73-02:on 730115,fan 1 on West Cooling Tower Failed in Forward Direction After Completion of Deicing Cycle.Caused by Bearing Failure in Reduction Gear Unit.Repair & Return to Normal Operation of Fan Expected by 730122

ML20086D892
Person / Time
Site:	Vermont Yankee
Issue date:	01/15/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D889	List: ML20086D886 ML20086D892
References
AO-73-02, AO-73-2, VYV-2408, NUDOCS 8312050323
Download: ML20086D892 (1)

Text

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January.15;.1973 .

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United States Atomic Energy Commaission .

Direc'terate of Regulatory Operations Region I .

970 Btoad Street- d Womerk, New Jersey. 07102'.

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• • REFERENCEt. Operating License DPR Docket.M0. 50-271s - -

Abnormal Occurrence No.-AO-73-02r Gentlemen

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As defined'by Technical Specifications for the Vermont' Yankee Nuclear Power Station, Section 6.7.A.c, we are repotting the following Abnornsi' .

i occurrence as A0-73-01'and confirming'our teleph'ne o conversation with your

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office.

At 0415 on January 15, 1973.' the No.' l' fen on the west cooling, tower- i failed in the forward direction 'after completion of the deicing . cycle.r This - l particular fan and as,sociated' cooling tower cell are necessary.to.the cooling tower portion of the' Alternate Cdoling System and wust'be operable'whenever '

irradiated fuel fa in the reactor vessel and' reactor coolant temperature is' greater than 212'F as required by section 3.5.D'.T of Technical Specifications.

The reactor was operating at~ approximately.100% ' power at the time of tthe e incident ~. .

After the failure, the diesels and'the service water sub-systems were checked for operability in compliance with' Technical" Specifications section 4.5.D.3, and found'to be satisfactory. This operability demonstration will be performed daily until repair is affected.

Initial investigation showed that there was a bearing failure in the I reduction gear unit. Repair and return to normal' operation of the fan will be complete prior to January 22, 1973; It should'ba noted that the cell is currently in operation in the natural convection mode. ,

Very :truly ypuro6 VERENT YANKEE NUCGAR POWER CORPORATION.

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