ML20086H457

Telecopy Ao:On 720406,standby Gas Treatment Sys Fan a Failed to Start.Thermal Overloads Changed from 41 to 44.Repeated Starts Performed for 4 H W/O Failures

ML20086H457
Person / Time
Site:	Vermont Yankee
Issue date:	04/07/1972
From:	Lawyer L VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086H450	List: ML20086H449 ML20086H457
References
NUDOCS 8401170166
Download: ML20086H457 (2)

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1115P EST APR 7. 72 PB003 KA604 .I K CVA353 PD VERNON VERMONT 7 NFT ,

US ATOMIC ENERGY COMM DIRECTOR _ DIVN OF COMPLI ANCE ,

REGION ONE 970 BROAD ST NEWARK NJER .

THIS WILL CONFIRM CONVERSATION AT 1510 HOURS THIS DATE WITH R A FIEL OF REGION ONE COMPLIA' ICE REGARDING A FAILURE OF SGTS FAN A TO START. AT 1615 HOURS .WITH THE RE ACTOR SHUT DOWN AND ,

UNDER THE CONDITION THAT NEITHER SECONDARY CONTAINMENT NOR JE STAND BY GAS TREATMENT SYSTEMS REQUIRED IN ACCORDANCE WITH TECH SPECS ON 4-6-72 A LOW WATER LEVEL SIGN AL-WAS INITI ATED ,

$ BY INSTRUMENTATION PERSONNEL WHILE PERFORMING MAINTENANCE WORK ^

[ ON INSTRUMENTATION RACK 25-5 SGTS FAN A DID NOT START. FAN ,. .

58 B STARTED AND REACTOR BUILDING VENTILATION ISOLATED AS REQUIRED. -

}$ 1620 HOURS REACTOR BUILDING VENTILATION SYSTEM WAS RETURNEJ S$ TO NORMAL ATTEMPTS TO MANUALLY START FAN A WERE UNSUCCESSFUL. _ _

I IN COURSE OF INVESTIGATION IMPOSED A DOWN SCALE TRIP ON REACTOR ,:

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BUILDING VENTILATION MONITOR SYSTEM. NEITHER SGTS FAN STARTED.

2147 THERMAL OVERLOADS IN SGTS FAN MOTORS A AND B CHANGED f FROM 41 TO 44 REPEATED ST ARTS ON EACH F AN WERE PERFCRMED WITH NO F AILURES 0200 4-7-72 SECURED FOUR HOUR . CONTINUOUS RUN FOR ~

BOTH SGTS FANS AGAIN NO FAILURES WERE NOTED  ;

L L L AWYER VERMONT YANKEE NUCLE AR POWER CORP PO BOX 157 VERNON x .!

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