ML20086E790

AO 74-01:on 740124,reactor Scrammed Due to Turbine Trip, Causing Automatic Closure of All But One Msiv.Cause of Valve 2-80C Failure Not Stated

ML20086E790
Person / Time
Site:	Vermont Yankee
Issue date:	01/25/1974
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086E784	List: ML20086E782 ML20086E790
References
AO-74-01, AO-74-1, VYV-3146, NUDOCS 8312070522
Download: ML20086E790 (1)

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.f 1 o'L K) Vicw MONT Y A NK EM NucL1cAu l'ow MR CON 1'ON ATioN MU GCVCtJ TY U CVC tJ Of tOVf* GTitt:GT Rt )TI. AND, Yld t M O NT 05701 VYV -3146 e+ r ror i ci s'. o. n o x i t,7 VLitf 40f d. VLtdMOt4T o:33 3'4 January 25, 1974 -

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Unit ed ';t at t : A t 0: 'c 1:nergy Cor:ilsnion ". t lif t ect orate of Regula tory Operations, Region 1 .

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631 Park Aveno"

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Abnorail Occurrence 1;o. A0-74-01 .'

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Gent J e:= n:

An defined by Tect.nical Speci fications for t.he Vernant Yankee

!;uclear Peeer Station, Section 6.7.B.1, we are report ing t he following Abnorrnal Occorrence .< A0-74-01.and conif ruing our t elophone convernation uith your office.

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A t. approxinately 2327 on January 24, 1974, uhile performing a L e t:1. annocialed with the plant startup tent. program, a reactor scram occurred an a renu]t of a turbine t ri p . Suhncquent. to the r:c t an, a prieary cor.t ain:;ent fro]ation signal van initiated cauning aut ouatic c]onure of the r.ain stean inolation valven. All valves cloned uith the exceptlon of valve 2-SOC. Thin condition van deterrJned t o be in violation of Technical Specifications, Section 1.A.S, in that it result ed in abnorraal degradation of one of the neveral boundarie:, which are designed to contain the radioactive materialf; renult ing f rom the fit.nion procens. The reactor van in l

.l n shut down condit f o:2 at the tine of thin incident.

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The io.mediat e program vill deternine the canne of the valve failure and apply corrective action prior to renuming plant operation.

I Very truly yot.rn, 8312070522 740131 .VElWONT YAt;KEE 1:UCL1:AR POUCR ConPORATION PDR ADOCK 05000271

-l B.U. Kiley ,/1 plant Superintendent ( \

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