ML20086E222

AO 75-05:on 750220,sample Accumulator Isolation Valve to Condenser OG-9069 Found Shut,Rendering Radiation Monitors Inoperable.Cause Not Stated.Valve Immediately Opened

ML20086E222
Person / Time
Site:	Vermont Yankee
Issue date:	02/21/1975
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-75-05, AO-75-5, VYV-3724, NUDOCS 8312060431
Download: ML20086E222 (1)

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[ VERMONT YANKmm NUCLEAR POWER CORPOR A' PION OCVCNTY O tW CN OMOVESTRCCY RUTI.Aau, Vt,.umour osvoi -

VYV--3724 P. o. cox ss7 VERHON. /ERMOM &: m February 6, 7.975 ..

N r' i Unitad States Nuclear Regulatory Conniccion . . .,.'"\ 9 ' .

Of fice of Inapection cad Enforccmonc 'p. .Q , .

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I:ing of Prussia, Ponnay1vania 19406 w w-i;w i 3Jg NiTENTION: Jacce P. O'Roilly, Director @#3-%*1.1 g. . %. -

j_r N Dodot No. 50-271 Abaormal occurrence No. A0-75-05 (2411our Report) M 3 ,

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Ao defined by Technical Specifications for the Vermonc Ycnkee Q ,g Nuclear Power station, Section 6.7, we are reporting the following  %,; ;y f;'.

Abnormal Occurrence as A0-75-05 and conficcing our tolophone conversation c.3.. f $y; with your of fico. .

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At approximately 1000 on February 20, 1975, during plant rover ). 3 oncennion, it was diocovered that the Sample Amaulator Isolation _ Valve .'d,[

to the condencor, 0C--9059, was shut. This caused all flow pact the c Augroanted Of f-Csa (AUG)~rediation monitors to be blocked, thereby making b} 0,9c theno monitoro inoperabic. Section 3. 9.B. 2.d o f the Technical Specifications ,y .

requires that at least one of the tuo radiation monitoring syntetus betuca.n ~.$ 5:l%

the recot:.bince and the first charcoal bed shall be operable during the f'g .Q operation of the A0G Syntein. Valve 00-9069 was shut during the plant '

,J' outage which coir.c:enced on February 14, 1975, to facilitate maintenance work J(c;k.Y.'

that was botng perfornud.

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Upon diccovery, valvo OG-9069 was icredictoly pinced in the open . %,MA: s.w.4p ponition, thereby making the monitora fully operablo. The plant was opurating at 42% power at the citre of discovery. The secam jet air f.].p],

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ejector ratdiation monitors and the plant att.ck radiation monitors were operablo and in service when the AOG System was in service. - - }.%. ' :

4upu $w x Very truly yours, l;;jg kk9 0

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.. N Bradford W. Riley d ". , ' 1 .

Plant Superintendent JO no F.,

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