ML20127L147

RO 75-12:on 750429,surveillance Test for Exercising Unit 2 Containment Vacuum Breaker Isolation Valve CV-31628 Showed Valve to Be Inoperable

ML20127L147
Person / Time
Site:	Monticello
Issue date:	05/01/1975
From:	Tierney F NORTHERN STATES POWER CO.
To:	Choules N, James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
75-12, NUDOCS 9211230436
Download: ML20127L147 (1)

Text

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, N 0 R T M'E R N: S T A;T E S - P O M'E R , 9OMPAMT 7 l-PRAIA1E 18MNb NUCLRAR ORNERATING PLANT s+

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May 1,1975 4 -

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, (,- 1 Mr. James 0. Keppler, Director -

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s Region 11.1 Office.of inopoetion and Enforcement '

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i-D' US Hvelaar Regulatery Commiesson-799 Roomovelt Road .

" ', V, Olen Ellyn, IL 60137 -

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ATnt: Mr. N C Chowles

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,, REPORP.0F AbHORMAL CCCURRENCE NO. 75-12 ..

At 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> on Apiil 29, 1975', the surveillance test for exercising Unit 2 centalement Vacuum breaker. ! solation Vatys cur 31626 showed the '

, valve to be inoperable in that it would-not close. .

Maintenance work was initiated and the valve wap returned to an -

operable status by 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on April 29th.

,y P P Tierney, Jr.

Plant Manager Prairie Island Nuclear Plant .

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