ML20151C228

AO 14-75:on 750526,excessive Leakage Noted During Monthly Containment Ventilation Supply Valve Leak Test.Cause Not Known.Test Terminated & Reported to Plant Mgt.Investigation in Progress

ML20151C228
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	05/28/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20151C218	List: ML20151C215 ML20151C220 ML20151C225 ML20151C228 ML20151C230
References
AO-14-75, NUDOCS 8103110745
Download: ML20151C228 (2)

Text

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THIS Ti.,X IS SUBMITTED TO CONFIRM INFORMATION REPORTED BY TELEPHONE, D E DE MOOR TO E JORDAN ON MAY 27, 1975,

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1. REPORT NO- A0-14-75 ,

DOCKET 50-155 2A. REPORT DATE- MAY 27, 1975

$F 1201 (RS-69)

28. OCCURRENCE DATE- t!AY 26, 1975

3. FACILITY- BIG ROCK POINT PLANT  :

4. IDENTIFICATION OF OCCURRENCE- CONTAINNENT VENTILATION SUPPLY ,

VALVE LEAK TEST ESCESSIVE. ,

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CONDITION PRIOR TO OCCURRENCE- PLANT IN C0'LD SHUIDOWN 'FOR 5 '.

MODIFICATION ACTIVITY ASSOCIATED WITH A0-1-75. ~

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K 6. , DFSCRIPTION.0F OCCURRENCE- DURING A SPECIAL MONTHLY TEST OF THE .

< VENTILATION VALVE LEAK RATE, F.XCESSIVE LEAKAGE WAS NOTEL DURIN3 THE TEST B ASED ON PRESSURE G AU3E READIt'3S. THE SPECIAL TEST VAS

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BEING CONDUCTED TO VERIFY CORRECTIVE ACTION THAT WAS APPLIED AS e

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J A RESULT OF A0-8-75 DESCRIBED IN OUR LETTER OF MARCH 51, 1975. l t-  ?,

7. DESIGNATION OF APPAREllT CAUSE OF OCCURRENCE- EXACT CAUSE IS Ut!- r KNOVN, BUT CONDITIONS ARE SIMILAR 'TO THOSE IN A0-8-75 AS OF 1HIS DATE. '

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8. ANALYSIS OF OCCURRENCE- INVESITGATION IS IN PROGRESS. PREVIO US ,

FAILIDE VAS ASSOCIATED WITH CV/4097 ONLY, WHICH IS ONE OF TVO

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VALVES IN SERIES AND WOULD NOT REPRESENT A BREACH OF CONTAllt:ENT NOR AN UNDUE HAZARD .IN VIEW OF THE ISOLATION DESIGN.

9. CORRECTIVE ACTIOil- TEST VAS TERMINATED AND REPORTED TO PLANT e

N AN AG Ei!ENT. INVESTIG ATION IS IN PRO 3RESS VITH PLAi)T IN COLD

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10. FAILURE DATA- REFERENCE A0-8-75 0F MARCH 51, 1975. C l R B SEVELL l

j NUCLEAR LICENSING ADMINISTRATOR

' CONSUMERS POVER COMPANY CBV.,^ .

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