ML20151C225

AO 13-75:on 750523,locknut on MO/7053 Found Loose.Caused by Design Deficiency.Locknut Tightened & Staked to Drive Sleeve.Investigation in Progress to Determine Other Corrective Measures

ML20151C225
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	05/24/1975
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-13-75, NUDOCS 8103110741
Download: ML20151C225 (2)

Text

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THIS TWX IS TO CONFIRM AN EVENT REPORTED BY TELEPHONE D E DE HOOR ( ;

TO O KILEY AT 1500 HOURS ON HAY _23, 1975 l

1. REPORT NO - A0-13-75 DOCKET 155 (

2A. REPORT DATE ,MAY 23, 1975 26 OCCURRENCE DATE - MAY 2 3', 1975 C

3 FACILITY- BIG ROCK POINT PLANT 4 IDENTIFICATION OF OCCURRENCE- EME'RGENCY CONDENSER OUTLET VALVE OPERATOR LOCKNUT LOOSE.

5 CON 01TIONS PRIOR TO OCCURRENCE- PLANT IN COLD SHUTDOWN.

6 DESCRIPTION OF OCCURRENCE- FOLLOWING SIHILAR FAILURES OF LOCKNUT ,

ON OTHER VALVES OF THE SAME MANUFACTURER - A0-12-75 ON MAY 21, 1975 THIS VALVE WAS.BEING INSPECTED TO DETERMINE IF A SIMILAR CONDITION t EXIS1ED ON THE OPERAT04 DRIVE HECHANISM. THE LOCKNUT ON M0/7053 WAS (

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'FOUND LUDSE AND WAS TIGHTENED AND.SiAKED ON MAY 23, 1975,

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7. DESIGNATI0h 0F APPARENT CAUSE OF OCCURRENCE- DESIGN

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i B. ANALYSIS OF OCCURRENCE- THE VALVE DID NOT FAIL TO OPERATE AND 0 0 3 // W / 4

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[ j THUS NO MAZAw0 EXISTED, A HYPOTHETICAL FAILURE WOULD PREVENT ONE OF TWO LOOPS OF THE EMERGENCY TO BE OPERABLE DURING AN OVERPRESSURE C t> OCCURRLNCE.

9 CORRECTIVE ACTION- THE LOCKING NUT WAS TIGHTENED AND STAKE 0 TO i-INVESTIGATION IS IN PROGRESS TO DETERMINE IF OTHER C ,

r THE uRIVE SLEEVE.

COPRECTIVE MEASURES ARE NECESSARY.

FAILURE DATA- MANUAFCTURED BY PMILADELPHIA GEAR

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