ML20151C225
| 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: |
| References | |
| AO-13-75, NUDOCS 8103110741 | |
| Download: ML20151C225 (2) | |
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C THIS TWX IS TO CONFIRM AN EVENT REPORTED BY TELEPHONE D E DE HOOR
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TO O KILEY AT 1500 HOURS ON HAY _23, 1975 1.
REPORT NO - A0-13-75 DOCKET 155
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2A. REPORT DATE,MAY 23, 1975 26 OCCURRENCE DATE - MAY 2 3',
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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 A0-12-75 ON MAY 21, 1975 ON OTHER VALVES OF THE SAME MANUFACTURER 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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DESIGNATI0h 0F APPARENT CAUSE OF OCCURRENCE-DESIGN
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ANALYSIS OF OCCURRENCE-THE VALVE DID NOT FAIL TO OPERATE AND 0 0 3 // W /
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THUS NO MAZAw0 EXISTED, A HYPOTHETICAL FAILURE WOULD PREVENT ONE j
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OF TWO LOOPS OF THE EMERGENCY TO BE OPERABLE DURING AN OVERPRESSURE C
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OCCURRLNCE.
i-9 CORRECTIVE ACTION-THE LOCKING NUT WAS TIGHTENED AND STAKE 0 TO THE uRIVE SLEEVE.
INVESTIGATION IS IN PROGRESS TO DETERMINE IF OTHER C
r COPRECTIVE MEASURES ARE NECESSARY.
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i 10 FAILURE DATA-MANUAFCTURED BY PMILADELPHIA GEAR TORQUE MODEL SMA-00, 7
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