ML19347C759
| ML19347C759 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 12/16/1975 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| References | |
| NUDOCS 8102130093 | |
| Download: ML19347C759 (1) | |
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ABNORMAL OCCURRENCE REPORT Big Rock Point Plant 1.
Report No: A0-29-75, Docket 50-155 2a.
Report Date: December 16, 1975 2b.
Occurrence Date: December 6, 1975, Classified as A0 on December 9, 1975 3
Facility: Big Rock Point Plant, Charlevoix, Michigan h.
Identification of Occurrence: Failure of piping component in control rod drive pump No 1 discharge piping.
5 Conditions During Occurrence: Plant shut down for minor repairs and rou-tine testing.
6.
Description of Occurrence: A through wall water leak was observed in a threaded 1" Schedule 160 pipe nipple at the inlet to the pump discharge relief valve on the No 1 system. The unit was immediately removed from service and the No 2 pump was immediately put in service. Maintenance was notified to investigate and repair.
7 Designation of Apparent Cause of Occurrence: Unknown. Probable cause is vibration induced fatigue. A metallurgical examination will be conducted.
8.
Analysis of Occurrence: The pump system provides drive cooling water, scram accumulator charging energy and normal drive maneuvering powe" and these functions were not lost due to this deficiency.
9 Corrective Action: The pipe nipple and associated flange were replaced and satisfactorily tested prior to plant start-up on December 7, 1975 10.
Failure Data: One-inch carbon steel Schedule 160 pipe nipple.
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