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Discusses two incidents that occurred at power plant that indicated deficiency in control circuit design.Requests that licensee perform review of control circuits of safety- related equipment.

Accession Number: ML20037B519

Date Released: Friday, October 25, 2024

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• ML20037B518 - Discusses two incidents that occurred at power plant that indicated deficiency in control circuit design.Requests that licensee perform review of control circuits of safety- related equipment. (2 page(s), 12/22/1972)
• ML20037B520 - RO:on 720411,during surveillance test of isolation,supply dampers for reactor bldg ventilation sys failed to close. Caused by supply & exhaust fans trip.Circuit design change implemented. (2 page(s), 4/20/1972)
• ML20037B521 - RO:on 720926,util discovered that two pumps in standby liquid control sys were inoperable at same time.Caused by breaker for pump A being racked out.Operating procedures changed. (2 page(s), 10/6/1972)