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AO 11-75:on 750520,during calibr of vacuum interlock switch PS/RE15B,setpoint found above Tech Specs limits.Caused by misapplication.Wide range switch used w/setpoint at extreme low end.Switch restrictive reset characteristic is limiting.

Accession Number: ML20151C218

Date Released: Monday, October 28, 2024

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• ML20151C215 - AO 11-75:on 750520,during calibr of vacuum interlock switch PS/RE15B,setpoint found above Tech Specs limits.Caused by misapplication.Wide range switch used w/setpoint at extreme low end.Switch restrictive reset characteristic is limiting. (2 page(s), 5/21/1975)
• ML20151C220 - AO 12-75:on 750521,excessive operator freeplay noted due to loose locknut on core spray valve operator.Caused by design deficiency.Locking nut tightened & staked w/pin punch to drive sleeve.Investigation in progress. (2 page(s), 5/23/1975)
• 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. (2 page(s), 5/24/1975)
• 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. (2 page(s), 5/28/1975)
• ML20151C230 - AO 15-75:on 750530,fuel pool & reactor drain valve CV/4027 found leaking during isolation valve integrity testing.Cause being investigated. (2 page(s), 5/30/1975)