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AO 75-29:on 751027,torus drywell vacuum breakers alarm sys II failed to annunciate when vacuum breaker V-26-8 opened. Caused by sticking microswitch.W/751106 ltr.

Accession Number: ML20090D063

Date Released: Monday, April 13, 2020

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• ML20090D060 - AO 75-29:on 751027,torus drywell vacuum breakers alarm sys II failed to annunciate when vacuum breaker V-26-8 opened. Caused by sticking microswitch.W/751106 ltr. (3 page(s), 11/6/1975)
• ML20090D076 - AO 75-29:on 751027,torus to drywell vacuum breaker alarm sys II failed to annunciate when vacuum breaker V-26-8 opened.Caused by component failure.Corrective action under investigation.W/751028 ltr. (3 page(s), 10/28/1975)