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Reviews Rept DC-26 re 681218-19 emergency power failures. Most probable cause is combination of equipment malfunctions in area of diesel & generator control,compounded by operator error.

Accession Number: ML20090D951

Date Released: Saturday, October 26, 2024

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• ML20090D949 - Reviews Rept DC-26 re 681218-19 emergency power failures. Most probable cause is combination of equipment malfunctions in area of diesel & generator control,compounded by operator error. (2 page(s), 1/13/1969)
• ML20090D954 - Submits info re simultaneous loss of all offsite power,per 680527 request. (2 page(s), 5/28/1968)
• ML20090D957 - Inquiry Memorandum 50-213/68C re 680427 loss of offsite power.Stuck breaker relay scheme will be reviewed by utils, dispatching company & designers of facility.Results should be available by Jul 1968. (3 page(s), 5/10/1968)
• ML20090D959 - Summary of 681029 meeting w/applicant re common mode failure of all three diesel generators during heat removal operations.Incident supports argument in favor of independence among emergency ac power supplies & buses. (2 page(s), 11/4/1968)
• ML20090D963 - Forwards rept re 680427 loss of all external ac power sources.Concurrence & reproduction as info paper requested. (3 page(s), 5/20/1968)
• ML20090D980 - Updated RO:on 680427,loss of offsite power experienced. Caused by procedural error in switching to restore outside 115-kV lines to svc.Test results confirm that generators did trip on reverse power. (4 page(s), 5/21/1969)