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Forwards addl info re loss of offsite power,in response to NRC 790925 ltr.Includes sketch of offsite power feeds & ROs 50-219/77-17-3L,50-219/78-03/03L-0,50-219/78-14/3L-0, 50-219/74/17,50-219/78-10/1T-0 & AO 73-19.

Accession Number: ML19291C260

Date Released: Friday, November 1, 2019

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• ML19291C259 - Forwards addl info re loss of offsite power,in response to NRC 790925 ltr.Includes sketch of offsite power feeds & ROs 50-219/77-17-3L,50-219/78-03/03L-0,50-219/78-14/3L-0, 50-219/74/17,50-219/78-10/1T-0 & AO 73-19. (3 page(s), 1/18/1980)
• ML19291C264 - AO 73-19:when closing signal was applied to breaker S1A,loss of power occurred at 4160-volt ac bus 1A causing trip of various pumps.Caused by incorrect setting of current transformer ratio matching taps.Taps set properly. (5 page(s), 9/8/1975)
• ML19291C266 - RO 50-219/77-17-3L:on 770728,bus C lost power when breakers 1C & EC opened due to activation of relays.Cause unknown. Breaker EC closed & megger readings retaken.Current transformers inspected.Relay wiring checked. (4 page(s), 8/26/1977)
• ML19291C270 - RO 50-219/78-03/3L-0:on 780214,startup transformer lockout 865A alarm annunciated in control room.Caused by fault in cable.Cable standoffs inspected,cleaned & varnished. Evaluation being performed on cable. (3 page(s), 3/15/1978)
• ML19291C277 - RO 50-219/78-14/3L-0:on 780824,during plant shutdown,power sources for auxiliary electrical power sys did not meet reactor power operation requirements,causing breakers to trip.Cause under investigation. (3 page(s), 9/22/1978)
• ML19291C282 - AO 50-219/74/17:on 740307,during transfer of power from auxiliary to startup transformer,closing switch for breaker S1B would not operate.Caused by component failure of closing spring not being in charged position. (3 page(s), 3/15/1974)
• ML19291C283 - RO 50-219/78-10/1T-0:on 780607,during sys checkout,breaker permissive switch for breaker S1B found in trip position. Switching orders did not specify placing permissive switch back to normal after 780221 trip. (4 page(s), 6/23/1978)