05000311/LER-1981-028-03, /03L-0:on 810603,feeder Breaker 2B4D Tripped When Fan Coil Unit 24 Was Started.Caused by Design Error. Overcurrent Protection Relay Accommodated Only One Fan Cooling Unit.Relay Reset

/03L-0:on 810603,feeder Breaker 2B4D Tripped When Fan Coil Unit 24 Was Started.Caused by Design Error. Overcurrent Protection Relay Accommodated Only One Fan Cooling Unit.Relay Reset

ML20005B068
Person / Time
Site:	Salem
Issue date:	06/18/1981
From:	Espey J Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20005B065	List: 05000311/LER-1981-028, Forwards LER 81-028/03L-0.Detailed Event Analysis Encl 05000311/LER-1981-028-03, /03L-0:on 810603,feeder Breaker 2B4D Tripped When Fan Coil Unit 24 Was Started.Caused by Design Error. Overcurrent Protection Relay Accommodated Only One Fan Cooling Unit.Relay Reset
References
LER-81-028-03L, LER-81-28-3L, NUDOCS 8107060277
Download: ML20005B068 (1)

LER-1981-028, /03L-0:on 810603,feeder Breaker 2B4D Tripped When Fan Coil Unit 24 Was Started.Caused by Design Error. Overcurrent Protection Relay Accommodated Only One Fan Cooling Unit.Relay Reset

Event date:
Report date:
3111981028R03 - NRC Website

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g l During reactor trip, the starting of the second fan cooling unit energized from l

2B Vital Bus tripped the 4KV Feeder Breaker, 2B4D, de-energizing the 460/230 Volt l

gl gl 2B Vital Buses. Action Statements 3.8.2.la and 3.6.2.3a were entered at 0445 hours0.00515 days <br />0.124 hours <br />7.357804e-4 weeks <br />1.693225e-4 months <br /> l ITTil l and 0645 hours0.00747 days <br />0.179 hours <br />0.00107 weeks <br />2.454225e-4 months <br />, respectively, on June 3,1981.

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