05000272/LER-1979-077, Supplemental LER 79-077/03X-1:on 791224,during Startup operations,11ASD Breaker tripped,de-energizing 1A 4 Kv Vital Bus & Supplied Plant Loads.Caused by Failed Components. Logic Drawer & Relay Replaced

Supplemental LER 79-077/03X-1:on 791224,during Startup operations,11ASD Breaker tripped,de-energizing 1A 4 Kv Vital Bus & Supplied Plant Loads.Caused by Failed Components. Logic Drawer & Relay Replaced

ML18081B115
Person / Time
Site:	Salem
Issue date:	02/22/1980
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081B114	List: 05000272/LER-1979-077, Supplemental LER 79-077/03X-1:on 791224,during Startup operations,11ASD Breaker tripped,de-energizing 1A 4 Kv Vital Bus & Supplied Plant Loads.Caused by Failed Components. Logic Drawer & Relay Replaced
References
LER-79-077-03X, LER-79-77-3X, NUDOCS 8002260612
Download: ML18081B115 (1)

LER-1979-077, Supplemental LER 79-077/03X-1:on 791224,during Startup operations,11ASD Breaker tripped,de-energizing 1A 4 Kv Vital Bus & Supplied Plant Loads.Caused by Failed Components. Logic Drawer & Relay Replaced

Event date:
Report date:
2721979077R00 - NRC Website

text

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- LICENSEE EVENT REPORT U. ~~CLEAR REGULATURV COMMISSION

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[)))) I During startup operations, the llASD breaker tripped, de-energizing the lA 4kV C£lII I vital bus and supplied plant loads.

The lA SEC panel was reset and the llASD

[]J!] I breaker was reclosed.

Maintenance electricians declared the lA SEC inoperable and

£II[J I Action Statements for T/S 3.8.1.1 and 3.3.2.1 were implemented.

The lA SEC was

[]J[} I repaired, tested and returned to service in 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> and 16 minutes.

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44 47 [I))] I Failed components in the logic circuit led to an erroneous start of a Mode II operation.

When the diesel breaker did not receive a signal to close, the sequence was aborted.

The entire logic drawer was replaced to expedite recovery IJJ]J I of the lA SEC.

Further troubleshooting of the failed drawer resulted in five [JJ3] ~l--'l_o_g.i-*c;;,_b_o.;;..;;;;a_r~d-s_..a_n_d.__o_n_e--'r_e_l_a_y.._b-.....e_i_n_q __

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