17 juin 2013
Mise à l’arrêt du réacteur suite à l’indisponibilité de nombreuses alimentations électriques de sécurité. Ces alimentations étaient indirectement indisponibles suite à un problème sur le système de refroidissement de leurs armoires électriques.
1ère divergence mai 1985 – Type PWR - P : 1 195 MWe
Available in english only.
Facility : WOLF CREEK - 4 State : KS - Unit : [1] - Type : [1] W-4-LP -
Event Date : 06/17/2013 - Event Time : 11:11
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS
Initial PWR : 100 % - Current PWR : 55 %
Event Text
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO NON-FUNCTIONAL CLASS 1E ELECTRICAL A/C UNIT
"Class 1E A/C Unit SGK05A cools safety related electrical train ’A’ and was declared non-functional at 11 11 hours. As a result, the following supported safety related electrical equipment was declared inoperable : 4.16 KV Bus NB01, 480 volt Buses NG01 and NG03, 120 volt Instrument AC Inverters and Buses NN11, NN13, NN01 and NN03, 125 VDC Chargers and Buses NK11, NK13, NK01 and NK03. T/S 3.0.3 was entered from T/S 3.8.7 due to two out of four 120 volt AC Inverters (NN11 and NN13) being inoperable. All electrical systems listed above remain available but are declared inoperable due to inadequate room cooling capability. Plant shutdown to mode 5 commenced at 11 25 hours. No major equipment is out-of-service. All systems have functioned normally. Plant is currently at 55% power ramping down. Plant must be in mode 3 by 1811 CDT. No compensatory measures have been established.
"The NRC Resident Inspector has been notified. "
Event Number : 49126
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130618en.html#en49126
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