18 septembre 2014
Lors de contrôle de circuits, il a été déterminé que des câbles dédiés à la turbine génératrice de courant continu, ainsi que la pompe à huile d’alimentation en urgence n’étaient pas protégés par fusibles. Ces câbles sont, de fait, susceptibles d’engendrer des départs de feu secondaires. Des mesures compensatoires ont été mises en place.
Type : PWR - Puissance : 3 565 MWth - Première divergence : 05/1985
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Event Number : 50468
Facility : WOLF CREEK - State : KS - Unit : [1] - RX Type : [1] W-4-LP
Event Date : 09/18/2014 - Event Time : 11:55 -
Last Update Date : 09/18/2014 Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Initial PWR : 100 % Current PWR : 100 %
Event Text
POSTULATED HOT SHORT FIRE EVENT THAT COULD ADVERSELY IMPACT SAFE SHUTDOWN EQUIPMENT
"During a review of INPO Event Report 14-33, Direct Current Circuits Challenge Appendix R Fire Analysis, it was determined that portions of the control circuits for the Turbine Generator DC Emergency Lube Oil Pump and the Emergency DC Seal Oil Pump are not properly fused to prevent overload and possible secondary fires. The review found that a fire at the motor starter cabinet in the turbine building could cause specific smart hot shorts that could cause overheating of the control cable and result in secondary fires outside the turbine building. Based on this information, it was determined that this condition is unanalyzed and is potentially reportable per 10 CFR 50.72(b)(3)(ii)(B).
"Hourly fire watch compensatory measures are in place in the affected areas of the Turbine Building. The presence of compensatory measures in addition to automatic fire detection and suppression in these fire areas ensures protection of the equipment."
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140919en.html#en50468
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