14 décembre 2013
Des analyses sur le diesel de secours d’urgence du réacteur n° 1 ont démontré l’insuffisance de son refroidissement dans certaines conditions météorologiques. Des mesures spéciales, complémentaires à celles prévues dans les procédures, seront à mettre en œuvre, comme l’ouverture des portes du local diesel.
Type : PWR - Puissance : 3 411 MWTh - Première divergence - 04 1984
Available in english only.
Event Number : 49634 - Facility : DIABLO CANYON - State : CA
Unit : [1] : RX Type : [1] W-4-LP-
Event Date : 12/14/2013 - Event Time : 15:03
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION Person (Organization) : GREG WERNER (R4DO)
Initial PWR : 100 % - Current PWR : 100 %
Event Text UNANALYZED CONDITION AFFECTING UNIT 1 EMERGENCY DIESEL GENERATOR
"At 1503 PST on December 14, 2013, Pacific Gas and Electric Company identified that, if atmospheric conditions were to develop that had both sustained high winds exceeding 60 miles per hour from the NW to NNE direction, and ambient air temperature exceeding 97 degrees Fahrenheit, the combination of these conditions could result in inadequate heat removal to support continuous operation of the Unit 1 emergency diesel generators. Upon identification of this condition, shift orders were issued requiring implementation of existing procedural guidance to open plant doors to allow additional air flow that would provide adequate emergency diesel generator cooling to support continuous operation of the U1 emergency diesel generators.
"This report addresses a condition as described in 10 CFR 50.72(b)(3)(ii)(B).
"The NRC Resident Inspector has been notified of this condition."
This condition was discovered during a license basis verification review.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20131216en.html
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