30 juillet 2014
Des mesures compensatoires ont été mises en œuvre afin de restaurer la conformité aux exigences prévues lors de la conception... il y a 29 ans.
Type : BWR-MARK 3 - Puissance : 3091 MWth - Première divergence : 10/1985
Available in english only.
Event Number : 50324
Facility : RIVER BEND - 4 State : LA -
Unit : [1] RX Type : [1] GE-6
Event Date : 07/30/2014 - Event Time : 09:40
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Initial PWR : 100% - Current PWR : 100%
Event Text
ULTIMATE HEAT SINK IN AN UNANALYZED CONDITION
"On July 30, 2014, at [0940 CDT], with the plant operating at 100% power, a review of an engineering analysis of the ultimate heat sink (UHS) determined that the UHS had been in an unanalyzed condition that degraded plant safety. This condition was the result of a design basis deficiency for the UHS that did not account for the adverse effects of system leakage on compliance with the 30-day inventory required by Regulatory Guide 1.27. The system design basis requires that 30-day inventory be maintained, with the assumption that no replenishment of the UHS occurs for the entire duration of the postulated event.
"In support of the development of the engineering analysis, compensatory measures have been implemented which provide adequate assurance that the UHS will perform its design safety function. Corrective actions to restore full compliance with design basis requirements are in development.
"This event is being reported in accordance with 10 CFR 50.72 (b)(3)(ii) as an unanalyzed condition that degraded the safety function of the UHS."
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