20 février 2013
Lors de tests, deux vannes ont montré leur incapacité à assurer le maintien en eau des circuits qu’elles devaient protéger en cas de problème.
Première divergence : juin 1986 - Puissance : 882 MW - Type : Mark I
Available in english only.
Facility : HATCH - 2 State : GA Unit : [2] - RX Type : GE-4 Event Date : 02/20/2013 - Event Time : 05:28 Emergency Class : NON EMERGENCY 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial 0 % Current PWR 0 0%
Event Text
DEGRADED CONDITION - FEEDWATER CHECK VALVES FAIL LOCAL LEAK-RATE TESTING
"On February 20, 2013, at 0538 EST, local leak-rate testing (LLRT) of the ’A’ feedwater check valves 2B21-F010A and 2B21-F077A revealed that neither valve would pressurize. Based on this information this line would not remain water filled post-LOCA and would result in the ’as found’ minimum pathway leakage exceeding the limiting condition of operation (LCO) for Technical Specification 3.6.1.1. The cause for the LLRT failures will be determined and required corrective maintenance will be performed and valves successfully tested during the current refueling outage."
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130221en.html