16 juin 2013
Mise à l’arrêt du réacteur suite à la découverte d’une fuite - qualifiée de légère par la NRC - de liquide de refroidissement. La fuite a été détectée sur une vanne d’évent située sur un circuit de recirculation.
1ère divergence : juin 1986 - Type : BWR Mark - 1
Available in english only.
Facility : PERRY - State : OH - Unit : [1] - RX Type : [1] GE-6
Event Date : 06/16/2013 - Event Time : 2 h 42
10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 8 % Current PWR : 8%
Event Text
TECHNICAL SPECIFICATION SHUTDOWN DUE TO SMALL REACTOR COOLANT LEAK ON A RECIRCULATION FLOW CONTROL VALVE VENT LINE
"This event is being reported in accordance with 10 CFR 50.72(b)(2)(i) and 50.72(b)(3)(ii)(A).
"On June 16, 2013 at 0200 EDT, the Perry Nuclear Power Plant commenced a controlled plant shutdown. The shutdown was due to a small leak through the base of a vent line on the ’B’ Reactor Recirculation Flow Control Valve.
"On June 15, 2013 at 2250 EDT, the leak was identified and was subsequently determined to require a plant shutdown in accordance with Technical Specification 3.4.5, Action (C) which requires the plant to be in Mode 3 within 12 hours.
"The NRC Resident Inspector has been notified." The licensee will also be notifying state and local authorities.
The licensee had come down in power to make a drywell entry and investigate drywell leakage indications. Steam was observed to be coming from a vent line that comes off the top of the recirc flow control valve. The licensee was unable to characterize the leak rate other than a small leak. The licensee stated that the steam appeared be coming from a weld location where the vent line comes out of the flow control valve which would classify it as pressure boundary leakage.
Event number : 49 121
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130617en.html#en49121
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