31 mars 2014
La fuite de plusieurs gouttes par minute s’est produite sur la vanne associée à un circuit de commande d’une grappe de barres de contrôle. Comme les tentatives d’arrêter la fuite se sont avérées vaines, ce circuit étant en liaison directe avec le fluide primaire, le réacteur a été mis à l’arrêt pour réparations.
Type : Fukushima 1 (BWR Mark 1) - Puissance : 2 957 MWTh - Première divergence : 04/1972
Available in english only.
Event Number : 49977
Facility : QUAD CITIES - State : IL - Unit : [2] RX Type : [2] GE-3
Event Date : 03/31/2014 - Event Time : 13:02
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 87 % Current PWR : 54 %
Event Text
UNIT 2 REACTOR PRESSURE BOUNDARY LEAKAGE AND UNIT SHUTDOWN
"On March 31, 2014, at 1302 [CDT], with Unit 2 operating in Mode 1 (coastdown), leakage was identified from the body of a one inch isolation valve associated with a Control Rod Drive Hydraulic Control Unit (CRD HCU 18-27 insert valve 101). The leakage is several drops per minute ; attempts to isolate the leak have been unsuccessful. The associated piping communicates with the reactor coolant system (through the CRD mechanism).
"Technical Specification 3.4.4 (RCS Operational Leakage), Condition C, was entered at 1302 hours. Condition C requires the unit to be placed in Mode 3 (Hot Shutdown) in 12 hours. At 1616 hours, a Technical Specification required shutdown was initiated on Unit 2.
"The cause and resolution of the leakage are being pursued.
"This condition is being reported under 50.72(b)(3)(ii)(A) given the defect is associated with the primary coolant system pressure boundary. This notification is also being made in accordance with 10 CPR 50.72(b)(2)(i) given the initiation of a plant shutdown required by the plant Technical Specifications."
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140401en.html#en49977
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