4 octobre 2015
L’accident survenu sur le réacteur n° 2 a été classé inhabituel et l’URGENCE a été déclarée. La fuite est survenue sur une tête de soupape du système de refroidissement de mise à l’arrêt. L’isolement du système de refroidissement a permis d’interrompre la fuite et le refroidissement du cœur a été assuré par les deux générateurs de vapeur et le condenseur principal.
Type : PWR - Puissance : 2 700 MWth - Première divergence : 10/1975
Available in english only.
Event Number : 51448
Facility : MILLSTONE
State : CT
Unit : [2] - RX Type : ,[2] CE
Event Date : 10/04/2015 - Event Time : 09:32
Last Update Date : 10/04/2015 Emergency Class : UNUSUAL EVENT 10 CFR Section : 50.72(a) (1) (i) - EMERGENCY DECLARED
Initial PWR : 0 % Current PWR : 0 %
Event Text
UNUSUAL EVENT DECLARED DUE TO IDENTIFIED RCS LEAKAGE > 25 GPM
At 0932 EDT on 10/4/15, the licensee declared an Unusual Event for identified RCS [Reactor Coolant System] leakage exceeding 25 gallons per minute [GPM], per EAL BU2, due to a relief valve leaking on the Shutdown Cooling System common header. The RCS leakage was within the capacity of the Charging System. At 0954 EDT the RCS leakage was terminated by isolating the Shutdown Cooling System. The cause of the relief valve failure is unknown and under investigation.
The RCS cooldown was terminated and both RCS loops were restored to service for decay heat removal using both Steam Generators and the Main Condenser. Current RCS temperature is 248 degrees F with RCS pressure at 248 psig. All offsite power and EDGs [Emergency Diesel Generators] are available.
The licensee intends to repair the relief valve to resume the RCS cooldown using the shutdown cooling system..
The licensee informed State and local agencies and the NRC Resident Inspector.
Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.
* * * UPDATE AT 1115 EDT ON 10/04/15 FROM FRED PERKINS TO S. SANDIN * * *
The licensee terminated the Unusual Event at 1100 EDT, based on verification that the RCS leakage was stopped.
The licensee informed State and local agencies and the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20151005en.html#en51448
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