18 novembre 2014
Les 4 vannes d’alimentation des 4 accumulateurs ont été découvertes déverrouillées et fermées. Après détection du défaut, les vannes ont été ouvertes et verrouillées.
Type PWR - Puissance : 3 565 MWTh - Première divergence : 10/1984
Available in english only.
Event Number : 50625
Facility : CALLAWAY - State : MO
Unit : [1] - RX Type : [1] W-4-LP
Event Date : 11/18/2014 - Event Time : 19:00
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 0 % - Current PWR : 0 %
Event Text
UNANALYZED CONDITION DUE TO ALL FOUR SAFETY INJECTION ACCUMULATORS INOPERABLE
"Following shift turnover from days to nights on 11/18/2014, it was discovered that all (4) of the Safety Injection (SI) Accumulator Outlet Isolation Valve breakers were unlocked and closed. At the time of discovery, 3 of the safety injection accumulator valves were open and 1 was closed for testing. At that time the plant was in MODE 3 at normal operating pressure and temperature. The plant had been performing RCS pressure isolation valve testing prior to shift turnover. The condition was discovered during testing of valves associated with the ’C’ safety injection accumulator.
"After discovery of the condition, Operations directed that the ’A’, ’B’, and ’D’ SI Accumulator Outlet Isolation Valve breakers be opened and locked. This action was completed by approximately 1930 [CST] on 11/18/2014.
"The NRC Resident Inspector was notified."
The plant entered T.S. 3.0.3 for approximately 30 minutes while restoring the ’A’, ’B’ and ’D’ accumulators to operable (breakers opened and locked with their associated outlet valves open).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20141120en.html#en50625
La boutique
Informez vous