13 mars 2015
La pièce défaillante sur le circuit d’injection a été remplacée sans que le réacteur n’ait été mis à l’arrêt. Le réacteur a donc fonctionné 12h35 sans cet important circuit de sûreté.
Type : Fukushima I (BWR Mark 1) - Puissance : 1 912 MWTh - Première divergence : 03/1974
Available in english only
Event Number : 50891
Facility : DUANE ARNOLD - State : IA
Unit : [1] - RX Type : [1] GE-4 -
Event Date : 03/13/2015 - Event Time : 12:30
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR : 100 %
Event Text
LOW PRESSURE COOLANT INJECTION DECLARED INOPERABLE
"This condition is reported in accordance with 10 CFR 50.72(b)(3)(v). On 3/12/15, during surveillance testing on LPCI [Low Pressure Coolant Injection] Loop Select Instrumentation, a degraded component was discovered. At 1230 CDT on 3/13/15, LPCI was declared INOPERABLE in accordance with Technical Specification requirements. All remaining ECCS systems remain available and operable.
"The NRC Resident Inspector has been informed."
* * * UPDATE AT 0210 EDT ON 03/14/15 FROM SCOTT AREBAUGH TO S. SANDIN * * *
"At 0105 CDT on 3/14/15, the subject component has been replaced and retested with satisfactory results. LPCI INOPERABLE condition was exited at 0105 CDT and the LPCI System is OPERABLE."
The licensee informed the NRC Resident Inspector. Notified R3DO (Orth).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150316en.html#en50891