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Etats-Unis : Dresden : fuite sur une conduite du circuit de contrôle de liquide de refroidissement en état de standby du réacteur n°3




12 September 2017


La fuite qui a eu lieu sur un tuyau de décharge commun à deux circuits a éliminé des fonctions de sécurité nécessaires à l’arrêt du réacteur ainsi qu’à son maintien dans des conditions sûres.

Type : Fukushima 1 (BWR Mark 1) - Puissance : 2 597 MWth - Première divergence : 1 / 1971 -

Available in english only


Event Number: 52964

Facility: DRESDEN

State: IL Unit: [3] RX Type: [3] GE-3

Event Date: 09/12/2017 - Event Time: 11:31 [CDT]

Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION

Initial PWR : 100 % Current PWR : 100 %

Event Text STANDBY LIQUID CONTROL SYSTEM PIPING FAILURE

"On September 12, 2017 at 1131 CDT, both Unit 3 Standby Liquid Control system (SLC) subsystems were declared inoperable for a through wall leak on the common discharge piping. With both subsystems inoperable, the SLC system was unable to fulfill its safety function.

"This event is reportable under 10 CFR 50.72(b)(3)(v)(A) for an event or condition that could have prevented the fulfillment of a safety function of a system that is needed to shut down the reactor and maintain it in a safe shutdown condition and under 10 CFR 50.72(b)(3)(v)(D) for a system that was unavailable for accident mitigation.

"The NRC Resident Inspector has been notified."

With both trains of SLC inoperable, the licensee entered an 8-hr. action statement to restore at least one train to operability. If unable to do so, then the plant will enter a 12-hr. shutdown action statement.

https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170913en.html