8 décembre 2013
Alors qu’il était à pleine puissance, le réacteur a connu la perte d’un transformateur, qui a entrainé la perte d’une alimentation électrique. Les circuits d’air ayant été affectés, les opérateurs ont enclenché l’arrêt manuel du réacteur. Le cœur étant critique, les systèmes de protection du réacteur se seraient enclenchés.
Type : BWR - Puissance : 3 473 MWTh - Première divergence : 02 / 1987
Available in english only.
Event Number : 49617
Facility : CLINTON - 3 State : IL - Unit : [1] - RX Type : [1] GE-6
Event Date : 12/08/2013 - Event Time : 20:27
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 97% Current PWR : 0 %
Event Text
MANUAL SCRAM DUE TO LOSS OF DIVISION 1 480 VAC POWER CAUSING LOSS OF INSTRUMENT AIR TO CONTAINMENT AND SCRAM AIR HEADER
While operating at rated electrical power, the station experienced a transformer fault which resulted in a loss of Division 1 480 VAC power. This resulted in the operators inserting a Manual Scram due to loss of Instrument Air to Containment and the scram air header. On the scram, all control rods fully inserted and no safety relief valves lifted. Reactor vessel level is being maintained by normal feedwater and decay heat is being removed via steam to the main condenser through the steam bypass valves. The plant is currently in Mode 3 and proceeding to Mode 4 to comply with Technical Specification requirements. The plant is in a normal shutdown electrical lineup with the exception of the loss of Division 1 480 VAC power.
Reporting in accordance with 10CFR50.72(b)(3)(v)(C) due to loss of normal ventilation to secondary containment which resulted in a positive secondary containment pressure for approximately 15 minutes. Secondary Containment required pressure was restored at 2043 CST.
Reporting in accordance with 10CFR50.72(b)(3)(v)(D) due to loss of Division 1 480 VAC power resulting in loss of a single train of Low Pressure Core Spray.
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20131210en.html