19 avril 2012
Suite à un problème technique, la puissance de l’unité Limerick 1 a été réduite manuellement de 100% à 7 h 53 le 19 avril 2012 conformément à une procédure. Les pompes des deux voies de recirculation se sont arrêtées suite a une perte d’alimentation électrique. Le réacteur est en arrêt à chaud avec contrôle de la pression réalisé par le condenseur via les vannes de dérivation de vapeur et avec un niveau normal maintenu par l’eau d’alimentation.
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Manual reator scram following loss of recirculation pumps
Limerick Unit 1 was manually scrammed from 100% power at 0753 hours on 4/19/12 in accordance with plant procedure OT-112 ’Recirculation Pump Trip’ when both 1A and 1B Recirculation Pump Adjustable Speed Drives (ASDs) tripped due to an electrical fault affecting the 144D and 114A non-safety related 480V Load Centers. The shutdown was normal and the plant is stable in Hot Shutdown with normal pressure control via the Main Steam Bypass valves to the main condenser and normal level control using feedwater. The manual RPS actuation is reportable under 10 CFR 50.72(b)(2).
The Technical Support Center (TSC) Normal Air conditioning systems shut down due to loss of power from the 144D Load Center. The loss of power also affects the flow indication for the Emergency Ventilation system. This is considered a Loss of Emergency Assessment Capability, and reportable under 10 CFR 50.72(b)(3)(xiii). The Emergency TSC Ventilation system is available but flow cannot be verified. During a required activation the TSC, responders would report to the TSC. If conditions required use of the Emergency Ventilation system, the Station Emergency Director would assess habitability in accordance with Station procedures. TSC relocation of personnel would be directed as required until such time that the TSC ventilation system is returned to service.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120420en.html
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