8 février 2013
Pilgrim : arrêt d’urgence du réacteur n° 1 : L’évènement a été déclaré "inhabituel" suite à la perte des alimentations électriques extérieures supérieure à une durée de 15 mn. Le cœur étant critique, les systèmes de protection du réacteur se seraient enclenchés... sans plus de précision. L’alimentation électrique par les lignes extérieures a été rendue indisponible à plusieurs reprises.
La situation d’urgence a été déclarée.
Première divergence : juin 1972 - Puissance 685 MW - Type : Mark I -
Available in english only.
Le transformateur de démarrage a été inutilisable.
Il y a eu injection de sécurité à haute pression de liquide de refroidissement dans le circuit primaire et les barres de contrôle se sont insérées correctement.
L’incident a été déclaré clos seulement 36 h 55 après son départ, suite à l’arrêt à froid du réacteur et au retour du refroidissement de la piscine de stockage de combustible.
Facility : PILGRIM - State : MA - Unit : [1] - RX Type : GE-3 - Event Date : 02/08/2013 - Event Time : 22:00
Emergency Class : UNUSUAL EVENT
EMERGENCY DECLARED
RPS ACTUATION - CRITICAL
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 1 A/R Y 80 Power Operation 0 Hot Shutdown
Event Text
UNUSUAL EVENT DECLARED DUE TO LOSS OF OFFSITE POWER
"Pilgrim Station scrammed on a loss of offsite power. All systems performed as designed. Groups I, II, VI went to completion. Reactor Core Isolation Cooling (RCIC) is injecting to the vessel controlling level. High Pressure Coolant Injection is in pressure control and slowly cooling down. Offsite power was lost multiple times. The Startup Transformer has been declared inoperable. The Unusual Event was declared under EAL SU 1.1 based on loss of offsite power greater than 15 minutes [at 2200 EST]."
The licensee originally experienced an automatic reactor scram at 2117 EST due to a load reject with a turbine trip/reactor scram due to loss of power. Offsite power availability has been fluctuating in and out to the site. The licensee states that all systems are functioning as required. All rods fully inserted and the reactor is stable in Mode 3. Both Emergency Diesel Generators are providing power to the safety related buses. The loss of offsite power is believed to be weather related.
The licensee has notified the State and local authorities and the NRC Resident Inspector.
* * * UPDATE FROM PAUL GALLANT TO VINCE KLCO AT 2/10/13 AT 1108 EST* * *
Pilgrim terminated the Unusual Event and has transitioned to recovery effective at 10:55 AM on 02/10/2013. Offsite power has been restored to safety-related and non-safety-related electrical buses through the station Startup Transformer via a single 345 KV line. The other two offsite power sources remain out of service. The emergency diesel generators have been secured and are in standby. Residual heat removal is in shutdown cooling mode maintaining the reactor in cold shutdown. Fuel Pool Cooling is in service with fuel pool coolant temperatures trending down.
The licensee notified State, local authorities and the NRC Resident Inspector. Notified R1 RA (Dean), R1DO (Powell), NRR DIR(Leeds) NRR EO (Evans) and NSIR IRD (Marshall).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130211en.html
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