7 mars 2013
Le circuit d’injection haute pression a été trouvé dans l’impossibilté d’assurer sa fonction suite à un problème de vanne mal positionnée. Lorsque la vanne a été actionnée, son disjoncteur de commande a sauté.
Première divergence : mai 1984 - Puissance : 1 260 MW - Type : BWR - Mark 2 -
Available in english only.
ÇEvent Number : 48811
Facility : SUSQUEHANNA - State : PA
Unit : [2] - RX Type : [1] GE-4
Event Date : 03/07/2013 - Event Time : 01:35
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR 99% Current PWR 99%
Event Text
HIGH PRESSURE COOLANT INJECTION DECLARED INOPERABLE
"At 0135 EST, Unit 2 High Pressure Coolant Injection (HPCI) system was declared inoperable, and LCO 3.5.1 entered, due to its turbine steam exhaust valve failing in the closed position during the quarterly valve exercising surveillance. The supply breaker tripped when the opening stroke was attempted. The valve was verified to have remained fully closed via the manual operator. HPCI will not automatically start with this valve closed.
"HPCI is a single train Emergency Core Cooling Safety [ECCS] system. This event results in the loss of an entire safety function which requires an 8 hour ENS notification in accordance with 10CFR50.72(b)(3)(v) and the guidance provided under NUREG-1022, rev. 2.
"There are no other ECCS systems presently out of service."
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130307en.html
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