16 juillet 2014
Cet ordinateur fournit de nombreux paramètres du réacteur dont certains servent à évaluer les situations d’urgence. Des actions immédiates ont été mises en œuvre pour restaurer un fonctionnement normal qui est survenu 2h et 7 min après le début du problème.
Type : Fukushima 1 (BWR Mark 1 ) - Puissance : 2 028 MWth - Première divergence : 06/1972
Available in english only.
Event Number : 50273
Facility : PILGRIM - State : MA - Unit : [1] - RX Type : [1] GE-3
Event Date : 07/11/2014 - Event Time : 08:23
Emergency Class : NON EMERGENCY 10 CFR Section :
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Initial PWR 100 % - Current PWR 100 %
Event Text
LOSS OF ASSESSMENT CAPABILITY - LOSS OF POWER TO THE PLANT PROCESS COMPUTER
"At 0823 EDT on Friday, July 11, 2014, the Pilgrim Nuclear Power Station (PNPS) determined that the plant process computer and, therefore, the in-plant Safety Parameter Display System (SPDS) was not functioning as designed due to a loss of power. The SPDS provides numerous plant parameters, some of which are credited for emergency assessment capability. The site has determined that this constitutes a major loss of assessment capability. Immediate actions were taken to restore the system to functional status and applicable plant procedures were entered to determine temporary mitigating actions. Power was subsequently restored at approximately 1030 EDT via an alternate supply, and SPDS has been restored to normal operation.
"This event had no impact on the health and/or safety of the public.
"This notification is conservatively being made in accordance with 10 CFR 50.72 (b)(3)(xiii).
"There is no impact to plant operations."
The licensee notified the NRC Resident Inspector and will notify the State.
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