29 août 2012
Panne sur l’ordinateur principal de l’unité 2 de Clavert Cliffs. Cet ordinateur permet la surveillance des retours de données sytèmes d’urgence ainsi que l’affichage des paramètres de sûreté. La perte de cet ordinateur, qui exige des moyens de contournement permettant d’estimer l’état du réacteur, seraient consignées dans les procédures. Malgré cela, la puissance du réacteur a été maintenue à 100 %.
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Facility : CALVERT CLIFFS - Region : 1 State : MD - Unit : [2] Event Date : 08/29/2012 - Event Time : 19:30 Emergency Class : NON EMERGENCY
Event Text PRIMARY PLANT COMPUTER OUT OF SERVICE
"Calvert Cliffs Unit 2 Primary Plant Computer (PPC) is out of service. The PPC provides monitoring capability for the Emergency Response Data System and Safety Parameter Display System. The loss of the PPC requires alternate monitoring methods, as described in plant procedures, to be used. Therefore, appropriate assessment of plant conditions, notifications and communications can still be made, if required, during the time that the PPC is unavailable.
"This report is being made in accordance with 10 CFR 50.72(b)(3)(xiii) which is any event that results in major loss of emergency assessment capability, offsite response capability, or offsite communications capability. As previously stated, alternate means remain available to assess plant conditions, make notifications and accomplish required communications, as necessary."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120831en.html
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