17 février 2013
Découverte d’une fuite sur le circuit primaire du réacteur n° 2 de Calvert Cliffs. Un trou a été trouvé sur la vanne du préssuriseur. Le réacteur qui était à 400 °C et 950 PSI (65 bars) a été conduit en arrêt en 36 heures.
Première divergence : novembre 1976 - Puissance : 850 MW : Type : PWR -
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Facility : CALVERT CLIFFS - Region : 1 State : MD Unit : [2] - RX Type : [2] CE
Event Date : 02/17/2013 - Event Time : 13:45
Emergency Class : NON EMERGENCY 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 0% Current PWR ; 0%
Event Text
"CCNPP [Calvert Cliffs Nuclear Power Plant] U-2 discovered during the Mode 3 NOP/NOT containment walkdown that 2CV-100F Pressurizer Spray valve had a pin hole leak on the leak-off welded cap. This indicates that the bellows has a leak and in addition, the packing is leaking, pressurizing the leak-off line thus the leak-off line is the pressure boundary making this pressure boundary leakage. Technical Specification 3.4.13 [Action B] requires the unit be in mode 3 in 6 hrs. Unit was in mode 3 when discovered and unit will be placed in mode 5 within 36 hrs. Currently, the plant is at 400 degrees and 950 PSIA."
The licensee has notified the NRC Resident Inspector.
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