24 juillet 2014
Les spécifications techniques prévoient la mise à l’arrêt du réacteur.
Type : PWR - Puissance : 2 737 MWTh - Première divergence n° 1 : 10/1974
Available in english only.
Event Number : 50307
Facility : CALVERT CLIFFS - State : MD - Unit : [1] - RX Type : [1] CE -
Event Date : 07/24/2014 - Event Time : 23:15
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 100 % Current PWR : 100 %
Event Text
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO REACTOR COOLANT SYSTEM PRESSURE BOUNDARY LEAKAGE
"At 2315 EDT on July 24th, 2014, CCNPP [Calvert Cliffs Nuclear Power Plant] U1 identified RCS [Reactor Coolant System] pressure boundary leakage from the instrument line to 1-PDT-123A, 11A reactor coolant pump differential pressure transmitter. Technical Specification 3.4.13, Action B was entered and requires that the unit be placed in Mode 3 within 6 hours and Mode 5 within 36 hours. [CCNPP has] initiated plant shutdown in accordance with this Technical Specification. Therefore, this is reportable under 10 CFR 50.72(b)(2)(i) Plant Shutdown Required by Technical Specifications. This is also reportable under 50.72(B)(3)(ii)(A) as a material defect in the primary coolant system that cannot be found acceptable under ASME Section XI, IWB-3600 or ASME Section XI, Table IWB-3410-1."
The licensee notified the NRC Resident Inspector.
* * * UPDATE FROM JAY GAINES TO VINCE KLCO AT 0320 EDT ON 7/25/14 * * *
The licensee reduced reactor power to 10 percent and entered containment. The pressure boundary leak was isolated and the licensee exited the Technical Specification 3.4.13, Action B. The Technical Specification required shutdown was terminated. The licensee is making preparation to increase power to full load.
The licensee will notify the NRC Resident Inspector.
Notified the R1DO (Gray).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140728en.html#en50307
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