17 mars 2014
Toutes les vannes d’isolement de la vapeur principale ont été fermées manuellement. Les barres de contrôle se sont correctement insérées. L’isolement du système de refroidissement du cœur a été également enclenché manuellement afin de maintenir le niveau et la température de l’eau dans des plages correctes. Le cœur étant critique, les systèmes de protection du réacteur se sont enclenchés.
Type : BWR Mark 3 - Puissance 3 898 MWth : - Première divergence 08/1982
Available in english only.
Event Number : 49920 - Facility : GRAND GULF - 4 State : MS - Unit : [1] -RX Type : [1] GE-6 -
Event Date : 03/17/2014 - Event Time : 05:14
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 41 % Current PWR : 0 %
Event Text
MANUAL REACTOR SCRAM DUE TO STEAM LEAK IN LOW PRESSURE TURBINE LINE
"On 3/17/2014 at 0514 [CDT] the reactor was manually scrammed from approximately 41% core thermal power due to a steam leak in the turbine building. All control rods fully inserted and all systems actuated and operated as designed. All Main Steam Isolation Valves were manually shut. The Reactor Core Isolation Cooling System was manually initiated to assist in level control and pressure control. No safety relief valves actuated automatically. Manual cycling of safety relief valves and Reactor Core Isolation Cooling are being used to maintain reactor water level and pressure within normal bands. Group 2 and 3 RHR isolation signals were received ; however no valve movement occurred since the affected valves are normally closed.
"This event is reportable under 10CFR50.72(b)(2)(iv)(B) for the reactor trip and 50.72(b)(3)(iv)(A) for the manual start of the reactor core isolation cooling system."
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