Nuclear Energy Agency Committee on the Safety of Nuclear Installations
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چکیده
The Loviisa NPP went through an extensive severe accident management (SAM) programme during 1990's and early 2000's. Programme included a wide range of experimental and analytical studies and the selected SAM approach led to significant plant modifications. The SAM approach was developed and the SAM systems were designed to cope with the accidents starting from power operation states. More recently the severe accidents initiating during shutdown have been studied for Loviisa case and the applicability of the SAM strategy for shutdown states has been evaluated. The basic requirements for severe accident management during shutdown are the same as for power operating states. However, during shutdown states initial conditions, such as decay power and primary pressure, differs significantly from conditions during power operation. Also conditions in the containment are different when maintenance work is going on. Recovery actions in order to resume containment tightness and the operability of the SAM systems will be needed in accidents starting during shutdown. The overall efficiency of the SAM strategy has been evaluated with PRA level 2 for power operating states. For shutdown states the work involved with assessment of the SAM strategy applicability and development of level 2 PRA have been closely connected. Based on the work, new guidance and many procedures facilitating the SAM during shutdown will be implemented in the Loviisa NPP. The PRA level 2 shows the development towards efficient SAM also in shutdown states. However, work still has to be carried on.
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تاریخ انتشار 2009