Strategy of safety evaluation of water cooled solid breeder test blanket module

Representative events selected by the result of Failure Mode Effect Analysis (FMEA) are summarized into three groups, i.e., release of Radioactive Isotopes (RI), pressurization and heatup. With respect to events about release of RI, the maximum released RI is evaluated for three RI inventories, i.e., RI in Vacuum Vessel (VV) (tritium and radioactive dust), RI in purge gas (tritium) and RI in coolant (tritium and ACP). With respect to the events about pressurization, the maximum pressures of the compartments nearby the pipes of cooling system are evaluated. With respect to the events about heatup, preliminary thermal analyses have been carried out on three hypothetical cases, i.e., the case of loss of cooling, the case of ingress of coolant into the module and loss of offsite power after ingress of coolant. (author)