Reactor kinetics in a loss-of-forced-cooling (LOFC) test of HTGRS

Takamatsu, Kuniyoshi  ; Sawa, Kazuhiro

A core dynamics analysis of the loss-of-forced-cooling test of the HTTR is performed. The relation between the reactivities (namely, the Doppler, moderator temperature, and xenon reactivities) affecting re-critical time and reactor peak power level and total reactivity is addressed. Furthermore, the analytical results for the reactor transient for a long time such as hundreds of hours are presented in this report. They can teach emergency operating procedures in case of loss of coolant accident (LOCA) of HTGR when the control rods are not inserted into the core and the reactor power control system does not operated. The analytical results will be utilized for the design and construction of the Kazakhstan High Temperature Reactor (KHTR) and the realization of commercial Very High Temperature Reactor (VHTR) systems.