Transient analysis on Passive Compact Molten Salt Reactor (PCMSR)

The use of liquid fuels in the form of molten salts LiF-BeF₂-ThF₄-UF₄ in Passive Compact Molten Salt Reactor (PCMSR) makes power control at PCMSR can be done by controlling the flow rate of fuel and coolant. In addition, from safety systems aspect, the use of liquid fuels makes PCMSR has good inherent safety characteristics. In this study transient analysis has been carried out on three conditions of PCMSR, namely when the fuel flow rate is changing, when the coolant flow rate is changing and when there is loss of heat sink condition. This research is conducted with reactor modeling at steady state condition using Standard Reactor Analysis Code (SRAC). Next from SRAC's output, neutron flux, neutron group constant, delayed neutron constant, delayed neutron fraction are obtained for transient calculation.This study showed that the decreasing of fuel flow rate by 50% from the previous rate of fuel, causing power on PCMSR decreased to 78% from the previous power. And the decreasing of coolant flow rate by 50% from the previous rate of fuel, causing power on PCMSR decreased to 63% from the previous power. Meanwhile, in the event of loss of heat sink showed a decrease of PCMSR's power. (author)