Sensitivity Analysis for Transient of Partial Loss of Reactor Coolant Flow of Super LWR

Taking the Super LWR concept proposed by Japanese as the background,relevant mathematical and physical calculation models are built,and the effect of coast-down time of primary pump,scram delay and ratio of density coefficient on the maximum cladding surface temperature（MCST） is evaluated.The results show that: after the transient of partial loss of reactor coolant flow,due to the pump seize and reactor scram,the maximum cladding temperature increases quickly at first and then declines rapidly;extending the coast-down time of primary pump can delay the reduction in the flow of coolant,thereby delaying the increasing of maximum cladding temperature;scram delay is the shorter,thereby better slow down the maximum cladding temperature;Ratio of density coefficient affects the maximum cladding temperature changes a little.Visibly,the coast-down time of primary pump or the scram delay can be a significant impact on the safety performance of the core.