Waiting Time Analysis for Asymptotic-Period Measurement of Reactivity

Evaluation of waiting time is a key problem for asymptotic-period measurement of reactivity.Based on the point reactor kinetics equation,the neutron multiplication function and error function for two period-measuring methods are deduced.The two methods include the double power method and the exponential-simulating method.The conclusion is drawn that waiting time is concerned with the external neutron source,delayed neutron parameters and reactivity.The exponential-simulating method can get the earlier asymptotic period than the double power method.