The influence of reactor hall on the measurement of reactivity using prompt neutron method

In response to the phenomenon of deviation between reactivity measurement values and expected values observed in pulsed reactor experiments, the reactivity measurement process in fission pulse experiments was simulated. The phenomenon of low measurement values by the prompt neutron method has been reproduced. It was found that the return of reflected neutrons is delayed and dispersed, and some reflected neutrons did not return in time during the reactivity measurement process, resulting in low reactivity measurement values. Therefore, the measurement values obtained by the prompt neutron method need to be corrected in some cases.