Calculation and verification of secondary neutron source intensity of nuclear reactor

This paper studies and proposes a mechanism-based calculation method of secondary neutron source (SNS) intensity of nuclear reactor, and calculated the SNS intensity of the reactor of a certain nuclear power plant at the refueling outage of the second cycle. In order to verify the calculated SNS intensity, when the step 2 of the refueling process is finished, the counting rate of the ex-core source range detector is calculated and compared with the measured data. The comparison result shows good agreement and indicates the correctness of the SNS intensity calculation result and the reasonableness of the proposed calculation method.