Analysis of Signal Current Composition of the Rhodium Self-powered Neutron Detector in HPR1000
The HPR1000 is a self-developed advanced Gen.Ⅲ PWR nuclear power plant,of which hundreds of rhodium self-powered neutron detectors(SPND)are equipped for reactor core monitoring.The rhodium detectors are not only irradiated by the in-core neutrons but also generate noise currents due to the high intensity of the γ rays.Meanwhile,as a representative delayed-response detector,the rhodium SPND also have a proportion of the prompt current.These characteristics lead to a significant complexity in its response composition,exactly determining the effective signal and thereby removing the noise is critical to the detector's performance and measurement accuracy.In this paper,the current composition components of rhodium detectors are analyzed thoroughly,and the model based on the Monte Carlo methods for quantitative calculations of each part of the current has been proposed.The calculation results show that the prompt current of the rhodium SPND in the HPR1000 accounts for about 8%of the total current,and the current induced by photons is approximately 3%.These results are in good agreement with the experimental values.The main advantage of this method is that it can simulate different neutron and photon environments in the reactor without relying on a large number of experiments.At the same time,this method is universal and could provide a valuable reference for the signal analysis of SPND in different reactors.
Reactor monitoringRhodium SPNDSignal current compositionHPR1000Monte Carlo method
NETL
NSTL
万方数据
