Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (4): 40604-040604.doi: 10.11889/j.0253-3219.2018.hjs.41.040604

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor

LIU Bin, LI Lan, LYU Huanwen, XIAO Feng, JING Futing, YING Dongchuan, WEI Shuping, TANG Songqian, YANG Junyun   

  1. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610023, China
  • Received:2017-06-01 Revised:2017-09-26 Online:2018-04-10 Published:2018-04-11

Abstract: [Background] In reactor core, recoil protons produced by fission neutrons may interact with coolant of the primary circuit and produce radioactive nuclides through reactions 16O(p,α)13N, 18O(p,n)18F and 11B(p,n)11C. Positrons emitted by the radioactive nuclides, 13N, 18F and 11C, etc., can be detected by coincidence measurement, hence the leakage of the reactor coolant inferred. However, calculation of the source terms of the nuclear reactor core are mainly based on solving the point burn-up equation or simulation of the reactivity based on Monte Carlo method, lacking the capability to simulate (p,α) and (p,n) reactions for protons at 0~20 MeV. [Purpose] This study aims to simulate the production of source terms generated by protons for the reactors of Qinshan's second nuclear plant. [Methods] Full reactor core of the reactor was modeled in GEANT4. Source sampling description based on general particle source (GPS) was achieved in consideration of radial and axial power distributions of the reactor core. G4-NONU was developed using C++ for neutron transportation to realize the function of NONU card in MCNP (Monte Carlo N Particle Transport Code) by modifying the fission model in GEANT4. Energy spectrum of recoil protons in water of the primary circuit was calculated, so were the reactivities of 16O(p,α)13N, 18O(p,n) 18F and 11B(p,n)11C. Eventually, concentrations and activities of 13N, 18F and 11C of the primary circuit were computed. [Results and Conclusion] Methods for description of source terms for pressurized water reactor in GEANT4 were established and nuclear reactor problems involving charged particles can be simulated by self developed G4-NONU, which is an enrichment of the simulations tool for nuclear reactor.

Key words: GEANT4 simulation, Pressurized water reactor, Charged particles, Source terms of the primary circuit

CLC Number: 

  • TL328