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

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

doi:10.11889/j.0253-3219.2018.hjs.41.040604

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

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor
- NUCLEAR TECHNIQUES Vol. 41, Issue 4, Article number: 040604(2018)
- 作者机构：
  
  中国核动力研究设计院核反应堆系统设计技术重点实验室成都 610023
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.040604
  CLC： TL328
- Received：01 June 2017，
  
  Revised：26 September 2017，
  
  Published：10 April 2018
- 稿件说明：
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Bin LIU, Lan LI, Huanwen LYU, et al. Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor[J]. Nuclear techniques, 2018, 41(4): 040604
DOI：

Bin LIU, Lan LI, Huanwen LYU, et al. Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor[J]. Nuclear techniques, 2018, 41(4): 040604 DOI： 10.11889/j.0253-3219.2018.hjs.41.040604.

摘要

在核反应堆一回路系统中，裂变中子产生的反冲质子通过电离、多次散射以及韧致辐射后，与冷却剂中的

O、

O和

B反应生成具有β

放射性的

N、

F和

C等核素，采用符合测量方法可以探测这些核素从而推断一回路水的泄漏情况。采用GEANT4程序对秦山二期压水堆全堆芯进行建模及源抽样描述，编制C++工具自动生成GEANT4计算所需的中子源分布，实现了G4-NONU功能以及GEANT4程序中中子固定源的输运计算。充分考虑反冲质子电离、多次散射以及韧致辐射等因素，计算了压水堆一回路水中由质子反应产生的

N、

F以及

C等核素的产生率、浓度以及活度，拓展了反应堆源项计算工具。

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

O(p

α)

O(p

F and

B(p

C. Positrons emitted by the radioactive nuclides

F and

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

O(p

α)

O(p

F and

B(p

C. Eventually

concentrations and activities of

F and

C 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.

关键词

Keywords

references

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