球形燃料元件中包覆颗粒的分布效应研究

冀锐敏; 严睿; 李晓晓; 戴叶; 刘桂民; 邹杨

doi:10.11889/j.0253-3219.2017.hjs.40.100604

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球形燃料元件中包覆颗粒的分布效应研究

核能科学与工程 | 更新时间：2021-05-19

- 球形燃料元件中包覆颗粒的分布效应研究
- Effect of TRISO-particles distributions in pebble fuel
- 核技术 2017年40卷第10期文章编号：100604
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "冀锐敏, 女, 1984年出生, 2008年于中国科学院上海应用物理研究所获硕士学位, 主要从事反应堆物理研究", "JI Ruimin, female, born in 1984, graduated from Shanghai Institute of Applied Physics, Chinese Academy of Sciences with a master's degree in 2008, focusing on the study of reactor physics" ]
  严睿, E-mail:yanrui@sinap.ac.cn YAN Rui, E-mail:yanrui@sinap.ac.cn
  刘桂民, E-mail:liuguimin@sinap.ac.cn LIU Guimin. E-mail:liuguimin@sinap.ac.cn
- 基金信息：
  
  中国科学院战略性先导科技专项(XDA02010000)
- DOI：10.11889/j.0253-3219.2017.hjs.40.100604
  中图分类号： TL99
- 收稿日期：2017-03-24，
  
  修回日期：2017-04-20，
  
  纸质出版日期：2017-10
- 稿件说明：
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冀锐敏, 严睿, 李晓晓, 等. 球形燃料元件中包覆颗粒的分布效应研究[J]. 核技术, 2017,40(10):100604

Ruimin JI, Rui YAN, Xiaoxiao LI, et al. Effect of TRISO-particles distributions in pebble fuel[J]. Nuclear techniques, 2017, 40(10): 100604
冀锐敏, 严睿, 李晓晓, 等. 球形燃料元件中包覆颗粒的分布效应研究[J]. 核技术, 2017,40(10):100604 DOI： 10.11889/j.0253-3219.2017.hjs.40.100604.

Ruimin JI, Rui YAN, Xiaoxiao LI, et al. Effect of TRISO-particles distributions in pebble fuel[J]. Nuclear techniques, 2017, 40(10): 100604 DOI： 10.11889/j.0253-3219.2017.hjs.40.100604.

摘要

在球形燃料元件中，包覆颗粒的填充因子低于10%，分布具有很大的随机性。本文利用MATLAB程序实现了4种填充的建模方式，即体积等效规则填充、扰动的规则填充、随机的规则填充和完全随机填充模拟燃料球中包覆颗粒的分布。基于固态燃料钍基熔盐堆（Thorium-based Molten Salt Reactor with Solid Fuel，TMSR-SF1）设计中选用的包覆颗粒燃料参数，使用蒙特卡罗程序MCNP6 1.0和ENDF/B Ⅶ.0数据库进行了全反射边界条件下的单燃料球临界计算，精确量化了不同的建模方式引起的中子物理特性参数的差异。计算表明，这4种建模方式形成了不同的包覆颗粒聚集程度。包覆颗粒的聚集会导致丹可夫效应的增强，从而增大了中子被燃料吸收的概率，无限增殖因数随之增大，燃料温度系数随之减小。

Abstract

Background

Packing fraction of tristructural-isotropic (TRISO) particles in pebble fuel is lower than 10% in general

which leads to great randomness in distribution

resulting in various challenges in neutronics modeling

such as double heterogeneity effect

preserving exact number of particles

and their random distributions in pebble.

Purpose

This study aims to verify the calculations

the infinite pebble fuel with refectory boundary conditions based on the thorium-based molten salt reactor with solid fuel (TMSR-SF1) pebble design using Monte-Carlo code MCNP6 ver1.0 and ENDF/B Ⅶ.0.

Methods

Four types of models of TRISO particles have been performed based on MATLAB

the equivalently filled regular model

the disturbed regular model

the randomly filled regular model

and the fully random model.

Results

The neutronic effect of various modeling approaches was quantitatively evaluated.

Conclusion

The results show that the four kinds of modeling methods form different randomness. The clustering of the coated particles enhances the Dancof effect which raises the neutron absorption probability in the fuel. As a result

the infinite multiplication factor is increased while the fuel temperature coefficient is decreased.

关键词

Keywords

references

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