Location calculation of shim rods in thorium molten salt reactor with solid fuel

Guifeng ZHU; Rui YAN; Shihe YU; Honghua PENG; Xuzhong KANG; Pu YANG; Bo ZHOU; Yang ZOU

doi:10.11889/j.0253-3219.2018.hjs.41.110601

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Location calculation of shim rods in thorium molten salt reactor with solid fuel

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

- Location calculation of shim rods in thorium molten salt reactor with solid fuel
- NUCLEAR TECHNIQUES Vol. 41, Issue 11, Article number: 110601(2018)
- 作者机构：
  
  中国科学院上海应用物理研究所上海 201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.110601
  CLC： TL3
- Received：22 June 2018，
  
  Revised：18 September 2018，
  
  Published：10 November 2018
- 稿件说明：
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Guifeng ZHU, Rui YAN, Shihe YU, et al. Location calculation of shim rods in thorium molten salt reactor with solid fuel[J]. Nuclear techniques, 2018, 41(11): 110601
DOI：

Guifeng ZHU, Rui YAN, Shihe YU, et al. Location calculation of shim rods in thorium molten salt reactor with solid fuel[J]. Nuclear techniques, 2018, 41(11): 110601 DOI： 10.11889/j.0253-3219.2018.hjs.41.110601.

摘要

燃耗补偿棒棒位是反应堆监测的一项重要参数，同时棒位移动会对堆芯物理参数分布造成影响。计算了固态燃料钍基熔盐实验堆（Thorium Molten Salt Reactor with Solid Fuel，TMSR-SF1）的补偿棒位变化，并分析其对功率、通量及燃耗分布的影响。在一般蒙特卡罗燃耗软件基础上耦合了调棒临界搜索功能，计算表明大部分临界搜索只需三次，验证了算法收敛的有效性。对TMSR-SF1未分组补偿棒方案进行了计算，结果表明：补偿棒位在氙平衡及寿期末时刻有较大提升幅度，其余时刻近似线性上升；补偿棒初期在总行程一半偏上位置，增加了堆芯轴向功率及中子通量分布的不均匀性，相对寿期末功率峰因子偏大17%，最大中子通量偏大12%。该变化未对总体设计参数造成显著影响，证明补偿棒未分组方案具有设计可行性。

Abstract

Background

The location of shim rods is one important monitoring parameter of nuclear reactor

and the shift of shim rods will affect the core physical parameters.

Purpose

This study aims to calculate the location of shim rods varied with burnup time in thorium molten salt reactor with solid fuel (TMSR-SF1)

and analyze its effect on the spatial distribution of power density

flux and burnup.

Methods

A reactivity search by adjusting shim rods is coupled to conventional Monte Carlo burnup code. It is validly shown that 3 times are mostly required to realize reactivity convergence. The location of shim rods with one group scheme in TMSR-SF1 is calculated.

Results

Results show that shim rods are sharply moved when near to the time of xenon equilibrium and end of life

while linear changed under middle burnup time. Shim rods at the beginning are located in the upper side of half rod route

which increases the axial unevenness of power density and flux. The power peak factor and maximum flux are 17% and 12% larger than those at the end of life.

Conclusions

This change of power peak factor and maximum flux are accepted and it is feasible to use one group scheme of shim rods in TMSR-SF1.

关键词

Keywords

references

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