Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel

Jianping JING; Yaning LIU; Bin JIA; Xinli GAO; Wei SUN; Jiaxu ZUO; Chunming ZHANG

doi:10.11889/j.0253-3219.2016.hjs.39.100604

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Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel

Nuclear Energy Science and Engineering | 更新时间：2021-05-24

- Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel
- NUCLEAR TECHNIQUES Vol. 39, Issue 10, Article number: 100604(2016)
- 作者机构：
  
  1.环境保护部核与辐射安全中心北京 100082
  2.中国科学院过程工程研究所北京 100190
- 作者简介：
- 基金信息：
  
  Strategic Priority Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2016.hjs.39.100604
  CLC： TL99
- Received：02 June 2016，
  
  Revised：17 August 2016，
  
  Published：2016-10
- 稿件说明：
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Jianping JING, Yaning LIU, Bin JIA, et al. Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel[J]. Nuclear techniques, 2016, 39(10): 100604
DOI：

Jianping JING, Yaning LIU, Bin JIA, et al. Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel[J]. Nuclear techniques, 2016, 39(10): 100604 DOI： 10.11889/j.0253-3219.2016.hjs.39.100604.

摘要

钍基熔盐堆核能系统项目是中科院先导科技专项之一，其战略性目标是研发第四代熔盐冷却裂变反应堆核能系统。基于10 MWt固态燃料熔盐堆的系统设计，开发了适用于球床式反应堆系统的安全分析软件，并以高温气冷堆为对象对程序计算结果的准确性进行了验证。基于该软件程序，对固态燃料球床堆（Thorium Molten Salt Reactor-Solid Fuel，TMSR-SF）控制棒失控抽出事故进行了分析计算，研究了不同停堆限值及各停堆信号对事故的影响。计算结果表明，超功率停堆限值越高，出口温度限值越大，信号延迟时间越长，反应堆停堆越晚，堆芯功率和燃料最高温度越高。在TMSR-SF控制棒失控抽出事故下，燃料最高温度不超过860℃，远低于1 600℃的熔化温度限值。

Abstract

Background

Thorium-based molten salt reactor nuclear power system project is one of the "Strategic Priority Program" of Chinese Academy of Sciences

and its strategic goal is to develop the fourth generation moltensalt cooled fission reactor nuclear power system. Based on the system design of 10-MWt molten salt reactor-solid fuel

a safety analysis software is developed for the pebble bed reactor system and verified the correctness and accuracy for the high-temperature gas-cooled reactor of results calculated via this software program.

Purpose

This study aims at accident analyses of uncontrolled rod cluster control assembly bank withdrawal for thorium molten salt reactor-solid fuel (TMSR-SF) by using the developed program.

Methods

The TMSR-SF reactor core model is built according to the designed parameters. Analyses of the impacts of different shutdown limits and shutdown signals on the withdrawal accident of the TMSR-SF uncontrolled rod cluster control assembly bank is carried out through the safety analysis models such as neutron kinetics model

fluid flow and heat transfer model

control model

etc.

in the developed program.

Results

In the withdrawal accident of the uncontrolled rod cluster control assembly bank of the TMSR-SF

the maximum temperature of the reactor fuel temperature is no more than 860℃.

Conclusions

Computional results show that the higher the limit value of over power shutdown is

the greater the outlet temperature is; the longer the signal delay time is

the later the reactor shutdown happens

and the higher the core power and fuel temperature is. Compared with the limit value of shutdown

the outlet temperature reaches the limit later in time sequence

the maxumum fuel temperature is much lower than the fuel pebble melting temperature limit of 1 600℃ under no circumstances.

关键词

Keywords

references

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