Effect of V shape notch on stress analysis of nuclear graphite component for liquid molten salt reactor

Xiong YANG; Guangli ZENG; Chenguang GU; Yang ZHONG; Dong DING

doi:10.11889/j.0253-3219.2017.hjs.40.070601

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Effect of V shape notch on stress analysis of nuclear graphite component for liquid molten salt reactor

更新时间：2021-05-19

- Effect of V shape notch on stress analysis of nuclear graphite component for liquid molten salt reactor
  封面论文
- NUCLEAR TECHNIQUES Vol. 40, Issue 7, Article number: 070601(2017)
- 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：
- 基金信息：
  
  Ministry of Human Resources and Social Security
- DOI：10.11889/j.0253-3219.2017.hjs.40.070601
  CLC： TL99
- Received：27 February 2017，
  
  Revised：19 April 2017，
  
  Published：10 July 2017
- 稿件说明：
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Xiong YANG, Guangli ZENG, Chenguang GU, et al. Effect of V shape notch on stress analysis of nuclear graphite component for liquid molten salt reactor[J]. Nuclear techniques, 2017, 40(7): 070601
DOI：

Xiong YANG, Guangli ZENG, Chenguang GU, et al. Effect of V shape notch on stress analysis of nuclear graphite component for liquid molten salt reactor[J]. Nuclear techniques, 2017, 40(7): 070601 DOI： 10.11889/j.0253-3219.2017.hjs.40.070601.

摘要

本文利用了一个根据球床模块堆（Pebble Bed Modular Reactor

PBMR）用核石墨材料辐照性能数据编写的用户自定义材料模型（User defined Material model

UMAT），按照美国橡树岭国家实验室（Oak Ridge National Laboratory

ORNL）的液态燃料熔盐试验堆（Molten Salt Reactor Experiment

MSRE）用核石墨构件尺寸，为钍基熔盐堆（Thorium-based Molten Salt Reactor

TMSR）设计了一款方型核石墨构件。利用新编UMAT对该核石墨构件进行了初步的应力分析。分析结果表明，在没有预制裂纹的情况下辐照梯度越大核石墨构件中心区域最大主应力值越大，构件的断裂位置可能出现在构件中心位置处；对于有V型凹口预制裂纹的情况，应力集中部位均出现在预制裂纹尖端附近，这将可能导致裂纹尖端附近出现裂纹扩展，从而引起构件断裂失效。

Abstract

Background

Nuclear graphite has served as neutron moderator

reflector and structural material in the liquid molten salt reactor (MSR) due to its excellent irradiation performance and mechanical properties at high temperature. During the life time of reactors

the properties of nuclear graphite will be changed due to the irradiation damage.

Purpose

The aim is to study the effect of V-shape notch on stress analysis of nuclear graphite component for liquid MSR.

Methods

A user-defined material model (UMAT) was used to model the irradiation behavior of nuclear graphite component. The finite element method was used to develop numerical models for the stress analysis of nuclear graphite component.

Results and Conclusion

The stress of nuclear graphite component increases as the irradiation gradient. What's more

the stress results of nuclear graphite component without crack and with V-shape crack are different. In the absence of a V-shape crack

the fracture position of the square-shaped graphite component may occur at the center of the structure. In the case of having a V-shape crack

the crack propagation may occur near the crack tip of the nuclear graphite component

which may cause fracture failure of the component.

关键词

Keywords

references

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