Influence of particle size and its standard deviation on failure probability of coated fuel particles

Yongdong ZHANG; Jun LIN; Haiqing ZHANG; Zhiyong ZHU

doi:10.11889/j.0253-3219.2016.hjs.39.120603

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Influence of particle size and its standard deviation on failure probability of coated fuel particles

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-24

- Influence of particle size and its standard deviation on failure probability of coated fuel particles
- NUCLEAR TECHNIQUES Vol. 39, Issue 12, Article number: 120603(2016)
- 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：
  
  Strategic Priority Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2016.hjs.39.120603
  CLC： TL352
- Received：01 September 2016，
  
  Revised：07 November 2016，
  
  Published：2016-12
- 稿件说明：
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Yongdong ZHANG, Jun LIN, Haiqing ZHANG, et al. Influence of particle size and its standard deviation on failure probability of coated fuel particles[J]. Nuclear techniques, 2016, 39(12): 120603
DOI：

Yongdong ZHANG, Jun LIN, Haiqing ZHANG, et al. Influence of particle size and its standard deviation on failure probability of coated fuel particles[J]. Nuclear techniques, 2016, 39(12): 120603 DOI： 10.11889/j.0253-3219.2016.hjs.39.120603.

摘要

三结构同向性型（Tristructural isotropic，TRISO）包覆燃料颗粒是目前高温气冷堆和固态燃料熔盐堆采用的燃料元件。TRISO包覆燃料颗粒破损会导致裂变产物不可接受的释放，由此影响反应堆的安全运行。基于TRISO包覆燃料颗粒压力壳式破损模型，分析了TRISO包覆燃料颗粒核芯和各包覆层的尺寸对失效概率的影响，研究了TRISO包覆燃料颗粒核芯半径、疏松热解碳（Buffer）层厚度和碳化硅（SiC）层厚度的合理设计范围。同时，利用随机抽样统计的方法分析了TRISO包覆燃料颗粒核芯半径分布和各包覆层厚度分布对颗粒失效概率的影响。研究发现，降低Buffer层厚度分布的标准差至16 μm可以使TRISO包覆燃料颗粒的失效概率降低一个数量级。

Abstract

Background:

Tristructural isotropic (TRISO) coated fuel particles are used as fuel carrier for high-temperature gas-cooled reactors and solid-fuel-molten-salt reactors. The failure of the TRISO coated fuel particles can result in unacceptable release of fission products.

Purpose:

The distribution of the kernel radius and coating layer thickness could impact the failure probability of the TRISO particles.

Methods:

The influence of the distribution of the kernel radius and coating layer thickness on the failure probability was also analyzed by random sampling.

Results:

The design of the kernel radius

Buffer PyC layer thickness as well as the SiC thickness affect the TRISO coated fuel particles failure probability much heavier.

Conclusion:

It is found that the failure probability of the TRISO coated fuel particles can be reduced by one order of magnitude when the standard deviation of the distribution of the Buffer PyC layer thickness is reduced to 16 μm.

关键词

Keywords

references

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Yongdong ZHANG , Jun LIN , Tianbao ZHU , . Effects of temperature distribution on failure probability of coated particles in spherical fuel elements . Nuclear Techniques , 2016 . 39 ( 1 ): 010603 DOI: 10.11889/j.0253-3219.2016.hjs.39.010603 http://doi.org/10.11889/j.0253-3219.2016.hjs.39.010603 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract534.shtml .

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