Heat transfer performance of inert matrix dispersion pellet based on finite element analysis

Zhiwei LU; Yongdong ZHANG; Lei LI; Tong LIU; Jiaxiang XUE

doi:10.11889/j.0253-3219.2018.hjs.41.090604

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Heat transfer performance of inert matrix dispersion pellet based on finite element analysis

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

- Heat transfer performance of inert matrix dispersion pellet based on finite element analysis
- NUCLEAR TECHNIQUES Vol. 41, Issue 9, Article number: 090604(2018)
- 作者机构：
  
  中广核研究院有限公司事故容错燃料研发项目部深圳 518026
- 作者简介：
- 基金信息：
  
  National Major Special Projects
- DOI：10.11889/j.0253-3219.2018.hjs.41.090604
  CLC： TL33
- Received：26 October 2017，
  
  Revised：16 May 2018，
  
  Published：2018-09
- 稿件说明：
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Zhiwei LU, Yongdong ZHANG, Lei LI, et al. Heat transfer performance of inert matrix dispersion pellet based on finite element analysis[J]. Nuclear techniques, 2018, 41(9): 090604
DOI：

Zhiwei LU, Yongdong ZHANG, Lei LI, et al. Heat transfer performance of inert matrix dispersion pellet based on finite element analysis[J]. Nuclear techniques, 2018, 41(9): 090604 DOI： 10.11889/j.0253-3219.2018.hjs.41.090604.

摘要

惰性基弥散燃料芯块（Inert Matrix Dispersion Pellet，IMDP）以高温气冷堆燃料技术为基础，采用惰性材料作为三重各向同性型（Tristructural Isotropic，TRISO）燃料颗粒的弥散基体，相比传统的UO

燃料，其最典型特征是具备高热导率。采用通用有限元软件ABAQUS，结合其二次开发功能，建立有限元计算模型，研究了温度、燃耗以及燃料颗粒与惰性基体间热阻对IMDP燃料有效热导率影响规律，并与UO

陶瓷燃料进行对比。结果表明：IMDP有效热导率随燃耗及温度的增加而减小，且在不同寿期及不同温度下，IMDP有效热导率均明显高于UO

热导率；反应堆正常运行工况下，相比UO

芯块，IMDP较高的热导率会使芯块中心温度显著降低；此外，燃料颗粒与惰性基体间热阻在0~4×10

-4

·℃·W

-1

范围内对IMDP的有效热导率影响程度最为敏感。

Abstract

Background

Inert matrix dispersion pellet (IMDP)

based on the fuel technology of high temperature gas cooled reactor

a type of accident tolerant fuel

takes inert material as matrix

has high thermal conductivity compared to UO

Purpose

In this study

effect of temperature

burnup

thermal barrier between tristructural isotropic (TRISO) and matrix on the effective thermal conductivity (ETC) of the IMDP is studied by finite element analysis (FEA) method.

Methods

A FEA model is developed by ABAQUS combined its secondary development function.

Results

The ETC of IMDP decreases as temperature and burnup increases. Under normal operation condition

the centerline temperature of IMDP is 400℃ or more lower than UO

. When the thermal barrier between TRISO and matrix increases from 0 to 4×10

-4

·℃·W

-1

the ETC of IMDP decreases approximately 16% and 19% respectively at beginning of life (BOL) and middle of life (MOL).

Conclusions

IMDP has superior heat transfer performance than UO

. Thermal barrier between TRISO and matrix has more significant impact on BOL IMDP than MOL IMDP. Thermal barrier between 0 to 4×10

-4

·℃·W

-1

has more significant impact on ETC of IMDP than other values.

关键词

Keywords

references

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