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Method and Validation for Measurement of Effective Thermal Diffusivity and Conductivity of Pebble Bed in High Temperature Gas-cooled Reactors

[+] Author and Article Information
Yongyong Wu

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, C200, Building Nengke, Tsinghua University, Beijing, 100084, China
wu-yy15@mails.tsinghua.edu.cn

Cheng Ren

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, C200, Building Nengke, Tsinghua University, Beijing, 100084, China
rcheng@mail.tsinghua.edu.cn

Rui Li

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, C200, Building Nengke, Tsinghua University, Beijing, 100084, China
lirui871014@126.com

Xingtuan Yang

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, C200, Building Nengke, Tsinghua University, Beijing, 100084, China
xingtuanyang11@163.com

Jiyuan Tu

School of Engineering, RMIT University, Melbourne, VIC 3083, Australia; RMIT University, Melbourne, VIC 3083, Australia
jiyuantu10@163.com

Shengyao Jiang

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, C200, Building Nengke, Tsinghua University, Beijing, 100084, China
jiangshy2012@163.com

1Corresponding author.

ASME doi:10.1115/1.4039035 History: Received September 06, 2017; Revised January 08, 2018

Abstract

The effective thermal diffusivity and conductivity of pebble bed in the High Temperature Gas-cooled Reactor (HTGR) are two vital parameters to determine the operating temperature and power in varisized reactors with the restriction of inherent safety. A high-temperature heat transfer test facility and its inverse method for processing experimental data are presented in this work. The effective thermal diffusivity as well as conductivity of pebble bed will be measured at temperature up to 1600 degree centigrade in the under-construction facility with the full-scale in radius. The inverse method gives a global optimal relationship between thermal diffusivity and temperature through those thermocouple values in the pebble bed facility, and the conductivity is obtained by conversion from diffusivity. Furthermore, the robustness and uncertainty analyses are also set forth here to illustrate the validity of the algorithm and the corresponding experiment. A brief experimental result of preliminary low-temperature test is also presented in this work.

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