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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

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

Cheng Ren

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

Rui Li, Xingtuan Yang, Shengyao Jiang

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

Jiyuan Tu

School of Engineering,
RMIT University,
Melbourne VIC 3083, Australia

1Corresponding author.

Manuscript received September 6, 2017; final manuscript received January 8, 2018; published online May 16, 2018. Assoc. Editor: Giacomo Grasso.

ASME J of Nuclear Rad Sci 4(3), 031006 (May 16, 2018) (10 pages) Paper No: NERS-17-1109; doi: 10.1115/1.4039035 History: Received September 06, 2017; Revised January 08, 2018

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 °C 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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Figures

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Fig. 1

Appearance of test facility

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Fig. 2

The vertical cut of test facility

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Fig. 3

Distribution of measuring points and the schematic diagram of control volume along radial direction

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Fig. 4

Six radial temperatures of T1–T6 derived from simulation experiment in middle level

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Fig. 5

Comparison of normalized sensitivity coefficient at T2 and measured temperatures (the six lines indicate the six-point temperature distributions in Fig. 4, and they are used for comparison here)

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Fig. 6

Sensitivity coefficients of T2–T5 within whole heating process

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Fig. 7

Three dimensionless ratios of pj uncertainty to pj

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Fig. 8

Calculated α value by inverse method with its error bar from stochastic errors

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Fig. 9

Six averaged radial temperatures of the preliminary test in middle level, including heating and cooling processes

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Fig. 10

Effective thermal diffusivity of pebble bed derived from the preliminary test

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Fig. 11

Comparison of effective thermal conductivity with the result of HTTU in South Africa (2014) [13] within low-temperature region

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