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Research Papers

Fully Coupled Simulation of Oxygen and Heat Diffusion for (U,Pu)O2 Fuel in Both Fast-Breeder Reactor and Light-Water Reactor

[+] Author and Article Information
Wenzhong Zhou

Department of Mechanical and Biomedical Engineering,
City University of Hong Kong,
Hong Kong, China
e-mail: wenzzhou@cityu.edu.hk

Rong Liu

Department of Mechanical and Biomedical Engineering,
City University of Hong Kong,
Hong Kong, China

1Corresponding author.

Manuscript received February 22, 2015; final manuscript received June 26, 2015; published online September 3, 2015. Assoc. Editor: Jovica R. Riznic.

ASME J of Nuclear Rad Sci 1(4), 041007 (Sep 03, 2015) (8 pages) Paper No: NERS-15-1020; doi: 10.1115/1.4031033 History: Received February 22, 2015; Accepted July 07, 2015; Online September 16, 2015

Oxygen redistribution with a high-temperature gradient is an important fuel performance concern in fast-breeder reactor (FBR) and light-water reactor (LWR) (U,Pu)O2 fuel under irradiation, and affects fuels properties, power distribution, and fuel overall performance. This paper studies the burnup dependent oxygen and heat diffusion behavior in a fully coupled way within (U,Pu)O2 FBR and LWR fuels. The temperature change shows relatively larger impact on oxygen to metal (O/M) ratio redistribution rather than O/M ratio change on temperature, whereas O/M ratio redistributions show different trends for FBR and LWR fuels due to their different deviations from the stoichiometry of oxygen under high-temperature environments.

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Figures

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Fig. 1

Simulation geometry and boundary conditions

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Fig. 2

3D temperature distribution

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Fig. 3

3D O/M ratio distribution

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Fig. 4

Steady-state radial temperature profile with different O/M ratio boundary conditions

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Fig. 5

Steady-state O/M ratio distribution with different O/M ratio boundary conditions

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Fig. 6

Fuel inner surface transient temperature profile with different O/M ratio boundary conditions

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Fig. 7

Fuel inner surface transient O/M ratio distribution with different O/M ratio boundary conditions

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Fig. 8

3D temperature distribution

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Fig. 9

3D O/M ratio distribution

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Fig. 10

Steady-state radial temperature profile with different O/M ratio boundary conditions

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Fig. 11

Steady-state O/M ratio distribution with different O/M ratio boundary conditions

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Fig. 12

Fuel inner surface transient temperature profile with different O/M ratio boundary conditions

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Fig. 13

Fuel inner surface transient O/M ratio distribution with different O/M ratio boundary conditions

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