Research Papers

Simulation on Pellet–Cladding Mechanical Interaction of Accident Tolerant Fuel With Coated Cladding

[+] Author and Article Information
Yangbin Deng, Dalin Zhang, Wenxi Tian, G. H. Su, Suizheng Qiu

Shaanxi Key Laboratory of Advanced Nuclear
Energy and Technology,
School of Nuclear Science and Technology,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi, China

Yingwei Wu

Shaanxi Key Laboratory of Advanced Nuclear
Energy and Technology,
School of Nuclear Science and Technology,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi, China
e-mail: wyw810@mail.xjtu.edu.cn

1Corresponding author.

Manuscript received November 10, 2017; final manuscript received July 15, 2018; published online January 24, 2019. Assoc. Editor: Guoqiang Wang.

ASME J of Nuclear Rad Sci 5(1), 011015 (Jan 24, 2019) (8 pages) Paper No: NERS-17-1293; doi: 10.1115/1.4041194 History: Received November 10, 2017; Revised July 15, 2018

In this study, based on the code Fuel ROd Behavior Analysis (FROBA), a thermal–mechanical analysis code initially developed for traditional UO2-Zr fuel elements by our research group, a modified version was developed to perform the fuel performance simulation of accident tolerant fuels (ATFs), named FROBA-ATF. Compared with initial version, the cladding could be divided into arbitrary number control volumes with different materials in the new code, so it can be used to perform the calculation for multilayer coatings. In addition, a new nonrigid pellet–cladding mechanical interaction (PCMI) calculation model was established in the new code. The FROBA-ATF code was used to predict PCMI performance of two kind fuels with coated claddings, including the internal surface coating and external surface coating. The calculation result indicates that because the coating surface was close to the inner surface of the cladding where also was the PCMI surface, the absolute value of the combine pressure of internal surface-coated cladding was substantial larger than that of the external surface-coated cladding, which might be harmful the coating behavior. However, the internal surface-coated mode can provide a protection for alloy due to the isolation from direct contact with fuel pellets, which can result in a much lower equivalent stress of zirconium body during the PCMI.

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Fig. 1

Node partition of the computational domain

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Fig. 2

Node partition of multilayer structure body

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Fig. 3

Pellet–cladding mechanical interaction calculation diagram in the modified FROBA code

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Fig. 4

Von Mises stress (Pa) profile of fuel in PCMI situation

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Fig. 5

Radial stress comparison

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Fig. 6

Axial stress comparison

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Fig. 7

Contact pressure comparison

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Fig. 8

Boundary conditions of benchmark

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Fig. 10

Strain comparison

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Fig. 11

Cross sections of in-coated and out-coated fuel rods

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Fig. 12

Power history during operation

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Fig. 13

Gap size variation of fuel elements with coated clad

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Fig. 14

Interfacial pressure variation of fuel elements with coated clad

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Fig. 15

Interfacial pressure between alloy and coating

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Fig. 16

Equivalent stress of clad

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Fig. 17

Comparison of contact pressure

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Fig. 18

Comparison of maximum equivalent stress



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