A improved equation of state for Xe gas bubbles in γU-Mo fuels

Beeler, Benjamin W; Hu, Shenyang; Zhang, Yongfeng; Gao, Yipeng

doi:10.1016/j.jnucmat.2019.151961

Title: A improved equation of state for Xe gas bubbles in γU-Mo fuels

Journal Article · 20 December 2019 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2019.151961 · OSTI ID:1631168

^[1]; Hu, Shenyang ^[2];

^[3];

^[3]

Idaho National Lab. (INL), Idaho Falls, ID (United States); North Carolina State Univ., Raleigh, NC (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

A monolithic fuel design based on a U-Mo alloy has been selected as the fuel type for conversion of the United States High-Performance Research Reactors (HPRRs). An issue with U-Mo monolithic fuel is the large amount of swelling that takes place during operation. The accurate prediction of fuel evolution under irradiation requires implementation of correct thermodynamic properties into mesoscale and continuum level fuel performance modeling codes. However, the thermodynamic properties of the fission gas bubbles (such as the relationship among bubble size, equilibrium Xe concentration, and bubble pressure) are not well known. This work studies Xe bubbles in ?U-Mo from a diameter of 3 nm up to 8.5 nm and from 400 K up to 700 K. The energetic relationship of Xe bubbles with regard to voids and Xe substitutional atoms is described. The transition is also determined for when a bubble becomes over-pressurized. Finally, an equation of state is fit to the pressure as a function of molar volume and temperature.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: DE-AC07-05ID14517; AC07-05ID14517

OSTI ID:: 1631168

Alternate ID(s):: OSTI ID: 1580307

Report Number(s):: INL/JOU-19-54707-Rev000; TRN: US2200756

Journal Information:: Journal of Nuclear Materials, Vol. 530, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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