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Title: Unit mechanisms of fission gas release: Current understanding and future needs

Abstract

Gaseous fission product transport and release has a large impact on fuel performance, degrading fuel properties and, once the gas is released into the gap between the fuel and cladding, lowering gap thermal conductivity and increasing gap pressure. While gaseous fission product behavior has been investigated with bulk reactor experiments and simplified analytical models, recent improvements in experimental and modeling approaches at the atomistic and mesoscales are being applied to provide unprecedented understanding of the unit mechanisms that define the fission product behavior. In this article, existing research on the basic mechanisms behind the various stages of fission gas release during normal reactor operation are summarized and critical areas where experimental and simulation work is needed are identified. This basic understanding of the fission gas behavior mechanisms has the potential to revolutionize our ability to predict fission product behavior during reactor operation and to design fuels that have improved fission product retention. In addition, this work can serve as a model on how a coupled experimental and modeling approach can be applied to understand the unit mechanisms behind other critical behaviors in reactor materials.

Authors:
ORCiD logo; ; ; ; ; ; ; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1434864
Report Number(s):
PNNL-SA-129199
Journal ID: ISSN 0022-3115; NT0511000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 504; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
nuclear fuel; Fission Gas Release; computer simulation

Citation Formats

Tonks, Michael, Andersson, David, Devanathan, Ram, Dubourg, Roland, El-Azab, Anter, Freyss, Michel, Iglesias, Fernando, Kulacsy, Katalin, Pastore, Giovanni, Phillpot, Simon R., and Welland, Michael. Unit mechanisms of fission gas release: Current understanding and future needs. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.03.016.
Tonks, Michael, Andersson, David, Devanathan, Ram, Dubourg, Roland, El-Azab, Anter, Freyss, Michel, Iglesias, Fernando, Kulacsy, Katalin, Pastore, Giovanni, Phillpot, Simon R., & Welland, Michael. Unit mechanisms of fission gas release: Current understanding and future needs. United States. doi:10.1016/j.jnucmat.2018.03.016.
Tonks, Michael, Andersson, David, Devanathan, Ram, Dubourg, Roland, El-Azab, Anter, Freyss, Michel, Iglesias, Fernando, Kulacsy, Katalin, Pastore, Giovanni, Phillpot, Simon R., and Welland, Michael. Fri . "Unit mechanisms of fission gas release: Current understanding and future needs". United States. doi:10.1016/j.jnucmat.2018.03.016.
@article{osti_1434864,
title = {Unit mechanisms of fission gas release: Current understanding and future needs},
author = {Tonks, Michael and Andersson, David and Devanathan, Ram and Dubourg, Roland and El-Azab, Anter and Freyss, Michel and Iglesias, Fernando and Kulacsy, Katalin and Pastore, Giovanni and Phillpot, Simon R. and Welland, Michael},
abstractNote = {Gaseous fission product transport and release has a large impact on fuel performance, degrading fuel properties and, once the gas is released into the gap between the fuel and cladding, lowering gap thermal conductivity and increasing gap pressure. While gaseous fission product behavior has been investigated with bulk reactor experiments and simplified analytical models, recent improvements in experimental and modeling approaches at the atomistic and mesoscales are being applied to provide unprecedented understanding of the unit mechanisms that define the fission product behavior. In this article, existing research on the basic mechanisms behind the various stages of fission gas release during normal reactor operation are summarized and critical areas where experimental and simulation work is needed are identified. This basic understanding of the fission gas behavior mechanisms has the potential to revolutionize our ability to predict fission product behavior during reactor operation and to design fuels that have improved fission product retention. In addition, this work can serve as a model on how a coupled experimental and modeling approach can be applied to understand the unit mechanisms behind other critical behaviors in reactor materials.},
doi = {10.1016/j.jnucmat.2018.03.016},
journal = {Journal of Nuclear Materials},
number = C,
volume = 504,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2018},
month = {Fri Jun 01 00:00:00 EDT 2018}
}