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

Michael Tonks, David Andersson, Ram Devanathan, Roland Dubourg, Anter El-Azab, Michel Freyss, Fernando Iglesias, Katalin Kulacsy, Giovanni Pastore, Simon R. Phillpot, Michael Welland

Research output: Contribution to journalReview articlepeer-review

78 Citations (SciVal)


Gaseous fission product transport and release has a large impact on fuel performance, degrading fuel and gap properties. 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 beginning to reveal new understanding of the unit mechanisms that define fission product behavior. Here, existing research on the basic mechanisms of fission gas release during normal reactor operation are summarized and critical areas where 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 and to design fuels with improved performance. 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.

Original languageEnglish (US)
Pages (from-to)300-317
Number of pages18
JournalJournal of Nuclear Materials
StatePublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • General Materials Science
  • Nuclear Energy and Engineering


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