A new non-diffusional gas bubble production route in used nuclear fuel: Implications for fission gas release, cladding corrosion, and next generation fuel design

Jon M. Schwantes, Jacob L. Bair, Edgar C. Buck, Ram Devanathan, Sean H. Kessler, Timothy G. Lach, Jason M. Lonergan, Bruce K. McNamara, Camille J. Palmer, Richard A. Clark

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A novel relationship between noble metal phase particles and fission gas bubble production in used nuclear fuel is described. The majority of Te atoms within noble metal phase undergo radioactive decay to form stable Xe within a few hours after particle formation. This results in the production of clusters of Xe atoms contained within the solid metal matrix exhibiting an equivalent gas bubble pressure approaching 1 GPa. These high pressure bubbles are stabilized by the UO2 within the bulk of the fuel. However, when these bubbles form near the fuel/cladding interface, in combination with local and temporal damage caused by fission recoil, they are capable of overcoming the fracture strength of the UO2 and rupturing catastrophically. The force of the resulting bubble rupture is sufficient to eject noble metal phase particles several microns into the cladding. This proposed mechanism explains the observance of noble metal phase in cladding and is consistent with a host of morphological features found near the fuel/cladding interface.

Original languageEnglish (US)
Pages (from-to)6086-6099
Number of pages14
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number11
DOIs
StatePublished - Mar 21 2020

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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