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This content will become publicly available on March 1, 2019

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

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. Here, 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.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ; ORCiD logo [8] ;  [9] ;  [10] ; ORCiD logo [11]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering; Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate
  4. Institut de Radioprotection et de surete Nucleaire (IRSN), Cadarache, St-Paul Lez Durance (France)
  5. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
  6. Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-lez-Durance (France). Centre de Cadarache
  7. CANDESCO, Division of Kinectrics Inc., Toronto (Canada)
  8. Hungarian Academy of Sciences, Budapest (Hungary). Fuel and Reactor Materials Department, Centre for Energy Research
  9. Idaho National Lab. (INL), Idaho Falls, ID (United States). Fuel Modeling and Simulation
  10. Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering
  11. Canadian Nuclear Laboratories, Chalk River, ON (Canada). Computational Techniques
Publication Date:
Report Number(s):
PNNL-SA-129199
Journal ID: ISSN 0022-3115; PII: S0022311517313405
Grant/Contract Number:
NE0000731; AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 504; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1432508