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Title: High-energy synchrotron study of in-pile-irradiated U–Mo fuels

We report synchrotron scattering analysis results on U-7wt%Mo fuel samples irradiated in the Advanced Test Reactor to three different burnup levels. Mature fission gas bubble superlattice was observed to form at intermediate burnup. The superlattice constant was determined to be 11.7 nm and 12.1 nm by wide-angle and small-angle scattering respectively. Grain sub-division takes place throughout the irradiation and causes the collapse of the superlattice at high burnup. The bubble superlattice expands the lattice constant and acts as strong sinks of radiation induced defects. The evolution of dislocation loops was therefore suppressed until the bubble superlattice collapses.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Report Number(s):
INL/JOU-15-36483
Journal ID: ISSN 1359-6462; PII: S1359646215300919
Grant/Contract Number:
AC07-05ID14517; AC02-06CH11357; AC-02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; metallic nuclear fuel; recrystallization; superlattice; synchrotron radiation; X-ray diffraction
OSTI Identifier:
1367858
Alternate Identifier(s):
OSTI ID: 1460448