skip to main content

Title: Bubble formation and Kr distribution in Kr-irradiated UO2

In situ and ex situ transmission electron microscopy observation of small Kr bubbles in both single-crystal and polycrystalline UO2 were conducted to understand the inert gas bubble behavior in oxide nuclear fuel. The bubble size and volume swelling are shown as a weak function of ion dose but strongly depend on the temperature. The Kr bubble formation at room temperature was observed for the first time. The depth profiles of implanted Kr determined by atom probe tomography are in good agreement with the calculated profiles by SRIM, but the measured concentration of Kr is about 1/3 of calculated one. This difference is mainly due to low solubility of Kr in UO2 matrix, which has been confirmed by both density-functional theory calculations and chemical equilibrium analysis.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [2] ;  [4] ;  [5] ;  [6] ;  [2] ;  [3] ;  [7]
  1. Univ. of Wisconsin, Madison, WI (United States) Dept. of Engineering Physics
  2. Univ. of Florida, Gainesville, FL (United States) Dept. of Materials Science and Engineering
  3. Purdue Univ., West Lafayette, IN (United States) School of Nuclear Engineering
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Univ. of Wisconsin, Madison, WI (United States) Dept. of Engineering Physics; Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1162206
Report Number(s):
INL/JOU--14-31268
Journal ID: ISSN 0022-3115; TRN: US1500178
DOE Contract Number:
AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 456; Journal Issue: C
Publisher:
Elsevier
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 36 MATERIALS SCIENCE; KRYPTON; URANIUM DIOXIDE; BUBBLES; DENSITY FUNCTIONAL METHOD; TRANSMISSION ELECTRON MICROSCOPY; MONOCRYSTALS; TEMPERATURE RANGE 0273-0400 K; SIZE; DEPTH DOSE DISTRIBUTIONS; RADIATION DOSES; POLYCRYSTALS; SWELLING; TOMOGRAPHY; ABUNDANCE; ATOMS; KRYPTON IONS; PROBES; SOLUBILITY; TEMPERATURE DEPENDENCE TEM; UO2; BUBBLE FORMATION; KR IRRADIATED