Young's modulus evaluation of high burnup structure in UO2 with nanometer resolution

The mechanical properties of a well-characterized irradiated light water reactor fuel pin with an average burnup of 72 MWd/kgU were investigated by utilizing nano-indentation technique. Young's modulus and hardness are reported as functions of radial positions covering from mid radial position...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 508; no. -
Main Authors Terrani, Kurt A., Balooch, Mehdi, Burns, Joseph R., Smith, Quinlan B.
Format Journal Article
LanguageEnglish
Published United States Elsevier 03.04.2018
Subjects
Elastic modulus
Hardness
High burnup fuel
Nano-indentation
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
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Summary:The mechanical properties of a well-characterized irradiated light water reactor fuel pin with an average burnup of 72 MWd/kgU were investigated by utilizing nano-indentation technique. Young's modulus and hardness are reported as functions of radial positions covering from mid radial position in the urania pellet to high burnup structure, fuel-cladding chemical interaction zone and zirconium-based cladding. Here, by probing microstructure of the high burnup zone, the mechanical properties of sub-grains and the interaction between them were examined at the nanometer scale. Force-displacement curves from each of these individual sub-grains suggest they resemble single crystal UO2. However, these restructured grains are weakly bonded to their neighbors.
Bibliography:USDOE
AC05-00OR22725
ISSN:0022-3115
1873-4820