Microhardness and Young's modulus of high burn-up UO2 fuel

F. Cappia; D. Pizzocri; M. Marchetti; A. Schubert; P. Van Uffelen; L. Luzzi; D. Papaioannou; R. Macián-Juan; V. V. Rondinella

doi:10.1016/j.jnucmat.2016.07.015

Microhardness and Young's modulus of high burn-up UO₂ fuel

F. Cappia, D. Pizzocri, M. Marchetti, A. Schubert, P. Van Uffelen, L. Luzzi, D. Papaioannou, R. Macián-Juan, V. V. Rondinella

Chair of Nuclear Technology

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Vickers microhardness (HV_0.1) and Young's modulus (E) measurements of LWR UO₂ fuel at burn-up ≥60 GWd/tHM are presented. Their ratio HV_0.1/E was found constant in the range 60–110 GWd/tHM. From the ratio and the microhardness values vs porosity, the Young's modulus dependence on porosity was derived and extended to the full radial profile, including the high burn-up structure (HBS). The dependence is well represented by a linear correlation. The data were compared to fuel performance codes correlations. A burn-up dependent factor was introduced in the Young's modulus expression. The modifications extend the experimental validation range of the TRANSURANUS correlation from un-irradiated to irradiated UO₂ and up to 20% porosity. First simulations of LWR fuel rod irradiations were performed in order to illustrate the impact on fuel performance. In the specific cases selected, the simulations suggest a limited effect of the Young's modulus decrease due to burn-up on integral fuel performance.

Original language	English
Pages (from-to)	447-454
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	479
DOIs	https://doi.org/10.1016/j.jnucmat.2016.07.015
State	Published - 1 Oct 2016

Keywords

High burn-up UO fuel
TRANSURANUS
Vickers microhardness
Young's modulus

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title = "Microhardness and Young's modulus of high burn-up UO2 fuel",

abstract = "Vickers microhardness (HV0.1) and Young's modulus (E) measurements of LWR UO2 fuel at burn-up ≥60 GWd/tHM are presented. Their ratio HV0.1/E was found constant in the range 60–110 GWd/tHM. From the ratio and the microhardness values vs porosity, the Young's modulus dependence on porosity was derived and extended to the full radial profile, including the high burn-up structure (HBS). The dependence is well represented by a linear correlation. The data were compared to fuel performance codes correlations. A burn-up dependent factor was introduced in the Young's modulus expression. The modifications extend the experimental validation range of the TRANSURANUS correlation from un-irradiated to irradiated UO2 and up to 20% porosity. First simulations of LWR fuel rod irradiations were performed in order to illustrate the impact on fuel performance. In the specific cases selected, the simulations suggest a limited effect of the Young's modulus decrease due to burn-up on integral fuel performance.",

keywords = "High burn-up UO fuel, TRANSURANUS, Vickers microhardness, Young's modulus",

author = "F. Cappia and D. Pizzocri and M. Marchetti and A. Schubert and {Van Uffelen}, P. and L. Luzzi and D. Papaioannou and R. Maci{\'a}n-Juan and Rondinella, {V. V.}",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors",

year = "2016",

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day = "1",

doi = "10.1016/j.jnucmat.2016.07.015",

language = "English",

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T1 - Microhardness and Young's modulus of high burn-up UO2 fuel

AU - Cappia, F.

AU - Pizzocri, D.

AU - Marchetti, M.

AU - Schubert, A.

AU - Van Uffelen, P.

AU - Luzzi, L.

AU - Papaioannou, D.

AU - Macián-Juan, R.

AU - Rondinella, V. V.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - Vickers microhardness (HV0.1) and Young's modulus (E) measurements of LWR UO2 fuel at burn-up ≥60 GWd/tHM are presented. Their ratio HV0.1/E was found constant in the range 60–110 GWd/tHM. From the ratio and the microhardness values vs porosity, the Young's modulus dependence on porosity was derived and extended to the full radial profile, including the high burn-up structure (HBS). The dependence is well represented by a linear correlation. The data were compared to fuel performance codes correlations. A burn-up dependent factor was introduced in the Young's modulus expression. The modifications extend the experimental validation range of the TRANSURANUS correlation from un-irradiated to irradiated UO2 and up to 20% porosity. First simulations of LWR fuel rod irradiations were performed in order to illustrate the impact on fuel performance. In the specific cases selected, the simulations suggest a limited effect of the Young's modulus decrease due to burn-up on integral fuel performance.

AB - Vickers microhardness (HV0.1) and Young's modulus (E) measurements of LWR UO2 fuel at burn-up ≥60 GWd/tHM are presented. Their ratio HV0.1/E was found constant in the range 60–110 GWd/tHM. From the ratio and the microhardness values vs porosity, the Young's modulus dependence on porosity was derived and extended to the full radial profile, including the high burn-up structure (HBS). The dependence is well represented by a linear correlation. The data were compared to fuel performance codes correlations. A burn-up dependent factor was introduced in the Young's modulus expression. The modifications extend the experimental validation range of the TRANSURANUS correlation from un-irradiated to irradiated UO2 and up to 20% porosity. First simulations of LWR fuel rod irradiations were performed in order to illustrate the impact on fuel performance. In the specific cases selected, the simulations suggest a limited effect of the Young's modulus decrease due to burn-up on integral fuel performance.

KW - High burn-up UO fuel

KW - TRANSURANUS

KW - Vickers microhardness

KW - Young's modulus

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DO - 10.1016/j.jnucmat.2016.07.015

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VL - 479

SP - 447

EP - 454

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Microhardness and Young's modulus of high burn-up UO₂ fuel

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Keywords

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