MODELING THE EFFECT OF HYDROGEN ON CREEP BEHAVIOR OF ZIRCALOY CLADDING

VenkatRao Mallipudi, Stéphane Valance, Johannes Bertsch

Abstract

During dry storage of used nuclear fuel, creep is the most likely degradation mechanism for the zirconium alloy fuel cladding. The cladding integrity during dry storage depends on the internal fuel rod pressure, the temperature, the amount of oxidation, irradiation hardening and the content of hydrogen which has been taken up during in-reactor operation. In this paper, the effect of hydrogen on the creep behavior of zirconium alloy cladding material was investigated at the temperature of 400°C. Depending on temperature, hydrogen can be found in the material under the form of solid solution and/or precipitated hydride. To capture this phenomenon, a numerical mesoscale model of the hydrogenated material has been built using the Finite Element (FE) method. The numerical setup explicitly describes the hydrides as an inclusion in a hydrogenated matrix. The matrix creep behavior follows combined Norton-Bailey creep rules whereas the hydrides are considered to be elastic material. The creep law was defined in FE Code ABAQUS using the user subroutine CREEP. The comparison of predicted creep behavior obtained from FE showed good agreement with the results reported in literature. Particularly, our model is able to seize the competition between the creep strain rate enhancement induced by hydrogen in solid solution and its reduction due to precipitated hydrogen.

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Paper Citation


in Harvard Style

Mallipudi V., Valance S. and Bertsch J. (2011). MODELING THE EFFECT OF HYDROGEN ON CREEP BEHAVIOR OF ZIRCALOY CLADDING . In Proceedings of 1st International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH, ISBN 978-989-8425-78-2, pages 293-299. DOI: 10.5220/0003615402930299


in Bibtex Style

@conference{simultech11,
author={VenkatRao Mallipudi and Stéphane Valance and Johannes Bertsch},
title={MODELING THE EFFECT OF HYDROGEN ON CREEP BEHAVIOR OF ZIRCALOY CLADDING},
booktitle={Proceedings of 1st International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,},
year={2011},
pages={293-299},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003615402930299},
isbn={978-989-8425-78-2},
}


in EndNote Style

TY - CONF
JO - Proceedings of 1st International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,
TI - MODELING THE EFFECT OF HYDROGEN ON CREEP BEHAVIOR OF ZIRCALOY CLADDING
SN - 978-989-8425-78-2
AU - Mallipudi V.
AU - Valance S.
AU - Bertsch J.
PY - 2011
SP - 293
EP - 299
DO - 10.5220/0003615402930299