STUDY OF THERMAL CREEP OF COATED CLADDING MATERIALS

Martin Ševeček, Koroush Shirvan, Ronald G. Ballinger

Abstract


Coated cladding materials are considered as a near-term concept for so-called Accident Tolerant Fuel materials. Their behavior in accidental conditions is mainly studied around the world, however, they need to survive in-reactor normal operation before reaching theoretical accidental conditions. An out-of-pile experiment was designed to study accelerated inward thermal creep and outward displacement of a cladding that occurs after pellet-cladding interaction. Four different materials deposited by the cold-spray technique were studied as well as the reference uncoated one. The results confirm theoretical prediction that due to a mismatch between the fundamental physical properties of each layer, high stresses will build up and the plastic strains expected will lead to coating cracking.

Keywords


Accident Tolerant Fuel, Fuel Cladding, Creep, Coating

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ISSN 2336-5382 (Online)
Published by the Czech Technical University in Prague