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...Nea nsc r chapter fuel cladding chemical interaction c gueneau j p piron dumas v bouineau f iglesias b lewis cea den dpc centre de saclay france dec cadarache university of ontario institute technology canada abstract the chemistry nuclear is very complex its composition changes with time due to formation fission products and depends on temperature level history within pellet clad during operation firstly in thermal reactors zircaloy oxidation from reaction uo under high conditions will be addressed then other phenomena occurring fast described large gradients existing between periphery induce radial redistribution constituents can react by different corrosion processes which involve actinide or product transport via gas liquid solid phases all these are briefly case kinds fuels oxide carbide nitride metallic used way taken into account performance codes presented introduction examples a first part sheathing internal neutron fps materials factors limiting lifetime pins second operating...