Establishment and verification of chemical interaction model between fast reactor fuel and cladding under high burnup

BackgroundUranium dioxide fuel elements of fast neutron reactor operate under the conditions of high burnup, high neutron fluence rate, high line power and high temperature. Complex physical chemical interactions occur between fuel and the cladding materials. The establishment of fuel element chemical interaction model is very important for the design of high burnup fast reactor fuel element.PurposeThis study aims to establish a chemical interaction model between fast reactor fuel and cladding materials under high burnup.MethodsEmphasis was placed on the chemical interaction phenomenon of the oxide fuel elements of fast neutron reactors. Firstly, the chemical interaction models of uranium dioxide interacted with austenitic stainless steel and ferritic-martensitic steel cladding materials were established by using a dynamic model. Then, special fuel element performance analysis program FIBER-Oxide, developed by China Institute of Atomic Energy (CIAE), was employ to verify these chemical interaction models by e