During their service life, fast neutron reactor oxide fuel elements operate at high neutron fluence rate, high linear power, and high temperature environment. The fuel elements will exhibit complex irradiation -thermo-mechanical coupling characteristics. The stress-strain analysis calculation is very important for the design of fast reactor fuel elements. This article focuses on the irradiation mechanical phenomenon of the oxide fuel element in the fast neutron reactor. The finite element method is used to consider irradiation creep, irradiation swelling, irradiation hardening, and short-term plastic strengthening. Nonlinear calculation of coupling irradiation-thermo-mechanical is achieved, and the correctness of the calculation method is verified through typical examples. The results show that the non-linear calculation method is correct, and can realize the analysis and prediction of the stress-strain evolution behavior of the fast neutron oxide fuel element during its entire life. The research results in this paper lay a good foundation for the design and evaluation of high linear power fast neutron oxide fuel elements.
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|Affiliation/Organization||China Institute of Atomic Energy|