SWELLING PREDICTION OF AISI 304 AND 18Cr10NiTi AUSTENITIC STAINLESS STEELS USING VARIOUS EMPIRICAL FUNCTIONS

Abstract

A review of the known empirical dependences of austenitic steel swelling on in-reactor environments is carried out. The performance of empirical functions is compared in application to the conditions of thermal neutron reactor internals. Comparison with experimental data is made, and the influence of statistical errors of reactor data is discussed. Finally, the applicability of the empirical functions in the space of external parameters, precisely temperature, dose, and dose rate, is investigated.

Numerical Modeling of Hidden Damage Accumulation Due to Radiation Exposure and Hydrogen Embrittlement

“…Then, having the value of the decrease of the modulus of elasticity with time, it is possible to introduce the function of the decrease of the cross section of the specimen f(A)=A(1 h) dependent on it, formally transferring the term to the value of the area A and considering that the current value of the stress is . (11) This provides an opportunity to proceed to the use of the main CDM hypothesis regarding the effect of the effective stress on the long-term strength of the material during its damage accumulation over time [13]:…”

“…It is emphasized that without irradiation, the so-called IASCC (irradiation assisted stress corrosion cracking) damage did not occur in the steel, but areas of intercrystalline fracture, typical of the IASCC phenomenon, appeared on the irradiated specimens. In [11], it is also emphasized that type 304 steels are susceptible to damage due to IASCC.…”