[2L05-09] Numerical Analysis

[2L09] Numerical Analysis of Oxide Layers Growth and Dissolution Rates in Flowing Lead-Bismuth Eutectic

(1) Implementation of oxide layers growth and dissolution models in ANSYS Fluent code

*Nao Watanabe¹, Kenji Nishihara¹, Hiroyuki Yoshida¹ (1. JAEA)

Keywords:Lead-bismuth eutectic, T91, Oxide layer, Diffusion, CFD

In the design of a reactor using lead-bismuth eutectic (LBE) as a coolant, estimating corrosion rate of structural materials is an important issue in considering safety and the life of the entire structure. Oxide layers formed on the surface of T91 steel have corrosion inhibition effect, however, if they dissolve, the corrosion can progress rapidly. Growth and dissolution rates of oxide layers depend on temperature and oxygen concentration, especially under static LBE, a semi-mechanical model of these rates has been developed. However, knowledge of them in flow filed is limited. This study aims to estimate them in flowing LBE by CFD. In this report, results of analysis by ANSYS Fluent code implementing the existing model of these rates are described.