Corrosion/Precipitation in Non-Isothermal Lead Alloy Coolant Systems

Abstract

A kinetic model was developed to investigate the corrosion and precipitation in non-isothermal lead alloy coolant systems. By considering a turbulent core region and a laminar sub-layer, analytical solutions of the mass transfer equations in both regions were obtained. The analytical expressions of both the local corrosion/ precipitation rate and the bulk concentration were obtained from the present kinetic model. Numerical models were also developed for simulating the corrosion and precipitation in non-isothermal Lead alloy pipe/loop systems and the results were compared with the analytical solutions. By applying this model to a test loop named "DELTA" set up at the Los Alamos National Laboratory the present study illustrates systematically dependence of the corrosion/precipitation rate and bulk concentration on the axial temperature profile and other hydraulic factors. The results were compared with the available experimental data.