Physical and Chemical Effects of Containment Debris on the Emergency Coolant Recirculation

摘要

A parametric study is performed on the effects of debris source, containment environments and debris interceptor on the overall performance of ECCS recirculation sump. The key parameters of each effect are deduced and the recommendations for reducing their adverse effects are made through the present analysis. Following conclusions can be made:(a) The amount of unqualified coating debris has a great adverse effect on the screen head loss by reducing porosity in the fibrous insulation,(b) Cal-Sil insulation reacts with TSP buffer and significantly increases the generation of a gum-like chemical precipitate,(c) Spray time increases the chemical by-products but the effect is smaller than that of buffer agent type and unqualified coating.(d) The debris interceptor, when verified, may play a vital role reducing head loss generated by coatings and fibrous debris mix.