High Temperature Experimental Apparatus to Study Plate-out of HTGR Metallic Fission Product

It is therefore important to be able to quantify the plate-out FP(Metallic fission product) on primary components in source term estimations for HTGR, particularly in design basis accidents (DBA). Although FP interactions with primary components have been a subject of study for more than four decades, the prediction of FP interactions with alloy surfaces is empirical and still incomplete. It is usual to test the interaction of a specific FP with a specific material at different temperatures to generate data on interaction kinetics as a function of temperature. Each material, each FP and each of its compound form have different kinetics and so, potentially, very large number of experiments are necessary. It should be understood that the empirical knowledge of FP–alloy interactions makes no distinction between the different adsorption/ absorption/reaction mechanisms. KAERI prepare a lab-scale apparatus to study plate-out characteristics of metallic FP focused on the heat exchanger which is the major plate-out component of HTGR. The apparatus is an out-of-pile test device and is able to simulate HTGR core temperature at helium flow condition or argon flow condition. KAERI has prepare a lab-scale apparatus to study plate-out characteristics of metallic FP on the HTGR heat exchanger. The apparatus is an out-of-pile test device and is able to simulate HTGR core temperature at gas flow condition.