Preliminary Experimental Study On The Model Of Deposition And Migration Of Corrosion Products In Fusion Reactor Source Item Analysis Program

Studies have shown that corrosion products are the main influence factor in the source item analysis under operation condition of fusion reactors.On account of when the coolant flows through the core,corrosion products could be activated,so that corrosion products may be due to their deposition and migration in reactor coolant loop,making radioactive dose increased.At present,the project of fusion reactor experiment(CFETR)is carrying out in our country,in which the study of analysis of radioactive source item and assessment of radiation dose is one of the key technology.So for the behavior of deposition and migration of corrosion products in fusion reactors,it is necessary to carry out related experimental study.This paper first makes a research of working conditions of domestic and foreign existing fusion test reactor's design parameters and concept design of PPCS.Adopt the international thermonuclear fusion reactor experiment 's(ITER)main coolant circuit parameters,setting as the experimental condition.Then set the self-designed loop up.After formulating detailed experimental scheme,magnetite particles(Fe3O4)are used to simulate the corrosion products and lithium hydroxide(LiOH)are uesd as a p H regulator.At last oxide skin thickness gauge is adopted as the measuring tool to study the synergy of temperature and p H,particle size and curvature how these factors effect on deposition and migration behavior of corrosion products.In the end,research of existing deposition and migration experiment and model is made.The corrected calculation of theoretical model is made.The experiment shows that the synergy of temperature and p H is relatively obvious on deposition.A large proportion of deposition thickness increases with temperature rising.With pH increasing,deposition thickness initially increases and then decreases,indicating that with the influence of p H,deposition thickness exists an inflection point.For two kinds of particle size of magnetite particles,particle size in 5 microns is easier than in 10 microns to form depositition.At the same time,the bigger the pipeline's curvature,the bigger the deposition thickness.Results of theoretical model when p H=7.00 are caculated,which are in the same order of magnitude 10-6m with experimental results.Finally,empirical formula is given according to experimental results.In further work,experimental data will be combined with empirical formula of depostion thickness,in order to be adopted in CATE program's database and calculation.