STUDY OF LEACHING BEHAVIOR FROM CONCRETE CONTAMINATED WITH CS USING NEUTRON ACTIVATION ANALYSIS AND STUDY OF CS ADSORPTION SITES BY USING FINITE ELEMENT METHOD ANALYSIS.

抄録

Cesium (Cs) penetration and leaching experiments on concrete of reactor containment structural materials are contributed to understanding of contamination mechanism by radioactive materials, which is one of six important issues identified by the Nuclear Damage Compensation and Decommissioning Facilitation Corporation (NDF). Accurately understanding distribution of Cs in concretes is important in order to decide how to proceed the Fukushima Daiichi (1F) NPP’s dismantling. The contaminated concretes are exposed to the environment changes, which means that humidity and Cs concentration around them may change depending on the climate and the plant conditions. Consequently, its penetration into them, and leaching from them repeated for long time. This complicated mechanism must be clarified.

In our presentation, the possibility will be showed that Cs penetration/leaching behavior in contaminated concretes exposed to the environment changes (humidity) like dry and wet could be complicated more. Also, the present plans to study these behaviors using INAA analysis and FEM simulation will be attached.