[2C09-13] Decommissioning Technology for Fukushima 2

[2C09] Assembling Analysis system for behavior of water-containing fuel debris

*Toru Ogawa¹ (1. JEAE)

Keywords:Fuel debris, Discrete element analysis, Radiation transport, Radiolysis, Hydrogen

Fuel debris after post accident has wide-ranging characters depending on the accident progression paths. Their physical forms should also vary due to retrieval methods. With those changing variables, proper management methods have to be selected. Besides, the long-term alterations of fuel debris have to be considered. In the analytical system, DEM(discrete element method) is applied to simulate water-containing debris of arbitrary particle-size distribution. Monte Carlo particle transportation analysis is applied before and after water draining. The simulation canbe made for both experimental and real systems. Application of radiolysis reactions and chemical thermodynamic analyses are also examined for hydrogen generation and debris chemical changes.