ナトリウム冷却高速炉のシビアアクシデント一貫解析による格納容器設計最適化

抄録

The design of a containment vessel in a sodium-cooled fast reactor was optimized from numerical analysis on the hypothetical severe accident including sodium leakage and combustion. The analysis method is one of the base technologies of the design optimization system, ARKADIA, which integrates artificial intelligence, numerical analysis, and knowledge base. The numerical analysis was performed on the different design conditions including volume of the containment vessel and the safety equipment as optimization parameters. Atmosphere pressure in the containment vessel was selected as a safety evaluation figure. The combustion of the leaked sodium from the primary piping increases atmosphere pressure both in the compartment below a floor level and the upper compartment of the containment vessel. The iterative numerical analysis successfully found that the safety under this accident was kept even in the downsized containment vessel by selecting an effective safety equipment. This numerical analysis demonstrated the basic capability of design optimization in ARKADIA.