Study on decay heat removal loss in a debris bed and thermal damage of a pressure lower vessel in a severe accident

• Project/Area Number: 24561043
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Kyushu University
• Principal Investigator: MATSUMOTO Tatsuya 九州大学, 工学(系)研究科(研究院), 助教 (90325514)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 熱流動 / 過酷事故 / デブリベッド / 可視化 / 溶融 / 構造 / 安全評価 / 数値解析

Outline of Final Research Achievements

In this study, it was carried out an experiment to reproduce the melting of the solidification material to be produced by a decay heat removal loss of fuel mixed in a debris bed formed by the core disruptive accident of the nuclear reactor. In addition, it was intended that an experiment to simulate the thermal damage that a decay heat removal loss gave to a reactor vessel was carried out. An experimental setup for transient behavior observation due to the fever of the fuel simulant in the solid particle layer that simulated a debris bed was constructed. And data of the transient flow behavior in the particle layer and the temperature distribution in the particle layer were measured.