福島第一原発 1 号機における非常用復水器の冷却性能評価 に関する研究
Study on Evaluation of Cooling Capacity of Isolation Condenser in Fukushima Daiichi Unit 1
著者:
山本 泰功 Yasunori YAMAMOTO 奈良林 直 Tadashi NARABAYASHI 倉 佑希 Yuki KURA 千葉 豪 Go CHIBA
発刊日:
公開日:
Core coolingFukushima DaiichiIsolation CondenserTRAC-BF1Unit 1
概要
In the Fukushima Daiichi Nuclear Power Plant unit 1, isolation condenser (IC) should play an important role in core cooling during the station blackout. To evaluate cooling capacity of the IC, two phase flow analyses with the TRAC-BF1 code and experiments simulating the IC were conducted. The analyses for the actual BWR indicated that the decay heat could be removed if the IC worked properly at 18:18. However, our results showed that core uncovery occurred at 17:30, which leaded to hydrogen production from the heated core. Further efforts should be made to properly consider the effect of hydrogen accumulation on degradation of core cooling. In the experiments, natural convection observed and the heat could be removed by the IC at high pressure conditions.
