コアキャッチャーによる原子炉格納容器底部損傷防止に関する研究
Study on Compact-Type Core Catcher for Current Nuclear Power Plants
著者:
倉 佑希 Yuki KURA 奈良林 直 Tadashi NARABAYASHI 千葉 豪 Go CHIBA 林 司 Tsukasa HAYASHI 藤岡 隆 Takashi HUJIOKA 今野 隆博 Takahiro KONNO 西田 浩二 Koji NISHIDA
発刊日:
公開日:
Core catcherFEMFukushima Daiichi nuclear power plantRefractory brickSevere accidentthermal shock
概要
During the Fukushima Daiichi Nuclear Power Plant accident, fuels in the each core in units 1, 3 and 2 melted, and the melted core might dropped down into the lower plenum of the RPV. The core debris heated the bottom structure of reactor vessels and dropped down onto the pedestal through the melted pass of the vessel bottom structure. High temperature core debris might attack concrete or PCV bottom. In order to protect core concrete reaction, several types of core catchers were developed, but they are too thick to be installed in a current pedestal space. In this study, a simplified core catcher concept was proposed by using the refractory brick and water injection into the bottom of the pedestal. By simulating the molten core, we used thermite-process to make high temperature molten materials onto MgO-C refractory bricks.. We found severe thermal shock on the surface of the bricks by using FEM analysis. But the refractory brick showed good robustness under such conditions. We also analyzed core catcher under accident situation of Fukushima Daiichi NPP accident.
