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...
英字タイトル:
Study on Compact-Type Core Catcher for Current Nuclear Power Plants

As part of efforts to decommissioning of the Fukushima Daiichi nuclear power plants (NPP), model enhancement of severe accident analysis code “MAAP” and accident progression analyses for Fukushima Daiichi NPP have been conducted for preparation of fuel debris retrieval. The object of this study is estimation of reactor core and containment vessel status for decision of planning the debris retrieval method based on the accident progression analysis results. This report summarizes the model improvement ...
英字タイトル:
Enhancement of Severe Accident Code MAAP and Accident Progression Analysis for Fukushima Daiichi Nuclear Power Plant