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

Although performance of nuclear power stations has been increased dramatically due to high reliability of the plant system and equipment in recent years, the troubles related to human performance are still reported at present. It becomes therefore, important to analyze the trouble experiences related to human performance and to share those lessons learned among maintenance personnel in order to secure the safety of nuclear power stations. In this study, error management analysis was carried out using trou...
英字タイトル:
Study on analysis method and its application for effective utilization of trouble experiences in maintenance work at nuclear power stations

Abstract Maintenance is an activity to keep the functions of systems, structures and components against aging phenomena. Maintenance has so far been carried out based on experience of the experts mainly engaged in the plant. However in order to make a suitable maintenance program, it is necessary to predict the future based on past knowledge and past research data. Then, it is necessary to regard m aintenance as sciences and to systematize maintenance, that is, maintenology needs to be constructed. As the ...
英字タイトル:
The Future Activity for Construction of Maintenology