Nuclear power generation is the important source of electricity to the measure of global warming and energy security, on the other hand it is very important to keep safety due to radioactive materials inside. So utilities of nuclear power plant make very efforts to keep safety, and government of Japan (Ministry of Economy, Trade and Industry, Nuclear and Industry Safety Agency) and Japan Nuclear Energy Safety Organization (hereinafter referred to as JNES) regulate the activities of utilities by reviewing establishment license and design and construction approval, pre-use inspection, operational safety inspection, periodic inspection and so on at all stage of design, construction, operation and decommissioning. At this time, the activities on keeping safety are introduced through the activities of JNES in the following four fields those are improved inspection system, human factor, seismic safety and high utilization of safety information.
