For this Fukushima disaster, we can discuss about the Legal System for Nuclear Safety Regulations in Japan. In 1995, Atomic Energy Basic Law was established to contribute to enhancing the welfare of human society and improving the standard of living by promoting the Research & Development (R&D) and utilization of atomic energy. The regulations to ensure the safety and peaceful utilization of atomic energy are fundamentally enforced both under the Law for the Regulations of Nuclear Source Material, Nuclear Fuel Material and Reactors, and the Law concerning Prevention of Radiation Hazards due to Radioisotopes, etc. Below is the structure of Legal System for Nuclear Safety Regulations in Japan. By referring to this structure, we can conclude that Japan government are well prepared enough to handle the nuclear power plant in their country. This Regulation had covered everything that needed for a nuclear power plant. From a