Since Japan had very few hydraulic energy resources, breeder reactors and renewable energy were attractive technologies. However, the organization existing at the time to do such research, the Japan Atomic Energy Research Institute had been falling into an unstable situation, and tests done on nuclear power plants were limited and regulated by the companies that owned the plants. Thus PNC was created and did development work for the Monju reactor and other cutting edge projects. The breeder reactor technology was difficult to master due to the difficulty in handling of Sodium, and for a time, PNC was even called the pros of Sodium.