日本原子力研究開発機構
The villages of Muramatsu and Ishigami were created with the establishment of the modern municipalities system on April 1, 1889. On March 31, 1955, the two villages merged to form the village of Tōkai. In 1956, Japan Atomic Energy Research Institute was established at Tōkai. After JRR-1, the first nuclear reactor in Japan, reached criticality, many nuclear-related facilities such as Japan Atomic Energy Agency, Japan Atomic Power Company Tokai Power Station and Tokai No. 2 Power Station have been concentrated in the village, which became the base of the Japanese nuclear industry. The village was the site of the Tokaimura nuclear accident which occurred at the JCO nuclear reprocessing plant on 30 September 1999, which killed two people.