TOKYO: Japan’s nuclear regulator granted approval on Friday for utility Tokyo Electric Power Co. (Tepco), which ran the destroyed Fukushima Daiichi nuclear power plant, to start releasing more than a million tons of radioactive water. On Tuesday, the global watchdog, the International Atomic Energy Agency (IAEA), said a two-year review showed Japan’s plan for the release would have negligible environmental impact. The Japanese regulator’s certificate is the final step the utility required to begin the process.