About 300 tons of contaminated water was found to have leaked from one of the tanks at the wrecked Fukushima Dai-ichi plant on Monday. The leak is the fifth, and the worst, since last year, but Inose said it is not a threat to Tokyo's Olympic plans.
"Regarding food and water in Tokyo there is absolute safety and the data is available," Inose said. "As far as hosting the games, the situation in Fukushima will not affect Tokyo."
Tokyo, Istanbul and Madrid are bidding to host the 2020 Olympics. The IOC will select the host city by secret ballot Sept. 7 in Buenos Aires, Argentina.
Inose said data show that radiation levels in Tokyo are the same as those in London, Paris and New York. Fukushima is 155 miles north of Tokyo.
The plant had multiple meltdowns following a massive earthquake and tsunami in March 2011—a level 7 "major accident" and the worst since Chernobyl in 1986.
Japan is pledging tighter nuclear safety. Most of Japan's nuclear plants remain closed after they were shut for safety checks following the Fukushima disaster.