TOKYO — Japan underestimated the danger of tsunamis and failed to prepare adequate backup systems at the Fukushima Daiichi nuclear plant, a team of inspectors from an international nuclear regulator said Wednesday in a critical report that was released as the Japanese prime minister prepared to face a no-confidence vote in Parliament.
In its preliminary report on the nuclear crisis, which echoed earlier criticisms of Japan’s inadequate safety measures, the team, from theInternational Atomic Energy Agency in Vienna, also called for stronger regulatory oversight. Steps should be taken, it said, to ensure that “regulatory independence and clarity of roles are preserved in all circumstances.”