An explosion on Monday at Japan's disaster-hit nuclear plant may have damaged the primary containment vessel of one reactor unit, the Vienna-based U.N. nuclear watchdog said.
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The International Atomic Energy Agency said the explosion at the Fukushima Daiichi unit 2 "may have affected the integrity of its primary containment vessel."
The IAEA said primary containment vessels of units 1 and 3 appeared intact despite explosions there. It said units at the Fukushima Daini, Onagawa, and Tokai nuclear power plants were in a safe and stable condition.