Nuclear accidents may occur more often as atomic technology spreads and countries build more reactors, International Atomic Energy Agency Director General Yukiya Amano said.“Member states are considering the introduction of nuclear power plants,” Amano said during a May 14 interview in his 28th-floor office overlooking Vienna. “We cannot exclude accidents. If there are more, we have certain risks.”The IAEA expects as many as 25 nations to start developing nuclear-power facilities by 2030. The total global investment in building new atomic plants is about $270 billion, the Arlington, Virginia-based Pew Center on Global Climate Change said on Feb. 17. Interest in nuclear power is growing at the fastest rate since the Three Mile Island accident in the U.S. in 1979 and the Chernobyl explosion in Ukraine in 1986, IAEA statistics show.