By KEITH BRADSHER, DAVID E. SANGER and WILLIAM J. BROAD
Published: March 18, 2011
As the crisis seemed to deepen, Japan’s nuclear safety agency raised the assessment of its severity from 4 to 5 on a 7-level international scale, news reports said. Level 4 is for incidents with local consequences while level denotes broader consequences. It was not immediately clear why the action had been taken. The partial meltdown at Three Mile Island in 1979 was rated 5 and the Chernobyl disaster in 1986 was rated 7.
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