A year after Japan's worst nuclear power disaster struck the village of Tokai, Ibaraki Prefecture, a nuclear safety critic said Friday that sufficient measures have yet to be taken to prevent a similar accident from occurring.
Today marks the first anniversary of the disaster, in which a nuclear chain reaction hit critical mass, releasing radiation 20,000 times higher than normal.
The reaction began at a processing facility -- not a power plant -- when three workers sidestepped safety procedures and added an unusually large amount of a nitric acid solution to a uranium compound.