Workers at Japan's Fukushima Daiichi plant exposed to radiation above past limit --Six workers at the nuclear power plant have been exposed to radiation beyond the previous limit for an emergency operation, Tokyo Electric Power Co. says. 19 Mar 2011 Six workers at Japan's Fukushima Daiichi nuclear power plant have been exposed to radiation beyond the previous limit for an emergency operation, Tokyo Electric Power Co. said Saturday. Kyodo News reported the employees, whose job titles were not known, were continuing to work despite having been exposed to more than 100 millisieverts of radiation. The Health, Labor and Welfare Ministry raised the exposure limit to 250 millisieverts for the current nuclear crisis.