TEPCO was so desperate to recruit workers for Fukushima I Nuclear Power Plant that it hired people who didn't even "exist". Or rather, workers used pseudonyms at Fukushima I so that they could keep working at other nuke plants later without the radiation limit restricting them from working elsewhere.
Mainichi Shinbun Japanese (6/24/2011) reports that 37 of 69 workers whom TEPCO cannot trace after they stopped working at the plant used bogus names.
TEPCO haven't been able to contact 69 workers who worked at Fukushima I Nuclear Power Plant in March and whose internal radiation levels haven't been measured. On June 24, the company announced that 37 workers out of 69 cannot be confirmed even to exist.
TEPCO's Junichi Matsumoto said, "We can't rule out the possibility that those workers used pseudonyms to hide the level of radiation exposure so that they could work at other nuclear power plants [after their work at Fukushima I]."
All 37 workers were registered as employees of TEPCO affiliate companies. But TEPCO couldn't confirm that the workers existed when the company contacted its affiliate companies.
TEPCO's affiliate companies include large manufacturers like Toshiba, Hitachi and Kandenko. They each hire subcontractors, who then hire their own subcontractors, all the way down to at least 5, 6 layers. At the bottom of the subcontracting pyramid, they are often one-man operations that find willing workers, even from far-away places like Okinawa (video is in Japanese), where there is no nuke plant.