The agency found about the lax security as a result of an on-site investigation it conducted on July 7 after the utility was unable to contact more than 180 workers engaged in operations to bring the crippled nuclear plant under control.
The utility only checked photocopies of identification such as drivers’ licenses in judging whether workers should be allowed to enter the premises of the plant, breaching the utility’s in-house rules to prevent the theft of uranium and plutonium, the agency said in a statement.
The agency also found cases where TEPCO did not individually distribute entry passes to plant workers but handed them to their supervisors, it said.
A nuclear safety agency official said the agency, however, decided against revoking TEPCO’s license to install and operate nuclear reactors as the inadequate identification checks “do not constitute systematic and deliberate wrongdoing” and were rather a result of situations created by the crisis at the plant.
TEPCO spokesman Junichi Matsumoto told reporters “So far there has been no case of suspicious persons entering the plant’s premises.”
In late June, TEPCO alerted the nuclear safety agency that it was unable to contact some Fukushima plant workers as it sought to determine workers’ internal radiation exposure.