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On the 13th, Tohoku Electric Power announced that an unscheduled operation occurred in the equipment that prevents the spread of radioactive materials during the preparation stage for a radiation monitoring inspection scheduled to be conducted at Unit 2 of the Onagawa Nuclear Power Plant. On the 13th, an inspection was scheduled to confirm the functionality of the radiation monitor at Unit 2 of the Onagawa Nuclear Power Plant, and work was being carried out inside the reactor building to ensure that signals indicating an anomaly do not reach the equipment that prevents the spread of radioactive materials. During this work, for some reason, a signal was transmitted that caused two exhaust fans in the building to operate unexpectedly. Tohoku Electric Power stated that there were no abnormalities in the values at the radiation monitors or monitoring posts, and the transmission of the signal was not caused by an increase in radiation levels. Nobuaki Watanabe, deputy director of the nuclear power department at Tohoku Electric Power Co., Ltd., said, “We will continue to investigate why such an automatic start signal was received, but if the signal is received, it means that the gas processing system is activated in an emergency as normal and for safety purposes.” There are various national emergency standards, but I don’t think they fall under those standards. “The equipment to prevent the spread of radioactive materials failed in June this year, but Tohoku Electric Power Co.: “This incident is different from the current system and signal.” The company also said that “there will be no impact on the resumption of operations.”