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TEPCO Fukushima Daiichi Nuclear Power Plant Unit 3 Reactor Building (right) = in Okuma City, Fukushima Prefecture
On the 22nd, TEPCO left the two seismographs installed inside the reactor building of Unit 3 of the Fukushima Daiichi Nuclear Power Plant for more than half a year without repairing them, so it was midnight on the 13th of this month. It was revealed that seismic data for the 6 minor seismic intensity was not recorded.
Explained when the TEPCO party reported the impact of the earthquake at the meeting of the Nuclear Regulatory Authority. TEPCO did not mention the seismograph failure at all in the press conference and public materials after the earthquake, and had not announced it before that.
Akira Ono, CEO of Fukushima Daiichi Decommissioning Promotion Company, apologized to the study group: “I missed the opportunity to collect valuable data and I am reflecting on it.”
According to TEPCO, in March 2020, a seismograph was installed on the operating floor and the first floor on the upper floor of the Unit 3 reactor building. The seismograph on the first floor broke down in July, four months after its installation. , by immersion in the rain, and another broke in October of the same year for another cause.
A TEPCO spokeswoman told a press conference on the night of the 22nd: “We were planning to install a countermeasure. We needed to recover immediately after the breakdown.” The Unit 3 seismograph was “installed on a trial basis” to examine the building’s seismic resistance that caused the hydrogen explosion at the time of the accident.
At the Fukushima Daiichi Nuclear Power Plant, seismographs were installed on the basement floor of the reactor buildings of Units 1 to 6, but the equipment of Units 1 to 4 flooded by the tsunami is not working. (Kenta Onozawa)
