Experts have discovered significant missing concrete in the pedestal of Reactor No. 1 at the Fukushima Daiichi Nuclear Power Plant, raising concerns about its structural integrity and safety years after the catastrophic meltdown.
The Fukushima Daiichi Nuclear Power Plant, which experienced multiple meltdowns and hydrogen explosions in 2011, is still revealing unexpected findings more than a decade later. In May 2022, a remote-controlled robot was sent to investigate the area beneath Reactor No. 1 to assess melted nuclear fuel. To the shock of researchers, the robot found exposed rebar and significant portions of the pedestal, a structure made of reinforced concrete, missing near its base. This revelation sparked local unease regarding the reactor’s ability to withstand earthquakes and maintain stability.
Subsequent inspections indicated that the loss of concrete extends around the entirety of the pedestal, with an alarming 1.2-meter thickness missing up to one meter from the floor. Tokyo Electric Power Company (TEPCO) has attempted to reassure the public by stating that the reactor has additional lateral support and that the likelihood of catastrophic structural failure is low. However, fears remain regarding the potential for subsidence during an earthquake, which could create pathways for radioactive materials to escape.
The unexpected discovery has startled nuclear experts, as this type of structural degradation was previously not anticipated in studies of meltdown phenomena. In a January press conference, Shunsuke Yamanaka, Chairman of the Nuclear Regulation Authority, emphasized the need to fully unravel the mechanisms behind this damage. As the investigation continues, speculation about when and how the concrete disappeared is growing, underscoring the ongoing risks and challenges posed by the decommissioning process at Fukushima.
