"Death in 1 hour" Confirmed deadly level of radiation at the top of the Fukushima nuclear power plant building = South Korean coverage
From the containment vessel of Fukushima Daiichi Nuclear Power Plant, the level of radiation that killed humans was measured in one hour. This is far above the authorities' estimates. Following such an announcement following the damage to most of the filters that remove radioactive material from the treated water at the Fukushima nuclear power plant, the uncertainty of decommissioning work at the accident nuclear power plant has increased. Japan plans to release the treated water from the Fukushima nuclear power plant into the ocean two years later, raising concerns for neighboring countries.

According to the Asahi Shimbun on the 15th, Japan's Nuclear Regulatory Commission has announced that the surface of the lid at the top of the reactor containment vessel of Fukushima No. 1 Nuclear Power Plant Unit 2 is 1.2 Sv per hour (sievert), which exceeds the initially expected level, was confirmed the day before.

The lid is a circular reinforced concrete with a diameter of about 12 meters and a thickness of about 60 cm. It is called a "shield plug" and is installed in three layers to block the radiation emitted from the core.

It was analyzed that the radiation dose measured by the Nuclear Regulatory Commission from the inside of the first lid with a remote robot reaches several tens of Sv. Initially, the radiation dose inside the lid, estimated by the NRA, was well above 10 Sv/hour. The annual exposure limit for the general public is 1 millisievert, and a person can die if exposed to 10 sieverts of radiation for 1 hour.

The radiation dose is also fatal, but the weight of the lid, which reaches 150 tons, is also a cause of difficulty in decommissioning work. Of the triple lids, radioactive contaminants may remain between the remaining two lids, but TEPCO explained that there is no way to confirm it in the current state.

Even now, 10 years after the nuclear accident, work is still being done at the site, but far from completing the restoration, it has not even been possible to start decommissioning work. After disassembling the reactor in which the accident occurred and moving it to a safe place, the spent nuclear fuel and the melted nuclear fuel must be taken out and processed, but taking out the nuclear fuel, which is the core work itself, is a risk of exposure.

The Ministry of Economy, Trade and Industry and TEPCO are in a position to complete the decommissioning work within the next 20 to 30 years. However, it has become clear one after another that the decommissioning work will be hindered. The day before alone, it was confirmed that 24 out of 25 filters that prevent radioactive materials from being discharged into the air from the tank that stores the treated water from the Fukushima nuclear power plant were damaged. TEPCO, the management body, admitted that radioactive materials had leaked into the air.

According to the Japan Center for Economic Research, the cost of recovering from the nuclear accident is estimated to exceed 80 trillion yen in the long run. This is almost twice the size of the Korean government's annual budget of about 500 trillion won.

Meanwhile, the Japanese government plans to release the treated water from the Fukushima nuclear power plant into the sea from 2023. The Japanese government is in the position that it is safe because the radioactive substances contained in the treated water are filtered and released, but a fatal radiation dose was detected from the containment vessel and the filter was left unattended. It has become clear, and concerns for neighboring countries, including South Korea, are increasing.
2021/09/22 21:09 KST