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May 15, 2021 05:30 PM EDT Tons of nuclear fuel in the wrecked basement of the plant has started their reaction again, and it s displaying no signs of stopping. (Photo : Getty Images) Chernobyl Nuclear Power Plant  In Ukraine, nuclear reactions are smoldering again in a basement of the wrecked Chernobyl nuclear power plant that is unreachable, according to news reports. Researchers keeping an eye on the plant - which exploded infamously in a 1986  lethal meltdown - have identified a stable spike in the number of neutrons in an underground room known as 305/2. The room is filled with heavy rubble, hiding a radioactive mush of graphite, zirconium, uranium, and sand that flows into the basement of the plant like lava, before solidifying into formations known as fuel-containing materials (FCMs). Rising neutron levels show that these FCMs are going through new fission reactions, as neutrons hit and split the nuclei of uranium atoms, producing energy.

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