The uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
What is nuclear fission?
Nuclear fission is the process of splitting the nucleus of heavier atoms to produce two or more atoms of lighter nucleus with the release of large amounts of energy.
In order to slow down the fission reactions in its nuclear reactor, neutron absorbers are introduced and the uranium-containing rods are removed from the nuclear reactor.
Therefore, the uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
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