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Fission products are generated randomly, i.e. you can't tell what nuclei will be formed as a result of particular fission process. However, "the distribution of the fragment masses formed in fission is dependent on the mass of the fissioning nucleus and the excitation energy at which the fission occurs. At low excitation energy, the fission of such ...

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The size of the core plays a large role in the feasibility of controlling a reactor through reflection. In small cores, the surface area is large relative to the volume, which, in the absence of a reflector, leads to high neutron leakage out of the core. As core size increases, the ratio of surface area to volume decreases, which, in an unreflected system, ...

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The term "Tokamak" refers to a design, not a size. The planed ITER reactor has the goal of 500 megawatts output. So it would take approximately 300,000,000 such reactors to produce the same power as the solar energy reaching the Earth. https://www.iter.org/factsfigures

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A meltdown is unlikely from either of those alone, but if there is damage to the control mechanisms - the control rods and the cooling systems - then it does become possible. Say it sinks due to a malfunction of, say, the ballast system. Then the crew would have time to insert the control rods in between the fuel rods in the reactor. This means that each ...

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The word meltdown isn't strictly defined and can cover a range of sins from the core melting into a blob and down into the ground (as happened at Chernobyl) through to fuel elements melting (as happened at Fukushima). At least two Russian submarines have experienced meltdowns, see here and here, though this was while they were floating not when they were ...

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