If it is a tokamak as is likely, the chamber will be under vacuum, unlike a pressurised water reactor which has a pressure vessel at high pressure. However a fully engineered design does not exist yet so what the plant to absorb the reaction's heat will look like is unknown.
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A fusion reactor operates by fusing atomic nuclei at high temperatures and pressures. The reaction self-regulates such that if any instability occurs, the reaction will cool down and cease. This passive safety feature significantly reduces the risk of an explosion compared to traditional fission reactors.
The Sun is an immense fusion reactor in space. It generates energy through nuclear fusion reactions at its core, converting hydrogen into helium and releasing vast amounts of energy in the process.
The expectation is that fusion reactors will provide large amounts of energy, and that they will be relatively environmentally-friendly.
A fusion reactor generates energy by fusing atomic nuclei together, replicating the process that powers the sun, while a nuclear reactor generates energy through nuclear fission, which involves splitting atomic nuclei. Fusion reactors have the potential for greater energy output, produce less radioactive waste, and have lower risk of meltdown compared to nuclear reactors. However, fusion reactors are still in the experimental stage and face challenges in achieving sustained fusion reactions at a commercial scale.
With current technology we cannot produce a sustained fusion reaction and the experimental fusion reactors we do have use more energy than they generate.
Because of quantum mechanics, anything is possible. However, it is very, very, VERY unlikely that any planet will explode.