what would happen if a fully operational fusion reactor exploded in the possibly worst way?
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It can’t really explode. The fusion reaction requires extremely high temperatures to keep running. If the reactor is damaged, that temperature would immediately drop and that would stop the reaction. So some plasma might escape, some part of the reactor and/or the power station would melt and/or burn, but that’s it. There are also no long-lived radioactive isotopes in a fusion reactor, so no permanent environment damage. Also I should probably add that there are currently no working fusion reactors with positive energy output, so it’s all a bit theoretical at this point.
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