what would happen if a fully operational fusion reactor exploded in the possibly worst way?
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The current biggest fusion reactors have enough fuel in its core to generate about a gigajoule of energy. It all that was released at once it would have roughly the energy of 200 kg of TNT. Normally it discharges over almost two minutes. The entire fusion reaction takes place in about 15 minutes normally. So having it all release at once is unrealistic. But even if that were to happen the resulting explosion could not get larger then a medium sized bomb.
As for radioactivity a fusion reactor does not really generate the same kind of long lived radioactive minerals that a fission reactor can make. There may be some radioactive materials being created but not the same type and not in nearly the same quantities.
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