Most of the nuclear reactors in Minecraft could explode when poorly managed.So should Mekanism Fusion.
“Art is explosion!”--Deidara，NARUTO

Will add a config option for that

OK.Better to do it for both 1.12 and 1.16 versions.

Done for 1.12.2 version

Thanks.But,the explosion is only one TNT size?It's too small for a nuclear stuff.

Fusion reactors are not exploading IRL.
Also some big booms can bring us to additional issues.

But most of the fusion devices do explode and do it really big.(e.g Big Ivan)