User blog comment:RyanTheScourgeOfTheStorm25/Quirk Ideas?/@comment-37122965-20181007061724/@comment-37122965-20181016205452

Thank you, of course over the span of a few days ive solidiefied more ideas about Meltdown. Since the explosion is more of a Nuclear Explosion rather than Bakugo's chemical Explosions caused by igniting his nitroglycerin like sweat. For a short science lesson, Nuclear Explosions are caused by Nuclear Fission or fusion that are uncontained. For the apt use of this fusion would be the safe version of theu user's explosion as they are more contained and monitored. While fission would be the city block clearing explosions which are caused by a unfocused mind with to much power.

The best way to explain the cooldown of explosion is through a equation, like so.

[Blast volume] x [number of use] x 5[amount of cooldown for 1 use] = [Approximate Cooldown time]

Simple terms, take volume of explosion and multiply by five, and thats around the cooldown.

Also, what makes this quirk expessially different from Bakugo's explosive quirk, is the manner of the explosion. Rather than having the force breaking down a wall in the immediate blast zone like Bakugo, the user's explosion would partially chain a explosion if any matter happened to come in contact with the origin of the blast since fusion happens at the molecular level.