[quote=@Krayzikk]
I never said anything about an explosion. I'm pointing out the effect of a radiation leak from a reactor that is, by definition, leagues above any fusion reactor we have created today.

Fusion reactor we have today work by heating gasses to their fusion point, and as soon as we stop heating them, they repel each other again. Thus the reaction stops. Any reactor that powers something, and as such creates a net positive energy output, will need to be self sustaining. In other words, when the heating process stops, it will not instantly stop the reaction.

The reaction will continue after reactor breach. Eventually it will collapse, yes, but it is not instant. And until it does you will have an unconfined reaction occurring. Which will both put off a ton of radiation and, yes, have explosive potential. A fusion bomb is [i]by definition[/i] an uncontained fusion reaction.

Fusion reactors are only safe by government standards because none of the ones we have created, [i]ever[/i], are on anywhere near the level of what would be powering Gren.
[/quote]

I think a rp based on a show where they somehow have flying ships and mecha, it's not too hard to believe that someone might have a mini reactor implanted in them (Gren could literally just say he has an artificial limb and I doubt the people checking, if at all, at a metal detector, would try say nope you can't go in.) 

And here's the thing, RWBY doesn't follow rl logic strictly. I mean flying military ships, semblances? Mecha?

keyword is "None of the ones we created". Pretty sure RWBY doesn't follow the tech tree of reality. They have plenty we don't have. 

How much energy Gren would need is never really specified anyway so there's that. I doubt he needs the full on power a city might need.

Whether the RWBY world is capable of creating a small scale fusion reactor, I will have to admit, is a bit of a stretch.