[quote=@Krayzikk]
I know exactly what he's thinking of. I did the research using them to power mecha in another RPG setting.

Breaching a reactor potent enough to power a cyborg, and his weapon systems, would be catastrophic for anyone anywhere near him. 
[/quote]

I still have not found anything that suggests a nuclear fusion failure would result in an explosion from government nuclear agency websites.


http://ec.europa.eu/research/energy/euratom/index_en.cfm?pg=fusion&section=safety-and-environment

And as prince of seraphs pointed out it's mainly a leaking issue of tritium that you need to worry about, evidenced here.

 http://www.nrc.gov/reactors/operating/ops-experience/grndwtr-contam-tritium.html

So everyone would be getting radiation poisoning. And as the EU website stated, an event of a breach isn't of concern to the local community, just the people extremely close to the reactor itself. It probably wouldn't be a concern to people near it unless they are there for a while. 

As long as there is proper containment, which is another story.