The fuel supply, even if it burns won't explode unless it's heated to the point of conbustion and is in a sealed container. At 150+ feet, any explosion should be shielded from the complex by the maintenance dome and the distance. No air and shockwaves are minimal. No air and the flames are contained nicely.<br/><br/>Just like a car gas tank, if the gas cap is taken off, a car will not, cannot explode. It may burn, but that's different than going "Boom!"<br/><br/>Of course, if the fuel is two stage, they may not even burn unless they are mixed properly and that might not occur outside of the engine itself. I remember the fuel for the ships in the PERN series; alone, it'll make a great weed killer, but unless it's mixed with the other elements, it won't burn.<br/><br/>I would be more concerned with the reactor. If it goes critical and explodes, 10KM won't be enough space to keep the facility safe.<br/><br/>On the bright side, no anti-matter to accidently mix with the wall and blow the whole planet to kingdom come. ;)