Typically grains that are not encased in a motor will burn like a road flare or not at all. It needs to be pressurized or not much will happen. I am sure the lawyer thinks rocket fuel = explosive. Thats just not the case.
A large enough nuke exploding directly over the USA would fry over 90% of all of the electronics in its line of site. Power, cars internet, phones, anything with a chip in it would die with absolutely no warning.