To be fair, this investigation may be a wild goose chase. It appears the massive plans for Saudi/American co-operation have already been abandoned, although I’m not sure when the deal fell through. (That’s the key point that would determine whether there was corruption involved. It may have been abandoned some time ago, after both parties reconsidered, or it may not have been scuttled until investigators got wind of it.)
It had been reported in January that:
(1) the Saudis’ plan for sixteen nuclear plants had been scaled back to just two;
(2) to accomplish the scaled-back plan, they already had found partners in France and South Korea, thus obviating any need for assistance from the USA.