My understanding is that the Uranium itself wasn't on fire, but a fire broke out at the facility and it was quickly put out almost as fast as it started. Still unacceptable, and most definitely suspicious. But not a disaster thankfully.

Besides, Oakridge keeps all their Nuclear stuff 500+ feet under the ground in a complex series of bunkers for safety. So there's little to no chance of any kind of widespread disaster from Oakridge. It's one of the most complex, and therefore safest, nuclear facilities on the planet.