1) The sonic booms are from this thing moving at only a few hundred feet overhead. Concorde was also designed with efficiency in mind: sonic booms lower efficie

1) The sonic booms are from this thing moving at only a few hundred feet overhead. Concorde was also designed with efficiency in mind: sonic booms lower efficiency. I doubt as SLAM was, since it doesn't "burn" fuel. The airframe isn't even area ruled. I doubt it would flatten a modern steel reinforced concrete building without falling on it, but it would certainly break windows and damage some structures. 2) Yes, it was relatively clean with no reactor damage when tested on a stand for 5 minutes. I suspect a few days or weeks of flying at tree level the reactor would physically decay. Breathing uranium/beryllium dust seems unpleasant to me. 3) It was definitely designed to fly at low level at Mach 3 for at least as long as it takes to drop all its bombs. What happens after that is kind of irrelevant, but whatever it is is guaranteed to make a mess. If you stop to think about it; this is inherently a high temperature device. Whatever they were using for electronics and servos would have had to deal with this. It would be interesting to know how some of these subsystems worked for certain.