Associated Press: The nation’s worst nuclear power plant accident was unfolding on Pennsylvania’s Three Mile Island when an industry economist took the rostrum at a nearby business luncheon. It did not go well. Those in the standing-room-only crowd listened to economist Doug Biden’s thoughts about cheap, reliable nuclear power, but Biden could not calm their nerves or answer their pointed questions: Should they join the tens of thousands of people fleeing south-central Pennsylvania? Should they …