At a typical nuclear power plant, refueling occurs about every 18 months. Assuming that a plant has

Question:

At a typical nuclear power plant, refueling occurs about every 18 months. Assuming that a plant has operated continuously since the last refueling and produces 1.2 GW of electric power at an efficiency of , how much less massive are the fuel rods at the end of the 18 months than at the start? (Assume 30-day months.)