In this particular kind of reactor a cluster of nine-ton uranium fuel rods are positioned lengthwise around a central control rod.The reaction begins with the slow removal of the control rod, which starts a controlled nuclear reaction and begins to heat the water in the reactor.This heat generates steam, which builds pressure inside the tank.As pressure builds, the steam looks for a place to escape.The only place this steam is able to escape is through the turbine.As it passes through the turbine on its way out of the tank,it turns the giant fan blades abd produces energy.