There were a total of 103 spent fuel rods in the reactor building. They contained of uranium in total. The reactor used very little fuel because its power was so low and it operated only a few hours a day. Some of the fuel rods were in the reactor for its entire 53 year operating time. The spent fuel does not need cooling because its decay heat power is so low. In addition to the spent fuel, 24 unused fuel rods were stored in the building. They contained of uranium in total.
