937 trillion molecules of Fe solid (1 trillion = 1,000,000,000,000 = 10-12)

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.