Comparative study of fuel burn-up and radioactive inventory for proliferation and proliferation resistant fuel lattices

A comparative study of fuel burn-up and radioactive inventory for the proliferation and proliferation resistant fuel lattices is carried out using the computer code WIMSD4. It is shown that by replacing the natural uranium metallic fuel and light water as coolant, such as used in the NRX/CIR, with the natural uranium oxide fuel and heavy water coolant, respectively, the core becomes proliferation resistant and environmental friendly as it produces about half the amount of 239Pu and presents about half the amount of activities associated with major actinidies as compared to the original NRX/CIR core. The infinite multiplication factors and the 239Pu produced in both fuel lattices are also compared.