Question: Problems 3 and 4 are based on the fast reactor fuel composed of a mixture of enriched Uranium and Pu-239. The atomic densities of

Problems 3 and 4 are based on the fast reactor fuel composed

Problems 3 and 4 are based on the fast reactor fuel composed of a mixture of enriched Uranium and Pu-239. The atomic densities of 235 U, 238 U, and 239Pu are 7.68 1021, 3.06 1022, and 9.57 1021 cm 3, respectively. PROBLEM 3. (15 points) Determine the power density within the fuel when it is exposed to a fast neutron flux of 1.0 1015 n/cm.s. Give your answers in W/cm. Assume that energy release per fission for all isotopes is 190 MeV. What percentage of the power density is due to Pu-239? PROBLEM 4. (10 points) Compare production and consumption rates of Pu-239 when this fuel is exposed to a fast neutron flux of 1.0 10 15 n/cm.s, finding the fraction of produced Pu- 239 isotopes per consumption. Consider that 239Pu is an immediate decay product of 239U pro- duced during neutron capture by U-238. Neglect the radioactive decay of Pu-239. (10 points)

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