a) Calculate ŋ and f for a reactor that utilizes uranium enriched 30% in U-235 (mass fraction 235U = 0.30), if the uranium is dissolved in heavy water at a concentration of 0.25 g/g heavy water. Use these values to provide an estimate for K... Please state the assumptions you make in the estimate of K. and provide a source or citation for any cross section values that you might use. Compare calculated ŋ to the n for natural uranium (n = 1.3). What is the significance of the difference? b) The following Table provides K. values for a theoretical homogeneous natural uranium-light water reactor assembly. (Nm/Nu is the molar ratio of moderator to fuel). What can one say about the proposed reactor assembly? Why? For U-235 (0.712%; n = 1.33) Nm/Nu f 50.000 0.192 0.928 Koo 0.236 100.000 0.106 0.949 0.134 200.000 0.056 0.964 0.072 300.000 0.038 0.971 0.049 400.000 0.029 0.975 0.037 500.000 0.023 0.977 0.030 600.000 0.019 0.979 0.025 700.000 0.017 0.981 0.022 800.000 0.015 0.982 0.019