Word Count : 302

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We are asked to find the mass of (^{235}\mathrm{U}) in a reactor operating at 1000 MW using thermal neutrons. Let’s solve this step by step. Given: * Reactor power (P = 1000 , \mathrm{MW} = 1 \times 10^9 , \mathrm{W}) * Thermal neutron flux (\phi = 10^{16} , \mathrm{m^{-2} s^{-1}}) * Fission cross-section (\sigma_f = 580 , \mathrm{b} = 580 \times 10^{-28} , \mathrm{m^2}) * Energy released per fission (E_f \approx 200 , \mathrm{MeV} = ______ ________ _____ ______ __________ ___.
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