Question: A thermal-neutron reactor is charged every year with enriched uranium containing 1.6 t of 235 U. When the spent fuel is removed, it contains 400

A thermal-neutron reactor is charged every year with enriched uranium containing 1.6 t of ²³⁵U. When the spent fuel is removed, it contains 400 kg of ²³⁵U and 560 kg of ²³⁹Pu. Assuming a conversion ratio CR = 0.6, what fraction of the reactor power was generated by fission of ²³⁹Pu? (Ignore radiative capture of thermal neutrons in both ²³⁵U and ²³⁹Pu, ignore production and fission of any other actinides, and assume that the energy releases in ²³⁵U and ²³⁹Pu fission are identical.)

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