A 900 MW nuclear power station operates on a simple Rankine cycle (steam leaves the turbine as a saturated vapour) between 10 MPa and 10 kPa. The isentropic efficiency of the turbine is 85 %. If the power station runs continuously for a full year, how much Uranium fuel with an enrichment level of 5 % is required (the fission energy for Uranium235 is 6.73 × 109 kJ/kg; U-238 don’t fission). Hint: take enrichment level as mass of U-235 as a percentage of the total fuel mass (U-235 plus U238).