7,9,11 and 13

7. Repeat the previous problem for gas centrifuge enrichment. Assume that the Urenco TC21 centrifuge is used: 7 Material: Carbon-fiber composite Diameter: 20cm Length: 5m Speed: 770m/s Temperature: 333K 8. An enrichment plant receives 32 tonnes per day of natural uranium and produces 26 tonnes per day of tails having an assay of 0.25wt%. What is the enrichment of the product? 9. A customer orders 100,000kg of uranium enriched to 5%U235. (a) If the tails assay is 0.3%, how many kilograms of natural uranium are required to fill the order? (b) How many SWUs are needed for the enrichment? 10. Compute the value function for each of the following: (a) Natural uranium; (b) Uranium enriched to 3\% U-235; (c) Uranium depleted to 0.25% U-235. 11. We wish to produce 1kg per hour of 3% enriched product. Assuming a tails assay of 0.25%, compute the following: (a) Feed flow rate; (b) Tails flow rate; (c) SWU required. 12. Estimate the quantity of natural uranium and the SWU required to produce 1 kg of HEU (90\%) for each of the following tails compositions: (a) 0.25%235U (b) 0.50%235U (c) 0.69%235U. 13. A 1,300-MWe nuclear power station operates at 33% efficiency. It consumes annually 25 tonnes of uranium enriched to 3.75% U-235. Compute (a) the mass of natural uranium and (b) the separative work required to fuel the reactor for a year