HW23-12 - calculated value above. 13. Discuss possible...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Nuclear Power Chap. 11 12. Over a period of one year what mass (in kg) of fission products is generated by a 1000 MWe power reactor? Solution: Assume the power plant has an electrical conversion efficiency 1] ~ 33% .Then the thermal energy generated in ~t = 365.35 d is Eth = (Pe/1])6.t = 1.107x 106 MWd. From page 148, we find 1 MWd of energy is released from the thermal fission of 1.05 g of 235U. The mass of fission products created almost equals the mass of 235U fissioned (the very small difference being the mass-equivalent of the fission energy re- leased). Thus, the mass of fission products created in one year of continuous operation is M(235U) = Eth (MWd) X 1.05 (gjMWd) = 1160 kg. Note: Table 11.4 indicates a typical 1000 MWe plant generates about 873 kg of fission products. However, a nuclear power plants typically has a capacity factor of about 75%. Thus, for continuous operation, the annual fission product generation would be about 873/0.75 = 1160 kg, a value in agreement with our
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: calculated value above. 13. Discuss possible environmental, technical and political problems associated with each of the disposal options listed in Table 11.6. Solution: This is best left as a classroom discussion topic. 14. A nuclear drive in a submarine delivers 25,000 shaft horse power at a cruising speed of 20 knots (1 knot = 1.15 miles/h). If the power plant has an efficiency of 25%, how much (in kg) of the 235U fuel is consumed on a 40,000 mile trip around the world? Solution: The voyage would take ~t = 40000 (mi)/(20 x 1.15 (mi/h)) = 1,739 h = 72.46 d. The thermal energy required for the voyage is Pshaft (HP) 11 x 745.7 (WjHP) x ~t Eth = From page 149 we find that for 1 MWd of fission energy, 1.24 g of 235U must be consumed. Thus the mass of 235U consumed on the voyage is M(235U) = Eth X 1.24 = 6.70 kg. July 24, 2002...
View Full Document

Ask a homework question - tutors are online