1024LectureFile13

1024LectureFile13 - Nuclear Energy Fundamentally different...

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1 Nuclear Energy •Fundamentally different from and basically identical to fossil fuel electricity. –Huh? –Energy produced differently. –Used to boil water and turn turbines. •Fits readily into the existing energy infrastructure. –Results in unique problems.
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2 Boiler Furnace Smokestack Turbine Condenser Steamstack Reactor Vessel Containment Building Steam Generator
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3 The Source of Nuclear Energy •Helium: 2 protons, 2 neutrons, 2 electrons. –Sum of particle masses is 4.03303 amu. –Mass of one He atom is 4.00260 amu. •Where did the mass go? –Converted to binding energy to hold nucleus together. –E = mc 2 .
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4 http://hyperphysics.phy-astr.gsu.edu/ hbase/nucene/nucbin.html Binding Energy Curve
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5 Nuclear Fission •Break down heavy atoms. –Produces lighter, more stable atoms. –Excess neutrons. Proton Proton Proton Xe 140 Xe 140 Neutron U 235 U 236 Sr 94 Radiation
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6 Fission Reactors •Require a fissionable material as fuel. –Atoms split for energy and promote further splitting by giving off neutrons. •Uranium isotopes: Same element, different mass. –U 233 (92p, 141n) is fissionable: 0.0% –U 234 (92p, 142n) is not fissionable: 0.005% –U 235 (92p, 143n) is fissionable: 0.7% –U 238 (92p, 146n) is not fissionable: 99.3%
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7 Fissionable = Chain Reaction U 235 235 U
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8 Uranium Enrichment •Fission reactors require fuel of 30% U 235 .
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This note was uploaded on 08/30/2011 for the course ACIS 2116 taught by Professor Cmeasterwood during the Spring '08 term at Virginia Tech.

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1024LectureFile13 - Nuclear Energy Fundamentally different...

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