Lecture 0319.pptx - Energy and Climate \u2013 Vision for the Future Michael B McElroy [email protected] Key Points The energy released by nuclear

Lecture 0319.pptx - Energy and Climate – Vision for the...

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Energy and Climate – Vision for the Future Michael B. McElroy [email protected] March 19, 2017
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Key Points The energy released by nuclear processes in civilian reactor involves fission of uranium; Uranium must be enriched in 235 U to facilitate this process; Production of a nuclear bomb requires a higher level of enrichment; Background to current unease as to the future of nuclear energy; Economics of nuclear power.
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In burning methane (CH4), the primary component of natural gas, the net reaction may be written as The basic equivalence of mass and energy expressed through the equation
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The protons and neutrons in a nucleus must be bound together. When they are bound together, the combined system must transition to a lower energy state. Assume that the binding energy is given by B. Since energy and mass are related according to E=Mc 2 , it follows that the binding process is associated with a reduction in mass equal to B/c 2 .
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If the mass of the nucleus is denoted by M with the masses of the protons and neutrons given by m p and m n respectively, and if we assume that the nucleus includes n p protons and n n neutrons, and the binding energy is given by B, it follows that Nuclear Fission c = 299,792,458 m/s 3.0 x10 8 m/s
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Energy Produced per Reaction Mass balance per 235 U in the reaction: Left Hand Side: 1.67 49× 10 -27 + 3.9030 × 10 -25 = 3.9198 × 10 -25 (kg) Right Hand Side: 2.3899 × 10 -25 + 1.4765 × 10 -25 + 5.0248 × 10 -27 = 3.9167 × 10 -25 (kg) Δm=3.0888 × 10 -28 (kg) Energy = Δm×C 2 = (3.0888 × 10 -28 ) × (3.0 x10 8 ) 2 = 2.78 ×10 -11 J = 173 MeV=2.63 ×10 -14 BTU
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