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Unformatted text preview: 1 ME 417 Design of Alternative Energy Systems Nuclear Energy Calculations Conversion of mass into energy E = mc 2 Fission Fission of U235 produces, on the average, 2.3 neutrons. Fission rate (fission per day) Fission Rate = Power [Energy Recovered per Fission] FR = P/E R in fissions/time For each fission, we consume one atom of the fuel, so the burnup rate becomes Burnup Rate = [Fission Rate] x [Molecular Weight of Fuel] [Avaogrados Number] BR = FR MW f /N A = P MW f /(N A E R ) in mass/time Consumption rate (using the definition of the cross sections Consumption Rate = {[Absorption Cross Section]/[Fission Cross Section]} x [Burnup Rate] Fuel Element Temperatures ( 29 coolant tot 2 f 2 2 f f T + HR R g 2 1 r R 4k g = (r) T + & & Inside surface temperature of the cladding (its hottest point) is given by + + = clad coolant clad gas clad coolant clad , i R h 1 k 2 ) R / R ln( g T T & Departure form nucleate boiling or burnout....
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This note was uploaded on 07/25/2008 for the course ME 417 taught by Professor Somerton during the Spring '07 term at Michigan State University.
 Spring '07
 SOMERTON

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