By Jamal T. Manassah
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Additional info for Alternative Energy Sources. Kuwait Foundation for the Advancement of Sciences
The driving pres sure may be calculated, for each channel, from: where H0 Fig p0 p£ Pch = = = ~ core nonboiling height, ft. core boiling height, ft. average density in the nonboiling height HQ average density in the boiling height H% average density in the chimney, of height Ech Expressions for the above average densities are usually complex, depending upon such things as the axial heat distribution, the void slip ratio (ratio of average steam velocity to water velocity), system pressures, inlet subcooling, and other factors.
The range of D2O concentration is from 70 to 5 mole percent over the life of the core. Because more excess neutrons are absorbed in the fertile material instead of poison rods, more conversion, higher fuel burnups, and lower fuel cycle costs are made possible. Better flux distribution is also claimed for this type reactor by reducing control rods and proper fuel loading, resulting in high specific powers, contributing further to increased burnup. An example of a heavy-water reactor power plant is the Pickering Generat ing Station.
Note that orificing shifts the maximum power density and the non boiling heights nearer the center of the core and has a flattening effect on the nonboiling heights and void fractions in general. NUCLEAR FISSION POWER PLANT 565 10 20 30 40 50 60 Core radius, in. 452 " T 100 m/ 90 / °2V/ y/- " r 80 %> 70 a> 2? 10 50 - ^ ^ - 40 1—2— 30 - i 10 FIG. III-2 . ,_ L 30 40 50 Core radius, in. (b) 1 60 1 Two-dimensional plots of (a) ratios of local to average power density, and (b) void frac tions for large boiling-water reactors.
Alternative Energy Sources. Kuwait Foundation for the Advancement of Sciences by Jamal T. Manassah