By James A. Lane, H. G. MacPherson, Frank Maslan
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Additional resources for Fluid Fuel Reactors
2-14 . This diameter FIG . 2-14 . Uranium isotope concentrations under equilibrium conditions vs . thorium concentration in a one-region reactor of 14-ft diameter . value has been chosen because it represents the diameter which gives minimum fuel costs, although it is realized that construction of the corresponding vessel may be beyond present technology . 08, and so this is the value used for poison fraction in the results given here . 03 . 7 Equilibrium results for one-region uranium-plutonium reactors .
Table 2-12 gives results [ :32] of some nuclear calculations for these one-region systems operating under equilibrium conditions . The reactor diameter was taken to be 15 ft ; the fuel-processing rate was such as to maintain a poison fraction of 7 1/6' in the reactor core . Fuel feed was considered to be obtained from an isotope-enrichment diffusion plant . 5% U 235 . 2-4 . 1 Two-region reactors . During the period following reactor startup, there is a buildup of fission-product poisons and higher isotopes with time, which results in varying nuclear characteristics .
In such studies, certain parameter values pertaining to nuclei concentrations and reaction probabilities are used ; for convenience some of these are listed in Section 2-2 . 2-1 . " In these studies the concentration of the various nuclei present can vary with time, but it is assumed that the condition of criticality will be maintained . The statics of chain reactions in aqueous-homogeneous reactors are of interest primarily in connection with the estimation of the inventory of fuel and fertile material, power density at the wall, the flux distribution inside the reactor, and the rate of production of fissionable isotopes .
Fluid Fuel Reactors by James A. Lane, H. G. MacPherson, Frank Maslan