Reference reactor design parameters

The reference reactor design parameters are reported in Table 2.2 and the following considerations can be drawn ... 

Though the subject of this work is the application of CANDLE bumup strategy to a small fast reactor, typical application of CANDLE to a large fast reactor with natural uranium feed is also presented as reference. The design parameters of large and small fast reactors are shown in Table 1. 

We shall be interested in estimating the fuel-cycle performance of this reactor during a steady-state cycle, in which fresh fuel has a enrichment of 3.2 w/o and spent fuel has a enrichment of around 1.0 w/o and also contains around 0.6 w/o fissile plutonium. The reference design condition used to evaluate effective neutron cross sections and other reactor physics parameters during irradiation is taken to be 2.7 w/o This value, slightly hi er than the arithmetic mean of the fissile content of fuel at the begiiming and end of irradiation, is intended to reflect the hl er cross section of fissile plutonium compared with... 

Qualitative comparison of some thermohydraulic characteristics of sodium and lead coolants is presented in [6.1] with BREST reactor design taken as a reference [6.2]. Results of optional assessments performed by the author [6.2] are in a good agreement with the data presented in [6.1]. In the analysis, the following parameters are assumed identical reactor power, average temperature in the circuit, cross section for coolant flow, coolant temperature rise in the reactor, primary circuit pressure drop and coolant volume. 

Lead-Cooled Fast Reactor (ELFR) and added a mid-size LFR (ie, the BREST-OD-300) as a new thrust and reference reactor system, while the SSTAR legacy system was retained as the reference small LFR. The typical design parameters of these GIF— LFR reference systems were previously summarized in Table 6.2 and are described further in the following subsections. 

The design equations for a chemical reactor contain several parameters that are functions of temperature. Equation (7.17) applies to a nonisothermal batch reactor and is exemplary of the physical property variations that can be important even for ideal reactors. Note that the word ideal has three uses in this chapter. In connection with reactors, ideal refers to the quality of mixing in the vessel. Ideal batch reactors and CSTRs have perfect internal mixing. Ideal PFRs are perfectly mixed in the radial direction and have no mixing in the axial direction. These ideal reactors may be nonisothermal and may have physical properties that vary with temperature, pressure, and composition. 

All of the preceding work was for simple, or one step, reactions. The more interesting case of multiple reactions has been studied by de Maria et al. (D15) and by Tichacek (T7). de Maria et al. considered the catalytic oxidation of naphthalene. They found that the consideration of the dispersion effects enabled them to obtain a better design. Tichacek considered the selectivity for several different types of reactions. Naturally, the results were rather complicated, and the statement of general conclusions is rather diflBcult. For small values of the reactor dispersion group, Dl/uL < 0.05, it was found that the fractional decrease in the maximum amount of intermediate formed is closely approximated by the value of Dl/uL itself. For other ranges of the parameters, we refer to the original work (T7). 

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