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3. Problem 6.26: The original version of the Brookhaven Research Reactor consisted of a cube of graphite that contained a regular array of natural uranium rods, each of which was located in an air channel through the graphite. When the reactor was operated at a thermal power level of 22 MW, the average fuel temperature was approximately 300C and the maximum thermal flux was 5 x 1012 neutrons/cm2-sec. The average values of land Tt were 325 cm2 and 396 cm?, respectively, and ko = 1.0735. (a) Calculate the critical dimensions of the reactor; (b) What was the total amount of natural uranium in the reactor? [Ans.(a) a = 539.1 cm, and (b) 8.42 x 10 g.) 3. Problem 6.26: The original version of the Brookhaven Research Reactor consisted of a cube of graphite that contained a regular array of natural uranium rods, each of which was located in an air channel through the graphite. When the reactor was operated at a thermal power level of 22 MW, the average fuel temperature was approximately 300C and the maximum thermal flux was 5 x 1012 neutrons/cm2-sec. The average values of land Tt were 325 cm2 and 396 cm?, respectively, and ko = 1.0735. (a) Calculate the critical dimensions of the reactor; (b) What was the total amount of natural uranium in the reactor? [Ans.(a) a = 539.1 cm, and (b) 8.42 x 10 g.)