ne.gif (2791 bytes)     NE421 Introduction to Nuclear Criticality Safety

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In the previous lesson, we learned the buckling formula for a cylinder.  It is common practice to assume that a cylinder with a height/diameter ratio of 1.00 has the highest reactivity (lowest buckling).  

Use your calculus to show that based on the formula, the actual value for the most reactive H/D (for fixed volume) is 0.924.  (You may use a spreadsheet to show that this is optimum.)

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