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I'm studing the reactor theory and I've understood how make critical a reactor with simple shapes (spherical,cylindrical,etc.) equating the material and the geometrical buckling.

But it's possible, in a simple way, to understand how a real reactor with a definite amount of nuclear fuel is sized critical?For example, is the single fuel rod critical?Or the total amount of the rods make the core critical?

i'm sorry to be so vague, but I need to make an approximate design calculation of a PWR's core size.

Thank you.