Question: A bare square cylindrical reactor 70 cm in height is controlled by one control rod located on the axis that is worth 6.5% when fully

A bare square cylindrical reactor 70 cm in height is controlled by one control rod located on the axis that is worth 6.5% when fully inserted. If the reactor is critical when the rod is out, how far must the rod be inserted to introduce 1% (negative) reactivity

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