(T.A.E.C., Çekmece Nuclear Research Center, 1963) İnönü, E.; TAEK-ÇNAEM
A first-order expression for the average extrapolation length in bare thermal reactors was given previously on the basis, of a many-group calculation. C. Yalçın extended this calculation to second order and obtained a complicated correction term which does not seem easy to apply. His results are analyzed and simplified
here by considering the limit for continuous slowing down. It is shown that the second order correction is of the order of d/R, where is the first order average extrapolation length and R is a length which characterizes the size of the reactor.