One-group xenon reactivity calculations

A study was initiated in the Pile Physics Unit to evaluate current methods for prediction of xenon behavior in light of newer operating conditions, and thus possibly improve the critical prediction accuracy. Particular areas considered included: (1) validation and limitations of the flux-squared weighting technique for homogenizing localized xenon effects, (ii) effect of elevated graphite temperature on xenon poisoning, (iii) xenon poisoning in the dry lattice, (iv) xenon-control rod interaction and mutual shadowing, and (v) effects of moderate to severe flux distortions. This document comprises the result of that study.