The assumption was made [52] that the unrecognized systematic uncertainty is not energy dependent. While this approximation was valid for **data** partially evaluated by the R-matrix theory 1 , where the normalization of experimental **data** relied on the unitarity of the formalism, the situation is different for other cross sections of neutroninduced reactions on heavy elements. In the latter case the approximation of USU as an energy independent quantity may be questionable, but it was introduced in the standards evaluation as a first approximation toward deriving more realistic uncertainty estimates.