Uncertainties in the neutron-absorption cross sections of the fission products have only a marginal effect on decay-heat predictions for cooling times < 104 sec. Changes in decay heat at longer cooling times are dependent on the flux level and irradiation time, and no simple estimate can be made of the uncertainty in decay heat at these cooling times that arises from uncertainties in the cross-section data. Nevertheless, the conservative assumption is normally made that the desired accuracy of decay-heat calculations can be achieved with uncertainties in the cross sections of 10-30% for the important capture products over long decay times (leading up to 108 sec).