Reconsideration of the Theoretical Supplementation of Decay Data in Fission Product Decay Heat Summation Calculations

Abstract

In the early stage of the development of the fission product (FP) decay data library for decay-heat summation calculations a serious disagreement between calculations and sample-irradiation measurements was experienced world wide. This problem was essentially circumvented by introduction of the nuclear model calculations. By applying the recent results using the total absorption gamma-ray spectrometer to the decay heat calculations we found that TAGS results seem to be free from the pandemonium problem and, in this respect, it provides a solid basis of the summation calculations without the supplementation of the nuclear model calculations. Among the typical FP nuclides which deserve the future TAGS experiment there are 98 Nb, 100 Nb, 105 Mo and 102 Tc and others from the present survey.

Pandemonium Problem in Fission-Product Decay Heat Calculations Revisited

“…In Ref. 20), well-prepared and cautious TAGS experiments proved to overcome the long-standing and persistent pandemonium problem. This conclusion was drawn on the basis of the old TAGS data by the Idaho group, but the nuclides measured there do not always cover the important FP nuclides from the viewpoint of the summation calculation.…”

“…Comparison of the E and E among major decay data files for 145 La (all in keV) Converted in Ref 2019) (now Idaho National Laboratory).…”