Consistent Data Assimilation of Structural Isotopes: 23Na and 56Fe

Palmiotti, Giuseppe

Idaho National Laboratory

关键词: Modifications;    Sodium;    Isotopes;    Neutrons;    Exciton Model;   

DOI  :  10.2172/1004230
RP-ID  :  INL/EXT-10-20094
RP-ID  :  DE-AC07-05ID14517
RP-ID  :  1004230

美国|英语

来源: UNT Digital Library

【 摘 要 】

A new approach is proposed, the consistent data assimilation, that allows to link the integral data experiment results to basic nuclear parameters employed by evaluators to generate ENDF/B point energy files in order to improve them. Practical examples are provided for the structural materials 23Na and 56Fe. The sodium neutron propagation experiments, EURACOS and JANUS-8, are used to improve via modifications of 23Na nuclear parameters (like scattering radius, resonance parameters, Optical model parameters, Statistical Hauser-Feshbach model parameters, and Preequilibrium Exciton model parameters) the agreement of calculation versus experiments for a series of measured reaction rate detectors slopes. For the 56Fe case the EURACOS and ZPR3 assembly 54 are used. Results have shown inconsistencies in the set of nuclear parameters used so that further investigation is needed. Future work involves comparison of results against a more traditional multigroup adjustments, and extension to other isotope of interest in the reactor community.