Development of the 4S and related technologies (8). An application of physics benchmark experiment results to safety analyses of small fast reactors. An analysis of delayed neutron reaction benchmark results using nuclear design methodology

Various benchmark cores were analyzed with the 4S nuclear design methodology (in combination of transport calculation methods and JENDL-3.3 base libraries), in order to enhance the data base for evaluation of uncertainties of nuclear characteristics. Delayed neutron fraction analyses were made for support of the safety analyses of the 4S core. Using critical benchmark data obtained in leakage dominant small ZPR and ZPPR cores, low enriched uranium fast spectra cores have been analyzed using JENDL-3.3 and ENDF/B-VII.0 libraries to understand the results obtained from the recent reflector control physics benchmark FCA XXIII cores. The evaluation showed delayed neutron fractions and criticality were reproduced in good agreement with the 4S nuclear design methodology. (author)