CROSS SECTION AND METHOD UNCERTAINTIES: THE APPLICATION OFnSENSITIVITY ANALYSIS TO STUDY THEIR RELATIONSHIP IN RADIATION TRANSPORT BENCHMARK PROBLEMS

摘要

Sensitivity analysis is applied to the study of an air transport benchmark calculation to quantify and distinguish between cross-section and method uncertainties. The boundary detector response was converged with respect to spatial and angular mesh size, P. expansion of the scattering kernel, and the number and location of energy grid boundaries. The uncertainty in the detector response due to uncertainties in nuclear data is 17.0％ (one standard deviation, not including uncertainties in energy and angular distribution) based upon the ENDF/B-IV "error files" including correlations in energy and reaction type. Differences of ap¬proximately 6% can be attributed exclusively to differences in processing multigroup transfer matrices. Formal documentation of the PUFF computer program for the generation of multigroup covariance matrices is presented.