Evaluation of technological uncertainties using the sensitivity to nuclear data

Abstract

The paper presents an assessment of the effect caused by technological uncertainties on k_eff using the example of the test problem for a MET1000 fast sodium reactor with metal fuel. It is proposed to perform this assessment using nuclear sensitivity factors by random sampling or direct perturbation without requiring multiple calculations. The TSUNAMI-3D module of the SCALE program was used to analyze the sensitivity to nuclear data uncertainty. The obtained constant and technological uncertainties based on ENDF/B VII.1 equal 1.15 and 0.6%, respectively. The result was verified using direct perturbation. It is shown that a significant proportion of the technological uncertainties can be determined within the framework of the proposed evaluation method.