Total Uncertainty Analysis for PWR Assembly Based on the Statistical Sampling Method

Uncertainty Analysis for the Steady-Stated BEAVRS Benchmark Problem at ARO and ARI Situations

“…In order to propagate the nuclear-data uncertainties to the important responses of the reactor-physics calculations, the deterministic method and statistical sampling method (SSM) are widely applied. Because of the notable advantages, the SSM has been applied in our-home developed code NECP-UNICORN [2,3] to perform the uncertainty analysis for the reactor-physics calculations. Based on the "two-step" scheme, the uncertaintyanalysis capability for the reactor-physics calculations has been completed in NECP-UNICORN.…”

“…For the lattice calculations, the nuclear-data uncertainties are propagated to the few-group constants firstly; and then for the core simulations, the few-Copyright © 2017 by ASME group constants' uncertainties are propagated to the important responses, including the multiplication factor and power distributions. The verifications of NECP-UNICORN have been presented in our previous works [2,3], and the newly application and researches of NECP-UNICORN for the BEAVRS benchmark problem has been introduced in this paper. Uncertainty analysis has been applied to BEAVRS [4] at the Hot Zero Power (HZP) condition with the situations of All Rod In (ARI) and All Rod Out (ARO).…”