TSUNAMI-3D: CONTROL MODULE FOR THREE-DIMENSIONAL CROSS-SECTION SENSITIVITY AND UNCERTAINTY ANALYSIS FOR CRITICALITY

Abstract

TSUNAMI-3D (Tools for Sensitivity and Uncertainty Analysis Methodology Implementation in Three Dimensions) is a SCALE control module that facilitates the application of sensitivity and uncertainty analysis theory to criticality safety analysis. In MG mode, TSUNAMI-3D provides for resonance self-shielding of cross-section data, calculation of the implicit effects of resonance self shielding calculations, calculation of forward and adjoint Monte Carlo neutron transport solutions, and calculation of sensitivity coefficients. In CE mode, sensitivity coefficients are computed in a single forward Monte Carlo neutron transport calculation. In both MG and CE modes, the KENO V.a or KENO VI modules are used for transport solvers, and the SAMS module is used to compute and/or create edits of the sensitivity of the calculated value of keff to the nuclear data used in the calculation as a function of nuclide, reaction type, and energy. SAMS also computes the uncertainty in the calculated value of keff resulting from uncertainties in the basic nuclear data used in the calculation through energy-dependent cross-section-covariance matrices. In both MG and CE calculations, a sensitivity data file is produced for use in subsequent analysis.