# introduction

## TSUNAMI

**T**ools for **S**ensitivity and **UN**certainty **M**ethodology **I**mplementation
(**TSUNAMI**) provide for advanced nuclear criticality safety and reactor physics analyses.
TSUNAMI utilizes first-order-linear perturbation theory to produce the sensitivities of a computed
k_{eff} value to constituent cross-section data. The energy-dependent sensitivity data for
each reaction of each nuclide in a system model can be quickly computed using TSUNAMI's
1-D and 3-D
analysis tools. These sensitivity data can be coupled with cross-section-covariance data to produce
an uncertainty in k_{eff} due to uncertainties in the evaluated nuclear data.

TSUNAMI also allows for the comparison of systems based on sensitivity and uncertainty data. The TSUNAMI-IP code produces relational integral indices that determine the degree of similarity between two systems. The intent of this similarity assessment is the determination of the applicability of a benchmark system for the code validation of a design system.

Further TSUNAMI techniques can determine an additional margin to subcriticality for design systems where applicable benchmarks cannot be found to fully validate the design codes.

Oak Ridge National Laboratory
DOE-Oak Ridge
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