# codes

The TSUNAMI codes are available in the recently released SCALE 5.

## TSUNAMI-1D

The TSUNAMI-1D sequence computes the sensitivity of k_{eff} to cross-section data for
systems that can be modeled in 1-D. The XSDRNPM module is used to produce forward and adjoint neutron transport
solutions and the SAMS module is used to produce sensitivity coefficients. The BONAMIST and NITAWLST modules
are used to
produce the sensitivity of the resonance self-shielded multigroup cross-section data to input data for the
unresolved and resolved resonance regions, respectively.

Cross-section-covariance data are used in the calculation of the uncertainty in k_{eff} due
to uncertainties in the evaluated nuclear data.

The input for TSUNAMI-1D is similar to that used for the CSAS1X 1-D criticality safety analysis sequence of SCALE, with some additional input requirements.

TSUNAMI-1D produces a sensitivity data file in the TSUNAMI-A format. This data file contains the
sensitivity of k_{eff} to each reaction of each nuclide on a group-wise basis. Additionally,
the sensitivity of k_{eff} for each nuclide and each reaction of each mixture and material zone
are available on a group-wise basis. This data file is formatted for viewing
Javapeno and further analysis with TSUNAMI-IP.

## TSUNAMI-3D

The TSUNAMI-3D sequence computes the sensitivity of k_{eff} to cross-section data for
explict 3-D system models. The KENO V.a module is used to produce forward and adjoint neutron transport
solutions and the SAMS module is used to produce sensitivity coefficients. The BONAMIST and NITAWLST modules
are used to
produce the sensitivity of the resonance self-shielded multigroup cross-section data to input data for the
unresolved and resolved resonance regions, respectively.

Cross-section-covariance data are used in the calculation of the uncertainty in k_{eff} due
to uncertainties in the evaluated nuclear data.

The input for TSUNAMI-3D is similar to that used for the CSAS25 3-D criticality safety analysis sequence of SCALE, with some additional input requirements.

TSUNAMI-3D produces a sensitivity data file in the TSUNAMI-B format. This data file contains the
sensitivity of k_{eff} to each reaction of each nuclide on a group-wise basis. Additionally,
the sensitivity of k_{eff} for each nuclide and each reaction of each mixture and material zone
are available on a group-wise basis. This data file is formatted for viewing
Javapeno and further analysis with TSUNAMI-IP.

## TSUNAMI-IP

TSUNAMI-IP uses sensitivity data in the TSUNAMI-A or TSUNAMI-B format (as computed with TSUNAMI-1D and/or TSUNAMI-3D) to produce relational indices and other parameters that are used to assess the similarity of systems. These similarity measures are intended to determine the applicability of a benchmark experiment for the code validation of a design system.

Similarity can be asssessed on a "global" basis where all nuclides and reactions are considered, on a
reaction-specific basis, where only a single reaction (i.e. all fission in the systems) is considered, and
on a nuclide-reaction specific basis, where only a single reaction a single nuclide (i.e. n,alpha reaction
for ^{10}B) is considered.

Additional techniques are available in TSUNAMI-IP to assess a "penalty" or addition safety margin for systems where benchmark experiments cannot be identified to provide complete validation coverage.

## SAMS

SAMS is the Sensitivity Analysis Module for SCALE. SAMS processes data from forward and adjoint neutron
transport calculations with XSDRNPM or KENO V.a, the sensitivities of the resonance self-shielded cross-section
data to input data from BONAMIST and NITAWLST, and the sensitivities of derived input data to basic input data (i.e.
sensitivity Dancoff factors to input number densities) to produce the sensitivity of k_{eff} to basic
nuclear data. Sensitivity coefficients are produced for each energy group for each reaction of each nuclide
in each region of the system model. SAMS outputs these data to a standard text output file and formatted
sensitivity data files.

## BONAMIST

BONAMIST is a sensitivity version of BONAMI that produces resonance self-shielded cross-section data in the unresolved resonace region and the sensitivity of the group-wise data to the input data.

## NITAWLST

NITAWLST is a sensitivity version of NITAWL-II that produces resonance self-shielded cross-section data for the resolved resonance region and the sensitivity of the group-wise data to the input data.

## Javapeno

Javapeno (Java Plots Especially Nice Output) is a Java-based 2-D data plotting package. Javapeno supports several data file formats from SCALE codes and provides for simplified data visualization.

Oak Ridge National Laboratory
DOE-Oak Ridge
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