System-code Uncertainty Evaluation (SUE) is a simple and user-friendly software program to perform uncertainty quantification (UQ) analysis with system thermal-hydraulic (STH) and computational fluid dynamics (CFD) codes. The current version of the program is specifically intended for three STH codes and one CFD code:

    - SPECTRA,
    - RELAP5,
    - MELCOR,
    - FLUENT (CFD code).

SUE performs the following tasks:

1. determines the number of runs N required, based on the UQ methodology selected and uncertain parameters specified by the user;
2. prepares input files for all N runs;
3. executes the applied code N times;
4. performs post processing, including calculation of minimum/maximum values of selected parameters, mean value and standard deviation, Pearson’s correlation coefficients.

The steps 1 through 3 may be performed with any STH or CFD code. There is no need to manipulate in any way with the STH/CFD codes that are being used. SUE takes care of everything; prepares all input files and starts all calculations. Therefore the use of SUE is very simple and user-friendly.

Post-processing (step 4) is in the current version of SUE only available for SPECTRA, RELAP5, MELCOR, and FLUENT, but the program can be easily extended to other STH or CFD codes as well