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Verification and Validation

Based on the functional and operational requirements established by designers, analysts and code developers for greater fidelity of codes and models, this subprogram establishes a technically rigorous foundation for the credibility of code results. This subprogram interfaces with the Integrated Codes Subprogram to obtain regular, official code releases from the code projects. Verification activities assess code precision in implementing numerical approximations and assess the accuracy of these numerical approximations. Validation activities aid in the understanding and assessment of a model's accuracy by comparing model predictions with experimental data. Quantification methodologies provide measures of the uncertainties associated with the simulations. Sound software quality engineering practices are used to ensure robust, efficient, and well documented software releases of the ASC codes.

Areas include:

  • V&V Methods: methods, measures, and standards necessary to assess the credibility of the ASC codes and models, quantify confidence in ASC calculation results, and measure the progress in the ASC predictive capabilities. This product will be the entry point for advanced technologies in support of establishing credibility in code predictions.
  • Primary V&V Assessments: science-based assessments of the predictive capability and uncertainties in the performance code's primary physics and related models to support the needs of the SSP. This product evaluates the models and numerical algorithms pertaining to primary applications. This product focuses on establishing credibility in primary simulation capabilities.
  • Secondary V&V Assessments: delivers science-based assessments of predictive capability and uncertainties in secondary performance codes and related models to support the needs of SSP. This product includes the evaluation of secondary simulations within its functional and operational requirements. Innovative mathematical techniques and analysis tools (developed by the V&V Methods above) are utilized to produce assessments at the system, subsystem, and component levels, and they measure progress in reducing phenomenology in the weapon simulation codes.
  • Engineering V&V Assessments: systematic assessments of predictive capability and uncertainties in engineering codes and related models to support the needs of SSP. This product focuses on measuring the level of confidence in these code results that are used to investigate specific physical phenomena and generate fundamental physical data. The scope of this product includes planning and experiment design, assessments of software quality, verification assessments, validation assessments (integral and hierarchical), UQ, predictive accuracy estimation, and documentation.
  • Specialized V&V Assessments: systematic assessments of predictive capability and uncertainties in specialized and safety codes and related models to support the needs of SSP. This product focuses on measuring the level of confidence in the codes results that are used to investigate specific physical phenomena and generate fundamental physical data. The scope of this product includes planning and experiment design, SQA, verification assessments, UQ, validation assessments (integral and hierarchical), predictive accuracy estimation, and documentation.
  • Data Validation and Archiving: provides traceable and reproducible work products and processes for certification (short and long term). The scope of this product includes integral validation of nuclear data that provide input physical data for various weapon relevant materials; additionally, this product includes work product and data archiving and simulation pedigree tracking.

 

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