A publication of the Advanced Simulation & Computing Division, NA-121.2, NNSA Defense Programs
June 2008
NA-ASC-500-08—Issue 7
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ASC Contribution Featured in W80 QMU Analysis
A quantification of margins and uncertainties (QMU) study subject to both fully engulfing and directed-flux fire scenarios was performed under the Sandia ASC Verification and Validation program for the W80-0/1. This study employed the thermal analysis capabilities of Sandia’s SIERRA simulation software and the uncertainty quantification capabilities of Sandia’s DAKOTA software. Sandia’s Predictive Capability Maturity Model (PCMM) was used to assess the state of the physics-based computational models and the QMU analysis methods employed. The study also demonstrated new reaction rate chemistry models implemented in Sandia’s SIERRA Mechanics code and used experiment data acquired from W80-0/1 thermal tests in Sandia’s Radiant Heat Facility to assist with model validation.
The results of the study were presented at the annual Sandia Stockpile Review Conference (March 2008) and provided the first abnormal thermal QMU analysis for a stockpile system under both fully engulfing and directed-flux scenarios. The thermal analysis methods and QMU methods used in this study will serve as a template for future abnormal thermal QMU analyses for other stockpile systems.
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