External Technical Review for Evaluation of System Level Modeling and Simulation Tools in Support of Savannah River Site Liquid Waste Process.

摘要

This report presents results of the External Technical Review (ETR) Team that evaluated the system-level modeling and simulation tools in support of Savannah River Site (SRS) liquid waste processing. A short description of the relevant experience of the team members and observers is given in Appendix A. The SRS Liquid Waste System (LWS) is a highly integrated operation that involves safely storing liquid waste in underground storage tanks; removing, treating, and dispositioning the Low-Activity Waste (LAW) fraction as in concrete vaults on-site; vitrifying the higher-activity waste; and storing the vitrified waste until permanent disposition at a Federal Repository. After waste removal and processing, the storage and processing facilities are cleaned and closed. In order to integrate all required activities, the Life-cycle Liquid Waste Disposition System Plan (LLWP) has been developed. It establishes a planning basis for processing the constituents of the liquid waste system to the end of the program mission. The LLWP is a qualitative evaluation based on modeling and simulation estimates. This review was chartered to focus on three primary areas: (1) Assess the assumption that the tools used for liquid waste process simulation yield reasonable estimates, (2) Evaluate if additional tools are needed to guide execution of individual processing steps, and (3) Evaluate methods to improve the rate at which system model predictions are performed. The foci of the charter were operational aspects of the modeling at SRS, i.e. reasonableness of estimates, prediction speed, tool integration, etc. Software Quality Assurance (SQA) was not a primary focus area of this ETR. However, during the course of the review, the team noted a number of relatively simple to execute improvements of the overall SRS modeling process that were related to SQA. Therefore, a discussion of SQA topics relevant to SRS is included as Appendix C.