March 14, 2002


March 14, 2002: GoldSim Used to Support Recommendation to the President Regarding Selection of Nation’s Radioactive Waste Repository

The Secretary of Energy, Spencer Abraham, has recently recommended to President Bush that the Yucca Mountain site be developed as the nation’s first long-term geologic repository for high-level radioactive waste. GoldSim software was used to develop the Total System Performance Assessment (TSPA) model that integrated all the subsystem models together and provided the final performance assessment results.

In his recommendation to the President, Secretary Abraham cited how computer simulations were used to forecast how the repository would perform far into the future and that his recommendation was based on sound science that the Yucca Mountain site is scientifically and technically suitable for the development of a repository. The TSPA model was subject to extensive review by the Nuclear Regulatory Commission, the Nuclear Waste Technical Review board, the US Geological Survey, and the International Atomic Energy Agency. Although technically suitable for review and approval by leading experts in radioactive waste disposal, the TSPA model developed using GoldSim was also made available in a simplified interactive format for the public to review and run themselves. (To read the complete text of Secretary Abraham’s recommendation, visit

The GoldSim Technology Group is dedicated to delivering software and services to help people understand complex systems and make better decisions. Our flagship GoldSim software package is based on technology developed over the past 10 years servicing such clients as the U.S. Department of Energy, Bechtel, Booz Allen & Hamilton, IT Corporation, Japan Nuclear Cycle Corporation, Phelps Dodge, Shell Global Solutions, Petrobras (Brazil), and Taisei Corporation (Japan). The GoldSim software package is a generalized simulator suitable for modeling any type of real-world system and has been used to solve problems related to strategic planning, portfolio analysis, risk assessment, program planning, supply chain management, environmental systems, and engineered systems. The GoldSim Technology Group is a division of Golder Associates, Inc., an international consulting firm with over 2,700 employees. For additional information, please visit the GoldSim website at:

“Yucca Mountain scientists have used this vast reservoir of information to develop computer simulations that … forecast how a repository will perform far into the future.” (Spencer Abraham, Secretary of Energy)


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