Comparing geologic repository assessment tools (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories engineers Emily Stein, left, and Paul Mariner, discuss recent results from their Geologic Disposal Safety Assessment software framework for the international collaboration. The software modeled the spread of radioactive materials in a hypothetical spent nuclear fuel repository over 1 million years. Credit Rebecca Gustaf/Sandia National Laboratories Usage Restrictions With credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.