EPRI Yucca Mountain Total System Performance Assessment Code (IMARC) Version 10

Since 1989, EPRI has been conducting independent assessments of the proposed deep geologic repository for the disposal of spent nuclear fuel (SNF) and high level radioactive waste (HLW) at Yucca Mountain, Nevada. EPRI pioneered application of the total system performance assessment (TSPA) approach for evaluating performance of geologic repository systems on a probabilistic basis. Along the way, EPRI developed the Integrated Multiple Assumptions and Release Code (IMARC) as its primary analytical tool for TSPA-based evaluations. Over this two-decade time period, IMARC has been periodically revised to reflect the evolving state of knowledge and the changing programmatic and regulatory environment.