Terrestrial Energy Submits A Foundational Safety Analysis To The NRC, Marking Another Step Toward Licensed Commercial Operation Of Its Integral Molten Salt Reactor Plant In The U.S.

The submission, a topical report defining the safety events the IMSR is designed to withstand, is a required step toward NRC issuance of a Safety Evaluation Report and future licensing applications for IMSR plant operations.

"This is an important milestone for the company. It reflects the depth and rigor of our safety case and the continued progress of our engagement with the Nuclear Regulatory Commission," said Simon Irish, CEO of Terrestrial Energy. "Establishing the basis for NRC acceptance of this safety analysis is a critical step toward licensing and operating IMSR plants in the U.S. market."

A topical report allows for NRC review of a safety-related topic and leads to a Safety Evaluation Report, a ruling that can be referenced in a future licensing application. This regulatory ruling avoids the need for revisiting of important topics of reactor safety, which increases efficiency of the licensing process, allowing a single review to apply to multiple nuclear power facilities, supporting fleet-scale deployment and reducing regulatory risk through standardization of key safety determinations.

This final submission reflects the culmination of multiple rounds of technical review with the NRC and represents the final stage of the topical report review process prior to issuance of a Safety Evaluation Report. The submission is indicative of the maturity of the IMSR design and demonstrates Terrestrial Energy's disciplined and systematic approach to regulatory engagement. It supports further regulatory analysis and the company's program to prepare license applications to operate IMSR plants in the United States.

This submission builds on prior regulatory milestones, including the NRC's issuance of a Safety Evaluation for the IMSR's Principal Design Criteria in September 2025. Together, these foundational elements establish critical components of the IMSR licensing basis and support continued advancement toward deployment including validation of key design attributes such as inherent reactivity control that delivers a reactor with inherently stable power dynamics.