Integral Molten Salt Reactor (IMSR)
Project Overview
The U.S. Nuclear Regulatory Commission (NRC) is currenlty engaged in pre-application activities with Terrestrial Energy USA Inc (TEUSA) starting in October 2019 regarding their Integral Molten Salt Reactor (IMSR) design.
For more information, please see the TEUSA pre-application documents (NRC Docket 99902076).
To subscribe to the Terrestrial Integral Molten Salt Reactor (IMSR) email service, select Terrestrial IMSR from the Advanced Reactors list after entering your email into the GovDelivery system.
Pre-Application Activities
| Product | Type | Reference | Status |
| Core-Unit Definition – Applicable Structures, Systems and Components | White Paper | ML20097B836 (Revision 0) ML22138A340 (Revision 1) | Feedback Provided ML20121A139 (Revision 0) Feedback Provided ML22278B100 (Revision 1) |
| Interfaces Between the IMSR® Core-unit and Reactor Auxiliary Building Structures and Systems | White Paper | ML20157A195 ML21029A222 | Feedback Provided ML20191A198, ML21061A071 |
| Principal Design Criteria for IMSR® Structures, Systems and Components | White Paper | ML20178A442 ML21025A030 | Feedback Provided ML20304A561, ML20304A610 |
| Examination of Regulatory Requirements to Determine Exemption Needs for the IMSR® Core-Unit | White Paper | ML20262H163 | Feedback Provided ML20302A488 |
| Postulated Initiating Events | White Paper | ML20318A169, ML20318A171 ML21357A013 ML21357A011 | Feedback Provided ML22140A276 |
| Structures, Systems, and Components Classification Methodology | White Paper | ML21323A013 ML21323A014 | Feedback Provided ML22033A370 ML22033A458 |
| Standard Design Approval Application Content | White Paper | ML21014A352 | Feedback Provided ML21081A226 ML21081A287 |
| Principal Design Criteria for IMSR® Structures, Systems, and Components | Topical Report | ML23025A066 (Revision 1) ML24053A168 (Revision 2) ML24204A092 (Revision 3) | Approved for Use ML25322A302 |
| Uncertainty Quantification Methodology for Calculation of IMSR® Off-Gas Source Term | Technical Report | ML23228A045 ML24053A173(Revision 2) | Feedback Provided ML23286A100 |
| Modeling and Simulation Activities related to Source Term for IMSR® Design Basis Accidents | White Paper | ML24117A109 | Feedback Provided ML24226A375 |
| Postulated Initiating Events for the IMSR 400 | Topical Report | ML25006A141 (Revision A) ML25274A145 (Revision B) ML26092A409 (Revision C) | Under Review |
Contacts
| Contacts for the Integral Molten Salt Reactor (IMSR) Pre-Application Review | |
|---|---|
| Lead Project Manager | Kevin Roche |
| Contact a Public Affairs Officer | |
Page Last Reviewed/Updated Monday, June 01, 2026
Page Last Reviewed/Updated Monday, June 01, 2026