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Integral Molten Salt Reactor (IMSR)

Artist rendering of Terrestrials 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)
 

Under Review

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

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Contacts

Contacts for the Integral Molten Salt Reactor (IMSR) Pre-Application Review

Lead Project Manager

Kevin Roche

Contact a Public Affairs Officer

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Page Last Reviewed/Updated Friday, December 12, 2025

Page Last Reviewed/Updated Friday, December 12, 2025