Canada's Terrestrial Energy Plans to Split IMSR Licensing to Accelerate Conventional Facility Construction and Financing

Recently, Canadian nuclear innovation company Terrestrial Energy announced that it has submitted a key topical report to the U.S. Nuclear Regulatory Commission (NRC). The company plans to license its Integral Molten Salt Reactor (IMSR) power plant as two separate parts—the nuclear facility and the Thermal and Electric Facility (TEF)—allowing the non-nuclear portion to be built and operated as a conventional industrial project before obtaining nuclear licensing.

It is understood that the IMSR, as a Generation IV small modular reactor, uses molten salt as both fuel and coolant, and can directly supply heat to industrial facilities or be used for power generation. If the topical report is approved, the site-customizable TEF facilities will not be classified as nuclear facilities, thereby allowing developers to use auxiliary heat sources such as natural gas to carry out construction and supply electricity and heat in advance while waiting for nuclear construction permits, building a transitional bridge for subsequent connection to nuclear energy.

The report submitted by Terrestrial Energy demonstrates that the safe operation of the plant's nuclear systems does not depend on the TEF, and that any malfunction from the TEF can be effectively isolated from the nuclear systems. The company's CEO Simon Irish pointed out that this regulatory pathway will greatly simplify the financing and construction process of the entire IMSR product line, limiting the originally lengthy nuclear licensing timeline to only the nuclear facility portion, thereby reducing the overall investment risk of the project.

Currently, Terrestrial Energy is advancing a series of IMSR deployment plans, including building a demonstration power plant at the RELLIS Campus of Texas A&M University, and providing advanced nuclear technology support for the energy supply project at the U.S. Army's Aberdeen Proving Ground in Maryland. Since initiating pre-application engagement in 2019, this submission is also the company's third core topical report submitted to the NRC in 2026.