IMSR ▼ -1.3% - Terrestrial Energy Inc. $IMSR - Terrestrial Energy Submits Graphite Topical Report to NRC, Advancing IMSR Plant Regulatory Program Terrestrial Energy submitted a graphite topical report to the Nuclear Regulatory Commission as part of its regulatory approval process for the IMSR plant design, a milestone in advancing the company's small modular reactor program. Despite the regulatory progress, shares fell 1.3% today, suggesting investors may have been expecting a more substantial development or were taking profits on recent gains in the nuclear energy sector. 10-SEP-2026 08:04 AM ET