R1
Overview
Antares' commercial factory-built microreactor: a TRISO-fueled prismatic graphite core with graphite and boron carbide control drums, passive sodium heat pipes, a fin-and-tube primary heat exchanger, and a recuperated nitrogen closed Brayton cycle at under 300 psi. Packaged with integrated shielding and a transport cradle for defense-critical assets, rated at 100 kWe to 1 MWe for 6+ years without refueling and without a grid connection.
Physics of the core were validated by Mark-0's June 4, 2026 zero-power criticality. The first electricity-producing article is the Mark-1, targeted for 2027 at INL using the same facility and HALEU TRISO batch. Initial production deployments to defense customers are targeted for 2028, including Joint Base San Antonio under ANPI and Fort Bragg under Janus.