IDAHO FALLS, Idaho–(BUSINESS WIRE)–Antares, a nuclear fission energy company developing microreactors for defense and space applications, today announced that the U.S. Department of Energy (DOE) has approved the company’s Preliminary Documented Safety Analysis (PDSA) for its Mark-0 reactor, Antares’ first demonstration reactor, scheduled to achieve criticality before July 4, 2026 under DOE’s Reactor Pilot Program. The PDSA is an important milestone. With this approval, the DOE is certifying t