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Completed TRL 5 (started at 3, targeting 5)
Previous space reactor development programs (e.g. SP-100, Prometheus) have failed to complete the all-important system- level demonstration. The Nuclear Systems Project will demonstrate fission power subsystem technology readiness in a relevant environment for two classes of NASA's mission requirements: 10-100's kWe for exploration outposts and nuclear electric propulsion via the Technology Demonstration Unit (TDU), and 1-10 kWe for robotic science and small exploration systems (Kilopower).
Listed on TechPort itself — the most direct way to ask about this specific project.
This is early/mid-stage (TRL 5) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.
None of these are guaranteed paths for this specific project — TechPort itself doesn't have an "apply" button. Reaching out to the contact(s) above with a specific question is usually the fastest way to find out what's actually open.