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America Underway in Space on Nuclear Power

Document: america-underway-in-space-on-nuclear-power.pdf, two pages. No printed date. The Ignition page lists it as the nuclear power fact sheet, "Mar 24, 2026, 194.16 KB"; the download is 198,822 bytes, which is 194.16 KB (sources/manifest.csv). Text: sources/text/docs/2026-03-america-underway-in-space-on-nuclear-power.txt.

Summary. NASA's case for space fission, built on two missions: Space Reactor-1 (SR-1) Freedom, a nuclear electric propulsion spacecraft launching to Mars in December 2028, and Lunar Reactor-1 (LR-1), "a fission surface-power system designed to keep the Moon Base operating through periods of darkness", landing in 2030. SR-1 comes first, to retire "nuclear flight risk" before a lunar landing. It reuses the Gateway's Power and Propulsion Element.

Key points

  • Two dates (p. 1): "SR-1 Freedom launches December 2028 — first fission nuclear-powered interplanetary spacecraft"; "LR-1 lands on the Moon in 2030 — first fission nuclear reactor on the Moon".
  • Why nuclear (p. 1): "On the Moon, solar power depends on where you stand — even the best polar sites face days of darkness, and the permanently shadowed craters where ice exists see no sunlight at all. Martian dust storms block sunlight for weeks." "Nuclear fission is that power."
  • SR-1's mission (p. 1). Within 48 hours of launch it "starts a nuclear fission reactor and powers electric thrusters". At Mars it delivers "the Skyfall scientific payload: three Ingenuity-class helicopters equipped with cameras, ground-penetrating radar, and radios to survey potential human landing sites, search for subsurface water, and relay navigation data for future landers".
  • SR-1 leads to LR-1 (p. 1): "SR-1 is the first step in a deliberate sequence. It will inform and enable Lunar Reactor-1 (LR-1), a fission surface-power system designed to keep the Moon Base operating through periods of darkness and in locations where solar power alone cannot reach. By flying a reactor first — without the added complexity of a lunar landing — SR-1 retires nuclear flight risk, stimulates and qualifies the supply chain, and builds the necessary workforce."
  • An industrial base (p. 1): SR-1 and LR-1 are "the early beginnings of a domestic nuclear-space industrial base that scales to power permanent lunar outposts".
  • History (p. 1): "more than $20 billion across dozens of space nuclear programs" and "exactly one reactor — SNAP-10A, in 1965. It never left orbit."
  • Approach (pp. 1–2):
    • "A Mars launch window in December 2028 forces decisions"
    • "SR-1 would repurpose a nearly built, NASA-developed spacecraft bus — the Power and Propulsion Element"
    • "Mature uranium fuel form and Brayton power conversion — delivering more than 20 kilowatts of electrical power"
    • "NASA serves as prime integrator in close partnership with the Department of Energy and private sector innovators"
    • "SR-1 systems pave the way for LR-1 and follow-on efforts"

Where it sits against other sources

  • LR-1 and the Moon Base. This fact sheet ties LR-1 to the Moon Base by name, but to no phase. The Building the Moon Base fact sheet of the same day puts "initial nuclear-based power stations (potentially including both fission reactor and RTGs)" in Phase 2 and "An operational fission surface power station" in Phase 3, without naming LR-1. The wiki doesn't place LR-1 in a phase. See Lunar Nuclear Fission System.
  • The 20 kW figure is SR-1's, not LR-1's. The fact sheet gives no power level for LR-1.
  • Skyfall's search for subsurface water is on the subject of one Mars data gap, DN-002 M, "Surface and subsurface water content at surface exploration sites"; the pairing is the wiki's, not the fact sheet's. The wiki pairs Skyfall's other two tasks with no gap. SR-1 and Skyfall are on Mars-forward.

Lunar Nuclear Fission System · Gateway · Mars-forward · Power Systems · Ignition release · Ignition page