SR1 Freedom

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SR1

SR1, SR-1, SR.1 or Sr1 may refer to:

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• SR-1 Freedom

  Steady icon Subscribe with Steady # SR-1 Freedom Home Spacecraft by country USA SR-1 Freedom (notional concept) [NASA] The SR-1 Freedom (Space Reactor 1 Freedom) is a proposed nuclear-electric propulsion technology demonstrator spacecraft developed by NASA in cooperation with the United States Department of Energy. Announced in 2026, the spacecraft is intended to become the first interplanetary mission powered by a nuclear fission reactor and is scheduled for launch toward Mars in December 2028. [...] SR-1 is jointly sponsored by NASA and the United States Department of Energy as part of broader efforts to develop long-duration nuclear power systems for spaceflight. Mission data is expected to support development of Lunar Reactor-1 (LR-1), a proposed lunar surface fission power system intended to provide continuous electrical power for future lunar bases during extended lunar night periods. [...] SR-1 combines a closed Brayton-cycle nuclear fission reactor with the Power and Propulsion Element (PPE) originally developed for the Lunar Gateway station. The reactor is designed to generate more than 20 kilowatts of electrical power using high-assay low-enriched uranium (HALEU) uranium dioxide fuel. Radiation shielding is provided by boron carbide structures surrounding the reactor assembly. The spacecraft uses solar-electric propulsion hardware integrated into the PPE section.

• Space Reactor‑1 Freedom - Wikipedia

  Space Reactor-1 Freedom (SR-1) is a pathfinder NASA spacecraft intended to be the first nuclear fission-powered interplanetary mission and to demonstrate nuclear electric propulsion (NEP) in deep space. Announced in March 2026, the spacecraft would combine a closed Brayton cycle fission reactor generating more than 20 kW of electrical power with the Power and Propulsion Element (PPE) previously developed for the Lunar Gateway space station. ## Proposed technical specifications [edit] The fission reactor is to be fueled by high-assay low-enriched uranium (HALEU), using uranium dioxide fuel encased in a boron carbide radiation shield, and will use existing designs for the Department of Energy's research reactors. [...] The mission, jointly sponsored by NASA and the United States Department of Energy, is intended to demonstrate nuclear propulsion and power technologies for sustained exploration beyond the Moon, including future missions to Mars and the outer Solar System. Data from SR-1 is also expected to support development of Lunar Reactor-1 (LR-1), a fission surface power (FSP) system designed to provide continuous energy for a lunar base during periods without sunlight. ## Funding and management [edit]

• Space Reactor‑1 Freedom - Wikipedia

  3 weeks ago - Space Reactor-1 Freedom (SR-1) is a pathfinder NASA spacecraft intended to be the first nuclear fission-powered interplanetary mission and to demonstrate nuclear electric propulsion (NEP) in deep space. Announced in March 2026, the spacecraft would combine a closed Brayton cycle fission reactor

• Space Reactor-1 Freedom - by Ex Terra Media, LLC

  BWX Technologies (NYSE: BWXT) is the only publicly traded pure-play nuclear space contractor with confirmed flight hardware deliverables in the recent program record. BWXT was selected to supply the nuclear reactor and fuel for DARPA’s Demonstration Rocket for Agile Cislunar Operations (DRACO) program — a nuclear thermal propulsion demonstration that DARPA canceled in 2025 due to changing technologies and requirements, prior to and independently from the SR-1 Freedom program’s development. SR-1 Freedom is a nuclear electric propulsion program that draws on the industrial base capabilities developed under DRACO but is not a continuation or successor of it; BWXT’s role as the most qualified commercial nuclear reactor fabricator for space applications is preserved under SR-1’s architecture, [...] ## The Hardware Reality SR-1 Freedom’s architecture is engineered for speed, not maximum performance, and that choice has direct supply chain implications. NASA is combining a closed Brayton cycle fission reactor generating more than 20 kilowatts of electrical power with the Power and Propulsion Element (PPE) previously built and tested for the Lunar Gateway space station — a program NASA has since canceled. The reactor will be fueled by high-assay low-enriched uranium (HALEU), using uranium dioxide fuel encased in a boron carbide radiation shield. The PPE’s ion thrusters — already qualified hardware — will be driven by the reactor’s electrical output rather than solar panels, making SR-1 the first spacecraft to use fission-generated electricity for interplanetary propulsion. [...] The National Aeronautics and Space Administration’s (NASA) March 23, 2026 announcement of Space Reactor-1 (SR-1) Freedom is not a science mission story — it is a government-financed first article for the nuclear space industrial base. NASA explicitly stated the mission will “activate the industrial base for future fission power systems across propulsion, surface, and long-duration missions,” naming a December 2028 launch window that creates a hard 32-month countdown for supply chain positioning. That urgency is now amplified by a second policy signal: on April 14, 2026, the White House issued National Security and Technology Memorandum-3 (NSTM-3), formally launching the National Initiative for American Space Nuclear Power and directing NASA to develop a mid-power space reactor of at least

• NASA’s Nuclear-Powered Mars Mission: SR-1 Freedom Explained

  [0:38] Reactor 1 Freedom. It's a mission launching in December of 2028 designed to demonstrate the capabilities of using nuclear fishision in space to power [0:47] electric thrusters. Nuclear technology has existed for decades, but there's never been the will to make it happen. [0:53] It hasn't had a purpose. This is what SR1 is designed to address. It provides a destination Mars, a timeline, the next [1:00] Mars transfer window, and the leadership, NASA, to make nuclear power in space a reality. Those have fed the mission objectives outlined by NASA's [1:08] program executive of fish and surface power, Steve Synore. Demonstrate nuclear electric propulsion, launch in the next Mars transfer window, leverage existing [...] # NASA’s Nuclear-Powered Mars Mission: SR-1 Freedom Explained ## Channel: BREAKINGspace 26K subscribers 4.1K likes ### Description 110,335 views Posted: 2026-03-24 NASA just announced one of the most exciting missions in its history: Space Reactor-1 Freedom (SR-1), a nuclear-powered spacecraft launching in December 2028 that will demonstrate nuclear electric propulsion on the way to Mars. Led by Administrator Jared Isaacman, the mission repurposes the already-built and tested Lunar Gateway Power and Propulsion Element, pairing it with a 20+ kW fission reactor using High-Assay Low-Enriched Uranium to power advanced ion thrusters for highly efficient deep-space travel. [...] [1:58] conversion system. Now that's a lot of words but in simplified terms it's a high efficiency closed loop heat engine. [2:04] This is the system which will take in the thermal energy from the reactor and convert it into electrical energy to be used by the thrusters. This is an [2:11] important distinction to note. SR1 freedom will utilize nuclear electric propulsion or NEP not nuclear thermal [2:19] propulsion or NTP. You may be aware of that technology through the Nerva engine program from the 60s or if you're a fan of Kerbal Space Program, which features [2:27] a nuclear thermal engine in game. SR1's reactor will only be used to generate electricity to accelerate the zenon coming out of the ion thrusters. In