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Trump leaves space nuclear policy executive order for Biden team
A hot fire test of the core stage for NASA’s Space Launch System rocket at Stennis Space Center in Mississippi was not completed as planned. The SLS is the vehicle meant to propel a crewed mission to the moon in 2024. Source: NASA Television
Among the executive orders President Trump issued during his last weeks in office was “Promoting Small Modular Reactors for National Defense and Space Exploration,” which builds on the Space Policy Directives published during his term. The order, issued on January 12, calls for actions within the next six months by NASA and the Department of Defense (DOD), together with the Department of Energy and other federal entities. Whether the Biden administration will retain some, all, or none of the specific goals of the Trump administration’s space nuclear policy remains to be seen, but one thing is very clear: If deep space exploration remains a priority, nuclear-powered and -propelled spacecraft will be needed.
The prospects for near-term deployment of nuclear propulsion and power systems in space improved during Trump’s presidency. However, Trump left office days after a hot fire test of NASA’s Space Launch System (SLS) rocket did not go as planned. The SLS rocket is meant to propel crewed missions to the moon in 2024 and to enable a series of long-duration lunar missions that could be powered by small lunar reactor installations. The test on January 16 of four engines that were supposed to fire for over eight minutes was automatically aborted after one minute, casting some doubt that a planned November 2021 Artemis I mission can go ahead on schedule.
D. R. Harding, W. T. Shmayda
Fusion Science and Technology | Volume 63 | Number 2 | March-April 2013 | Pages 125-131
Technical Paper | Selected papers from 20th Target Fabrication Meeting, May 20-24, 2012, Santa Fe, NM, Guest Editor: Robert C. Cook | dx.doi.org/10.13182/FST13-A16329
Articles are hosted by Taylor and Francis Online.
The process of filling targets with D-T for cryogenic experiments on the OMEGA laser induces small-scale features on the inner surface of the plastic capsules. Each feature was a cluster of low-level domes (<0.1 m high) with individual lateral dimensions <5 m that collectively covered lateral dimensions of up to 300 m2 . These features were observed only when a high radiation dose was combined with high stress in the plastic wall, as occurs when the capsules are permeation filled and transferred at cryogenic temperatures. No porosity or void structure was observed in or below these domes. It is speculated that the domes are a swelling caused by radiation-induced bond scission and chemical restructuring that reduces the plastic density in localized regions.