nuclear rockets
MAS 603 - Aircraft and Spacecraft DevelopmentA few pounds of nuclear fuel can produce many megawatts of power for several years. Provided appropriate safety precautions are taken, NASA believes that space nuclear power systems are fully acceptable. All rockets use a principle called the reaction engine. Chemical rockets already run at temperatures that approach the limits of the materials in the combustion chamber and nozzle. Chemical rockets have a low maximum velocity increment, which means that their exhaust velocities are not high enough to impart very high speeds to the rocket. A nuclear rocket such as this would be inherently safe and environmentally benign: contrary to popular belief, a nuclear rocket need not be strongly radioactive when launched. The spacecraft, with its nuclear thrusters, would be launched as a payload atop a conventional chemical rocket. Then, once the payload was in high-Earth orbit, the nuclear reactor would start up. For a given amount of propellant mass, the nuclear rocket will travel three times faster than the chemical rocket. The intense neutron and gamma ray radiation fields produced by the operating reactor are c
Therefore, they generally run on plutonium 238 power sources, which are highly radioactive even during launch. After the full power burn of the engine, the radiation from the reactor will be only gamma rays and within a few days, the intensity will have dropped by over three orders of magnitude. Rocket propellant efficiency is measured in specific impulse (Isp). As was proven by the X-33 failure, attempting to use a large number of unproven technologies can lead to uncertain results. Eventually, we will want to send astronauts to the planet's surface and to their moons (Powell, 1999). A nuclear rocket such as this would be inherently safe and environmentally benign: contrary to popular belief, a nuclear rocket need not be strongly radioactive when launched. An even more mission appropriate way to view the situation is that the mass of propellant required at takeoff would be 3 times greater for the chemical rocket. This slowing down process that the neutron goes through is referred to moderation. Propulsion Systems for Space Flight. Control drums composed of cylinders that are beryllium on one side to absorb neutrons and Li4 H on the other to reflect neutrons, surround the cylindrical core.
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