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Design goals for the MMRTG included ensuring a high degree of safety, optimizing power levels over a minimum lifetime of 14 years, and minimizing weight. [2] The MMRTG has a length of 66.83 cm (26.31 in), and without the fins it has a diameter of 26.59cm (10.47 in), while with the fins it has a diameter of 64.24cm (25.29).
NASA has developed a multi-mission radioisotope thermoelectric generator (MMRTG) in which the thermocouples would be made of skutterudite, a cobalt arsenide (CoAs 3), which can function with a smaller temperature difference than the current tellurium-based designs. This would mean that an otherwise similar RTG would generate 25% more power at ...
It would have produced 140 watts of electricity using a quarter of the plutonium an RTG or MMRTG needs. [11] The two finished units had these expected specifications: [12] ≥14-year lifetime; Nominal power: 130 W; Mass: 32 kg (71 lb) System efficiency: ≈ 26%; Total mass of plutonium-238-dioxide: 1.2 kg (2.6 lb)
The Dragonfly rotorcraft will weigh approximately 450 kg (990 lb) and be packaged inside a heatshield of 3.7 m (12 ft) diameter. [3] Regolith samples are to be obtained by two sample acquisition drills and hoses, one on each landing skid, for delivery to the mass spectrometer instrument.
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For example, the RBMK reactors at the Ignalina Nuclear Power Plant in Lithuania were rated at 1500 MWe each, a very large size for the time and even for the early 21st century. For comparison, the EPR has a net electric nameplate capacity of 1600 MW (4500 MW thermal) and is among the most powerful reactor types ever built.
A permanent magnet synchronous generator is a generator where the excitation field is provided by a permanent magnet instead of a coil. The term synchronous refers here to the fact that the rotor and magnetic field rotate with the same speed, because the magnetic field is generated through a shaft-mounted permanent magnet mechanism, and current is induced into the stationary armature.
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