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This material has been suggested as a possible reactor material for a variety of reasons. HastX is a material with decent high temperature characteristics. Hastelloy is also noted for excellent corrosion, oxidation and carburization resistance at the desired temperatures. Finally, Hastelloy-X is a commonly used metal whose properties are well understood. The expected peak temperature of Hastelloy-X is roughly 875 K when used for the pressure vessel of the reactor. 21 Mechanical Properties Figure 3-6 shows the Yield Strength, 1/3 UTS, and 1% creep at 10000 hours (approximately 1 year).

There has been little indication that such a breakthrough has been made to date. 1% carbon into the Nb1Zr alloy. This increases the creep strength properties by 30-40% while not changing the thermal properties. It would probably merit further investigation as a material choice. 4 Hastelloy X Hastelloy X (HastX) is a nickel-based superalloy used in a variety of applications [Brown, 1992]. 5% tungsten. 22 g/cc. This material has been suggested as a possible reactor material for a variety of reasons.

6 kgs of 235U would be consumed. 86% for the upper end of the uranium consumed. This burnup results in a loss of $1 reactivity. 2 Reactor Multiplication Vs Reflector Position The primary goal of this study was to ensure that there was sufficient excess reactivity in the neutron multiplication factor to keep the reactor critical for the 10 year lifespan while ensuring that the reactor would be subcritical during major accident scenarios. The position of the reflector can be used to set the multiplication factor of the reactor.

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A 50-100 kWe Gas-Cooled Reactor for Use on Mars


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