Total hemispherical emissivity of very high temperature reactor (VHTR) candidate materials: Hastelloy X, Haynes 230, and Alloy 617

MOspace/Manakin Repository

Breadcrumbs Navigation

Total hemispherical emissivity of very high temperature reactor (VHTR) candidate materials: Hastelloy X, Haynes 230, and Alloy 617

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/14216

[+] show full item record


Title: Total hemispherical emissivity of very high temperature reactor (VHTR) candidate materials: Hastelloy X, Haynes 230, and Alloy 617
Author: Maynard, Raymond K.
Keywords: next generation nuclear reactor
very high temperature reactors
energy production
emissivity
Date: 2011
Publisher: University of Missouri--Columbia
Abstract: An experimental system was constructed in accordance with the standard ASTM C835-06 to measure the total hemispherical emissivity of structural materials of interest in Very High Temperature Reactor (VHTR) systems. The system was tested with 304 stainless steel as well as oxidized and un-oxidized nickel, and good reproducibility and agreement with the literature data was found. Emissivity of each candidate material was measured over a wide range of temperatures, with conditions that included: i) 'as received' (original sample) from the supplier; ii) increased surface roughness; iii) oxidized, and; iv) graphite coated. The emissivity of as-received materials increased with temperature for Hastelloy X (from 0.18 at 473 K to 0.28 at 1498 K), Haynes 230 (from 0.178 at 600 K to 0.235 at 1375 K), and Alloy 617 (about 0.2 at 600 K to about 0.35 at 1275 K). Oxidation was found to increase emissivity, but as there is some oxidation of these materials used in the construction of VHTRs, this represents an essentially neutral finding in terms of the safety implications in post-accident VHTR environments. However, a coating of graphite powder was shown to substantially increase emissivity, and this has strong favorable safety implications in terms of decay heat removal in post-accident VHTR environments.
URI: http://hdl.handle.net/10355/14216
Other Identifiers: MarynardR-072611-D600

This item appears in the following Collection(s)

[+] show full item record