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

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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

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dc.contributor.advisor Ghosh, Tushar K., Dr. en_US
dc.contributor.author Maynard, Raymond K.
dc.date.accessioned 2012-05-17T20:51:41Z
dc.date.available 2012-05-17T20:51:41Z
dc.date.issued 2011
dc.date.submitted 2011 Summer en_US
dc.identifier.other MarynardR-072611-D600
dc.identifier.uri http://hdl.handle.net/10355/14216
dc.description "July 2011" en_US
dc.description The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. en_US
dc.description Title from PDF of title page (University of Missouri--Columbia, viewed on May 17, 2012). en_US
dc.description Dissertation advisor: Dr. Tushar K. Ghosh en_US
dc.description Vita. en_US
dc.description Includes bibliographical references. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Nuclear engineering. en_US
dc.description.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. en_US
dc.format.extent xi, 74 pages en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.relation.ispartof 2011 Freely available dissertations (MU) en_US
dc.subject next generation nuclear reactor en_US
dc.subject very high temperature reactors en_US
dc.subject energy production en_US
dc.subject emissivity en_US
dc.title Total hemispherical emissivity of very high temperature reactor (VHTR) candidate materials: Hastelloy X, Haynes 230, and Alloy 617 en_US
dc.type Thesis en_US
thesis.degree.discipline Nuclear engineering en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name Ph. D. en_US
thesis.degree.level Doctoral en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Dissertations. 2011 Dissertations


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