CHEMICAL PROBLEMS IN ADVANCED GAS-COOLED REACTORS

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The chemical problems largely involve gas- and solidphase chemistry where chemical reactions and physicochemical processes occur at elevated temperatures ( approximately 4000 deg F). The high temperatures require that the fuel bodies and moderator be made of refractory materials and may preclude the use of metal cladding. Areas of concern include reactor materials and primary coolant systems, where most of the problems involve mass transfer. Reactions are discussed which can lead to carbon transfer in a gas-cooled graphite reactor. Substantial mass transfer can be expected from gas-phase diffusion across a gap caused by equilibrium concentration shifts when the gap boundaries ... continued below

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Zumwalt, L.R. December 1, 1960.

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Description

The chemical problems largely involve gas- and solidphase chemistry where chemical reactions and physicochemical processes occur at elevated temperatures ( approximately 4000 deg F). The high temperatures require that the fuel bodies and moderator be made of refractory materials and may preclude the use of metal cladding. Areas of concern include reactor materials and primary coolant systems, where most of the problems involve mass transfer. Reactions are discussed which can lead to carbon transfer in a gas-cooled graphite reactor. Substantial mass transfer can be expected from gas-phase diffusion across a gap caused by equilibrium concentration shifts when the gap boundaries are at different temperatures. Reactions are discussed which show how coolant impurities can lead to fuel migration. Activated charcoal appears to be a most useful agent for removing volatile-fission-product activities from-the reactor coolant. In regard to the minimization of hightemperature vaporization processes, the carbide-- graphite systems appear better than the oxide systems because the fuel material carbides are less volatile than the oxides in the presence of graphite. The vapor pressures are tabulated for gas-cooled-reactor fuel materials. (B.O.G.)

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  • Other Information: Project No. 32. Orig. Receipt Date: 31-DEC-61

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  • Report No.: GA-1730
  • Grant Number: AF(04-3)-314
  • DOI: 10.2172/4088620 | External Link
  • Office of Scientific & Technical Information Report Number: 4088620
  • Archival Resource Key: ark:/67531/metadc863102

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 1, 1960

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 28, 2016, 3:52 p.m.

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Zumwalt, L.R. CHEMICAL PROBLEMS IN ADVANCED GAS-COOLED REACTORS, report, December 1, 1960; United States. (digital.library.unt.edu/ark:/67531/metadc863102/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.