EGCR Graphite Permeability Tests: Results of Forced Flow Experiments on Egcr Moderator-Grade Graphite

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Helium-permeability and porosity were determired at room temperature for specimens from a typical EGCR moderator-grade graphite block. Permeability, at a mean pressure of 2 atm, ranged from 26 to 200 (av. 86.5) millidarcys. Permeability data indicated that turbalent flow was never obtained with helium in these tests and that helium permeating the moderator graphite at EGCR operating conditions (taken to be: 600 deg C; DELTA P, 10 lb/in./sup 2/ per inch of graphite; mean P, 400 lb/in./sup 2/) was in the viscous flow region. Daroy's law and the reported constants are applicable for flow computations involving moderator graphite under these ... continued below

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17 p.

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Ward, W. T. & Truitt, J. March 24, 1961.

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Description

Helium-permeability and porosity were determired at room temperature for specimens from a typical EGCR moderator-grade graphite block. Permeability, at a mean pressure of 2 atm, ranged from 26 to 200 (av. 86.5) millidarcys. Permeability data indicated that turbalent flow was never obtained with helium in these tests and that helium permeating the moderator graphite at EGCR operating conditions (taken to be: 600 deg C; DELTA P, 10 lb/in./sup 2/ per inch of graphite; mean P, 400 lb/in./sup 2/) was in the viscous flow region. Daroy's law and the reported constants are applicable for flow computations involving moderator graphite under these conditions. Porosity ranged from 20.6 to 29.4% (av. 23.8%), and there was no correlation between porosity and pemaesbility variations. The large variations encountered were believed to reflect the nonuniformity of the specimens, since duplicate determinations showed excellent agreement. Permeabilfty did not change appreciably with direction of flow and did not vary consistently with respect to the extrusion or any other axis. Preparation of the specimens did not appear to introduce appreciable surface effects. (auth)

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17 p.

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: CF-61-3-99
  • Grant Number: None
  • DOI: 10.2172/4036105 | External Link
  • Office of Scientific & Technical Information Report Number: 4036105
  • Archival Resource Key: ark:/67531/metadc867648

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Creation Date

  • March 24, 1961

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 12, 2017, 2:20 p.m.

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Ward, W. T. & Truitt, J. EGCR Graphite Permeability Tests: Results of Forced Flow Experiments on Egcr Moderator-Grade Graphite, report, March 24, 1961; Tennessee. (digital.library.unt.edu/ark:/67531/metadc867648/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.