OUTGASSING BEHAVIOR OF EGCR MODERATOR GRAPHITE | Zendy

Jeannie Blakely | Zendy; L.G. Overholser | Zendy

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OUTGASSING BEHAVIOR OF EGCR MODERATOR GRAPHITE

Author(s) -

Jeannie Blakely,

L.G. Overholser

Publication year - 1964

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/4064541

Subject(s) - graphite , outgassing , volume (thermodynamics) , materials science , analytical chemistry (journal) , composite material , thermodynamics , chemistry , physics , chromatography , organic chemistry

The outgassing characteristics of specimens of the EGCR moderator graphite stock were determined in vacuo to a maximum temperature of 1000 deg C using external resistance heating and to 1800 deg C by induction heating. The specimens examined were cut from several locations in two of the 18-in. x 18-in. x 20-ft graphite bars which had been prepared under fabrication conditions comparable to those used for the graphite columns present in the Experimental Gas- Cooled Reactor. Data are given which show the effect of the position of sampling of the bars on the density of the graphite. The volume and composition of desorbates obtained at 300, 600, and 1000 deg C as a function of specimen size and position of specimen within the bars also are given. The volume-time relationships at 300 and 600 deg C can be expressed satisfactorily by v = A log t + B over extended intervals of time. A linear relationship prevails at 1000 deg C only after heating for longer than approximates 800 min. The volume and composition of the desorbates obtained at 1000, 1400, and 1800 deg C using induction heating are tabulated. (auth

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