Assessment of grade H-451 graphite for replaceable fuel and reflector elements in HTGR
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Assessment of grade H-451 graphite for replaceable fuel and reflector elements in HTGR

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Published by Dept. of Energy, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

Subjects:

  • Nuclear fuel elements,
  • Graphite,
  • Gas cooled reactors

Book details:

Edition Notes

Statementby G. B. Engle
SeriesGA-A ; 14690
ContributionsUnited States. Dept. of Energy, General Atomic Company
The Physical Object
Pagination185 p. in various pagings :
Number of Pages185
ID Numbers
Open LibraryOL14879515M

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For H graphite, the measured initial void fraction is ɛ o = , which gives a value of φ o = that is also consistent with measured values 9. 4. Model Predictions. The graphite body was modeled as a hollow cylinder with inner radius R 1 = cm and outer radius R 2 = cm. The outer radius was obtained from the actual graphite-body dimensions and the inner radius was calculated to conserve Author: M.B. Richards, A.G. Gillespie, D.L. Hanson. The fuel and reflector elements in the reactor core of a Modular High-Temperature Gas-Cooled Reactor (MHTGR) use nuclear grade graphite H elements are subjected to spatially varying as well as time-varying fields of temperature and fast neutron flux. As the-result of a non- uniform temperature distribution, differential thermal strain (AE~). The GT-MHR core consists of fuel assemblies (FA) made of grade Hgraphite (Engle , Engle and Johnson ) in the form of perforated prismatic hexagonal elements. The core height and each cooling channel length correspond to the height of ten fuel assemblies. Abstract. The objectives of the Graphite Design Handbook (GDH) are to provide and maintain a single source of graphite properties and phenomenological model of mechanical behavior to be used for design of MHTGR graphite components of the Reactor System, namely, core support, permanent side reflector, hexagonal reflector elements, and prismatic fuel elements; to provide a single source of .

assessment is that the HTGR, with its unique capability to provide coolant temperatures to °C, provides two significant benefits; 1.) efficient electrical power generation, and 2.) the capability to supply process heat for a variety of industrial Size: 2MB.   Graphite components serve as structural support and as a neutron moderator in multiple nuclear power stations and is also a prospective material in Generation IV reactor concepts. The environment (e.g. high temperature and intense radiation) within a graphite core changes the geometry, microstructure and material properties of the graphite components, that could limit the lifetime (i.e. Author: José David Arregui-Mena, Robert N. Worth, Graham Hall, Philip D. Edmondson, Alain B. Giorla, Timothy. G-grade graphite is compared at room temperature and oF ( C). G-series Grades Specialty Materials • GSXP—a basic purified graphite having densities, strengths and resistivities typical of single-step impregnated graphite. • G-grade —a fine-grain structure, high strength, high density, purified graphiteFile Size: 1MB. Extruded Graphite Grade Comparisons Property Units Density g/cm3 Resistivity µ Flexural Stength Mpa 19 21 23 18 15 21 Compressive Strength Mpa 47 45 39 35 35

Get this from a library! Assessment of grade H graphite for replaceable fuel and reflector elements in HTGR. [G B Engle; United States. Department of Energy.; General Atomic Company.]. There are two subgrades of nuclear grade graphite used for the reactor internals components, the large rectangular nuclear grade and the cylindrical nuclear grade. The large rectangular grade graph- ite is a fine-grained, molded artificial graphite produced in large rectangular by: NBG is an established nuclear graphite grade for moderator and reflector applications in gas-cooled nuclear reactors. Prismatic-type reactors however require a material with lower maximum grain size due to the rather small spacing between cooling channels in the fuel block. hexagonal fuel elements in a cylindrical arrangement surrounded by a single ring of identically s ized solid graphite replaceable reflector elements, followed by.