Properties influencing high-temperature gas-cooled reactor coated fuel particle performance
Journal Article
·
· Nucl. Technol.; (United States)
OSTI ID:7085278
Properties affecting the irradiation performance of outer pyrolytic carbon (PyC) layers on Triso- and Biso-coated fuel particles were studied. Irradiation temperatures were 1000 to 1500/sup 0/C (1273 to 1773 K). Fast-neutron fluences reached 12.4 x 10/sup 25/ n/m/sup 2/ (E greater than 29 fJ)/sub HTGR/, which is 55 percent beyond the large high-temperature gas-cooled reactor peak design exposure of 8.0 x 10/sup 25/ n/m/sup 2/. Coatings with densities between 1.85 and 1.95 Mg/m/sup 3/ and mean optical anisotropy values of equal to or less than 1.03 (BAF/sub 0/ units) exhibited the best irradiation performance on Triso particles. For Biso particles, it is necessary to deposit the outer layer at coating rates between 3 and 8 ..mu..m/min and with densities equal to or greater than 1.84 Mg/m/sup 3/ to produce coatings impermeable to fission gases after irradiation. Data from fuel rod tests show that it is important to limit the degree of surface-connected porosity of the outer PyC layer and the amount of binder phase in the matrix to prevent coating failures resulting from coating-matrix interactions.
- Research Organization:
- General Atomic Co., San Diego, CA
- OSTI ID:
- 7085278
- Journal Information:
- Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 35:2; ISSN NUTYB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210300* -- Power Reactors
Nonbreeding
Graphite Moderated
36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
CARBON
COATED FUEL PARTICLES
COATINGS
DENSITY
ELEMENTS
FUEL PARTICLES
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
NONMETALS
PERFORMANCE
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POROSITY
PYROLYTIC CARBON
RADIATION EFFECTS
REACTORS
210300* -- Power Reactors
Nonbreeding
Graphite Moderated
36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
CARBON
COATED FUEL PARTICLES
COATINGS
DENSITY
ELEMENTS
FUEL PARTICLES
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
NONMETALS
PERFORMANCE
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POROSITY
PYROLYTIC CARBON
RADIATION EFFECTS
REACTORS