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Title: Comparative Study of Laboratory-Scale and Prototypic Production-Scale Fuel Fabrication Processes and Product Characteristics

An objective of the High Temperature Gas Reactor fuel development and qualification program for the United States Department of Energy has been to qualify fuel fabricated in prototypic production-scale equipment. The quality and characteristics of the tristructural isotropic coatings on fuel kernels are influenced by the equipment scale and processing parameters. Some characteristics affecting product quality were suppressed while others have become more significant in the larger equipment. Changes to the composition and method of producing resinated graphite matrix material has eliminated the use of hazardous, flammable liquids and enabled it to be procured as a vendor-supplied feed stock. A new method of overcoating TRISO particles with the resinated graphite matrix eliminates the use of hazardous, flammable liquids, produces highly spherical particles with a narrow size distribution, and attains product yields in excess of 99%. Compact fabrication processes have been scaled-up and automated with relatively minor changes to compact quality to manual laboratory-scale processes. The impact on statistical variability of the processes and the products as equipment was scaled are discussed. The prototypic production-scale processes produce test fuels that meet fuel quality specifications.
Publication Date:
OSTI Identifier:
Report Number(s):
TRN: US1500001
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 7. International Topical Meeting on High Temperature Reactor Technology (HTR 2014), WeiHai (China), 27-31 Oct 2014
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; FABRICATION; NUCLEAR FUELS; COATED FUEL PARTICLES; COATINGS; QUALITY ASSURANCE; VARIATIONS; EXPERIMENTAL DATA; dvanced Gas Reactor (AGR); High Temperature Gas Reactor (HTGR); NGNP; Oak Ridge National Laboratory (ORNL); tristructural isotropic; Very High Temperature Reactor Technology Developme; FUELS