A Research Program for Fission Product/Dust Transport in HTGR’s
- Univ. of Missouri, Columbia, MO (United States)
High and Very High Temperatures Gas Reactors (HTGRs/VHTRs) have five barriers to fission product (FP) release: the TRISO fuel coating, the fuel elements, the core graphite, the primary coolant system, and the reactor building. This project focused on measurements and computations of FP diffusion in graphite, FP adsorption on graphite and FP interactions with dust particles of arbitrary shape. Diffusion Coefficients of Cs and Iodine in two nuclear graphite were obtained by the release method and use of Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) and Instrumented Neutron Activation Analysis (INAA). A new mathematical model for fission gas release from nuclear fuel was also developed. Several techniques were explored to measure adsorption isotherms, notably a Knudsen Effusion Mass Spectrometer (KEMS) and Instrumented Neutron Activation Analysis (INAA). Some of these measurements are still in progress. The results will be reported in a supplemental report later. Studies of FP interactions with dust and shape factors for both chain-like particles and agglomerates over a wide size range were obtained through solutions of the diffusion and transport equations. The Green's Function Method for diffusion and Monte Carlo technique for transport were used, and it was found that the shape factors are sensitive to the particle arrangements, and that diffusion and transport of FPs can be hindered. Several journal articles relating to the above work have been published, and more are in submission and preparation.
- Research Organization:
- Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1242965
- Report Number(s):
- DOE/NEUP-11-2982; 11-2982; TRN: US1600928
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
NEUTRON ACTIVATION ANALYSIS
GRAPHITE
NEUTRON TRANSPORT THEORY
HTGR TYPE REACTORS
FISSION PRODUCTS
NUCLEAR FUELS
ICP MASS SPECTROSCOPY
MONTE CARLO METHOD
DUSTS
IODINE
CESIUM
KNUDSEN FLOW
MASS SPECTROMETERS
TEMPERATURE RANGE 1000-4000 K
ADSORPTION ISOTHERMS
FUEL ELEMENTS
RESEARCH PROGRAMS
INTERACTIONS
FISSION PRODUCT RELEASE
MATHEMATICAL MODELS
MATHEMATICAL SOLUTIONS
GREEN FUNCTION
NEUTRON DIFFUSION EQUATION