Detection and control of as-produced pyrocarbon permeability in biso-coated high-temperature gas-cooled reactor fuel particles

Stinton, D.P.; Thiele, B.A.; Lackey, W. J.; Morgan, C.S.

doi:10.2172/5364663

Cited by 2 publications

(8 citation statements)

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“…Internal thermocouples, external thermocouples and pyrometers all have limitations. Past studies have shown that the anisotropy of pryrocarbon layers decreases with increasing coating temperature and increasing coating rate [12,14,16]. Figure 3 shows trends of equivalent anisotropy versus temperature, coating gas fraction, and average coating rate 1 for the two-inch diameter coater used to produce AGR-1 particles.…”

Section: Agr-1 Fuel Includes Particles Withmentioning

confidence: 94%

“…Due to the IPyC layer being applied at a higher temperature, variant 1 particles have a lower IPyC density and a lower anisotropy than baseline particles. Increasing the coating gas fraction, as was done for variant 2 particles, is an alternative means of increasing the coating rate and generally results in a lower anisotropy [14]. However, for the AGR-1 particles, the anisotropies of baseline particles and variant 2 particles were nearly equivalent (0.0074 diattenuation for baseline particles compared to 0.0075 for variant 2 particles).…”

Section: Pyrolytic Carbon Layersmentioning

confidence: 99%

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Results of Tests to Demonstrate a Six-Inch Diameter Coater for Production of TRISO-Coated Particles for Advanced Gas Reactor Experiments

Barnes

Marshall

Hunn

et al. 2008

Fourth International Topical Meeting on High Temperature Reactor Technology, Volume 1

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The Next Generation Nuclear Plant (NGNP)/Advanced Gas Reactor (AGR) Fuel Development and Qualification Program includes a series of irradiation experiments in Idaho National Laboratory's (INL's) Advanced Test Reactor. TRISOcoated particles for the first AGR experiment, AGR-1, were produced at Oak Ridge National Laboratory (ORNL) in a twoinch diameter coater. A requirement of the NGNP/AGR Program is to produce coated particles for later experiments in coaters more representative of industrial scale. Toward this end, tests have been performed by Babcock and Wilcox (B&W) in a six-inch diameter coater. These tests are expected to lead to successful fabrication of particles for the second AGR experiment, AGR-2.While a thorough study of how coating parameters affect particle properties was not the goal of these tests, the test data obtained provides insight into process parameter/coated particle property relationships. Most relationships for the six-inch diameter coater followed trends found with the ORNL two-inch coater, in spite of differences in coater design and bed hydrodynamics. For example the key coating parameters affecting pyrocarbon anisotropy were coater temperature, coating gas fraction, total gas flow rate and kernel charge size. Anisotropy of the outer pyrolytic carbon (OPyC) layer also strongly correlates with coater differential pressure.In an effort to reduce the total particle fabrication run time, silicon carbide (SiC) was deposited with methyltrichlorosilane (MTS) concentrations up to 3 mol %. Using only hydrogen as the fluidizing gas, the high concentration MTS tests resulted in particles with lower than desired SiC densities. However when hydrogen was partially replaced with argon, high SiC densities were achieved with the high MTS gas fraction.

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Section: Agr-1 Fuel Includes Particles Withmentioning

confidence: 94%

Section: Pyrolytic Carbon Layersmentioning

confidence: 99%

Results of Tests to Demonstrate a Six-Inch Diameter Coater for Production of TRISO-Coated Particles for Advanced Gas Reactor Experiments

Barnes

Marshall

Hunn

et al. 2008

Fourth International Topical Meeting on High Temperature Reactor Technology, Volume 1

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show abstract

“…For a given layer thickness, the coating permeability has been shown to be related to porosity and bulk density of the coating. 7 Low density pyrocarbon layers, less than about 1.85 g/cm 3 , tend to be permeable. 7 Also layers with greater than about 3-4% open porosity tend to be permeable.…”

Section: Ipyc Anisotropy and Permeabilitymentioning

confidence: 99%

“…7 Low density pyrocarbon layers, less than about 1.85 g/cm 3 , tend to be permeable. 7 Also layers with greater than about 3-4% open porosity tend to be permeable. 7 Process variables that affect density and porosity, and hence permeability, include temperature, deposition rate and coater batch size.…”

Section: Ipyc Anisotropy and Permeabilitymentioning

confidence: 99%

“…7 Also layers with greater than about 3-4% open porosity tend to be permeable. 7 Process variables that affect density and porosity, and hence permeability, include temperature, deposition rate and coater batch size. 7,8 In one study involving coating with a propylene/acetylene mixture in a 240-mm coater, high density coatings, which were generally gastight, were produced at temperatures in the 1150-1250 o C range.…”

Section: Ipyc Anisotropy and Permeabilitymentioning

confidence: 99%

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AGR-1 Fuel Product Specification and Characterization Guidance

Barnes

2006

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Detection and control of as-produced pyrocarbon permeability in biso-coated high-temperature gas-cooled reactor fuel particles

Cited by 2 publications

References 0 publications

Results of Tests to Demonstrate a Six-Inch Diameter Coater for Production of TRISO-Coated Particles for Advanced Gas Reactor Experiments

Results of Tests to Demonstrate a Six-Inch Diameter Coater for Production of TRISO-Coated Particles for Advanced Gas Reactor Experiments

AGR-1 Fuel Product Specification and Characterization Guidance

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