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- W1569466382 abstract "Refabricated HTGR fuel rods will contain from approx. 0.15 to 0.5 g /sup 233/U and/or /sup 235/U. The fuel rods are approx. 16 mm in diameter and 62 mm long. A typical commercial fuel refabrication facility will have six fuel rod production lines, each producing approximately one fuel rod every 4 seconds at design capacity. One on-line assay device will be present for each two production lines. The relative standard deviation in an individual fuel rod fissile material measurement must be less than 3% to satisfy process and quality control requirements. Systematic errors must be kept less than approx. 0.3% for fissile material measured in fuel rods produced over two months to satisfy material accountability requirements. Several nondestructive assay (NDA) methods were investigated. Because the gamma-ray activity of the refabricated fuel is relatively high due to the presence of /sup 232/U in the fuel and because the gamma-ray activity is not directly related to total or fissile uranium content, NDA methods employing gamma-ray detection did not appear practicable. A method using thermal neutron irradiation and fast-fission neutron detection was selected. An experimental assay device was fabricated based on this NDA method. Experiments were performed to determine the precision and accuracy of the measurements and to investigate potential interferences and systematic errors. Operating procedures were evaluated, and analysis procedures were identified." @default.
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- W1569466382 date "1979-11-01" @default.
- W1569466382 modified "2023-10-17" @default.
- W1569466382 title "Design and evaluation of an on-line fuel rod assay device for an HTGR fuel refabrication plant" @default.
- W1569466382 doi "https://doi.org/10.2172/5767839" @default.
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