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- W3179295355 abstract "Transport and deposition of fission products in the primary system of a small pebble bed high temperature reactor with directly coupled gas turbine have been investigated. The reactor has a thermal power of 40 MW and is intended for heat and power cogeneration. Four radionuclides have been identified as most relevant because of volatility and radiotoxicity: {sup 137}Cs, {sup 90}Sr, {sup 110m}Ag, {sup 131}I. With the code PANAMA the fraction of failed coated fuel particles has been calculated. The diffusion of the fission products to the fuel element outer surface has been calculated with the FRESCO code. Transport and deposition of the fission products within the primary system has been analysed with the code MELCOR. Under normal operating conditions the release rate of the short-lived {sup 131}I reaches a constant level rather quickly, contrary to the longer lived {sup 137}Cs and {sup 90}Sr which show a steady increase of the release rate during burn-up. Under incident conditions the retention capability of the fuel elements' graphite is strongly reduced. The release from the intact coated particles remains negligible compared to the release from the defect coated particles. After a ten year operation period, the total activity of the released nuclides in the primary system is about 58 GBq. The highest activity is found in the pre-cooler. Other components with high activities are the recuperator and the compressor. These components are contaminated mainly by {sup 110m}Ag. The gas ducts in the energy conversion unit are contaminated by {sup 110m}Ag and {sup 131}I. Contamination as a consequence of incident conditions is difficult to estimate, because it depends on a number of phenomena. Under the assumption that 10 fuel elements are damaged, the activity is about 44 GBq. (author)" @default.
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- W3179295355 date "2001-08-01" @default.
- W3179295355 modified "2023-09-24" @default.
- W3179295355 title "Fission product transport in the primary system of a pebble bed high temperature reactor with direct cycle" @default.
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