Titlebook: Denitration of Radioactive Liquid Waste; L. Cecille,S. Halaszovich Book 1986 ECSC, EEC, EAEC, Brussels and Luxembourg 1986 Precipitation.f

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Reduction of Ru and Tc Volatility during Vitrification of HLLW by Denitrationrmation of oxidized compounds of certain elements. These include ruthenium and technetium with the volatile oxides RuO. and TC.O. corresponding to a high degree of oxidation. In addition to selective traps, various methods are available for limiting this volatilization to reduce the radioactive and

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Conclusions and Opinion of the Scientific Secretariesg temperature or vice-versa. Although sugar and ethanolhave been proposed as alternatives, their respective advantages over formic acid and formaldehyde (lower cost for sugar and better efficiency for ethanol) do not appear, in most cases high enough to counteract their inherent drawbacks (longer re

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Book 1986 by chemical means in the course of solidification of MAW (medium active waste) and HAW (highly active waste), prior to feeding the calciner or melter. In particular, differences In the volatility of some components and aerosol formation during the vitrification step are of interest. Chemical rather

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Industrial Application of Denitration of HLLW by Means of HCHOThe industrial experience has been gained for nearly 30 years in three reprocessing plants. The safety of the chemical process reaches very high standard thanks to the appropriated operating mode and efficient process control. Only very few incidents have been recorded. No alternative to this process is envisaged today.

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Bistatic Synthetic Aperture Radarto consideration the following operational parameters: the catalyst bed temperature; the gas residence time; the vapour concentration; the NOx concentration; the gas velocity; the catalyst grain size distribution; the catalyst time-life. The best operational conditions have been selected for obtaining abatement yields of the order of 99.5%.

Evocative

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Abatement of the NOx Evolved during Denitration of Reprocessing Concentrateto consideration the following operational parameters: the catalyst bed temperature; the gas residence time; the vapour concentration; the NOx concentration; the gas velocity; the catalyst grain size distribution; the catalyst time-life. The best operational conditions have been selected for obtaining abatement yields of the order of 99.5%.

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Conclusions and Opinion of the Scientific Secretaries high level waste during vitrification (in the rotary kiln according to the AVM process) which enables a significant reduction of Ru and Tc volatilities. However, for all the other applications, so far, formic acid and formaldehyde remain the most suitable reagents for denitrating adioactive liquid waste.

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