Radioactive Wastes

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to be carried out with the same equipment: evaporation of the waste
solution mixed with the additives necesary for the production of borosilicate
glass, calcination and elaboration of the glass. These operations are carried
out in a metallic pot that is heated in an induction furnace. The vitrification
of one load of wastes comprises of the following stages. The first step is
'Feeding'. In this step the vitrification receives a constant flow of mixture of
wastes and of additives until it is 80% full of calcine. The feeding rate and
heating power are adjusted so that an aqueous phase of several litres is
permanently maintained at the surface of the pot. The second step is the
'Calcination and glass evaporation'. In this step when the pot is practically
full of calcine, the temperature is progressively increased up to 1100 to 1500 C
and then is maintained for several hours so to allow the glass to elaborate. The
third step is 'Glass casting'. The glass is cast in a special ...

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inertias, absence of volatile products and good radiation
resistance. The ruthenium that escapes is absorbed by a filter. The amount of
ruthenium likely to be released into the environment is minimal.
Another method that is being used today to get rid of radioactive waste
is the 'placement and self processing radioactive wastes in deep underground
cavities'. This is the disposing of toxic wastes by incorporating them into
molten silicate rock, with low permeability. By this method, liquid wastes are
injected into a deep underground cavity with mineral treatment and allowed to
self-boil. The resulting steam is processed at ground level and recycled in a
closed system. When ...

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