FI61364C - ANORDING FOR RADIOACTIVE PLASTIC FALL SPECIFIC JONBYTAR FILTERS SUBSTANCES - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken

Germany (DE) P 2531501 + .8 (71) Kraftwerk Union Aktiengesellschaft, Wiesenstrasse 35 »1 + 33 Mulheim (Ruhr), Federal Republic of Germany Förbundsrepubliken Germany (DE) (72) Anwer Puthawala, Erlangen, Lutz Hoffmann, Erlangen , Erlangen, Werner Hild, Hochstetten, Hans-Erich John, Leopoldshafen,

Wolfgang Kluger, Leopoldshafen, Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (7I +) Oy Kolster Ab (5I +) Apparatus for the recovery of radioactive plastic waste, in particular ion exchanger filter mass -

The invention relates to an apparatus for recovering radioactive plastic waste, in particular an ion exchanger filter mass, which is obtained mixed with water and which is dried before being immersed in a bituminous hardener and, together with it, filled into containers used for final storage.

Hitherto known devices (cf. German applications 14 64 476, 14 64 859, 21 65 510 and German Publications 15 89 839, 16 14 071) operate largely at relatively high temperatures. I did so because the bitumen needs to be kept as easy to run as possible. Secondly, during mixing with the bitumen, it is desired to carry out further drying in order to seal the radiant synthetic waste inside the bitumen. This tight seal is necessary because the risk of dissolution must be avoided when water penetrates the final storage sites. Now, however, high temperatures and the need for drying in most work steps are uneconomical; in addition, they may have undesirable consequences due to 2 61364 chemical changes. Therefore, the invention seeks to provide a device for removing radiant artificial waste, which device eliminates the above-mentioned disadvantages. At the same time, equipment costs must be kept low, as the costs that a nuclear power plant user is prepared to incur for such purposes are only very small.

The device according to the invention is characterized in that it has a container as a plastic waste collection container, that the container is made a ventilated drying container, that the container is connected after the dosing device, that the dosing device is connected to one end of the kneading mixer and

Accordingly, the drying of the artificial waste is carried out in a single place, in a collection tank, because the amounts of synthetic resin present in the nuclear power plant, especially those from ion exchange filters, are relatively small. Drying can then take a long time, so that energy consumption is low. Compared to the usual simultaneous simultaneous drying and setting at high temperatures, the following disadvantages are avoided:

The resins decomposed due to a chemical change and at the same time released gases (e.g. amines).

These gases were heavily polluted by the environment due to their penetrating odor and explosiveness.

Because the product formed from the resin and bitumen at a higher temperature was strongly foamed due to gas formation, it was not safe to fill the containers.

The application of wet resins was quite difficult and not safe to use due to lumping.

At a suitable time, the free-flowing, dried active ingredient waste can be fed via a dosing device to a kneading mixer, i.e. a kneader. Such a mixer mostly exists in cooling water treatment plants, e.g. for concentrate treatment. It is used in the invention from time to time to remove artificial waste. However, a special mixer may be provided for this purpose.

As already mentioned, the equipment costs are advantageously low in the invention. The essential component is a container, which is preferably 3 61364 made as a ventilated drying container and provided at its lower end with a dosing device. This can be connected by a downcomer to one end of a horizontal mixer, at the other end of which a barrel filling station is arranged. In this arrangement, the transport of the resin after drying takes place practically by gravity, provided that the movement of the mixer screw, which is obviously necessary for mixing, does not cause vertical movement in the mixer. The resins are led as a slurry to a drying tank, for which purpose there are already, of course, pumps of suitable size.

The function of the dosing device is to direct the feed to the mixer in order to maintain the desired mixture ratio with the required accuracy, e.g. 1: 1. A cell wheel lock can be used for this. However, other dispensing devices can be considered for this work.

It is generally advantageous if the mixer has a multi-chamber housing, the chambers of which can be steam-heated in parallel. This makes it possible to fine-tune the temperature in the mixer so that the thermal load of the resins poured into the bitumen can be kept as low as possible. On the other hand, the temperature then remains as close as possible to the maximum values allowed for processing, so that the viscosity of the bitumen is not too low.

In order to explain the invention in more detail, an embodiment illustrated in the piping design drawing with ordinary symbols will now be described with reference to the drawing. This piping design drawing comprises, in addition to the radiant waste removal device according to the invention, components for treating the concentrate of the pressurized water reactor coolant treatment system. This is due to the fact that the invention can be advantageously combined with a concentrate treatment plant, since in this way the costs of removing the radiating active ingredients according to the invention can be kept particularly low.

The figure shows a container marked with the number 1, which acts as a resin collection and drying container. In this tank 1, the radioactive resin coming from the rinsing of the ion exchange filters is collected, which is fed into the tank together with the rinsing water. Inside the tank, in its conical lower part 2, a grate 3 is seen, which enables the tank to be ventilated by a heating atmosphere 7. This circuit comprises a gas scrubber with boards, a redundantly arranged fan 7 with water separators and a heat exchanger 8.

Below the drying tank 1, a cell wheel shutter 10 is connected by means of shut-off valves, which opens into a vertical downcomer 11. The downcomer 11 leads to a kneading mixer track 12 comprising three stages 12a, 12b, 12c. The mixer 12 is placed horizontally, as shown in the figure. Its other end 14 is a feed end. It is also fitted with a drive shaft 15 for driving screws (not shown). The agitator shaft is driven by a motor 18 via a derailleur 16 and a clutch 17.

A filling station 20 is arranged at the other end 13 of the mixer 12. It shows barrels 21 which are conveyed by a scale 23. A suction 25 is provided for the filling station, which is connected via a exhaust air filter 26 to a line 24 terminating in a heater.

For the three stages of the mixer 12, gas hoods 27, 28 and 29 are provided, which are similar in structure. Gas hoods allow gases generated or released during kneading mixing to escape through lines 30, which can also lead to filters and heaters.

Adjacent to the mixer 12 are thickly drawn steam lines which, with their six parallel connected branch lines 32, 33, 34, 35, 36 and 37, allow a fine local adjustment of the temperature during mixing so that the temperature does not exceed 110 ° C at any point under the operating conditions. Appropriate thermostats 40 control either steam supply or condensate removal by means of suitable valves. The condensate drain lines lead to a common discharge 41. The steam input is marked with the number 42.

The bitumen required to cover the resin comes from a bitumen tank 45, which, like the line 46 leading to the mixer and its bitumen chips 47, can be heated by a steam line 48. At the same time, the bitumen pump takes care of the required bitumen ratio 1: 1. Higher temperatures, e.g. 140 ° C, can be maintained in the bitumen tank 45 and line 46 to preferably maintain a higher viscosity and to heat the resin cooled in the cell wheel seal 10 and downcomer 11 to the desired 110 ° C immediately upon mixing.

Tank 50 acts as an intermediate tank for concentrate. It receives a concentrate of radiant waste from the purification of cooling water, which is obtained, for example, in an evaporation process. Concentrate can

Claims (3)

5 61364 can be fed from the tank 50 via the dosing pump 51 and the line 52 to the inlet end 14 of the mixer 12, so that the immersion of the radiating active ingredients in the bitumen according to the invention does not require its own mixer. An apparatus for recovering radioactive plastic waste, in particular an ion exchanger filter mass, which is obtained mixed with water and dried before being immersed in a bituminous hardener and filled together with containers used for final storage, characterized in that it contains a container (1) for plastic waste. as a collecting tank, that the tank (1) is made as a ventilated drying tank, that the tank (1) is connected after the dosing device (10), that the dosing device (10) is connected to the other end (14) of the kneading mixer (12) and (12) a filling station (20) is arranged at one end (13). Device according to Claim 1, characterized in that the dosing device (10) is a closure which is made as a honeycomb closure. Device according to Claim 1 or 2, characterized in that the kneading mixer (12) has a multi-chamber housing, the chambers (12a, 12b and 12c) of which can be heated in parallel by steam.