DE2810593A1 - Biologically harmful radioactive waste disposal - by lowering mixing vessel through shaft into underground cavity - Google Patents

Abstract

Biologically harmful, esp. radioactive waste products are dumped through shafts in cavities in suitable geological formations. The waste is filled from a container inside a screened chamber into a mixing vessel, together with a hydraulic binder from a separate container. The mixing vessel is then lowered on a rope into a shaft until it reaches the cavity where a shutter is opened to discharge the contents. This saves the provision of lost packages or the laying of redundant pipelines. The waste need not be fluid enough for pumped transport.

Description

Process and device for the final disposal of bio-harmful waste

The present invention relates to a method and a Device for the final storage of bio-harmful, especially radioactive waste in an underground cavity.

Bio-harmful, especially radioactive waste is used to dispose of it first conditioned, then packaged and then stored in a repository.

Underground cavities are preferred for such repositories used in suitable geological formations. It is customary to take the waste to condition, d. h. To solidify, expensive z. T. in shielded containers to be packed and then with this lost packaging in the named To store cavities.

("To secure the final storage of radioactive waste in the salt mine ASSE ", Süddeutscher Verlag Munich, 3rd edition, as of January 1975; overview of the operational facilities and development work for the treatment and disposal of radioactive substances Waste in the nuclear research center in Karlsruhe ", KfK report 1455, August 1971.) Um to avoid the disadvantage of lost disposable packaging and also to reduce the void capacity To better utilize, the containerless disposal became through the introduction of pumpable mixtures of waste and hydraulic solidifying agents through pipes proposed directly into the underground cavity. The mixture solidifies in the process only in the cavity to a monolithic block (ATW magazine, issue 7, July 1966, pages 357 ff.) However, this method involves difficulties: - The pumpability of the waste-solidifying agent mixture must always be given, - The pipe string must be cleaned constantly, whereby that gets into the cavern Rinse water, in turn, tied with a binder must be - through the risk of pipe clogging by solid substances, which cannot be excluded or through premature hardening, there are redundancies in the delivery lines and also required for waste storage capacity before solidification.

Also the pipe conveying of solidified waste-containing granulate and of waste-containing crumbs in the underground cavity is proposed (ATW - aforementioned edition, also p. 357 ff.). The result of abrasion The resulting pipe wear makes a redundant design disadvantageous here as well necessary. Dust generation requires devices for dust separation. Of the Secondary waste generated in this way must also be disposed of.

It was therefore an object of the present invention to provide a method and a device for the final storage of bio-harmful, especially radioactive waste found in underground cavities by conditioning this waste in one against the environment shielded room by means of a mixer, being the one described above Disadvantages should be avoided, especially the use of lost packaging or the redundant design of delivery lines.

This object was achieved according to the invention in that the simultaneously Mixers designed as transport containers via a borehole into the underground Cavity is lowered and emptied there.

A device is advantageously used to carry out this method in the one provided with a closure member on the bottom, as a transport container trained mixer by means of a conveyor system for emptying via a borehole can be lowered into the underground cavity.

The method according to the invention and a advantageous device for carrying out this method schematically explained in more detail: above the shaft (1) of an underground cavity (2), which is in a suitable geological formation (3) are, in a known manner, the bio-harmful - For example radioactive - waste (4) and the hydraulic binder (5) mixed. The mixing process takes place in a container (6), which is equipped with a mixing device (7) is equipped, the container (6) designed as a reusable transport container is and by means of a conveyor system (8) through the shaft (1) into the cavity (2) can be drained. In a suitable position above the cavity floor or already solidified waste (9) becomes the waste-binder mixture, which is not necessarily pumpable (10) by opening a closure member (11), for example a slide or a flap, drained into the cavity (2). There the mixture solidifies into one solid block. After emptying, the container (6) is transported by the conveyor (8) brought to the starting position for refilling. After completing a Storage campaign, the container (6) can be cleaned by rinsing, wherein the rinsing solution does not have to get into the cavern but is pumped back into the template (4) can be.

The container (6) can be provided with mixing devices (7) as well can also be designed as a pure transport vessel.

In an incident - e.g. B. by premature setting of the mixture already in the container (6) - the container (6) can be discarded and replaced with a new one Container to be replaced.

Claims (2)

Process and device for the final disposal of bio-harmful waste Claims S Method for the final disposal of bio-harmful, in particular radioactive Waste in underground cavities by conditioning these waste in one Room shielded from the environment by means of a mixer, characterized in that that the mixer, which is also designed as a transport container, has a borehole is lowered into the underground cavity and emptied there. 2. Device for the final disposal of bio-harmful, especially radioactive Waste in underground cavities by conditioning these waste in one Room shielded from the environment by means of a mixer, characterized in that that the one on the bottom with a closure member (11), as a transport container trained mixer (6) by means of a conveyor system (8) for emptying via a borehole (1) can be lowered into the underground cavity (2).