DD286997A5 - DEVICE FOR RECEIVING ACTIVATED PROCESSING BACKPACKS IN THE REACTOR PRESSURE FAILURE - Google Patents

Abstract

The invention relates to a device for collecting activated Bearbeitungsrueckstaenden in Reaktordruckgefaesz. It is used to dispose of activated processing residues (grinding dust), during maintenance work, for example. B. loops, Schweiszen u. a. The aim and task is to capture and dispose of the processing residues arising during processing, regardless of the processing method in the reactor pressure vessel at the point of origin. This is done by a collecting screen, which is inserted into the water-filled reactor pressure vessel by means of a hall crane. It is extended against the reactor pressure vessel inner wall. Air hoses ensure the seal. A maximum disposal rate of 99% is possible. {Collection; Disposal; activated processing resets; Sanding dust; Reaktordruckgefaesz; Maintenance; SNF; Reaktordruckgefaeszinnenwand; Air hoses; Seal; Disposal degree}

Description

Field of application of the invention

The invention relates to a device for collecting activated processing residues in the reactor pressure vessel, in particular for the disposal of grinding dust when Ausschleifewn of Oberflächenungänzen. The use of the device causes the maximum disposal of emerging activated processing residues in maintenance work in the reactor pressure vessel.

Characteristic of the known state of the art

In DE-AS 2318426 a suction device is described on a working with a rotating grinding wheel grinding machine. This suction device is equipped with one of the grinding wheel adapted and the grinding wheel laterally cross-cap, which is divided into a rotating with the grinding wheel and adapted in shape and a fixed to the housing of the grinding machine part equipped. Both parts of the hood are sealed against each other by a labyrinth seal. For disposal of activated grinding dust when grinding Oberflächenungänzen of pressurized components of a nuclear reactor, this suction device for radiation protection reasons is not applicable.

Furthermore, from DE-OS 2517479 a device for the removal of potentially harmful manufacturing residues or the like, such as metal shavings, during the operation prior to testing from a nuclear reactor known.

This device relates to the removal of metal shavings, metal chips and other solid metal parts resulting from the manufacture of the reactor parts and the construction of the reactor, during machining, welding and assembly work.

This device is not suitable for regular revisions after commissioning on a nuclear reactor.

Both devices have the following disadvantages:

- no use in different grinding processes

- no application for different environmental conditions

- low level of disposal

- low radiation protection suitability.

Object of the invention

The object of the invention is to detect and dispose of the processing residues arising during processing (grinding, welding and the like) independently of the process in the reactor pressure vessel at the place of origin.

Explanation of the essence of the invention

The invention has for its object to dispose of the resulting processing residues to the host tool / plant surface in the reactor pressure vessel for reasons of keeping the plant clean.

According to the invention, the object is achieved in that the device is introduced by means of ceiling crane in the folded state in the previously opened and freed of fuel cartridges and filled with water reactor pressure vessel. The device consists of a provided with an upper and lower limit switch tube rod, are arranged on the spring with a sliding rings, wherein the one slide ring with locking rods and the other are connected to guide rods. These guide rods are in turn coupled with linkage rods, on which a collecting screen for the processing residues is attached. The collecting screen is provided with non-return flaps for opening the collecting screen and, moreover, equipped with air hoses for stabilization and sealing to the reactor pressure vessel wall. In the bottom ring of the collecting screen, filter packages are arranged in the middle, which retain the activated processing residues when the device is withdrawn from the reactor pressure vessel.

The invention will be explained in more detail with reference to the drawings shown in an embodiment. This embodiment relates to a machining process on the inner wall of a reactor pressure vessel. Show it

Fig. 1: Device In the folded state Fig. 2: Device in the unfolded state Fig. 3: Working positions of the device.

The entire device is introduced to catch the activated processing residues in the folded state by means of overhead crane in the previously opened and freed of fuel cartridges and filled with water reactor pressure vessel and dropped to the desired working height (Figure 3, position A). This device is structured as follows:

In the pipe string (1) are the compressed air line (3), the electric line (5) and the dome (6) with the wire (21). D jr catch screen Attached to a pipe string, continue to be the upper limit switch (2) and the lower limit switch (11) located in the pipe string. On the pipe string (1) move the sliding rings (17,18), which are connected to a spring (7). On the sliding rings (17,18) in the hinges movable locking rods (8) and guide rods (9) are attached. These are connected to the hinge rods (10). In the bottom ring (22) are the interchangeable filter packs (12) and the load hook (13) for receiving an additional load. At the lower end of the pipe string (1) an air distribution valve (14) is present. The collecting screen (20) is attached to the articulated rods (10). In him air hoses (15) are incorporated. In Auffangschirm (20) are various check valves (16). The collecting screen (20) consists of a water-repellent, load-bearing, radioactivity-resistant, plastic-like material.

An electric impulse activates the upper limit switch (2), which releases the upper lock. Driven by a motor, which is connected to the rope (4), the slip rings (17,18) are pulled down slowly on the pipe string (1). The device is unfolded. The check valves (16) ensure that the water can be freely distributed above the collecting screen (20). The process is finished at the lower limit switch (11). The sliding ring engages. Due to the possible vertical adjustment of the limit switch (11), the opening angle can be adapted to the inner diameter. The spring (7) ensures that you! jre locking the collecting screen (20) and guarantees an elastic bulge of the collecting screen when blowing the compressed air into the air hoses (15) via the air distribution valve (14) and the air supply (19). The collecting screen (20) is pressed against the inner wall of the reactor pressure vessel. It comes to sealing above and below the collecting screen (20). In this unfolded state of the collecting screen (20), the processing of the inner wall of the reactor pressure vessel can take place, and the processing residues settle only on the collecting screen (20).

Nacho.im have the Rearbeitungsrückstände discontinued, the device can be lifted (Figure 3, position B). The reactor contents water flows through the filter packs. The collection screen slides slowly upwards on the air hoses, while the collection of machining residues is supported by the angular position of the collecting screen Another lifting option is shown in Figure 3, position C. The automatic system slowly collapses the collecting screen (20) In a desired angular position, the catching screen (20) is again locked in. The processing residues lying on the outer edge of the catching screen (20) slide in the direction of the filter packs (12).

Claims (1)

Device for collecting activated processing residues in the reactor pressure vessel, characterized in that the device is equipped with a pipe rod (1) equipped with upper and lower limit switches (2, 11) on which sliding rings (17, 18) are arranged with a spring (7) , comprising, on the sliding ring (17) guide rods (9) which are connected to link rods (10) are mounted; and that on the hinge rods (10) a collecting screen (20) is mounted, which has check valves (16) for opening the Auffangschirmes (20) and in addition with air hoses (15) for Stabilisk tion and sealing equipped to the Reaktordruckgefäßwandung and centered in its bottom ring (22) contains filter packs (12) which retain the activated processing residues when the apparatus is withdrawn from the reactor pressure vessel. For this 3 pages drawings