DE1079228B - Arrangement for loosening and connecting a contaminated component - Google Patents

Description

GERMAN

The invention relates to an arrangement for releasing and connecting, in particular for replacing one Component in a closed apparatus, e.g. B. in a reactor. Both for repair ζ wake up and Components, for example pumps or heat exchangers, often have to be rolled into one for retrofitting radioactive cycle, expanded or re-deployed without the use of harmful substances or Rays can only escape in traces. The connections should be completely tight and closures as simple and robust as possible, d. H. with the lowest possible susceptibility to failure and large Lifetime are designed because they are cumbersome and difficult to access, the repair mostly 'Is expensive and the operation of the system should be interrupted as little as possible. All operations in Contaminated rooms must of course be remotely controlled in a suitable manner.

Tight pipe connections are known per se, in particular those that are flattened by pressing against one another Flanges are made by tightening bolts. Tight closures are often called Slide, blind flange or the like. Executed. In addition, devices are already known to z. B. from in Taking samples from plants in operation in which chemical reactions take place under pressure, by transferring a corresponding sample vessel in and out. These known devices however, generally do not meet the requirements that z. B. are to be provided in a reactor. If long-life components are to be replaced in a system for chemical reactions, then they are usually put out of operation beforehand and freed from any toxic reaction products. One Radioactive contamination, on the other hand, persists for a long time even when a reactor is shut down not so easily get rid of. The arrangement for replacing the components must always be absolute there be tight, since traces of escaping radioactive gases z. B. not just like poisonous gases can be eliminated in a chemical plant by an air conditioning system or the like. It is also constant Shielding against radioactive radiation must be observed, since the activity of the radiating substances mostly is very high.

According to the invention it is therefore proposed that a rotatable closure disk which is provided with at least one bore and which can be adjusted to a fixed opening of the apparatus or closes it can be pressed tightly together on the one hand with a counter flange of the apparatus and on the other hand detachable from the counter flange while maintaining the seal to allow rotation is connected and that a radiation-safe, tightly closable transport bell for arrangement for loosening and connecting
of a contaminated component

Applicant:

Brown, Boveri & Qe. Aktiengesellschaft, Mannheim-Käfertal, Boveristr. 22

and holding and patent management company
with limited liability,
Essen, Altendorf er Str. 103

Dr. rer. nat. Rudolf Schulten, Mannheim,
Dipl.-Ing. Andreas Setzwein, Neuhermsheim,

and Helmuth Braun, Rülzheim,
have been named as inventors

the removal and delivery of the component to be replaced is provided, which is carried out by the rotatable Closing disc tightly closable opening in the ceiling of the attempted room can be placed in this way is that the contaminated space and the interior of the bell are always completely impervious to the exterior are completed, while the transport bell contains a hoist, with the help of which the component can be lifted off its base with the connections and placed with appropriate guides.

The invention thus consists of the combination of several features, some of which are known. It It has been found that a rotary closure disc according to the invention over the other possible Closures still have the longest service life and work most reliably, as do the flanges. The latter are also necessary so that the connection is made when the pane is lifted loosened a few millimeters and this becomes movable. When it is raised by a few millimeters, it remains the volume into which the contents can leak from the separate openings is small. To maintain Due to the special tightness during lifting and turning, further means must be provided

909 769/447

be, for example, a ring channel with a passive one Barrier fluid, in which an annular extension of the closure disc is immersed, the pressure difference between inside and outside a corresponding column of liquid carries, as is the case with the movable one Seal of a gasometer is known. Mind you, this liquid seal is only used during the Turning process used; the fixed flanges pressed together are more reliable for permanent shut-off; in addition, larger pressure differences usually occur during operation.

Preferred embodiments are explained with reference to the figures.

Fig. 1 shows part of a reactor in which components are replaced with corresponding devices can be;

FIG. 2 is an enlarged detail from FIG. 1, which is identified there with a dot-dash circle is;

Fig. 3 is an embodiment of a rotatable closure disc inside a contaminated reactor room, and

Fig. 4 shows the arrangement of several rotatable sealing disks in the ceiling of the contaminated reactor room ;

Figs. 5 and 6 show arrangements inside a rotatable sealing disk for tight pressing of flanges.

In the figures, 1 means, inter alia, a closed off from all other rooms of the reactor, gas-tight vessel in the shape of a flat circular cylinder, 2 a rotatable closure disc in the Ceiling of the contaminated room, 3 a gas- and radiation-tight protective bell for removal and delivery to be replaced components, 4 a preferably liquid-filled (contaminated) space between the Components, 5 gas-filled (contaminated) rooms that contain the individual components of the reactor circuit, 6 circular cylindrical smooth steel walls, which seal off the rooms 5 against the room 4, and 7 a replaceable component, e.g. B. a pump, a heat exchanger, a pipe section or the like.

In the overall overview of FIG. 1 is the use of rotary locking discs 2, 14, 28 according to the invention to be recognized three times. Should z. B. a Component 7 are exchanged, the mobile transport bell 3 is initially closed Rotary locking disk 2 placed in the ceiling 20 of the contaminated room 4. Expediently one forms the Transport bell on wheels 29 and rails (embedded in ceiling 20 and disc 2 and in the drawing not visible), but transfers its weight when it is placed on the pane 2 Fold up the wheels 29 on a soft iron seal 11 to form a gas and radiation-proof closure of the contaminated rooms to be opened in relation to an outside room 19. Of the Pressure on the seal 11 can, if necessary, still od by tightening the appropriate screw bolts. increase. Instead of soft iron, other soft metal can also be used for sealing.

After the tight fitting of the transport bell 3, after the tightness by not shown Means has possibly been checked again, a slide 41 in the bell 3 can be opened. At the same time, the rotary closure disc 2 of its soft metal seal 13 z. B. by one several annularly arranged individual pistons and cylinders existing hydraulic jack 50 lifted. The load of the disc 2 with the bell 3 standing on it is thereby transferred from the seal 13 to the Roller bearing 22 relocated. The tightness to the outside is then only possible through a passive barrier fluid 21 given. The disc 2 is now by a corresponding, on the edge teeth 51 of the Disk 2 acting drive (is not in the plane of the drawing and is therefore not recognizable) for so long twisted until a hole 43 in the disc 2 with the cylinder space 5, which is used as a hole through the fixed

ίο ceiling 20 goes through, closes flush. Then it will be the disc 2 is placed back on its seals 13 and the component 7 can by a corresponding remote-controlled hoist 52 lifted out in the transport bell 3 (in the position shown in dashed lines) or used in the reverse process. When this process is finished, all steps will go back performed in reverse order, d. H. the turntable 2 is lifted off the seals 13 and rotated until the space 5 is closed, then placed back on the seals 13, the slide 41 pushed forward again, the tightness checked again and radioactive residual gases between the slide 41 and turntable 2 eliminated, the transport bell 3 lifted from the seal 11 and transported away.

The turntable 2 is expediently on the mating flange or the seals 13 in both places by suitable means, e.g. B. Bolt, pressed on.

The component 7 in turn rests on the rotary closure disk 14 inside the contaminated room and is gas- and liquid-tight via this Pipelines 17 connected by radioactive cycles. Depending on the type of circulation, it can be up the rotary shutter disk 14 attached and its connections on this side tightly with the openings of the Disc 14 be connected. Should the rotary closure disk 14 together with the component 7 or after Removing the same can be used to hold back the highly active circulatory content

4.0 in the contaminated rooms it should be appropriate that the Disc 14 itself is designed as a tightly closing, pull-up piston in the steel cylinder 6.

Instead of a complicated component 7, e.g. B. a pump set, heat exchanger or the like. A simple pipe connection 16 can also be placed on a rotary closure disk 28 in the interior of the contaminated space which is completely identical to the disk 14. This pipe connection 16 can either be introduced as an inserted connection part for the optional exchange with a more complicated component 7, or it can, without being exchangeable for other types of components, fulfill a different purpose in that it, together with the rotary closure disk, is in the manner of a multi-way valve for optional connection or Separating permanently installed, preferably cast in concrete 18 connecting pipes 17 is used. Conversely, the rotary lock washer 14 can also be used to solve more complicated components 7 not only for the purpose of removing from the connections, but also to connect them in the manner of a multi-way tap either with several permanently installed connection pipes 17 or to separate them from them; ie the closure disc acts as a switching device.

Instead of inside a contaminated room 4, a component 7 can also be placed on the ceiling 20 of a contaminated room And be connected to it by appropriate fixed pipelines, if the Dr eh closure disc is designed so that even when the component is removed, contamination of the

Space 19 is omitted, and if the component is provided with a radiation-proof enclosure that remains firmly connected to this as long as the component 7 is in non-contaminated rooms. The radiation-safe covering can also be used as a transport bell similar to bell 3 be formed, which stands on the rotary closure disc 2 and remains there with the component from the but the component again after being transported away

on the flanges 26 of the disc 14 is generated by inflating the shaft tube compensator 10, the at the same time to absorb small mechanical deformations and thermal changes in length in the 5 location is. When the corrugated tube compensator is not inflated, the weight of the component 7 rests on stops 46. In addition, the pipes are expediently made of hard material and for sealing just a thin one on the flanges

can be solved. (In any case, it is advantageous to use a soft metal layer, preferably a soft iron Train the transport bell in such a way that it is inserted.

wise for several interchangeable components of the case of correspondingly flexible connection tubes 53

Reactor is to be used.) Can also be connected to the corrugated tube compensator 10

Often components that have become damaged can be pulled. The pressure of the flanges can be are, because of their high radiation activity, can no longer be generated, for example, by repairing the interior so that it is only inflated to spaces 45 when the flanges are on are transported where there are no hazards from the wall 56 designed as a flexible membrane call forward. Nevertheless, this interior 45 must be located in such components. Even when in use the pipe connections 53 are still to be closed; this vessel wall 56 must be of a corrugated pipe 10 so that the leakage of highly active substances into the free ao behave like a flexible membrane, so that the Atmosphere is prevented. Closing the corrugated tube compensator 10 moves the flange 24 Pipe connections 53 of the components 7 happens in can and nevertheless the interior 45 is perfect In this case, it remains particularly simple, cheap and tightly sealed.

fully by connecting the connections 53 with a closure When pulling up the disc 14 in the steel cylinder 6

mass, ζ. B. be poured with concrete. There are 25 causes the seal 44 to close tightly. As soon then means for the appropriate introduction of the vaults this has passed the bulge 33, the loses closing compound in the connections before the final extension 12 makes contact with the liquid 15. Provide bringing out the component. Fig. 3 shows the rotary closure disc 14 in the

Furthermore, there can be the risk of the top view escaping. In the example shown, the disk has 14 highly active substances from the interior of the circuit 30, a total of four bores with sealing flanges 26 (Pipes 17 or components 7) into the interior of the component to be attached. With the one shown Transport bell 3 still reduce the fact that the position is removed and the component is fixed Pressure inside the transport bell 3 opposite built-in pipe connections 55 (shown in dashed lines) the pressure inside the circuit is increased. are locked. The large, rigidly held tooth

In Fig. 2 details of a rotary lock 35 wheel 9 allows the rotation of the disc 14 by disc 14 inside the contaminated space closer two motors via gears 34. In the operation of the recognizable. The connecting pipes 17 for the component reactor is the whole disk through a total are useful like all non-replaceable parts sixteen hydraulic drives via the stiffener Poured concrete 18. To connect or disconnect ribs 42 pressed onto the mating flanges 55. Besides solid, cast in concrete 18 connection pipe it 40 which are still the flanges 12 of the disc 14, the 17 with the component is the rotary lock washer barrier fluid 15 and the solid cylinder wall 6 before-14 by a hydraulic jack 30 by a few millimeters.

meter raised, then by a motor 8 on a form for rotary locking discs

Gears 34 and 9 rotated into the new position and in the ceiling of the contaminated room is shown in Fig. 4 Tightly lowered onto its base. 45 shows. Locks when the transport bell is removed The hydraulic jack 30 with the gear 9 is each disk 2 two through holes 57 (dashed line stationary, and the disc rests with her and the drawn) in the ceiling 20 of the contaminated room. Weight of the component 7 is now on the roller bearing 31. Should a component be attached or removed while The rotation becomes the perfect seal, so the transport bell is on the bore 43 activity only placed by the passive barrier liquid 15 5 ° of the disc 2 and the disc through the obtained that rotates the openings in an enclosing drive 23 until the bore 43 is Surrounding annular channel, in which an annular continuation with a correspondingly dashed throughput 12 of the closure disc 14 is immersed and thereby covers leadership.

causes the closure, while in the rest position Fig. 5 shows a preferred embodiment for

Flanges 24, 26; 54, 55 the tightness against 55 pressing of the flanges 54, 55 at the inner turning height Cause pressures. Closure disk 14. Here, the disk 14 and the pressure of the flanges 54 of the rotary closure component 7 are not in the axial direction of the disk 14 disk 14 on the counter flange 55, either the fixed or the pipe 17 slidable, but the flange built-in connection pipes 17 or in the separating 54 to the connection 17 rigidly cast in the concrete 18 position on permanently installed, not shown blind 60 on the side of the disc 14 can be moved by itself, flanges, is first of all due to the weight of the Basically you have several options,

the flanges 54, 55, 24, 26 separate and one on top of the other
to press. In the first example shown was the whole
Closing disk 14 from the counter flange 55 ζ. Β. by
65 a hydraulic jack 30 can be lifted off and pressed onto it. In this example, 55 and 55 can be pressed onto the closure disk 14 on the counter flanges
Flanges 54 which can be lifted off from these are provided. Conversely, it is also possible that the counter flange

Disk 14 and the component 7 resting entirely on it, can then then be passed through
Actuation of the hydraulic drive 35 still considerably
be reinforced.

Here, the lever 32 actuated by the drive 35 is supported on an abutment 36 in a
Bulge 33 in the cylinder 6 and transfers the
Pressure via a stiffening rib 42 on the disc

14. The pressure of the component connection flanges 24 70 55 movable, d. H. onto the sealing disc 14

can be pressed or lifted from this. The connecting pipes of the component 7 are expediently itself rigidly connected to this and the flanges only through a directly adjoining it, as Shaft tube 10 formed part movable. This part can also cause small mechanical deformations and absorb thermal changes in length.

To make the flange 54 movable on the one hand and on the other hand when the flange 54 is lifted off To keep space 59 small, into which the contents of the connecting pipes 17 can flow out, the movable ones Flanges attached to a membrane 49, which seals the space 58 in which the shaft tube compensator 10 is optionally located with a further pressure-controlled device 47. The membrane is flush with the rigid parts of the device.

If a flange is sufficiently pre-sealed, it is usually sufficient to control the internal pressure of an associated corrugated pipe expansion joint to increase and thereby press this flange and the tightness of the connection to enlarge. Simply by removing the internal pressure on the associated corrugated pipe expansion joint the flange can then be slid sideways and the rotary lock washer rotated.

To have one more degree of freedom for the contact pressure of the flanges 54, 55 and also the condition to be able to meet that the pressure in the transport bell be greater than in the circulatory system is to bring the corrugated tube or the corrugated tube compensator 10 into a closed off from all conventional spaces Vessel (either it is sufficient to use an enclosed space 58 or one uses an additional, overlaid vessel 47), its internal pressure or its pressure difference against the inside of the connecting pipe 17 alone determines the pressure of the flanges 54, 55. About this pressing to control, this closed vessel 47 is expediently provided with a separate supply line 48, through which it can be subjected to the overpressure or underpressure required for pressing. If you want to press several individual flanges on a rotary lock washer separately and individually can control what with several different types of connections of the component with different Pressures can be significant, so you can see for some of the connections, preferably for everyone a separate vessel with separate pressure or separate pressure control.

Large pressures on the flanges are particularly easy to generate when the closed vessel in turn a corrugated tube compensator 47, the internal pressure of which is essentially the pressure of the flanges 54, 55 determined.

In the example of FIG. 5, this is the large corrugated tube compensator 47 within the recess 58 in FIG the rotary lock washer 14j of the small one Corrugated tube compensator 10 is slipped over the implementation. The pressure with which the flanges are pressed together is essentially proportional to the diameter of the expansion joint and its Internal pressure. Since the shaft tube compensator 47 has a much larger diameter than the shaft tube compensator 10, the former essentially determines the contact pressure of the flanges 54th, 55th.

In the example given, only the contact pressure of the flanges 54, 55 is passed through to the fixed pipe connection 17 a shaft tube compensator 47 controlled, while the flanges 24, 26 from the side of the component 7 are firmly pressed on by other means. But it is just as possible to use the lead-through arrangement in to meet the rotary lock washer 14 so that the pressure of a shaft tube compensator at the same time acts on both sides and thus simultaneously presses on two flanges. In this case you hold the Corrugated tube compensator 47 is expediently fixed to the disk 14 on a rigid central part. Instead of one continuous corrugated tube compensator can also have two separate ones on both sides of this central part individually inflatable corrugated expansion joints are located.

Fig. 6 shows an example in which the flanges 26, 54 in the rotary shutter disc 14 individually and separately controllable on their counter flanges 55, 24 can be pressed and a displacement of other parts in the axial direction the disk 14 or the tube 17 is not required in order to be able to rotate the disk 14. Of the Internal pressure of the tube 17 supports the contact pressure as soon as it is increased by instead of one Wave tube compensator a lens 60 inflates. An inner tube 65 of the feedthrough through the disc 14 is so short that in any case it does not hinder the rotation of the disc 14; it has a fixed counterflange 55 always a few millimeters apart. The flange 54 is opposite the inner tube 65 in one tightly closing gland packing 63 movable in its axial direction. The flange 54 is on the Flange 55 pressed on when a lens 61 sealed off by the gland packing 63 is over a conduit 67 is inflated and the flanges 54, 55 allow the disk 14 to rotate when the Pressure is released from the lens 61. At the other end of the lead-through through the disc 14 in the case of component 7, the same principle can be applied quite independently; practice here inner tube 66, gland packing 64 and lens 62 with lead 68 on the flanges 24, 26 perform exactly the same functions like the corresponding parts on the opposite side.

Claims (26)

Claims 1. Arrangement for releasing and connecting, in particular for replacing a component in a closed apparatus, e.g. B. a nuclear reactor, characterized in that one with at least a hole provided, adjustable to a fixed opening of the apparatus or this closing rotatable closure disc on the one hand tightly compressible with a counter flange and on the other hand, while maintaining the seal to allow rotation of the mating flange is detachable and that a radiation-safe, tightly closable transport bell for the Removal and delivery of the component to be replaced is provided, which is based on the rotatable locking disc tightly lockable opening in the ceiling of the contaminated room can be placed in such a way that the contaminated space and the interior of the bell against the exterior is always completely sealed, while at the same time the transport bell Includes lifting gear, with the help of which the component can be lifted from its base with the connections and can be put on with appropriate guides. 2. Arrangement according to claim 1, characterized in that the closure disc from the counter flange, can preferably be lifted off by a hydraulic jack and pressed onto it. 3. Arrangement according to claim 1, characterized in that the counter flange on the closure disc can be pressed on or removed from it. 4. Arrangement according to claim 1, characterized in that on the closure disc on the Opposite flanges which can be pressed on and which can be lifted off from these flanges are provided. 5. Arrangement according to claims 1 to 4, characterized in that the compressible Flanges are located on a membrane and the corresponding connection pipes with an as Shaft tube formed part are provided, which is capable of small mechanical deformations and record thermal changes in length. 6. Arrangement according to claims 1 to 5, characterized in that at least a connection is a wave tube compensator, which by increasing its internal pressure Flange presses when it is sufficiently pre-sealed, and preferably when it cannot be lifted off Closure disc already by removing its internal pressure the rotation of the Disc permitted. 7. Arrangement according to claim 5 or 6, characterized in that the shaft tube or the The corrugated tube compensator is located on a vessel that is closed off from all other rooms, its internal pressure and / or its pressure difference against the interior of the connecting pipe alone Determine the pressure of the flanges. 8. Arrangement according to claim 7, characterized in that the closed vessel with a separate supply line is provided, through which it with the necessary for pressing over or Negative pressure can be applied. 9. Arrangement according to claim 7 or 8, characterized in that for some of the connections, preferably for each individual connection, a separate vessel with a separate pressure or separate pressure control is provided. 10. Arrangement according to claim 8 or 9, characterized in that the closed vessel is a Corrugated tube compensator, the internal pressure of which essentially determines the pressure on the flanges. 11. Arrangement according to claims 7 to 10, characterized in that the completed The vessel is located inside the correspondingly designed rotary closure disc and the Implementation is preferably held in a rigid central part so that the flanges can be pressed simultaneously on both sides of the disc. 12. Arrangement according to claims 1 to 11, characterized in that the closure washer and the mating flange in both positions by suitable means, e.g. B. Screw bolts, compressible are. 13. Arrangement according to claims 1 to 12, characterized in that to the perfect Sealing of the fixed opening when not compressed Flanging is a known fixed opening that is centric to the axis of rotation enclosing closure is provided in the form of an annular channel in which an annular Extension of the closure disc is immersed in a passive barrier liquid. 14. Arrangement according to claims 1 to 13, characterized in that the to be replaced Component via the rotary lock washer with gas- and liquid-pressure-tight pipelines, z. B. those of radioactive cycles, is connected in a reactor. 15. Arrangement according to claims 1 to 14, characterized in that the component on the rotary lock washer is attached and its connection on this side gas- and liquid-pressure-tight is connected to the opening of the disc. 16. The arrangement according to claim 15, characterized in that the rotary closure disc according to Type of multi-way tap for the optional connection or disconnection of a component and / or is formed by pipe connections with permanently installed connecting pipes. 17. Arrangement according to claims 1 to 16, characterized in that between the flanges for better sealing a soft metal layer, preferably a soft iron layer, is located. 18. Arrangement according to claim 1 or one of the following, characterized by the application the sealing disc as a closure of a contaminated one excluding harmful effects Space, in particular as a gas- and liquid-tight and radiation-proof closure of a radioactively contaminated reactor room, preferably in the ceiling of the room above an exchangeable one Component. 19. Arrangement according to claims 14 to 17, characterized in that the component with is provided with a radiation-proof envelope and together with the closure disc in an accessible, uncontaminated room and that means are provided to prevent the No radioactive substances or rays are lifted off the component from the sealing disc to let out. 20. The arrangement according to claim 19, characterized in that the radiation-safe envelope is designed as a transport bell, the disc with the shutter against the component Outer space closes and remains with the component on the pane, while the corresponding Means held therein component transported away with the bell and then from this can be solved. 21. Arrangement according to claim 19 or 20, characterized in that the transport bell or the component with the radiation-proof casing on wheels and preferably on Rails is mobile and that it or it when putting on with the main weight for Purpose of the seal rests on the seal. 22. The arrangement according to claim 20, characterized in that means are provided, the To increase pressure in the transport bell compared to the interior of the component. 23. Arrangement according to claim 14 or one of the following, characterized in that means are provided, the connections of the component to be removed before the final removal with a sealing compound, ζ. Β. Concrete, pour. 24. Arrangement according to claim 1 or one of the following, characterized in that all are not replaceable parts, especially the connecting pipes, of the reactor cast in concrete are. 25. Arrangement according to claim 20, characterized in that the transport bell is designed in such a way is that it can be used for several 909 769/447 Γ079 228 Replaceable components of the reactor can be used is. 26. Arrangement according to claims 14 to 17, characterized in that the rotary closure disc inside the radioactively contaminated room is in turn interchangeable by being tightly closing pull-up piston in a z. B. made of steel cylinder containing the replaceable component. Considered publications: German patent specifications No. 638 237, 704 740. For this purpose 2 sheets of drawings 909 769 / 44.7 3.60