WO2010066621A1

WO2010066621A1 - Arrangement for transporting a radioactive object

Info

Publication number: WO2010066621A1
Application number: PCT/EP2009/066260
Authority: WO
Inventors: Franz Hilbert
Original assignee: Nuclear Cargo + Service Gmbh
Priority date: 2008-12-08
Filing date: 2009-12-02
Publication date: 2010-06-17
Also published as: DE102008055492A1

Abstract

The invention relates to an arrangement for transporting a radioactive object (11) of large mass and large dimensions, comprising a supporting structure (10), which holds the object and which has connecting means (34, 36) for a transport vehicle (20). In order to be able to transport radioactive objects that require an additional shield to comply with required dose rate limits without problems, it is proposed that the supporting structure (10) comprise a frame having longitudinal frame members that clamp a straight prism-shaped body on the circumferential side and that have two lower first longitudinal frame members (16, 18) and two upper second longitudinal frame members (12, 14), that the first frame members be connected among each other and the second frame members be connected among each other through transverse members (48, 50, 52, 54, 56), between which the object can be positioned in a form-closed manner in some sections, and that the first longitudinal frame members comprise mountings at the ends thereof and the second frame members comprise abutment surfaces at the ends thereof for support arms (26, 28) of a Schnabel car (20) as the transport vehicle.

Description

Arrangement for transporting a radioactive object

The invention relates to an arrangement for transporting a radioactive article of large mass and large dimensions, in particular cylindrical container such as reactor pressure vessel or steam generator, comprising a container receiving support structure with connecting means for a transport vehicle. Also, the invention relates to a transport arrangement for transporting a particular radioactive article of large mass, such as at least 400 t or more, and large dimensions, such as at least 3 mx 3 mx 8 m or more, in particular reactor pressure vessel or steam generator, comprising a support structure receiving the article and a transport vehicle which is connected via connecting means with the support structure.

When transporting irradiated articles with very large masses and dimensions, in particular activated and contaminated reactor pressure vessels from nuclear power plants, the following problems must be solved simultaneously.

- The requirements for a large IP-2 package in accordance with TS-R-I must be adhered to as far as possible.

- It is extremely heavy loads of about 500 Mg (tons) to transport. The parts have very large dimensions, the width and height z. B. 4 m and in length may be 10 m or more. - As a rule, the transports are carried out in the combined transport on waterways, road and rail and possibly coastal waters due to the long transport routes.

The requirements for a Type IP-2 package are defined in TS-RI Regulations for the Safe Transport of Radioactive Material, IAEA, Vienna, which form the basis for all international and national regulations for the transport of radioactive material IP-2 package defined radioactive material protection objectives and, with a rise in the highest dose rate on the surface of the package, a drop test from a height of 0.3 m to an unyielding foundation.

In the case of transport under routine conditions of carriage, the dose-rate limits specified in the above provision are on the surface of the package, on the surface of the vehicle / wagon and at a distance of 2 m from the vertical surfaces formed by the external surfaces of the vehicle / wagon to comply. Under normal conditions of carriage, u. a. are defined by the above drop test, only conditions for the dose rate limit on the surface of the package are defined. For the dose rate limit values on the surface of the vehicle / car and at a distance of 2 m from the vertical surfaces formed by the outer surfaces of the vehicle / car, there are no limit values in this case.

Large and heavy, contaminated and activated items, such as steam generators or reactor pressure vessels, are transported as a Type IP-2 package. These items, due to their operational design, have large reserves in terms of mechanical stresses. Local weak points or openings such as nozzles and lid opening must be closed in a suitable manner. This as well as the proof of the properties by means of z. B. Finite element calculations is state of the art. According to the prior art, the objects are equipped with external additional shields, so that the above-mentioned dose rate limits are met.

Usually, such items are transported overhead on heavy duty vehicles. However, this form of transport is only possible if the heavy goods vehicle with load complies with the requirements regarding the permissible axle loads and maximum dimensions from the road transport with reference to the route to be traveled. In this respect, both the masses and the maximum dimensions of the part to be transported are limited.

Very heavy, non-radioactive objects can be transported by means of carrying buggies. For this purpose, the objects are equipped, in particular for very large widths, for example, transformers for power plants, with underlying tabs and overhead pressure surfaces for inclusion in the carrying beaks. These buggies can have up to a total of 32 axles in two units.

The weight of the objects is taken up and set down with the hydraulic devices of the carrying buggies. During transport for passage under bridges, a lowering or crossing of obstacles, such as traffic islands, an increase can take place.

DE-A-23 59 114 relates to a transport device for radioactive material, wherein a radioactive material receiving transport container is enclosed in a double-walled protective container. In order to provide a stacking possibility, spaced apart from the end regions of the protective container, vertical carriers are attached.

The subject matter of DE-A-2 231 621 is a transport arrangement with which a transformer tank having a top and a bottom belt is transported with a carrier bogie. From the upper and lower chords go recordings or stop surfaces for the carrier bogie. DE-UI 897 996 relates to a boiler for large transformers, wherein a support structure is provided which comprises upper and lower Längstraggurte. From these go out bearers, which are intended as attachment for support tabs for hanging on a beak car.

A lattice box for large transformers is described in DE-C-737 992. Bottom straps have lifting eyes to allow attachment to a bogie carriage. The transformer itself towers over the grid box.

By means of a bogie a transport carriage for large transformers according to DE-C-400 826 is transported. Lattice girders emanating from a bogie from the trolley are bolted to a container receiving the transformer.

A similar construction can be found in CH-B-100 844. This also involves a screwing of the transformer receiving stiffeners with extension pieces that lead to bogies.

For transporting a boiler, according to US-A-3,744,434 there is provided a beak transporting carriage comprising lower and upper belts which span a prismatic body. In this case go from bottom straps cross member, on which the container is supported.

The present invention has the object, an arrangement and a transport arrangement of the type mentioned in such a way that easily radioactive objects with very large dimensions, such as at least 3 mx 3 mx 8 m or more, and very large masses of z. B. at least 400 t or more, can be transported, which may require additional shielding to comply with required dose rate limits. At the same time the possibility should be given to use routes that would not be possible with the use of heavy vehicles on which the object is placed. In order to achieve the object, the invention essentially provides that the support structure comprises a frame with longitudinal frame legs spanning a straight prism-shaped body with two lower first longitudinal frame legs and two upper second longitudinal frame legs, that the first longitudinal frame legs are interconnected and the second longitudinal frame legs are interconnected via transverse legs between which the article is partially positively positioned, that the first longitudinal frame leg end receptacles and the second longitudinal frame legs end abutment surfaces for support arms of a trolley as the transport vehicle, and that the support structure consists of a lower and an upper part, the lower part of the first Longitudinal leg and the transverse leg connecting them comprises and the upper part of the support structure, the second longitudinal frame legs and connecting them cross leg and from the longitudinal frame tween an outgoing shielding comprise, which are connectable to the lower part of the support structure.

In particular, it is provided that the straight prism-shaped body has a rectangular, cuboid or trapezoidal shape in cross section. Preferably, the support structure comprises a frame with four circumferentially one cuboid spanning longitudinal frame legs.

Positively positionable means that the transverse legs follow at least in sections on their area facing the object of the peripheral geometry of the article, so that it comes into contact with the cross member in a planar or at least line or strip shape. If the object has a cylindrical shape, the cylinder support section follows correspondingly to the bearing area of the crossbeam. The object is thus fixed in a form-fitting manner between the upper and lower transverse limbs.

Consequently, it is provided that the transverse legs on the object side for the positive fixing of the article from the cut follow its outer geometry. According to the invention, an article of large mass and dimension, in particular activated and contaminated reactor pressure vessel from nuclear power plants, which may have internal internals and / or an inner filling with concrete, positioned in a support structure, which in turn is designed such that a connection with the support arms of a supporting bogie he follows. Thus, there is the possibility of raising or lowering the object to the required extent via the hydraulics of the carrier bogie, so that bridges can pass or obstacles can be traversed.

In particular, it is provided that the support structure consists of an upper part and a lower part, which are composable and connectable. This can be done by welding, bolting or bolting. The bipartite offers the advantage that z. B. on a site a transport of the object takes place exclusively on the lower part, which consists of the first longitudinal frame legs and connecting them transverse legs. If a transport then takes place outside a company premises, the upper part is as it were put over the object and then connected to the lower part. Therefore, the upper part also preferably has in section a U-shaped geometry, wherein the side legs are in particular formed by shielding plates, which are connected to the first longitudinal frame legs. This is readily possible because the corresponding shielding plates have thicknesses of preferably of the order of 10 mm to 120 mm, in particular in the range of 100 mm.

The support structure with respect to the longitudinal frame legs is further configured such that within the cuboid spanned by longitudinal frame legs of the object runs completely, so this projecting neither laterally nor frontally.

In a further development of the invention, it is provided that depending on the dose rate limit values to be observed, shields can be inserted between and connected to the longitudinal frame legs. This is an individual adaptation to the circumstances with respect to the observed Dose rates of the object to be transported possible. Corresponding shields should also be provided on the front side.

Preferably, the article is a reactor pressure vessel, wherein the longitudinal frame legs may consist of thick-walled tubes. However, this does not limit the teaching of the invention. Rather, longitudinal frame legs can also consist of double T-beams or square profiles. Generally speaking, the longitudinal frame leg should have a shape adapted to the object to be transported.

The required to comply with the dose rate limits shield can be replaced by plates z. B. steel of a thickness between 10 mm and 120 mm are generated, which are arranged between the longitudinal frame legs and z. B. be fitted snugly against the object to be shielded. Due to the separation of support structure and shielding is an optimized arrangement of the shield, d. H. thick and thus strong shielding in areas of high dose rate and no or thin and thus weak shielding in the area with low dose rate and thus associated weight reduction possible.

In particular, it is provided that the shield is made stronger in the lateral area, since in this area both the dose rate limit on the outer surface of the transport vehicle and the factor 20 lower value in 2 m distance from the outer surface of the transport vehicle, the case of very large objects determining the shielding, must be complied with. At the top and bottom of the vehicle, ie in the planes defined by the first and second longitudinal frame legs, the shield can be reduced in weight in accordance with the regulations.

The support structure according to the invention and the preferably suspended in this shield performs a dual function, since these serve as shock-absorbing elements in a 0.3 m drop test and acting forces on openings, nozzle or effectively reduce other local weak points of the radioactive object.

A transport arrangement for transporting a particular radioactive article of large mass, such as at least 400 t or more, and large dimensions, such as at least 3 mx 3 mx 8 m or more, in particular reactor pressure vessel or steam generator, comprising a support structure receiving the object and a transport vehicle, the Connecting means is connected to the support structure, according to the invention is characterized essentially by the fact that the support structure comprises a frame with a straight prismatic body spanning the longitudinal side frame legs with two lower first longitudinal frame legs and two upper second longitudinal frame legs that the first longitudinal frame legs with each other and the second longitudinal frame legs with each other are connected by transverse legs, between which the object is partially positionally positively positioned, that the first longitudinal frame legs end receptacles and the second frame legs e ndseitig have stop surfaces which are connected to support arms of a carrier wagon as the transport vehicle and / or against which the support arms, and that the support structure consists of a lower and an upper part, wherein the lower part of the first longitudinal frame legs and connecting them transverse legs and comprises the upper part of the support structure comprises the second longitudinal frame limbs which comprise these connecting transverse limbs and shielding elements emanating from the longitudinal frame limbs, which are connectable to the lower part of the support structure. In this case, the support structure is preferably designed in accordance with the features explained above or based on the features to be described in the exemplary embodiment.

For partially positively locking positioning of the article in the support structure, it is provided that the transverse limbs extending between the first and second longitudinal frame legs are adapted in sections to the outer geometry of the article, in particular show an arcuate course when a reactor pressure vessel is being transported. The second, so upper longitudinal frame legs can be connected both perpendicular to these and transverse to these transverse legs. The latter should have an angle α with 30 ° <α <60 °, in particular α = 45 ° to the longitudinal axis of the longitudinal frame legs. Same design options can be selected for the lower longitudinal frame legs.

Further details, advantages and features of the invention will become apparent not only from the claims, the features to be taken these features - alone and / or in combination - but also from the following description of a drawing to be taken preferred embodiment.

Show it:

1 is a side view of a support structure with this recorded item in the form of a reactor pressure vessel,

2 is a plan view of the arrangement of FIG. 1, partially broken away,

3 is a front view of the arrangement of FIG. 1,

4 is a section along the line A - A of Fig. 3,

5 is a rear view of the arrangement of FIG. 1,

Fig. 6 is a perspective view of the reactor pressure vessel and

Fig. 7, the support structure with pressure vessel arranged on a carrying bogie.

The teaching according to the invention is explained on the basis of a reactor pressure vessel 11 accommodated by a supporting structure 10, without this being intended to restrict it. Rather, the invention relates generally to Arrangements for transporting objects of large masses and large dimensions. Large masses mean extremely heavy loads of z. 300 t, 400 t or more. Dimensions of objects to be transported may refer to lengths of more than 8 m and diameters or edge lengths of 3 m and more, without this being a limitation.

The article, so the reactor pressure vessel 11 preferably has a cylindrical shape, as can be seen from the figures.

Regardless of this, it is provided that the heavy object, ie in the embodiment of the reactor pressure vessel 11, is received by the support structure 10, that all-sided protection is given simultaneous possibility to carry out a transport, while raising or lowering the support structure to the extent necessary 10 and thus the reactor pressure vessel 11 is made possible. At the same time the provisions regarding effective dose rates should be met, whereby an individual adaptation to the intensity of the radiation of the object to be transported should take place.

The support structure 10 according to the invention comprises four longitudinal frame legs 12, 14, 16, 18, which optionally frame further longitudinal frame legs span a frame which completely surrounds the reactor pressure vessel 11, that is, the envelope spanned by the longitudinal frame legs 12, 14, 16, 18 does not penetrate. This applies both circumferentially and frontally.

The longitudinal frame legs as a whole span a straight prism-shaped body having a rectangular, cuboid or trapezoidal cross-section, to name but a few preferred cross-sectional geometries. For reasons of simplification, the following is spoken of a parallelepiped shape which the longitudinal frame legs span, without this being intended to limit the teaching according to the invention. It is essential that a total of four longitudinal frame members, namely the lower and upper pairs of longitudinal frame members 12, 14, 16, 18 are present, with which the teaching of the invention is realized. The support structure 10 according to the invention is designed in such a way that it is possible to transport it with a carrying bogie carriage 20, which can be seen purely in principle from FIG. The carrier bogie 20 consists of two parts 22, 24, which are supported by multi-axle bogies or groups of bogies. On this beak-type support arms 26, 28 are based, which are connected to the support structure 10, ie the longitudinal frame legs 12, 14, 16, 18. The support arms 26, 28 are connected to a hydraulic equipment with which the support structure 10 can be raised or lowered and optionally moved horizontally.

In order to allow attachment to the support arms 26, 28 of the support bale carriage 20, fiction, according to provided that from the ends of the lower longitudinal frame legs 16, 18 receptacles such as tabs 30, 32, 34, 36 go out to which the support arms 26, 28 hinged become. The upper longitudinal frame limbs 12, 14 have in their ends pressure surfaces providing plate members 38, 40, to which the support arms 26, 28 are supported. Due to the relevant construction is a transport with the carrying baulk carriage 20 connected to the given by these advantages possible.

It also follows from the diagrammatic illustration that the lower or upper longitudinal frame legs 16, 18 and 12, 14 are connected via transverse legs 48, 50, 52 which run perpendicular to the longitudinal frame legs 12, 14, 16, 18. Further, obliquely to the longitudinal frame legs 12, 14, 16, 18 extending further transverse legs 54, 56 between the longitudinal frame legs 12, 14, 16, 18 extend, as Fig. 2 illustrates. These can form an angle α with the α axis preferably α = 45 ° and intersect.

Furthermore, according to the invention there is the possibility, to achieve a desired shielding effect between the longitudinal frame legs 12, 14, 16, 18 shielding elements in the form of plates 58, 60, 62, 64 to be arranged, wherein the thickness and thus shielding effect of the plates 58, 60, 62nd , 64 are dependent on the dose rate limits to be observed. Furthermore, it is apparent from FIG. 5 that the transverse limbs 48, 50, 52 of the support structure 10 have a geometry on the object side, which enables an at least partially positive reception of the object, that is to say in the embodiment of the reactor pressure vessel 12, in order to enable a clear positioning. In the embodiment, therefore, the transverse legs 48, 50, 52 formed in their object-side extending surfaces or areas in sections concave. The same can apply to the obliquely to the longitudinal frame legs 12, 14, 16, 18 transverse leg 56, 58.

The longitudinal frame legs 12, 14, 16, 18 are preferably tubes and may have lengths of 10 m to 20 m and diameters of 500 mm to 1000 mm, in particular of about 750 mm. The shield plates 58, 60, 62, 64 can be connected to the longitudinal frame legs 12, 14, 16, 18 z. B. be connected by welding, bolting or bolting. In particular, it is provided that the shielding elements such as the shielding plates 58, 60, 62, 64 are interchangeable with the longitudinal frame legs 12, 14, 16, 18 connectable. This is a self-inventive feature.

The support structure 10 according to the invention is formed in two parts and consists of a lower part, which is formed by the longitudinal frame legs 16, 18 and connecting them transverse legs 48. The corresponding part of the support structure 10 can be used to allow an in-house transport of the container 11. In this case, a transport can take place on suitable heavy-duty vehicles, which is driven into the intended for loading access to a reactor building. Then, the reactor pressure vessel 11 can be deposited by means of a reactor building crane on the lower part of the support structure 10 and pivoted from the vertical to the horizontal position.

The upper part of the support structure 10 with attached shielding, so shielding plates 58, 60, 62 is then placed on the reactor pressure vessel 11 recorded lower part of the support structure 10 and with this z. B. by welding, screws or bolted. Since the upper part already has the shielding, the dose loading of the personnel is substantially reduced in the corresponding assembly operations and the effective shielding. The connection of the lower and upper part can take place inside the reactor building or outside it.

Claims

An arrangement for transporting a radioactive object

1. Arrangement for transporting a particular radioactive article (11) of large mass, such as at least 400 t or more, and large dimensions, such as at least 3 mx 3 mx 8 m or more, in particular a cylindrical container such as reactor pressure vessel or steam generator, comprising an object receiving support structure (10) with connecting means (30, 32, 34, 36) for a transport vehicle (20), characterized in that the support structure (10) comprises a frame with a longitudinal prismatic body spanning a straight longitudinal frame legs with two lower first longitudinal frame legs (16, 18 ) and two upper second longitudinal frame legs (12, 14), that the first longitudinal frame legs with each other and the second longitudinal frame legs with each other via transverse legs (48, 50, 52, 54, 56) are connected, between which the object is partially positively positioned, that the first longitudinal frame leg end shots and the second longitudinal support leg (20) as the transport vehicle, and that the support structure (10) consists of a lower and an upper part, the lower part of the first longitudinal frame legs (12, 14, 16 , 18) and the transverse limbs (48) connecting them, and the upper part of the support structure (10) comprises the second longitudinal frame limbs (16, 18) and the transverse limbs (50, 52, 54, 56) connecting them and shielding elements () extending from the longitudinal frame limbs (16). 58, 60) connectable to the lower part of the support structure.

2. Arrangement according to claim 1, characterized in that the straight prismatic body has a rectangular, cuboid or trapezoidal shape in cross section.

3. Arrangement according to claim 1 or 2, characterized in that the transverse legs (48, 50, 52, 54, 56) on the object side for the positive fixing of the article (11) on the section side follow its outer geometry.

4. Arrangement according to at least one of the preceding claims, characterized in that the article (11) is arranged completely within the envelope of the longitudinal frame legs (12, 14, 16, 18).

5. Arrangement according to claim 1, characterized in that the shielding elements as plates (58, 60) are connected to the lower part of the support structure (10) by welding, screwing or bolting.

6. Arrangement according to at least one of the preceding claims, characterized in that the longitudinal frame legs (12, 14, 16, 18) tubes, square profiles and / or double-T-carrier.

7. Arrangement according to at least one of the preceding claims, characterized in that the longitudinal frame leg has a shape adapted to the object to be transported profile.

8. Arrangement according to at least one of the preceding claims, characterized in that between the longitudinal frame legs (12, 14, 16, 18) shielding elements as plates (58, 60, 62, 64) can be used or suspended.

9. Arrangement according to at least claim 1, characterized in that the shielding elements like plates (58, 60, 62, 64) have different shielding effects as a function of the dose power limit values to be observed

10. Arrangement according to at least claim 1, characterized in that the upper part of the support structure (10) has a sectionally U-shaped geometry.

11. Arrangement according to at least one of the preceding claims, characterized in that with the lower part of the support structure (10) connected and emanating from the upper part shielding plates (68) have a thickness d of 10 mm <d <120 mm.

12. Arrangement according to at least one of the preceding claims, characterized in that the transverse limbs (48, 50, 52) on the inside, in sections, have an article (11) supporting and / or positioning arcuately extending section.

13. Arrangement according to at least one of the preceding claims, characterized in that the longitudinal frame legs (12, 14, 16, 18) via transverse legs (56, 58) are connected to the longitudinal frame legs an angle α with 30 ° <α <60 ° , in particular α = 45 °.

14. Arrangement according to at least one of the preceding claims, characterized in that the obliquely to the longitudinal frame legs (12, 14, 16, 18) extending transverse legs (56, 58) intersect.

15. Transport arrangement for transporting a particular radioactive article (11) of large mass, such as at least 400 t or more, and large dimensions, such as at least 3 mx 3 mx 8 m or more, in particular reactor pressure vessel or steam generator, comprising a supporting structure receiving the article (10 ) and a transport vehicle (20), which is connected via connecting means (30, 32, 34, 36) to the support structure, characterized in that the support structure (10) comprises a frame with a longitudinal side a straight prismatic body spanning longitudinal frame legs with two lower first longitudinal frame legs (16, 18) and two upper second longitudinal frame legs (12, 14), that the first longitudinal frame legs with each other and the second longitudinal frame legs are interconnected via transverse legs (48, 50, 52, 54, 56), between which the object (11) can be positioned positively in sections, that the first longitudinal frame legs end Receiving and the second longitudinal frame legs end stop surfaces, which are connected to support arms (26, 28) of a carrier wagon (20) as the transport vehicle and / or against which the support arms, and that the support structure (10) of a lower and an upper part wherein the lower part comprises the first longitudinal frame legs (12, 14, 16, 18) and the transverse legs (48) connecting them, and the upper part of the support structure (10) comprises the second longitudinal frame legs (16, 18) connecting the transverse legs (16) connecting them ( 50, 52, 54, 56) and outgoing from the longitudinal frame members Abschirmelemente (58, 60), which are connectable to the lower part of the support structure.

16. Transport arrangement according to claim 17, comprising features of at least one of claims 1-16.