RU2700661C1 - Packing kit for transportation and/or storage of spent fuel assemblies - Google Patents

Abstract

FIELD: package and storage.

SUBSTANCE: invention relates to containers for transportation of spent nuclear fuel (SNF) of a research reactor for storage and processing. Packing kit for transportation and/or storage of spent fuel assemblies (SFA) of a nuclear reactor includes a protective container and a withdrawable part. SFA is arranged in tiers. Between cover of protective container and cover of upper tier damper is installed with support on end surface of upper cover. Each jacket comprises a central pipe, spacing discs interconnected by a central pipe, a shell having a support ring. SFA are arranged relative to axis of central pipe in two circular rows. Axes of channels in each row of upper cover are shifted relative to axes of channels of corresponding row of lower cover so that ends of cases with SFA of top cover can be arranged between cases with SFA of lower cover. Along the entire length of each jacket and part of the damper length there are two longitudinal slots for orientation of covers and a damper in the container. Guide for angular alignment of covers and a damper is installed inside the container housing with support on the bottom and internal end surface of the housing.

EFFECT: invention allows arrangement of the largest number of canisters with the SFA in the container.

5 cl, 10 dwg

Description

The invention relates to containers intended for safe transportation by rail from the storage sites for spent nuclear fuel (SNF) of a research reactor for storage and reprocessing.

Currently, transport packaging kits (TUKs) are used to transport spent nuclear fuel. Known TUKs consist of a sealed power container and a cover placed inside the container, having spacing diaphragms with channels for SNF. The container and the cover, as a rule, are intended for transportation and / or storage of spent fuel assemblies (SFA) of a particular type of reactor. The safety of transportation or storage in the SFA container is justified by the calculations: strength, nuclear and radiation safety and thermal calculation.

Known TUK for transporting SFAs of research nuclear reactors, made on the basis of the TK-32 container (Yu.V. Nechetky, Z.I. Chechetkina, AF F. Grachev, AE Novoselov. Research reactor fuel, its storage and processing. Under the general editorship of Yu.V. Chechetkin (Dimitrovgrad, DITUD, UlSTU, 2005, p. 195). The TUK contains a protective container and a removable part, inside of which covers are placed in one tier to accommodate the SFA. The protective container consists of a housing and a lid. The container body, the withdrawal part and each cover have supporting surfaces, the supporting surface of the withdrawal part is mating with the supporting surface of the container body. Two cargo trunnions are welded to the body in the upper part, half rings and rings are welded in the upper, middle and lower parts, and supports with a support ring are welded to the bottom. The middle ring with ribs welded to it from above serves as a support platform when installing the TUK in a railway carriage of the TK-VG-18 type. In the upper and lower parts of the body, valves for drainage of water and ventilation of the container are installed. The lid of the container is sealed to the housing. On the outer end surface of the cover there are ribs. The supports, support ring, rings, half rings, and also the lid of the container provide the necessary level of damping of the container when it falls.

The removable part of the container has various options for covers 01 and 02. The removable part under the cover 01 is used to place one 12-seater cover for the SFA of the SM research reactor in the TK-32 container and is a welded structure consisting of a base, a central pipe, and three racks and flange. The extraction part is supported by a flange on the container body. The removable part under the cover 02. is used to place three 7-seater covers for the SFA, the MIR research reactor in the TK-32 container, and is a welded structure consisting of a base, three pipes into which the covers are installed, two spacing diaphragms for fixing the position of the removable parts in container and flange. The extraction part is supported by a flange on the container body.

The disadvantage of this TUK is the small number of SFA loaded into the container, because covers with SFA are placed in a container in one tier.

Known packaging for transportation and / or storage of spent fuel assemblies of a research nuclear reactor (p. RU No. 88839, G21F 5/008, publ. 20.11.2009 Bull. No. 32).

The packaging kit contains a protective container and a removable part, comprising at least two supporting positioning devices, inside of which at least one cover is placed for accommodating the spent fuel assemblies, the covers being arranged in tiers one above the other, while the container body, positioning devices and each case have at least one supporting surface, and the supporting surface of one positioning device is mated with the supporting surface of another positioning devices or with the supporting surface of the container body. A packaging kit according to claim 1, characterized in that the positioning devices are placed in tiers one above the other, while at least the upper positioning device is provided with a flange with a supporting surface mating with the supporting surface of the container body or with the supporting surface of the lower positioning device.

This packaging set is taken as a prototype, as the closest in technical essence to the claimed technical solution.

The disadvantages of this packaging are:

- placement in a container of at least two tiers of positioning devices, inside which covers with SFA are placed, is possible only for short covers with SFA, since the total length of the supporting positioning devices is limited by the length of the internal cavity of the container;

- the number of SFAs placed in the case is limited by the internal diameter of the positioning device, which is significantly smaller than the diameter of the container’s internal cavity;

- covers with SFA after installation in the container body are not fixed from longitudinal movements, which in case of an emergency during transportation can lead to impact of the cover of the upper tier and the SFA placed in it on the inner cover. Given the possibility of such a situation, damage to the SFA is not excluded, and if they are placed in sealed canisters, damage and loss of tightness of the cans.

The technical result consists in ensuring that the container contains the largest number of SFA canisters, for example, a TK-32 container for the BOR-60 research reactor, which meets the standards and rules for safe transportation in force in nuclear energy.

The technical result is achieved by the fact that in a packaging kit for transporting and / or storing spent fuel assemblies of a research nuclear reactor, comprising a protective container consisting of a housing and a lid and an extraction part including at least two covers for accommodating spent fuel assemblies ( SFA), arranged in tiers one above the other, the lower cover is installed on the bottom of the case, the upper cover is supported by the end surface of the lower cover, between the cover of the protective container and the cover The upper layer has a damper mounted on the end surface of the upper cover, each cover contains a central pipe with a fungus for the load gripping device, spacer discs interconnected by a central pipe, a shell with a support ring, and pipes, in the spacer discs there are channels for accommodating SFA which are located relative to the axis of the central pipe in at least two annular rows, while the axis of the channels in each row of the upper cover are offset in an angle relative to the axis of the channels, respectively the row of the lower cover so that the ends of the cases with the SFA of the upper cover have the possibility of placing between the cases with the SFA of the lower cover, along the entire length of each cover and part of the length of the damper there are two longitudinal grooves for the orientation of the covers and the damper in the container; bearing on the bottom and the inner end surface of the housing guide for the angular orientation of the covers and damper.

In the support ring of the shell of the upper cover there are diametrical grooves for the head parts of the canisters with SFA placed in the channels of the extreme annular row of the lower cover.

The damper is made in the form of a welded cup, consisting of a shell having a support ring, in which diametrical grooves are made for the head parts of the SFA canisters placed in the channels of the extreme annular row of the upper cover, a disk with a central pipe having a flange on which a fungus is mounted devices, the disk is located below the end surfaces of the shell and the central pipe, located at the same level, and the supporting Central pipe, fixed by fasteners on the flange.

The guide consists of upper and lower support rings, interconnected by two guide posts with tips, while the posts are screwed into the threaded holes of the lower support ring and fastened to the upper support ring by means of fasteners and strips screwed onto the sleeve of the tips. The outer side surface of the upper support ring is conical in shape and has a longitudinal groove for the angular orientation of the guide in the container. Spacer wedges are mounted on the end surface of the upper support ring using fasteners.

The presence of the guide allows you to install covers and a damper in the container body in a predetermined angular position, while the guide itself is fixed in the body using spacer wedges.

The execution of each cover in the form of a welded structure consisting of a central pipe with a fungus for a lifting device, spacer discs interconnected by a central pipe, a shell with a support ring and pipes, the arrangement of channels for SFAs in spacer discs relative to the axis of the central pipe, at least in two ring rows, while the axis of the channels in each row of the upper cover are offset in angle from the axis of the channels of the corresponding row of the lower cover, the diameter of the support ring of the upper cover cial grooves at head portions of the canisters with SFA placed in annular channels extreme lower row cover, so that the ends of the canisters with SFA upper cover had a chance to be placed between the canisters with SFA lower cover, allows:

- to provide the necessary rigidity of the covers and place the covers in a container in two tiers with the support of the lower cover on the bottom of the housing, and the upper cover with support on the end surface of the lower cover, while the fungus of the lower cover enters the central tube of the upper cover;

- increase the total number of canisters with SFA placed in the covers, the length of which is more than half the length of the internal cavity of the container, due to the fact that the ends of the canisters with SFA of the upper cover have the ability to be placed between the canisters with the SFA of the lower cover.

Performing a damper with a central support tube and a support ring having diametrical grooves for the head parts of the SFA canisters placed in the channels of the extreme annular row of the upper cover allows the damper to be installed between the cover of the protective container and the cover of the upper tier with support on the end surface of the upper cover.

The presence of a disk damper located below the end surfaces of the shell and the central pipe located at the same level eliminates the direct contact of the canisters with the SFA located in the upper case and the container lid. Moreover, in the event of an emergency, the longitudinal dynamic loads acting on the canisters with the SFA do not exceed the level at which the strength and tightness of the canisters with the SFA is maintained.

The presence of the fungus for the load gripping device in each case and damper allows the use of standard lifting devices for their installation in the container and extraction from it, while the cases can be loaded with SFA canisters.

In FIG. 1 shows a General view in section of a transport packaging for transportation by rail in a container TK-32 SFA research reactor BOR-60, placed in sealed canisters, FIG. 2 is a section AA in FIG. 1, in FIG. 3 is a section BB in FIG. 2, in FIG. 4 is a section BB in FIG. 2, in FIG. 5 is a general sectional view of the lower case; FIG. 6 is a view A in FIG. 5, in FIG. 7 is a general sectional view of a top cover; FIG. 8 is a view A in FIG. 7, in FIG. 9 is a cross-sectional perspective view of a damper; FIG. 10 is a view A in FIG. 9.

The transport packaging set consists of a container 1 having a body 2 and a cover 3, a guide 4, a lower cover 5, a upper cover 6 and a damper 7.

Case 2 has a longitudinal bar 8,

The guide 4 (see Fig. 2, 3 and 4) is made of corrosion-resistant steel and consists of a lower support ring 9, an upper support ring 10 with a groove a, two guide racks 11 with tips 12 having a sleeve 13 onto which the strap 14 is screwed , fasteners 15 and spacer wedges 16 with fasteners 17.

The lower case 5 (see Figs. 5 and 6) is made in the form of a welded construction made of corrosion-resistant steel and consists of a central pipe 18, spacer discs 19, having channels b located in two ring rows relative to the axis of the central pipe 18, shell 20, supporting rings 21 and pipes 22 mounted coaxially with the channels b of the inner annular row. The cover has two longitudinal diametrically located grooves c. A fungus 23 is mounted on the central pipe 18 using fasteners.

The upper case 6 (see Figs. 7 and 8) is made of a welded construction made of corrosion-resistant steel and consists of a central pipe 24, spacer discs 25 having channels d located in two ring rows relative to the axis of the central pipe 24, shell 26, and support ring 27 having diametrical grooves e and pipes 28 mounted coaxially with the channels d of the inner annular row. The cover has two longitudinal diametrically located grooves f. A fungus 29 is mounted on the central pipe 24 using fasteners.

Damper 7 (see Figs. 9 and 10) is made of corrosion-resistant steel and consists of a welded beaker 30, including a shell 31, a support ring 32 with diametrical grooves g, a disk 33, a central pipe 34 and a flange 35, a welded central support pipe 36, having a flange 37, and a fungus 38 mounted using fasteners on the flange 35. The damper has two longitudinal diametrically located grooves h.

The installation of the guide 4, covers 5 and 6, and the damper 7 in the container 1 is carried out in the following sequence:

- remove the cover 3 from the container 1;

- a guide 4 is installed in the housing 2, while the lower support ring 9 is supported on the bottom of the housing 2, and the upper support ring 10 with the guide posts 11 fixed on it are supported gaplessly on the mating inner end surface of the housing 2 by rotation of the sleeves 13. The angular position of the guide it is fixed by the longitudinal bar 8 available in the housing 2, which extends into the groove of the upper support ring 10. Fasten the guide 4 in the housing 2 using spacer wedges 16 and fasteners 17;

- install the lower cover 5 in the housing 2 with support on the bottom of the housing 2, then the upper cover 6 with the support on the lower cover 5 and the damper 7 with the support on the upper cover 6, while lifting the covers and the damper is made for fungi 23, 29 and 38 accordingly, using a standard lifting bar. When loading combine the longitudinal grooves f, g and h, respectively, of the covers and damper with guide racks 11;

- install on the housing 2 the cover 3.

The loading of the transport packaging set with SFA canisters is carried out in the following sequence:

- according to the standard technology for handling the container TK-32, it is prepared for placement in the pool, and after removing the cover 3, the damper 7 and the upper cover 6 are removed from the housing 2;

- building 2 with the lower case 5 located inside it is placed in the pool using standard treatment technology;

- load the lower 5 canisters from the SFA into the case using the standard technology for handling canisters;

- install the upper 6 case into the case 2 with support on the lower 5 case and load canisters from the SFA into it;

- install damper 7 in the housing 3 with support on the upper cover 6;

- using standard technology, cover 3 is mounted on housing 2 and the container is removed from the pool;

- using standard technology, the loaded container is prepared for transportation by rail, while the lid 3 is fixed with fasteners on the housing 2.

Unloading canisters with SFAs from a transport packaging set is carried out according to standard technology for handling transport packaging kits loaded with SFAs in the following sequence:

- at the post of unloading covers with SFAs, remove cover 3 from the container;

- take out the damper 7 from the housing 2;

- remove from the case 2 the upper cover 6 with the installed cases with SFAs in it and transfer the cover to the pool;

- remove the bottom 5 cover from the case 2 with the SFA canisters installed in it and transfer the cover to the pool;

- canisters with SFA are unloaded from the covers in the pool. The handling of a case with SFA unloaded from the case is carried out in accordance with the standard technology for handling SFA adopted at the enterprise;

- after unloading the covers are removed from the pool;

- using standard technology, preparation and assembly of the transport packaging for transportation by rail is carried out.

A prototype of the transport packaging set was made using the TK-32 container. The control loading and unloading of 30 canisters from / to it from the SFA of the BOR-60 research nuclear reactor was successfully performed.

Claims (5)

1. A packaging kit for transporting and / or storing spent fuel assemblies of a research nuclear reactor, comprising a protective container consisting of a housing and a lid, and a removable part comprising at least two covers for accommodating spent fuel assemblies (SFAs) arranged in tiers one above the other, characterized in that the lower cover is installed on the bottom of the case, the upper cover rests on the end surface of the lower cover, between the cover of the protective container and the cover of the upper tier of the mouth A damper is installed with support on the end surface of the upper cover, each cover contains a central pipe, spacer discs interconnected by a central pipe, a shell having a support ring, and pipes, in the spacer discs there are channels for accommodating SFAs, which are located relative to the axis of the central pipe at least two annular rows, while the axis of the channels in each row of the upper cover are offset relative to the axis of the channels of the corresponding row of the lower cover so that the ends of the canisters with SFAs are the cover had the opportunity to place a lower cover between the canisters with the SFA of the lower cover, along the entire length of each cover and part of the length of the damper there are two longitudinal grooves for the orientation of the covers and the damper in the container, a guide for angular orientation is mounted inside the container body with support on the bottom and the inner end surface covers and damper. 2. A packaging set according to claim 1, characterized in that in the support ring of the shell of the upper cover there are diametrical grooves for the head parts of the canisters with SFA placed in the channels of the extreme ring row of the lower cover. 3. The packaging set according to claim 1, characterized in that the damper is made in the form of a welded cup, consisting of a shell having a support ring, in which diametrical grooves are made for the head parts of the canisters with SFAs placed in the channels of the extreme annular row of the upper cover; a disk with a central pipe having a flange with a central hole in which a fungus is mounted for the load gripping device, the disk being located below the end surfaces of the shell and the central pipe that are at the same level and the supporting central pipe fixed by fasteners to the flange. 4. A packaging kit according to claim 1, characterized in that the guide consists of upper and lower support rings interconnected by two guide posts with tips, while the posts are screwed into the threaded holes of the lower support ring and fastened to the upper support ring by means of fasteners and strips screwed onto the sleeve sleeves; the outer side surface of the upper support ring is conical and has a longitudinal groove for the angular orientation of the guide in the container; spacer wedges are mounted on the end surface of the upper support ring using fasteners. 5. A packaging kit according to claim 1, characterized in that the central tube of each case is equipped with a fungus for a load gripping device.

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