RU2543028C2 - Fuel element rack - Google Patents

Abstract

FIELD: atomic physics.

SUBSTANCE: invention relates to nuclear engineering and specifically to a loading/unloading and transportation device, particularly a rack for fuel elements used, for example, in assembling a hexagonally shaped bundle for a fuel assembly. The fuel element rack has a rectangular shape and combs, a load-bearing element and pins are mounted on its structural frame. A row of clamping plates is mounted in its top part. The structure has L-shaped flaps mounted on rotary axes with gear sectors in their top part and actuated by a drive of the rotation mechanism thereof. The drive of the mechanism has a double-sided gear rack which interacts with the gear sectors of the rotary axis to prevent the fuel elements from falling from the clamping plates.

EFFECT: invention shortens the duration of assembling a bundle of fuel elements, increases the accuracy of positioning a fuel element rack, increases the relative capacity of the rack and shortens the loading/unloading time thereof.

7 cl, 4 dwg

Description

The invention relates to nuclear technology, and in particular to a device for loading / unloading and transportation, in particular to a store for fuel elements (fuel elements), used, for example, in the process of assembling a hexagonal-shaped beam for a fuel assembly (FA).

A feature of the store is that its most optimal shape is rectangular. This form ensures the placement of the maximum number of fuel rods in the store and the ease of their installation / removal by means of a robot operating in a rectangular coordinate system. In this case, the store is placed vertically when loading / unloading fuel rods and horizontally during its transportation. The fuel rods should not be interwoven and drop out of the store at any angular position of the latter, including when transporting it in a protective container.

A well-known store of fuel elements (Wordsworth AD Technique for working with nuclear fuel. - M .: Atomizdat, 1965: P.18-19), made in the form of a cylinder, on the periphery of which there are cells for fuel elements, and containing a store drive for it turning.

A disadvantage of the well-known magazine for fuel rods is the implementation of a technological operation using the magazine drive associated with the rotation of the magazine, which reduces the accuracy of positioning and increases the loading / unloading time of the magazine. The fuel rods are removed by grabbing the loading machine in the vertical direction (up), which is associated with an increase in the size of the preparatory room.

A device is known for assembling tubular products in a hexagonal beam (A.S. SU No. 1017463 A, B23P 15/26, B23P 19/00, publ. 1983), containing a base on which the magazine is fixed under the rod-type products with an inserted into it with a cassette held by a spring clip and turning one step by means of an installed step drive along with the magazine.

The disadvantages of this invention is the implementation, using installed on the basis of the device stepper drive, the rotation of the store with a cartridge for the product, which reduces the accuracy of its positioning. A magazine with a cassette inserted in it does not provide the maximum number of product locations, which increases the frequency of reinstallation, the loading / unloading time of the magazine, and the assembly cycle of the product bundle in a fuel assembly.

A device for assembling tubular products into a hexagonal beam (A.S. SU No. 1290645 A, B23P 15/26, B23P 19/00, publ. 1985) is known. It is installed in a protective chamber and contains a drive, which is a mobile platform with a step drive and a magazine installed in a mobile platform, made with grooves for products.

The disadvantage of this invention is the movement due to the stepper drive in the horizontal direction of the platform with a magazine for products installed in it, increasing the cycle time of assembling the bundle of products in fuel assemblies.

The basis of the invention is the technical task to develop a magazine design for loading / unloading and transporting fuel elements that create radiation, their maximum capacity to reduce the assembly cycle time of a fuel bundle in a fuel assembly.

The invention consists in the following.

A fuel magazine, comprising fuel elements for cells and interacting with a vertical stationary support (support) along rectilinear guides, according to the invention, comprises a fixed load-bearing element on a supporting frame structure with spikes, a series of fixing plates for hanging fuel rods, several combs for spacing fuel rods and spring-loaded rotary bearings -shaped shutters with a mechanism for their rotation to limit the fuel rods from falling out of the fixing plates, L-shaped shutters fixedly mounted on the rotary axes with a tooth open sectors in the upper part of these axes and driven by a drive mechanism for their rotation, made with a double-sided gear rack interacting with the tooth sectors of the rotary axes, to limit the fuel rods from falling out of the fixing plates.

In the particular case of execution, the combs are made in the form of strips with vertical grooves for the fuel rods.

In the particular case of execution, combs are fixed uniformly along the height of the store.

In the particular case of execution, the fixing plates are made in the form of the corresponding shape of the shanks strung on them with fuel rods.

In the particular case of execution, torsion springs are put on the rotary axes to tighten the wings.

In the particular case of execution, the support is made with an upper stop to limit the vertical movement of the magazine when it is installed in the support.

In the particular case of execution, the drive mechanism for turning the wings is installed in the upper part of the support.

The invention provides the following, in particular, technical results:

- reduction of the assembly cycle time of the fuel rod bundle in the fuel assembly;

- improving the accuracy of the positioning of the store for fuel elements;

- increase the relative capacity of the store for fuel elements;

- reducing the time of loading / unloading the store for fuel elements.

Reducing the assembly cycle time of a bundle of fuel rods in a fuel assembly and increasing the relative capacity of the store for fuel rods is achieved as follows: the rectangular shape of the store design allows for more compact placement of more fuel rods in it, and the more fuel rods in the store, the less often it needs to be replaced.

Improving the accuracy of positioning and reducing the time of loading / unloading of the magazine for fuel rods is ensured by the fact that it is fixed and the drive of its rotation is excluded compared to the rotary magazine.

The invention is illustrated in figures 1-4:

figure 1 - appearance of the store;

figure 2 is a section along aa (figure 1);

figure 3 is a section along BB (figure 1);

figure 4 is a section along BB (figure 1).

The store for the fuel elements 1 (Fig. 1) is rectangular in shape with the possibility of compact placement of a larger number of fuel elements in it, which reduces the cycle time of assembling a bundle of fuel elements in a fuel assembly. The store for the fuel elements 1 (Figs. 1, 2, 4) contains a load-bearing element 2 and, on the sides, vertical spikes 3, a series of retaining plates 4 for hanging the fuel elements 16 (Fig. 3) and a comb 5 for spacing the fuel elements.

The locking plate 4 (figure 4) is installed in the upper part of the store for fuel rods 1 and is made in the form corresponding to the shape of the shanks of the rods 16 being strung on them, and in height corresponding to the height of the comb 5.

The combs 5 (Fig. 4) are made in the form of strips with vertical grooves for the fuel rods 16 and are mounted uniformly vertically of the supporting frame structure of the magazine for the fuel rods 1.

The store for the fuel rods 1 is equipped with flaps 6 (figure 3), made L-shaped, spring-loaded with a torsion spring 7 (figures 1, 2) and rotary due to the mechanism of their rotation (not shown), designed to limit the fuel rods from falling out of the fixing plates 4 (figure 4).

Torsion springs 7 (Fig. 2) are mounted on vertical rotary axes 8 (Figs. 1, 2) and are fixed with one fixed end on the carrier frame of the fuel rod store 1, and the other are pressed externally to the rotary shutters 6 (Fig. 3).

In the upper part of the vertical rotary axis 8 (figure 2) is made with gear sectors 9 (figure 2), which are engaged with the rack 10.

Rail 10 (figure 2), included in the rotation mechanism of the leaves 6, is made of horizontal bilateral gear-shaped and interacts with the gear sectors of the vertical rotary axes 8.

L-shaped sash 6 (figure 3) under the action of the efforts of torsion springs 7 are made with the possibility of closing the magazine for fuel rods 1 (figure 1) after loading / unloading and fixedly connected to the vertical rotary axes 8 (figure 2).

The height of the store for fuel elements 1 is made closed from the upper side of the groove 11 (figure 3).

The magazine for fuel elements 1 is installed in the support 12 (figure 1), made with the upper stop 13 (figure 1) and straight guides 14 (figure 2), covering the vertical spikes 3 (figure 2) of the magazine for fuel elements 1.

The upper stop 13 is made to limit the vertical movement of the store for fuel rods 1 when it is installed in the support 12, and the vertical spikes 3 are made to interact with the straight guides 14 of the support 12.

In the upper part of the support 12 (Fig. 1), the linear actuator 15 is horizontally linear (Fig. 1), the pusher of which interacts with the rail 10 (Fig. 2) and moves it.

On the fixing plates 4 (Fig. 4), fuel rods 16 (Fig. 3) are conventionally shown which are loaded / unloaded from the magazine.

The device operates as follows.

Before loading the fuel rods 16, an empty magazine for the fuel rods 1 is installed vertically from above in the support 12. Moreover, its spikes 3 are included in the straight guides 14 of the support 12. The vertical stroke of the store is limited by the upper stop 13 of the support 12.

After installing the magazine for the fuel rods 1 in the support 12 motionless, which increases the accuracy of positioning and reduces the time of loading / unloading the magazine, include a linear actuator 15, which moves the rail 10 with its pusher, and that, in turn, through the gear sectors 9 and vertical rotary axes 8 opens the sash 6, tightened by torsion springs 7.

In the open store for the fuel rods 1 by means of remotely controlled equipment, the fuel rods 16 are mounted on the fixing plates 4. In this case, the grooves for the fuel rods of the comb 5 limit the mobility of the fuel rods 16 in the horizontal plane.

After filling in the fuel rods 16 store for fuel rods 1 turn off the linear actuator 15, in which its pusher is retracted. The shutters 6 are closed under the action of the force of torsion springs 7, the vertical rotary axes 8 and the gear sectors 9 are rotated, and the rack 10 is moved to the retracted position.

After these actions, the filled store for fuel elements 1 for the load-bearing element 2 is vertically removed from the support 12 and sent to its destination. When unloading the fuel rods 16 from the store for fuel rods 1, these operations are repeated, except that the loading of the fuel rods is replaced by their unloading from the store for fuel rods 1.

Claims (7)

1. Shop for fuel elements, containing cells for fuel elements and interacting with its support along vertical straight guides, characterized in that it is rectangular in shape, combs, a load-bearing element and spikes are fixed on its supporting frame structure, and a row is fixed in its upper part fixing plates, while the frame structure is made with leafs of the L-shaped form, mounted on rotary axes with gear sectors in their upper part and driven by a drive mechanism to rotate them Manufactured with double sided toothed rack cooperating with the toothed sectors rotary axes for limiting the fuel rods from falling out from the fixing plates. 2. The store according to claim 1, characterized in that the combs are made in the form of trims with vertical grooves for the fuel rods. 3. The store according to claim 1, characterized in that the combs are fixed uniformly along the height of the store. 4. The store according to claim 1, characterized in that the locking plates are made in a shape corresponding to the shape of the shanks of the fuel rods strung on them. 5. The store according to claim 1, characterized in that torsion springs are put on the rotary axes to preload the wings. 6. The store according to claim 1, characterized in that the support is made with an upper stop to limit the vertical movement of the store when it is installed. 7. Shop according to claim 1, characterized in that the drive mechanism for turning the wings is installed in the upper part of the support.

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