RU144514U1 - SAFETY DEVICE FOR OVERLOADING OF AMPOULES WITH BEAMS OF EXHAUST HEAT-FUEL ELEMENTS - Google Patents

Abstract

1. Safety device for reloading ampoules with bundles of spent fuel elements, consisting of a collet equipped with petals, at the ends of which external and internal stops are made, and attached to it with the possibility of vertical movement and interaction at its lower position with the petals of the collet of the sleeve, and in the upper part of the collet and bushing are provided with internal shoulders. 2. The device according to claim 1, characterized in that the connection and vertical movement of the sleeve along the collet is carried out using a bayonet connection, and the length of its vertical groove is equal to the length of the collet petals.

Description

The utility model relates to nuclear engineering, in particular, to means for ensuring safety during overloading of ampoules with bundles of spent fuel elements (fuel elements) of the RBMK-1000 reactor into canisters and is intended for use in a canister assembly chamber (CCL) of a dry storage facility or at nuclear power plants.

In a “dry” storage facility for spent nuclear fuel (SNF), ampoules for spent fuel assemblies (see RF patent No. 2353010 Cl. G21F 5/008, 2008), with bundles of fuel elements placed in them (hereinafter referred to as ampoules with bundles of fuel elements) arrive in a transport case installed inside the protective container. The transport case with the loaded ampoules is removed from the protective container and placed in the receiving slot of the KKP. In KKP, ampoules with fuel rod bundles are reloaded from the transport case into sealed spent nuclear fuel storage cases (see RF patent No. 2372678, Cl. G21F 5/008, 2008), hereinafter referred to as pencil cases. The mass of the ampoule with a bundle of fuel rods is 104 kg.

The ampoule for the spent fuel assembly (see RF patent No. 2353010, G21F 5/008), contains a cylindrical body with a bottom, which contains a bundle of spent fuel rods and a cover fixed in the upper part of the body. The housing consists of a pipe, a neck, a bottom and a damper. A chamfer is made in the neck with a transition to a smaller diameter for connection with the pipe. The lid is fixed with the housing by a locking device made in the form of a spring split ring installed in the groove of the neck. In the neck there are 6 holes located opposite the locking device. The neck of the lid and body have the same grooves under the grip. When placing the upper bundle of fuel assemblies in a known ampoule, its central rod rests in the bottom of the ampoule, and the cylindrical part of the upper tip of the fuel assemblies enters the internal cavity of the spring on the cover outside the housing. The spring on the cover fixes the upper bundle of fuel rods in the ampoule after installing the cover.

Overloading of ampoules with fuel rod bundles is carried out remotely by an electromechanical non-copying bridge manipulator with a lifting capacity of 500 kg (project 1697-20-0002 developed by OJSC Central Engineering Design Bureau).

The gripper of the electromechanical non-copying bridge manipulator, designed to engage ampoules with fuel rods in the inner shoulders of the ampoule cover, contains three legs mounted in the housing on the axes. The tabs are reduced to the minimum diameter by spring-loaded stops mounted in cups radially attached to the body and resting on the outer surfaces of the legs. The breeding of the legs is carried out by a conical pusher installed between the inner surfaces of the legs and interacting with the rollers installed in the grooves of the legs on the axes.

To introduce the paws of a known grip under the inner shoulders of the ampoule cover, the conical pusher rises, while the spring-loaded stops reduce the paws to the minimum diameter and they are inserted into the ampoule cover under the inner shoulders of the groove. Next, the conical pusher moves down and, interacting with the rollers on the legs and compressing the springs of the stops, spreads the legs until they touch the wall of the groove in the lid. As a result, the legs hook the ampoule to the inner shoulders of the lid.

In practice, cases of uncoupling of caps with cases during transportation of empty ampoules were observed in dry storage and at nuclear power plants.

A safety analysis showed that when overloading the ampoules in the control panel with a well-known grip of the electromechanical non-copying bridge manipulator, there is also the possibility of disengaging the lid from the ampoule body loaded with the fuel rod bundle, which can lead to an emergency.

Based on this, an urgent task is to increase safety during ampoule overload.

The technical result that can be obtained by implementing the utility model is to create a device that additionally engages the lid with the ampoule body when overloading ampoules loaded with fuel rods.

To achieve the specified technical result, a safety device for overloading ampoules with bundles of spent fuel elements is made of a collet equipped with petals, at the ends of which external and internal stops are made. The collet is connected with the possibility of vertical movement and interaction at its lower position with the petals of the collet sleeve. The upper part of the collet and the sleeve are equipped with internal shoulders.

In the particular case of execution, the connection of the sleeve to the collet and the vertical movement of the sleeve along the collet is carried out by means of a bayonet connection, the length of its vertical groove being equal to the length of the collet petals.

The implementation of the proposed safety device from a collet provided with petals, at the ends of which external and internal stops are made and connection to the collet with the possibility of vertical movement and interaction with its lower position with the petals of the sleeve allows you to push the collet petals to place the collet on the ampoule cover by vertical movement of the sleeve down the ampoule body and engage the ampoule body with the collet, and when lifting the sleeve, release the petals and disengage the ampoule body with the collet.

The supply of the collet with the inner shoulders allows, in case the lid locking device is disengaged from the ampoule body, to lean the ampoule cover, held by the gripper of the electromechanical manipulator, into the inner shoulders of the collet, and thereby ensure the holding of the ampoule body (fixed by the inner shoulders of the collet petals) by the chamfer ampoule body.

Thus, additional bonding of the lid with the ampoule body by the proposed device is carried out, which prevents the ampoule body from falling off with a bundle of fuel rods and increases the safety of overloading the ampoules with bundles of fuel rods.

Attaching the sleeve to the collet and the vertical movement of the sleeve along the collet is carried out using a bayonet connection, which allows you to get two fixed position of the sleeve relative to the collet: the upper and lower. With the upper position of the sleeve provides a free statement of the proposed device on the ampoule, and in the lower position - preloading the petals to the body of the ampoule with the sleeve.

The equality of the lengths of the vertical groove of the bayonet connection and the collet petals allows you to get the sleeve stroke along the collet between its two fixed positions, ensuring both the pressing of the petals to the ampoule body and their free position when removing the proposed device from the ampoule.

The proposed device is illustrated by drawings, presented in figure 1, figure 2; figure 3 and figure 4.

Figure 1 shows the proposed device for overloading of ampoules;

Figure 2 shows the proposed device in the context before setting on the ampoule;

Figure 3 shows the proposed device in the context of the engagement of the ampoule by gripping the electromechanical manipulator;

Figure 4 shows the proposed device in the context of the disengagement of the ampoule cover with the housing.

To work with the proposed device 1 are used (see figure 1) a non-copying bridge electromechanical manipulator 2, located in the dry storage storage compartment, with a gripper 3, legs 4 of which are inserted under the inner shoulders 5 of the cover 6 of the ampoule 7, loaded with a bunch of fuel rods 8. Case 9 ampoules 7 are chamfered 10.

The proposed device 1 (see figure 2) consists of a collet 11 with a sleeve 13 connected to it, with the possibility of vertical movement and fixing the sleeve 13 in the upper position, using a bayonet connection 12. The collet 11 is equipped with petals 14, at the ends of which are made 15 and internal 16 emphasis. Collet 11 and sleeve 13 are provided with inner shoulders 17 and 18, respectively.

The bayonet connection 12 consists of a pin 19 attached to the collet 11, which enters the vertical groove 20 with an opening 21 made on the sleeve 13. The length of the vertical groove 20 is equal to the length of the petals 14 of the collet 11.

The proposed device operates as follows.

In the initial position, the sleeve 13 is in the upper fixed position relative to the collet 11, while the pin 19, mounted in the collet 11 is inserted into the hole 21 of the sleeve 13.

The proposed device 1 is installed on the ampoule 7, which uses copying manipulators (not shown in the drawings), also installed in the CCP. With the emphasis of the inner shoulders 17 of the collet 11 (see figure 3) on the cover 6 of the ampoule 7, the ends of the petals 14 of the collet 11 are placed under the chamfer 10 on the housing 9. By the copy manipulator, the pin 19 is withdrawn from the hole 21 into the vertical groove 20 and the sleeve 13 is fed downward, due to the interaction of the sleeve 13 with the internal stops of the sleeve 15, the internal stops of the collet 14 are pressed against the body 9, ensuring reliable engagement of the body 9 with the collet 11. Next, the tabs 4 of the gripper 3 of the electromechanical manipulator 2 are inserted inside the bore in the cover 6 of the ampoule 7, the hook Thread for its internal shoulders 5. The ampoule 7 with the beam 8 fuel rods extracted from the transport cover is transported to the storage canisters and mounted in its cell. Moreover, in normal operation, the proposed device 1 is not involved.

The proposed device is removed from the ampoule after the grip 3 is disengaged from the cover 6. The sleeve 13 rises by the copy manipulator and is fixed in the upper position by inserting the pin into the hole 21. In this case, the petals 14 of the collet 11 extend from the housing 9 and do not interfere with the removal of the device 1 and its reinstallation on next overloaded ampoule 7.

In case of disengagement of the locking device 24 of the cover 6 with the housing 9, the proposed device 1 is included in the work and ensures that the housing 9 with the bundle of fuel rods 8 is not disconnected from the electromechanical manipulator (see figure 4) as follows.

The housing 9 with the bundle of fuel rods 8, together with the collet 11 and the sleeve 13 on the ampoule body 9 is held by the inner shoulders 18 of the collet 11, by the chamfer 10 of the housing 9 of the ampoule 7, moves down to the stop of the inner shoulders 17 of the collet 13 in the cover 6 of the ampoule 7 (hooked paws 4 capture 3 electromechanical manipulator 2). Next, the housing 9 of the ampoule 7 and the cover 6 of the ampoule 7 are held by the device 1 already proposed, and the electromechanical manipulator 2 is also placed in the cell of the storage case (not shown in the drawing).

Claims (2)

1. A safety device for overloading ampoules with bundles of spent fuel elements, consisting of a collet equipped with petals, at the ends of which external and internal stops are made, and attached to it with the possibility of vertical movement and interaction when it is in the lower position with the petals of the sleeve collet, and in the upper part of the collet and the sleeve are provided with inner shoulders. 2. The device according to claim 1, characterized in that the connection and vertical movement of the sleeve along the collet is carried out by means of a bayonet connection, the length of its vertical groove being equal to the length of the petals of the collet.