RU2580520C1 - Device for transportation of removable block - Google Patents

Abstract

FIELD: nuclear engineering.

SUBSTANCE: invention relates to nuclear engineering, particularly to handling equipment and may be used for transfer of radioactive products in a nuclear reactor with liquid metal coolant as device for providing transfer. Multi-level design of tool for transporting removable unit is a frame structure welded on supports with elements of fastening/unfastening removable unit with capture and handling suit, which allows docking and engagement with force and pivoting unit of removable pins.

EFFECT: technical result is broader technological capabilities of handling equipment.

1 cl, 7 dwg

Description

The invention relates to nuclear technology, namely to lifting and handling equipment, and can be used to reload radioactive products in a nuclear reactor with a liquid metal coolant as a transport device for loading, controlling a unit withdrawn in a reactor monoblock (ICBM) and unloading it from ICBMs.

After decommissioning of the reactor monoblock for overloading the elements of the reactor core with a heavy liquid metal coolant, it is necessary, taking into account the conditions of nuclear and radiation safety, to carry out technological operations to load the removable unit with fresh fuel assemblies (STFS) in ICBMs and unload the removable unit without spent fuel assemblies ( SFA) from ICBMs to the mine. A feature of the overload process of the extractor unit is that the equipment operates under a layer of liquid metal coolant and the process passes under the influence of a significant buoyancy force of a heavy liquid metal coolant due to its high density, which exceeds the density of the material (steel) from which the equipment and the transportation device are made. In this case, it is necessary to take into account the effect of high temperatures of a heavy liquid metal coolant and a high degree of radioactive contamination of the extracted equipment.

Given that low-power reactor plants with fast reactors cooled by liquid metal lead-bismuth coolant (CBT) using the modular principle of building a power unit, in particular, such as a lead-bismuth fast reactor of the SVBR type, are pilot in the implementation of large-scale high-tech in the nuclear industry projects, then analogues of the device for transporting a removable unit for the same purpose, for the technical nature and for the achieved result when using it authors and the applicant has not identified.

The basis of the invention is the task of developing, with radiation safety, the design of the device for efficient and reliable transportation of the removable unit when it is loaded with overcoming the significant buoyancy of the coolant, as well as unloading.

To solve this problem, a multilevel design of a device for transporting a removable block (PTBV) is proposed, which is a plate on supports with fastening / unfastening elements with a removable and “fungus” block for coupling with a gripper overload suit, which allows docking and engagement with power and rotary pins of a removable block. PTBV consists of a frame formed by four plates with five columns passing through them, pickups designed to connect with power pins of a removable unit, and rotary mechanisms designed to contact the corresponding gripping elements of the transfer suit. In this case, the frame is a power structure designed to accommodate these mechanisms. Moreover, the pickups include three rods, and the rotary mechanism includes six rods. In addition, the rods have pivoting octagonal heads protruding above the top plate. The sockets of the bottom plate of the frame for pick-up rods are equipped with levers for connecting to the “fungi” of the power pins of the removable block, and for the rods of the swing mechanism, they are equipped with hex-head swivel heads for connecting with the hexagonal rotary pins of the draw-out block.

When using the claimed invention can be obtained, in particular, the following technical results:

- retention of a block removable from ascent in a liquid metal coolant;

- increase of reliability in work;

- improvement of nuclear and radiation safety;

- expansion of technological capabilities of handling equipment;

- the ability to control the elements of the detachment of the removable block in the ICBM case.

The technical result is achieved as follows.

The presence of "fungus" allows you to expand the use of grippers for goods with a central figured head.

The large margin of safety in the design of the PTBV allows to increase its reliability.

The removal of control mechanisms beyond the coolant can increase the reliability of the device.

The improvement of nuclear and radiation safety is facilitated by the formation of biological protection in the form of an upper powerful plate in the design of the PTBV.

The invention is illustrated by the drawings shown in FIG. 1-7:

FIG. 1 is a general view of a transfer suit with a PTBV and a removable unit;

FIG. 2 - design of PTBV;

FIG. 3 - element A (power pin), element B (rotary pin), element B (rod with an octagonal rotary head), element G (modified power pin);

FIG. 4 - the upper part of the design of the PTBV;

FIG. 5 is a view D in FIG. four;

FIG. 6 is a section EE in FIG. 5;

FIG. 7 - loading block taken from STVS in ICBMs.

PTBV 1 is a frame transitional structure, docked to the upper end of the removable unit 2 for performing transport operations with it through a complex of handling equipment (Figs. 1, 4 and 7), which includes a transfer suit 3 with a gripper 4, transition box 5 and guide channel 6 with installation plate 7.

PTBV 1 (Fig. 2 and 3) is a welded structure consisting of four horizontal plates 8, 9, 10 and 11 with five columns 12 passing through them, and is a power structure designed to accommodate mechanisms: pickups 13 for fixing on the block removable 2 with its power pins 14 and rotary mechanisms 15 for controlling the rotary studs 16 of the removable block 2.

Each pickup 13 (Fig. 2 and 3) consists of three levers 17, a rod 18, a long rod 19, a spindle 20, a nut 21 and an octagonal head 22. The bars 19 of the pickups 13 pass through all plates and have protruding above the top plate 8, octagonal heads 22, and in the sockets 23 of the lower plate 11, levers 17 for connecting with the “fungi” 24 of the power pins 14 (Fig. 3) of the removable block 2.

The pivoting mechanism 15 consists of a pivoting head 25 with an internal hexagon, in particular of a 41 mm turn-key size and external flats, a single hinged clutch 26, a disk clutch 27, a long rod 19 and an octagonal head 22. The rods 19 of the pivoting mechanisms 15 pass through all plates and have octagonal heads 22 protruding above the upper plate 8 and in the slots 28 of the lower plate 11, rotary heads 25 for connecting to the rotary pins 16 of the removable block 2. The octagonal heads 22, in particular, have a turnkey size of 30 mm and are intended They are suitable for contact with the corresponding gripping elements 4 of the transfer suit 3.

Pickups 13 in the amount of three and rotary mechanisms 15 in the amount of six are oriented strictly along the axes of the power 14 and rotary 16 hairpins of the removable block 2 and occupy the entire height of the PTBV 1.

PTBV 1 is equipped with a "fungus" 29 (Fig. 4), for the head of which, when lifting, the load-gripping gripping element 4 is fixed.

The sleeve 30 (Fig. 3 element B) belongs to the intermediate gearbox 31 (Fig. 5) located on the upper end of the grip 4. At the upper end of the grip 4 is located the gearbox 32 (Fig. 5).

Transitional box 5 is installed on the ICBM 33 case.

In the guide channel 6 there is an annular groove 34.

Using the output shafts 35 of the drive unit 36, engagement with the grommets 30 (Fig. 6) is carried out 4. The drive unit 36 is located on the generatrix of the guide channel 6.

In the particular case, when loading the removable unit 2 with the STVS into the ICBM 33, the operation of the PTBV is as follows (Fig. 7).

A fresh extractor unit 2 is assembled in a mine to assemble a removable unit. PTBV 1 is installed and fixed on a fresh block removable 2.

In this case, the pickups 13 and rotary mechanisms 15 work as follows.

Pickup 13 is a controlled mechanism. The levers 17, turning along their axes, close around the power pin 14 of the removable 2 unit and cover its “fungus” 24. The levers 17 are controlled from the rod 18. The rod 18, lowering, presses on the spherical ends of the levers 17 and they rotate, releasing the “fungus” 24 of the power pin 14. When moving upward, the stem 18 turns the levers 17 in the opposite direction. Closing of the levers 17 around the “fungus” 24 of the power pin 14. Due to the configuration of the rod 18, the levers 17 cannot spontaneously open (crank). The translational movement of the rod 18 receives from the lead screw 20, rigidly connected with it. The stroke of the rod 18 is limited by a stop, which at the same time prevents the lead screw 20 from turning. The nut 21 rotates and pushes the lead screw 20. The nut 21 receives rotation from the rod 19 with the octagonal head 22, which in turn is in contact with the octagonal sleeve 30 (Fig. 3 element B) of the gearbox 31.

The work of the rotary mechanisms 15. The rotary head 25 (Fig. 3) with an internal hexagon (turnkey size 41 mm) is joined with the hexagon of the rotary pin 16 of the locking mechanism of the removable unit 2. Possible distortions and displacements of their axes are compensated by reasonable clearances in the design, by a disk clutch 27 and a single hinged clutch 26. The listed structural elements are rigidly interconnected, with a rod 19 and an octagonal head 22 at its end. The octagonal head 22 receives a rotation by a calculated angle from the gearbox 32 (Fig. 5).

The gate (not shown) of the transition box 5 is closed and sealed.

Then, using a crane and a standard lifting beam, they are transported from a storage place in the central hall and a mounting plate 7 is installed in the opening at + 9,000 m and channel 6 is guided (Fig. 7). In this case, the channel guide 6 is aligned with the central hole of the transition box 5. The elements are installed and the joint is sealed between the transition box 5 and the channel guide 6.

In the room of the central hall, a reloading suit 3 is hung on the crane hook, transferred to the assembly shaft of a removable block with STVS and installed on the upper flange of the gate (not shown) of the mine. The crane hook from the reloading suit 3 is not undocked. Produce decompression of the gate of the transfer suit 3 and translate it into the open position. Depressurize and open the gate of the storage shaft of the removable block with STVS. The grip 4 is lowered to the position where it reaches the annular stop of the “fungus” 29 PTBV 1. The grip 4 engages with the “fungus” 29 PTBV 1. The grip 4 is moved at different speeds. Then they lift the gripper 4 with the heated PTBV 1 and the block 2 pulled out with STVS to the highest position of the overloading suit 3. Move the gate of the overloading suit 3 to the closed position and seal it. The transfer suit 3 is transferred to the reactor opening and installed on the upper end of the installation plate 7 without undocking the crane hook. Produce decompression of the gate of the transfer suit 3 and translate it into the open position. Connect the nozzles for supplying and discharging gaseous media to the reloading suit 3 and the channel guide 6. Turn on the suction of air from the total internal volume of the reloading suit 3 and the channel guide 6. Fill the reloading suit 3 with inert gas. Unpack and open the gate of the transitional box 5. Lower the gripper 4 with the PTBV 1 and with the removable block 2 with the STVS to the lowermost position until it is firmly supported by its lower end in the annular groove 34 (Fig. 4) of the guide channel 6.

The output shafts 35 of the drive unit 36 are coupled to the gripper 4 (not shown) by turning six fastening locks (segments) (not shown) of the removable unit 2 using actuators 32 located on the upper end of the gripper 4. The removable unit 2 is fixed in the ICBM case 33 to prevent it from floating due to buoyancy. Three rods 19 are rotated, controlling the grips 13, until contact with the power pins 14 of the drawer unit 2 is removed. The output shafts 35 of the drive unit 36 are undocked from the gripping bushings 30.

Raise the gripper 4 with PTBV 1 (without the removable block 2) to the intermediate position (above the melt mirror) for the SVT to drain off and maintain PTBV 1 in this position for 30 ± 5 minutes. Then, the gripper 4 is lifted from the PTBV 1 to the highest position of the transfer suit 3. The gate of the transfer suit 3 is moved to the closed position and it is sealed. Transfer the gate of the transitional box 5 to the closed position and seal it. Through the nozzles for filling and exhausting the gaseous media of the channel of the guide 6, the contaminated gaseous medium is removed from its internal space with replacing it with clean air of the reactor box. Using a crane, a reloading suit 3 is transported from the loading point of the take-out unit 2 (from the opening of the reactor box) in the central hall and installed at the standard storage location, after unloading the PTBV 1 into the shaft for decontamination.

Thus, the PTBV designed for fastening / unfastening on the removable unit and coupling with the capture of the transfer suit allows efficient and reliable transportation of the removable unit with STVS for installation in ICBMs.

Claims (1)

A device for transporting a removable unit, characterized in that it consists of a welded structure formed by four plates with five columns passing through them, pickups designed to connect to the power studs of the removable unit, and rotary mechanisms designed to contact the corresponding gripping elements of the overload spacesuit, while the welded structure is a power structure designed to accommodate these mechanisms, and the grips include three rods, and The mechanism includes six rods, moreover, the rods have octagonal heads protruding above the upper plate, and, in addition, the sockets of the lower plate of the frame for pickup rods are equipped with levers for connecting with the “fungi” of the power pins of the removable block, and for the rods of the rotary mechanism swivel heads for connection with swivel pins of a removable block.

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