RU2444797C1 - Transmitting device - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: invention refers to devices for installation of cases containing spent fuel assemblies (SFA) to spent nuclear fuel storages and can be used at nuclear power plants or special mills for utilisation of SFA of nuclear reactors. Transmitting device includes housing with bottom in the form of shielding plug. The latter is equipped with traverse for its being fixed on hoisting mechanism and slots for orientation during its installation into storage seat. Device is equipped with a fork with projections for pickup of clamps, an opening for fork arrangement, horizontal and vertical fork movement mechanisms, a pin entering the fork hole with possibility of fixing the clamp at movement, and with slide bearings. Slots of shielding plug are vertical. Slide bearings are made in the form of sleeves.

EFFECT: invention allows simplifying the guiding process of the device to installation places of SFA cases due to orientation slots made on shielding plug.

5 cl, 5 dwg

Description

This invention relates to the field of nuclear engineering, in particular, to devices for installing spent fuel assembly assemblies (SFAs) in spent nuclear fuel storage facilities, and can be used in nuclear power plants or special plants for the disposal of SFAs for nuclear reactors.

Spent fuel assemblies (SFA) of nuclear reactors intended for disposal are subject to long exposure in protective environments using the device of their installation for placement in the spent nuclear fuel storage (storage). The storage is made in the form of a holding pool with a bearing protective overlap, which is a flooring equipped with round openings-nests for storage. To perform the operations of installing canisters with SFAs and densely packed them in storage, it became necessary to use a self-propelled protective device (transmitting device), characterized by ease of maintenance and safe operation.

Known equipment for reloading fuel in reactors (A.D. Wardswater Technique for working with nuclear fuel. - M .: Atomizdat - 1965 - 90 s., 217 s., 229 s.), In particular, the ship "Savannah", including a rotary screen with a drive and a reloading container, in which lifts and grips for refueling are placed. When overloaded, the container is mounted on a rotating protective plate, which is installed on the reactor vessel after removing the cover. Fuel assemblies are replaced through loading tubes passing through the top guard. Such pipes are installed above each fuel channel. In this case, the assembly has a hanging section, which passes through the pipe in protection and hermetically closes the upper hole of the pipe. It is known that the assembly is carried over by the gripper. To simplify the grip design, assembly orientation devices are mounted on the assemblies themselves.

The disadvantage of the analogue is that the design of the equipment for refueling fuel is complex, its use to carry out the process will require a long time and laboriousness when installing the SFA in the storage.

Known storage facility for spent nuclear fuel located on the Lepse vessel’s floating technical base, which contains a compartment with two storages, covered with a protective plate made with round loading openings, in particular for placement of SFAs, and equipped with protective plugs for the loading opening (Journal) Nuclear Technology Abroad ", 1997, No. 3, p.20-21).

The disadvantage is that it is difficult to implement the compacted placement of canisters with SFA in the channels of the storage tank, the complexity of the process of pointing the device to the installation sites of canisters with SFA in the storage and orientation of the cork.

A device for storing spent nuclear fuel (patent RU No. 2234151, G21C 19/06, G21F 9/34, publ. 2004) is known, according to which the device located in the pool filled with water contains a two-arm beam pivotally mounted on the slit beams, carrying fuel canisters. The device is equipped with a safety device with a screw coupler and load gripping elements.

A repository for spent nuclear fuel is known (patent SU No. 1405584 G21F 9/00, publ. 1995), according to which it contains a water basin, a slit overlap formed by I-beams, pencil cases based on the upper shelves of I-beams, equipped with load gripping elements, however, the storehouse contains additional canisters, staggered relative to the main canisters, with brackets, resting on the lower shelves of I-beams, equipped with load-gripping elements and suspensions.

The disadvantage of these analogues is that the installation of canisters with SFAs in the repository is a long-term process using a crane of the central hall and the exclusion of work in the area served by the crane of the central hall, in addition, with slotted overlap, there may be a decrease in safety for maintenance personnel.

An object of the invention is to develop a design of a device transmitting small dimensions and masses for compacted arrangement of load-bearing elements of canisters with SFAs in each storage slot, excluding from the operations of installing canisters with SFAs in storages the crane of the central hall and allowing work to be carried out in an area not serviced by the crane the central hall, providing a simplification of the process of pointing the device, reducing operating time, improving radiation safety.

This problem is solved in that the transmitting device contains a housing with a base in the form of a protective plug, according to the invention, the protective plug is equipped with a traverse for fixing it on the lift (load-lifting mechanism) and grooves for orientation when it is installed in the hole of the storage slot, the device is equipped with a plug, a window for placement of the fork, the mechanisms of horizontal and vertical movement of the fork, a finger entering the hole of the fork, with the possibility of fixing the bracket when moving, sliding bearings.

It is advisable to provide a fork with tabs for gripping the brackets.

It is preferable to provide mechanisms for horizontal and vertical movement of the fork with squares for control.

Preferably, the grooves of the protective plug are vertical.

It is advisable to make bearings in the form of bushings.

When using the invention, the following technical results may occur, in particular:

- simplification of the process of pointing the device to the installation sites of canisters with SFA in the storage (in combination with storage sockets) and orientation of the cork;

- reducing the time spent on installing canisters with SFA in the storage;

- compact placement of cases with SFA;

- the exception of the fall of the canisters from the SFA when they are placed;

- increase safety at work;

- exclusion from operations for the installation of SFA in the storage facilities of the crane of the central hall and work in the area not serviced by the crane of the central hall;

- improvement of radiation safety during storage of canisters with SFA of nuclear reactors.

The technical result of simplifying the process of pointing the device to the installation sites of canisters with SFAs in storage is provided by grooves for orientation made on the protective plug included in the base of the device and, as a result, reducing working time.

The compactness of the placement of canisters with SFAs is achieved due to the compacted arrangement of the supporting elements of the canisters with SFAs in the amount of, for example, six pieces on the periphery of the storage slot opening and under the deck of plates, while leaving free space in the central part of the storage slot opening.

The exclusion of the possibility of falling of the case with the SFA is realized by fixing the bracket when interacting with the elements of the socket, in particular with three fingers mounted on the ring and three pins securing this ring in the bore of the storage slot, and simultaneously interacting with the finger mounted on the cradle, with hole in the bracket or with the hole of the plug when lifting.

The manufacture of a device transmitting small dimensions and mass, which is easy to maintain, makes it possible to carry out technological operations with it using a manually operated and manually lifted elevator (lifting device), which allows the central hall crane to be excluded from operations for installing SFAs in storage facilities and to carry out work in the area not served by the crane of the central hall.

Improving the safety of work is ensured by controlling the device mechanically transmitting using extension cords (or remotely), torque wrenches connected to the control squares of the mechanisms of horizontal and vertical movement of the plug, located on the upper surface of the protective plug.

The invention is illustrated by drawings, presented in figure 1 ÷ 5:

figure 1 - General view of the storage sockets;

figure 2 - installation of the bracket on the storage slot - view A (figure 1);

figure 3 - installation of brackets and rings on the storage slot - view B (figure 1);

4 is a General view of the transmitting device;

figure 5 - the nodes of the movement of the transmitting device is a view In (figure 4).

The transmitting device 1 (figure 4) contains a housing with a base, which is a protective plug 2, provided with grooves 3, a window 4 and a crossarm 5 mounted on racks 6 and designed to secure the protective plug 2 on the lifting mechanism.

The grooves 3 of the protective plug 2 (Fig. 4) are made vertical with the possibility of orienting the protective plug 2 along the elements of the socket when it is installed in the hole 26 — the storage socket (Fig. 1), which provides unambiguous guidance of the transmitting device 1 to the installation sites of the carrying elements of the canisters with SFA, as a result, reduced working time. In addition, the protective plug 2 provides increased radiation safety from the shooting of other openings from other storage sockets in the storage, reducing radiation doses for maintenance personnel and improving operational safety.

In the window 4 (Figs. 4, 5), the fork 7 is arranged with vertical and horizontal movement, provided with protrusions 8 for picking up the supporting elements made in the form of brackets 9.

The mechanism for the vertical movement of the plug 7 (Figs. 4, 5) includes a square 10, connected by a bevel gear 11, with a nut 12, which can be moved on the shaft in the form of a screw 13 mounted on a spider 14, which moves along the guide 15.

The mechanism of horizontal movement of the plug 7 (Figs. 4, 5) includes a square 16, connected by a cylindrical gear 17, with a shaft in the form of a screw 18, mounted in sliding bearings 25, made in the form of bushings, a creep 14 with a nut 19 installed in it which is moved from the rotation of the screw 18 and drives the creep 14, while its movement is limited by the stop 24.

In the creep 14 (Figs. 4, 5), using the holder 21, a finger 22 is installed, which enters the hole 23 of the plug 7 when lifting, with the possibility of fixing the brackets when moving and eliminating the possibility of the canister falling from the SFA.

Squares 10 and 16 (figure 4) of the control mechanisms of the vertical and horizontal movement of the plug 7, respectively, are located on the upper surface of the protective plug 2 with the ability to control the device transmitting using extension cords (or remotely), torque wrenches, providing increased safety.

The storage slot (FIGS. 1, 2, 3) has an opening 26 (a storage slot opening) made in a flooring of plates 27 located above the exposure pool and is closed by a protective stopper (not shown) and a cover (not shown). A ring 29 is located in the bore 28 of the opening 26 - of the storage slot, secured with, for example, three pins 30. Three fingers 31 are mounted on the ring 29, for example, supporting elements made in the form of a staple 9 sec. holes 32 (for interacting with pin 30 or finger 31) to exclude the possibility of falling of the case with SFA and the heads 33 mounted on the brackets. The heads 33 are used to secure the cases with SFA 34. The brackets 9 are fixed with nuts 35. Staples 9 (Fig. 1) equipped with shoulders 36 for cotton staples 9 and removing them from the storage slot.

The work of removing the brackets from the storage slot is as follows.

Remove the cover from the hole 26 - storage slot. The nut 35 is removed from the bracket 9 to be removed and a protective plug (not shown) is removed from the hole 26, the storage slot, using a lift.

Then the device transmitting with the help of (lifting device) lift is lowered into the hole 26 - storage slot. The transmitting device is made of small dimensions and mass with the ability to control and move the lift using extension cords or remotely, which eliminates the central hall crane from the installation of SFAs in the spent nuclear fuel storage facility and works in the area not serviced by the central hall crane.

In the initial position, the plug 7 is in the lowest position, the creep 14 is in the extreme right position, the device transmitting the bracket 9 to be removed is produced by the interaction of the grooves 3 of the protective plug 2 and the remaining brackets 9 located in the hole 26 - the storage slot.

The vertical movement of the plug 7 is carried out by rotating the square 10, connected by a bevel gear 11 with the nut 12. The nut 12, moving along the screw 13 mounted on the sprocket 14, moves the fork 7 by means of rods.

The horizontal movement of the plug 7 is carried out by rotating the square 16, connected through a cylindrical gear 17 with the screw 18. The screw 18 makes the nut 19 installed in the sprocket 14 move, thereby causing the sprocket 14 (and the associated plug 7) to move along the guides 20, while the amount of movement of the crawler 14 is limited by the stops 24.

By rotating the square 16 with the help of extension cords (or remotely), torque wrenches, increasing the safety of operation, the sprocket 14 is moved to its leftmost position until it stops 24, while the protrusions 8 of the plug 7 extend under the shoulders 36 of the bracket 9.

Then, by rotating the square 10 with the help of extension cords (or remotely), torque wrenches, increasing the safety of work, the fork 7 is moved to its highest position, while the protrusions 8 of the fork 7, interacting with the shoulders 36 of the bracket 9, raise the bracket 9 to a height, necessary for the pin 30 or finger 31 to exit from the hole 32 of the bracket 9, removing it from the pin 30 or the finger 31. At the same time, the finger 22 enters the hole 32 of the bracket 9 and fixes it, eliminating the possibility of the canister falling from the SFA.

Then, by rotating the square 16, the slider 14 is moved to the extreme right position, bringing the removable bracket 9 to the center of the hole 26 - the storage slot.

The transmitting device with the bracket 9 fixed to it is removed (removed) from the hole 26 - the storage slot.

With the help of a lift, a protective plug (not shown) of the hole 26 - the storage slot is installed.

Then install the nut 35 securing the bracket 9 and install the cover of the hole 26 - storage slot (not shown).

The work of installing brackets in a storage slot with a case attached to them with a SFA is performed as follows.

The case with SFA 34 is suspended along the axis of the hole 26 - storage nests on split leaves (not shown) (delivery and lowering of SFAs on split leaves is done by a reloading machine).

A bracket 9 is hung and fixed on the transmitting device, previously removed from the hole 26 — the storage slot, while the shoulders 36 of the bracket 9 lie on the protrusions 8 of the fork 7, the fork 7 is in its highest position, and the finger 22 is inserted into the hole 32 of the bracket 9, the crawler 24 is in the extreme right position.

Then, the bracket 9 is connected to the head of the SFA using the tip 33. The transmitting device (with a case attached to it with the SFA) is lifted above the sash using a lifting device to the extent that the sash can be opened, and the amount of lift can be determined by the rigid stop of the lift. Sashes open manually.

Then the transmitting device is lowered into the hole 26 - the storage slot, orienting it according to the brackets installed in the storage slot, which eliminates the possibility of damage to the brackets 9 and the SFA canisters located in the storage slot.

Then, by rotating the square 16, the spider 14 is moved to its leftmost position until it stops 24, ensuring that the holes 32 of the bracket 9 and the corresponding pin 30 or finger 31 are aligned with each other due to the mutual orientation of the storage device relative to the storage slot elements.

Then, by rotating the square 10, the plug 7 is moved to its lowest position, while the bracket 9 is put on the pin 30 or the finger 31, while the finger 22 comes out of the hole 32 of the bracket 9, eliminating the possibility of the canister falling from the SFA.

Then, by rotating the square 16, the slider 14 is moved to the leftmost position until it stops 24.

The transmitting device is removed from the hole 26 - storage slot and load the remaining peripheral cells of the hole 26 - storage slot. Thus, a compacted arrangement of the supporting elements of the canisters with SFAs is achieved in the amount of, for example, six pieces on the periphery of the opening 26 — the storage slots and under the deck of plates, leaving free space in the central part of the opening 26 — the storage slots, and realizing the compactness of the placement of canisters with the SFA

With the help of a lift, a protective plug (not shown) is installed in the hole 26 of the storage slot, with a case attached to it with a SFA using the tip 33.

Claims (4)

1. The transmitting device, comprising a housing with a base in the form of a protective plug, characterized in that the protective plug is equipped with a traverse for fixing it on the lift (load-lifting mechanism) and grooves for orientation when it is installed in the storage slot, the device is equipped with a fork with tabs for picking up staples , a window for placing the fork, mechanisms for horizontal and vertical movement of the fork, a finger entering the hole of the fork, with the possibility of fixing the bracket when moving, sliding bearings.
2 The transmitting device according to claim 1, characterized in that the plug is provided with protrusions for gripping the brackets. 3. The transmitting device according to claim 1, characterized in that the mechanisms of horizontal and vertical movement of the plug are provided with squares for control. 4. The transmitting device according to claim 1, characterized in that the grooves of the protective plug are made vertical. 5. The transmitting device according to claim 1, characterized in that the bearings are made in the form of bushings.

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