RU204339U1 - LOCALIZING SECURITY SYSTEM TRANSPORT GATEWAY OF A NUCLEAR POWER PLANT WITH A PLANE-PARALLEL WATER LOCK - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, namely, to nuclear power, in particular, to equipment installed in the containment shells of a nuclear reactor. A transport lock for the localizing safety system of a nuclear power plant with a plane-parallel shutter of canvases, consisting of a body, a drive, canvases, and the design uses canvases, the perimeter of which is divided into two equal sectors. One of the sectors is characterized by the presence of a spike along the perimeter of the web, which engages with the counter-locking part of the shutter located on the body flange, and the other is characterized by the presence of a counter-locking part of the plane-parallel shutter, which engages with the spike located on the body flange. The utility model provides a hermetic overlap of the transport openings of the localizing safety system of an operating nuclear power plant and the transportation of cargo and equipment with large dimensions through the lock. 3 C.p. f-ly, 1 dwg.

Description

The utility model relates to the field of mechanical engineering, namely, to nuclear power, in particular, to equipment installed in the containment shells of a nuclear reactor, which ensures hermetic overlap of transport openings of the localizing security system of an operating nuclear power plant and transportation through the lock of transport cargo and equipment with large dimensions.

The transport gateway (Gateway) is an element of the hermetic enclosure system, which is part of the localizing safety system (LSS) of a nuclear power plant (NPP). The sluice is built into the building structure of a sealed enclosure and is part of the equipment of the transport portal of the reactor compartment. During operation, the gateway performs the following functions:

- preservation of the design tightness of the sealed enclosure under normal operating conditions and emergency situations.

- protection from external influences of the environment of systems and components, the failure of which can lead to an unacceptable release of radioactive substances.

- ensuring the transportation through the lock while maintaining the tightness of the hermetically sealed enclosure (sluice) of fresh fuel in canisters, spent fuel in containers, radioactive waste in containers, transport and technological equipment, devices and devices for technological maintenance and repair, repaired equipment and its assemblies, materials, spare parts.

- provision of fire protection, as well as the tightness of the hermetically sealed enclosure and intershell space during a fire and after the passage of a fire.

The design of the gateway of the transport localizing safety system of a nuclear power plant with a bayonet lock is known according to patent RU180665 dated 01/17/2018 (Transport lock of the localizing safety system of a nuclear power plant with a bayonet lock, G21F 7/005, publ. 06/20/2018), in which the locking mechanism of the opening the lock is made in the form of a bayonet lock, consisting of a cloth in the form of a torispherical or elliptical cover, with a toothed rim along the outer diameter and a bayonet swivel ring with a toothed rim along the inner diameter, and the tightness of the transport lock is ensured by means of a retractable double-circuit rubber seal located in the grooves on the end of the body of the transport lock along the entire perimeter of the opening, and both liquid and gases can be used as a working fluid to create excess pressure.

The disadvantage of this design is the use of a bayonet shutter, which leads to the presence of at least one intermediate part (bayonet ring), high complexity of parts manufacturing (outer gear rim on the lid and inner gear rim on the bayonet ring, a particular difficulty is observed in the manufacture of the second), the need to use an additional mechanism or mechanical links of existing mechanisms that implement locking the bayonet shutter by turning the bayonet ring or cover. Moreover, in the case of using a one-piece bayonet ring, there is a need to use a split intermediate ring, which is installed between the ring and the body and is an element through which the working load is transmitted. An alternative option in the case of using a one-piece bayonet ring is the additional gearing of the body and the ring, which greatly complicates the process of making the ring, and also determines the need to manufacture a gear rim on the sluice body.

The objective of the claimed utility model is to develop a transport lock design that differs from the existing ones in simplicity and efficiency, a decrease in the number of assembly units and actuators, a decrease in the time required for the lock process, and an increase in reliability within the framework of ensuring a given level of tightness.

The technical result of the claimed utility model is the creation of a transport gateway that provides a given level of tightness based on the average daily leakage of the medium, a decrease in the number of structural components and power units, a decrease in lock time and an increase in the reliability of NPP operation.

The technical result is achieved through the use of a gateway of the transport localizing safety system of a nuclear power plant with a plane-parallel shutter of canvases, including canvases, the perimeter of which is divided into two equal sectors, symmetric relative to a plane perpendicular to the direction of the web withdrawal, one of which is characterized by the presence of a spike along the perimeter of the web, engaging with the counter-locking part of the shutter located on the body flange, and the other is characterized by the presence of the counter-locking part of the plane-parallel shutter, which engages with a spike located on the body flange.

In this case, the tightness of the lock of the transport from the localizing safety system of the nuclear power plant with a parallel-plane shutter of the cloths is ensured by means of a retractable double-circuit rubber seal located in the grooves on the end of the lock body along the entire perimeter of the opening. Both liquid and gases can be used as a working fluid to create excess pressure in the cavities under the seals.

In this case, retractable rubber seals can be installed both in the grooves on the lock body and in the grooves on the canvas.

In this case, the axial clearances in the joint should not exceed the working stroke of the retractable rubber seals.

In this case, retractable rubber seals can be replaced with static ones, provided that chamfers are made on the working surfaces of the plane-parallel valve, which provide the necessary pressing force when the valve is locked.

In this case, static rubber seals can be installed both in the grooves on the lock body and in the grooves on the canvas.

In this case, there is a hydraulic or other (pneumatic, electric) type drive, which ensures the movement of the web along a given trajectory.

In this case, both a flat canvas and an elliptical, torispherical or other shape can be used, providing the presence of at least one axis of symmetry.

At the same time, it is possible to use a redundant manual drive to implement the sluice process in manual mode.

In this case, the counterpart of the shutter and the key can be made as integral with the body flange, and there are mechanical fasteners, as well as fasteners of a different type.

The essence of the proposed utility model is illustrated by drawings:

FIG. 1 - The design of the plane-parallel gate of the gateway of the transport localizing safety system of the NPP

The transport lock of the NPP localizing safety system with a plane-parallel shutter of the canvases includes:

1 - Gateway housing flange;

2 - Cloth;

3 - Thorn of the canvas;

4 - Mating fixing part of the curtain shutter;

5 - Hull spike;

6 - Mating fixing part of the body shutter;

7 - Retractable rubber seals;

8 - Channels for supplying the medium under pressure.

FIG. 1 shows the blade 2 in the locked state of the parallel-plane shutter, when the blade of the blade 3 is in engagement with the counter-locking part of the shutter of the body 6, and the spike of the body 5 is respectively engaged with the counter-locking part of the shutter of the blade 4. In this case, the existing gaps in the connection are eliminated by supplying the medium under pressure through the channels 8 in the cavity under the retractable rubber seals 7.

During the opening, the web 2 moves relative to the flange of the housing 1 to the right in such a way that the thorns of the housing and the web disengage with their corresponding counter-locking parts of the shutter. In this case, before the process of removing the web, it is necessary to relieve the pressure from the cavities under the retractable rubber seals 7.

Claims (4)

1. A transport lock for the localizing safety system of a nuclear power plant with a plane-parallel shutter of cloths, consisting of a body, a drive, cloths, characterized in that a cloth is used in the structure, the perimeter of which is divided into two equal sectors, symmetric with respect to a plane perpendicular to the direction of withdrawal of the cloth, one of which is characterized by the presence of a spike along the perimeter of the web, which engages with the counter-locking part of the shutter located on the body flange, and the other is characterized by the presence of the counter-locking part of the plane-parallel shutter, which engages with the spike located on the body flange, while the tightness of the cloths provided with the help of a retractable double-circuit rubber seal located in the grooves on the end of the lock body along the entire perimeter of the opening, and both liquid and gas can be used as a working fluid to create excess pressure in the cavities under the seals. 2. A transport lock for the localizing safety system of a nuclear power plant with a parallel-plane shutter of the cloths according to claim 1, characterized in that the retractable rubber seals are installed in the grooves on the cloth. 3. Transport lock of the localizing safety system of a nuclear power plant with a parallel-plane shutter according to claim 1, characterized in that static rubber seals are used, installed in the grooves on the body flange, provided that chamfers are made on the working surfaces of the plane-parallel shutter, providing the required force pressing when locking the shutter. 4. A transport lock for the localizing safety system of a nuclear power plant with a parallel-plane shutter of the cloths according to claim 3, characterized in that the static rubber seals are installed in the grooves on the cloth.

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