FI83824C - Tightly lockable lock for protective covers at nuclear reactors - Google Patents

Description

1 83824

This invention relates to structures related to nuclear technology, and more particularly to hermetically sealable closures for the shields of nuclear reactors.

The present invention can be applied specifically to the formation of an airtight barrier in the protective jacket of nuclear power plants and for the operation of the operators under the protective-10 jacket of the nuclear reactor and for the transport of loads.

A variety of hermetically sealed closures have been proposed for the nuclear reactor shields.

In particular, an airtight closure for protective casings is known in the art (cf., for example, 15 inventors' certificate SU No. 654 791, cl. E04H 9/00, 1976), which comprises a frame with a floor and airtight doors with rotating door side devices with closing wedge devices. lizards. The closure body is provided with racks having wedge-shaped openings, and the closure wedge device comprises straight lines with rollers going to the wedge-shaped openings. Each rotating door half has a stop and a closing device is arranged inside the body of the closure, which is made as bars comprising a ball closure. One end of each rod is articulated to the door shaft and the other end is articulated to the door side stop.

However, with the previous closure, it is very difficult to guarantee adequate safety for the operators as they go under the containment of the combined reactor. Thus, for example, when the shutter door is open to the clean zone side of the shield, it is impossible for persons in the closed zone of the shield to enter the clean zone because the closed zone side door can be opened only when the shutter door on the clean zone side is closed. Therefore, this locking structure cannot control a door remote from 35 operators. This, in turn, poses a serious threat to nuclear power plants in the event of an emergency, in which case 2 83824 operating personnel would have to be rapidly transferred from under the nuclear reactor canopy to a clean zone.

One of the disadvantages of the previous closure is that the means of transport cannot be used to transfer loads by the time of use-5 kilos through the closure. This is again due to the fact that the floor of the lock is arranged below the level of the inner door and difficulties arise when the truck (vehicle) moves or has to carry the load by hand.

It is also known in the art to have an airtight closure for the sheaths of a nuclear reactor (cf., for example, the inventor's certificate SU No. 988 024, cl. E04H 9/00, 1981), which has a frame with a floor and an airtight door provided with a locking mechanism which is connected kinematically by means of a motion transfer mechanism to a control system-15 and compensating valves mounted on the closed and clean zone side.

Thanks to this previous locking structure, the locking door can be controlled away from the operator as both an automatic and manual control method.

20 One of the disadvantages of this barrier is that the means of transport cannot be used to transport loads by the occupants through the barrier because the floor is made below the level of the inner door.

. . In addition, it should be noted that the lock is not reliable enough, because when using the remote control of the inner door, some elements of the lock control system may break if a load or other object is in the opening area of the inner door inside the lock. In addition, the presence of operators in the opening area of the inner door:: can cause injury to the user, which reduces the safety of the operators as they enter: through the lock.

It is an object of the present invention to eliminate the above-mentioned disadvantages of hermetically sealed closures of nuclear reactor sheaths.

The present invention seeks to provide an airtight closure for a nuclear reactor enclosure, the floor structure of which enables the use of means of transport to carry loads when the occupants pass through the closure in a nuclear power plant under normal and emergency conditions, and increases operator safety.

According to the invention, this is achieved in that the hermetically sealed closure of the nuclear reactor enclosures 10, which has a body, a floor, an airtight outer door and an airtight inner door with a locking mechanism kinematically connected to the closure control system and compensating valves, has a fixed part and a vertically movable part, the latter is mounted by means of spring-loaded levers of a support frame-15 size fixed to the lock frame and provided with a lifting mechanism designed as a rod connected to the levers and provided with a stop contacting the inner door half, the movable part comprising a detector associated with the inner door locking mechanism .

This airtight lock design allows the means of transport to be used to transport loads when the operators pass through the lock and increases their safety at the nuclear power plant in both normal and emergency conditions.

The main features of the proposed invention are set out below.

When the floor is manufactured as an integral part, which is installed flush with the door sill sill support part on the air side of the outer door, and as a movable part arranged under the airtight inner door half, the doors can be - closed and transported inside the lock by the outer door. open when operators pass through the lock.

Since the movable part is able to move in the vertical direction when the inner door of the shutter is open, the nipple support part of the inner door opening and the fixed part of the floor are brought into the same plane so that the conveying means can move to the clean zone of the shutter through the inner door opening.

When using a support frame attached to the shutter frame, the moving part of the floor can be positioned and adjusted more precisely.

Using spring-loaded levers, the floor movement-5 image part can be kept suspended. If, due to a load on the moving part of the floor or the operating persons, the moving part lowers, the position indicators associated with the locking mechanism will prevent the door from opening. This prevents damage to the elements of the lock control system when 10 loads or other objects are in the opening area of the inner door, increases the safety of the operators and makes the lock more reliable.

When the lifting mechanism for the moving part of the floor is made as a bar comprising a stopper connected to the levers at one end and in contact with the door half at the other end, the moving part works better in normal and emergency conditions of a nuclear power plant.

The application of the present invention increases the operability of the hermetically sealable closures of the protective jackets, guarantees the safety of the operators and the reliability of the closure in all operating conditions of nuclear power plants.

The invention will now be described in more detail as an example with reference to the accompanying drawings, in which Figure 1 is a plan view hermetically closable melt "25 schedules, and Figure 2 is drawn in the floor shown in Figure 1 of the movable portion in the direction of arrow A.

The airtight closure has a frame 1 (Fig. 1) with a floor 2 and an airtight inner door 3 and an airtight outer door 4 provided with a locking mechanism 5.

The floor comprises a fixed part 6 and a vertical movement. Figure 7 (work bridge). The movable part 7 is mounted on a support frame 8 using levers 9 (Fig. 2), which are connected to supports 11 for springs 10, and provided with a lifting mechanism. The lifting mechanism is a rod 12 which is articulated to the levers 9 and contacts the inner door half 3 via its stop 13. The support frame 8 is fixed to the frame 1.

5,83824

Doors 3 and 4 (Fig. 1) are mounted on the side walls of the shutter body 1 (door 3 is on the clean zone side and door 4 is on the closed zone side) and move by means of a control system with electric drive 14, two transmission units 15 and 16 and motion transfer mechanisms 17 and 18. The control system also comprises three control tables (not shown in the drawing) located inside the lock on the clean zone side and the closed zone side. In addition, the lock has the possibility of manual steering by means of handwheels 10 (not shown in the drawing) located close to the control table. The side walls of the barrier have compensating valves 19 which are kinematically connected to the barrier control system. The movable part 7 of the floor 2 is provided with detectors 20 for checking its position. The detectors are placed in the support frame 8 and connected to the lock control system by means of the locking mechanism 5 of the door 3.

The hermetically sealed closure works as follows.

In the rest position, the movable part 7 of the floor 2 (work bridge) is below the level of the door 3. Operators come to the closed zone 20 from the clean zone side. Both doors 3 and 4 are closed and airtight. To access the inside of the lock, a "input" button must be pressed, located on a control table arranged on the entry side. In this case, the electric drive 14 starts. The movement is transmitted through the intermediate unit 16 to the movement transfer mechanism 18, which drives the locking mechanism 5 by means of the pressure equalization valve of the door 3. Door 3 opens. When the door 3 opens, its half contacts the stop 13 of the bar 12, the working bridge rises up to the level of the fixed part 6 of the floor 2 and the door support part of the door 3 and 30 settles into its working position. Operators enter the lock inside. Closing the door 3, sealing it and closing the pressure relief valve takes place in the reverse order by pressing the "exit from closing" button. In this case, the closing door half 3 comes into contact with the working bridge, 35 and the bridge moves down to its rest position. Thereafter, when the "exit from lock" button is pressed, the rotational movement of the electric actuator is transmitted through the transmission unit 15 to the movement transfer mechanism 17 83824, which actuates the locking mechanism 5 by means of the pressure equalizing valve 19 of the door 4, and the door 4 opens. Operators leave the lock to a closed zone. Closing the door 4, sealing it and closing the pressure relief valve 19 5 takes place in the reverse order by pressing the "door closed" button on the control zone of the closed zone.

In the rest position, i.e. in the lowered position, the movable part 7 of the floor 2 remains suspended. If the work bridge 10 has a load or actuators so that the bridge lowers, the position check indicators 20 connected to the control system and the locking mechanism 5 will not allow the door 3 to open. In addition, the spring 10 reduces the force required to lift the work bridge.

15 In contrast to previous closures, the now proposed closure closure of the reactor shields of the core reactors increases their operability without compromising the reliability of the closure under different operating conditions.

Claims (1)

An airtight closure for the containment shells of nuclear reactors, comprising a body (1), a floor (2), an air-tight outer door (4) and an airtight inner door (3) with a locking mechanism (5) which is kinematically connected shut-off control system and compensating valves (19), characterized in that the floor (2) has a fixed part (6) and a vertically movable part (7) mounted on a support frame (8) fixed to the gutter body (1) by means of spring-loaded levers ( 9) and provided with a lifting mechanism made as a rod (12) connected to the levers (9) and in contact with the inner door half (3) by its stop (13), the floor moving part (7) comprising a detector (20) for checking its position, associated with the locking mechanism (5) of the inner door (3). 8 83824 Tillslutningsbar sluss fiat skshdshöljen för reactor, vilken sluss innefattar ett hus (1), en 5 golvbeläggning (2), inner- octterdörrar (3 respekt- tive 4) med en läsmekanism (5), vilken mekanism f mediken f fertiskt f that the system for the construction of the locks and the locomotive valve (19), the transverse operation of the locks (2) 10 is fitted with the locks (6) and the vertical locks (7), the colors of the locks and the anchor en stödram (8) medelst destrstänger (9), vilken stödramen (8) är fästad account slussens hus (1), och försedd med en lyftmekanism i form av en med destr-15 stängerna (9) förbunden dragstäng (12) med ett anslag (13), a single contact with the inner tube (3), a color of the inner tube (7), from the graft (2) is used with the inner tube (20), the stringed tube with the inner tube (3), the loop mechanism 20 (5) .