JPS581A - Mechanism positioning device and remote mounting method for said device - Google Patents

Abstract

A device for positioning a member, such as a guide tube, so as to face the perforations of a plate. The device comprises a remotely fitted attachment finger, using for this purpose e.g. a pole onto which is threaded the remainder of the device. A remotely controlled locking system makes it possible to fix the two parts, each incorporating at least one attachment member and which can be fixed in a perforation. These displacements of the device, following the fitting thereof, are also remotely controlled. The device can be applied, to the inspection of the tubes of a steam generator of a nuclear power station by means of an eddy current probe or sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mechanism positioning device for each hole in a grate drilled in a given grate, and a device for remotely attaching and detaching such a device. It is about the method.

In other words, the present invention provides a guide tube for each tube of a steam generator installed in a nuclear power plant, in order to introduce a quantity control device for each of the seven current probes into each tube of the steam generator. The present invention relates to a positioning device.

The tubes of steam generators installed in nuclear power plants are subject to particularly stringent procedures in which the condition of these tubes is periodically inspected in order to correct the use of damaged tubes that block their ends. Known to be subject to conditions. In order to carry out this inspection, it is necessary to be able to arrange an automatic device that can be introduced into the water tank of the steam generator and can be controlled from the outside. In fact, because the aquarium is intensely irradiated, and for the slightest reason, it is desirable to reduce human interference inside the aquarium as much as possible and to likewise, if possible, suppress it, for similar reasons. To,
It will be appreciated that Jin's device should also be particularly reliable and allow inspection of the entire tube without the need for manual intervention.

Moreover, similar requirements make it particularly desirable to implement a far F4 attachable and detachable device.

In short, the means for ensuring the movement of the equipment in the water tank P3 part of the steam generator must allow for the skipping of one or more tubes if necessary. In fact, the closed end of the barred tube prohibits the use of corresponding perforations in the plate to ensure transfer of the device.

A vertical tube comprising two vertical arms with independent coupling mechanisms in the ends of the tube and for directing a guide tube supported by the arms across the tube of the steam generator. Positioning devices are known that are capable of relatively moving arms in three directions.

This device allows a complete and remote inspection of a set of tubes in a steam generator to be carried out in a relatively short period of time. However, this device has the disadvantage that it must be manually positioned and removed by means of a closed base that extends into the aquarium. The device must also be equipped with four or five guide tubes in a row to allow complete scanning of the plate into the tube. In practice, this means that the equipment for injecting the 7-cor current sonde must be disconnected from one of the guide tubes and connected to the other one of the guide tubes when it is in the area to reach the demand. . This operation requires manual intervention, which is desirable to suppress for the reasons discussed above. Moreover, the movement of this device is 1! if a large number of tubes are prohibited from use! Do not allow the grate to scan the tube accurately. Finally, this device has a non-negligible weight that is always incompatible with the operations to which it is subjected.

The object of the present invention is to make the inspection of a set of tubes of a steam generator automatic, % fast, reliable and without requiring any human intervention inside the water tank of the steam generator. The object is to provide a device that is completely simple to implement, as well as a method of placement and removal utilizing such a device.

Firstly, in order to ensure access to all perforations in the plate by the same guide tube and to actually reduce the weight of the device, according to the invention, for each perforation in the plate drilled according to a given grid, A device for positioning an am, comprising: a body having at least two connecting members; the connecting members being introduced into a borehole in opposition, independently of each other and in a direction perpendicular to said plate; or means for moving to remove and remove, fixing each connecting member in one perforation, and means for relatively moving the connecting members, wherein one of the connecting members is moved to the other. said means for relative movement equal to at least 41 eyes of said grid such that said means for moving in relation to each connecting member corresponds to a given direction relative to the other and moves the device progressively according to said direction; and means for levering the front ml device around at least one of the connecting members to change the direction of movement of the device on a distance basis, the bodies each comprising one of the connecting members. A mechanism positioning device is proposed, characterized in that it is formed from at least two supporting parts.

Such a device has the advantage of being able to move in two directions IY, which simplifies the control of the running of the tube from hole to hole in the plate.

Preferably, the connecting members are aligned over one or more rows of parallel perforations.

Furthermore, according to the invention there is provided a device for positioning a mechanism for each perforation of a plate perforated according to a given grid, the device comprising: a body following at least two connecting members; means for moving the members independently of each other in a direction perpendicular to said plate so as to introduce or withdraw them oppositely into the borehole;
A connecting finger and device having a guide surface to which the remainder of the threat device is removably attached, comprising means for fixing each connecting member in one bore and means for moving said connecting members relative to each other; remote locking means for linking the remainder of the linking finger to the linking finger, the linking finger including one of the linking members.

According to this feature, the connecting finger can be placed remotely by means of a ball or a rod and the rest of the device can then be placed, for example by fitting a flexible pipe onto the connecting finger, before its placement. It turns out that remote insertion on the guide surface is likewise possible.

According to a first embodiment of the invention, the remote locking means includes a latch, the movement of which is remotely controlled by the ward mechanism.

According to a second embodiment of the invention, the remote locking means are provided by suitable means such as a pawl engaging the slot and a ring whose movement is remotely controlled by a cable or other similar means. It consists of an unlocking piece that releases the pawl from the slot when engaged.

Preferably, the connecting members are aligned over the same row of perforations and the means for moving one of said connecting members relative to the other are arranged in a grid so as to progressively move the device according to said row of perforations. means for moving a valley connecting member relative to another according to a limited direction (by perforations in said row over a distance equal to at least one eye); and at least one of said connecting members for changing the direction of movement of said device. One turn 9 includes means for making the device tgl, and the body is formed by at least two parts supporting each of the connecting members.

According to an sl embodiment of the invention, the device includes two coupling members.

According to a second embodiment of the present invention, the device comprises three connecting members aligned, and the connecting fingers then consist of the intermediate member.

The present invention is also directed to a method for the remote installation of such a device in a water tank of a steam generator, which method comprises a ball and said manhole (by means of a manhole formed in the water tank in one perforation of the plate). positioning the connecting finger by means of a semi-fixed mechanism that walks the connecting finger outside the aquarium through which it passes, positioning the rest of the device by inserting it onto this guiding mechanism; It is characterized by a lock on the connecting fingers.

Some embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.

1 and 2 show a small portion of a tubular plate 14 of a steam generator, which is used for heat exchange between the primary and secondary circuits of a nuclear power plant, for example. guaranteed. The tubular plate 14 has a number of holes or perforations 50 drilled therein into which is secured a U-shaped tube whose lower end only is designated by the reference numeral 16 in FIG. The ends of the tubes 16 open into the inlet and outlet chambers of the cistern defined below the tubular plate 14. In a variation of the illustrated embodiment, the tubular plate 1
The perforations 60 in 4 define a grid of square mesh. However, in a variant not shown, the grid formed (by the perforations) defines a different mesh, in particular an equilateral triangular mesh.

According to the invention, the device 26 can be guided into one of the chambers of the water tank of the steam generator by means of a remote control method which will be described below. It is understood that this device is connected to the boreholes 30 and is capable of moving the length of those boreholes by means of suitable remote control. The device 26 includes a 7-coat (Foua) guided (by one or more guide tubes 66) as shown below.
ault) is adapted to allow remote control of the set of tabs 16 by means of a current probe. The device 26 is likewise understood to carry out this control in a very short time and to take into account the fact that some of the tubes are scratched and therefore cannot serve for their connection.

In order to take these various requirements into account, FIGS. 1 and 2 show that the device according to the invention has a straight section forming the guide rail 32& in the first embodiment and the straight section 32.
It is shown to include a body 52 consisting of a slider 52'b which can be moved on a. Straight section 52a defines at one end a vertical cylinder 54 within which a piston-shaped coupling member '56 is slidably received.

In order to ensure its connection within the tube SO, the end of the connecting member 3A is made of a flexible material fixed to seal the connecting member 36 so that it can be expanded by a fluid under pressure, such as air, at its periphery. It is covered with a film body 44a. This fluid flows through an axial passage 46 communicating with the inner surface of the membrane body 44m.
0 passage 4 injected through a and radial hole 48a
The fluid can be injected into 6a by means of a flexible pipe 50m connected in a sealing manner to the lower end of the barrel 34. Expansion of the membrane 44& results in pressing it against the wall of the tube, thus ensuring the fixation of the connecting member 66.

The straight portion 62 & the other end are the guide tube 66 in the illustrated embodiment.
is rigidly supported, and the guide tube 66 is connected to an external seven-core current probe injection system (not shown) by a flexible pipe that crosses a manhole, such as a set of control cables and piping of the device 26. 68 is the steam generator 1
The end of the 7-cor current sonde is schematically shown at the point as it is injected into the main tube.

As shown in FIGS. 1 and 2, the distance *a separating the axis of the piston 36 from the axis of the guide tube 66 in the illustrated embodiment is equal to four times the pitch defined by the grid of perforations 300. Thus, when the end of the anchoring member 36 is introduced into one borehole 30, the guide tube 66 is placed against the other borehole 30 separated from the former one by the intermediate two boreholes.

Like the straight section 52a, the slider 321B includes a vertical axial barrel 38 that receives a piston-shaped coupling member 40 for sliding movement within the barrel. Connecting member 5
6, the connecting member 40 can be connected to the inside of the jI bore 50 by its end. This companion is provided with a flexible cylindrical membrane 441) which is likewise secured at its ends to the connecting member 40 in a sealed manner, the membrane 44b being able to hold the body under pressure, such as air. When applied to the inner surface of the membrane, it can be pressed against the inner wall of one perforation. This fluid is injected outside the barrel 38 through a central passage 46'b provided by a flexible pipe 50b that enters the guide pipe 72.

To allow passage of slider 52b, portion 32
It can be seen in FIG. 1 that 1 has a central opening 42. More precisely, this opening 42 allows the slider 32 to move between two positions in which the axis of the member 40 is aligned with one or the other of the boreholes 30 located between the connecting member 36 and the guide tube 66.
In order to control the relative movement between the slider 52b and the 0 portion 32&, which is understood to move the A motor (not shown) that controls the rotation of the binoculars 520 that engages the rack 54
Means constituted by is provided.

Furthermore, the cylinder 3 (and s
Means are provided for controlling the movement of coupling members 36 and 40 into the interior of 8. In the exemplary embodiment shown in FIG. 2, the means include the cylinder 54 and the member 54 with respect to section #36. 16 and is constituted by a variable capacity chamber 54a defined between the two. A pressurized fluid, such as air, is passed through the pipe 56 to connect the member 56 towards the interior of the borehole 50.
It can be injected into a. The springs 58& act in the opposite direction to cause the end of the member 36 to escape from the bore 30 when the pressure is relieved. A comparable movement of the coupling member 40 can be obtained by a variable volume tN54'b provided by a conduit (not shown) and a counter spring 5811.

It can be seen that with one combination of the described features, a gradual movement of the guide tube 66 along a row of perforations 60 is possible to achieve a control of tape ≧-tape corresponding to a row of holes. In fact, starting from the position shown in FIG. 2 in which coupling member 36 and Jf 40 are fixed in two adjacent boreholes, and if it is desired to move to the left, fuselage 44'b is fixed in two adjacent boreholes. 3
Release from the inner wall of the chamber 54b and then relaxing the pressure in the chamber 54b is sufficient to retract the membrane 44k so that the member 40 can be pulled out of its perforation. The motor controlling the movement of slider 32b in relation to section 32a can then drive and move this slider until it reaches the position shown in FIG. In that case, the opposite operation to the numbered operation is to introduce the member 40 into the borehole 60 adjoining the membrane body 4
When expanding 4b, this is done so that the member 40 is secured within its bore.

Then, the movement of the portion 32 & supporting the guide tube 66 is caused by the movement of the membrane body 4.
This device can be carried out after the pressure on the interior of the sword is released and the connecting member 66 is withdrawn from the solidified borehole. By advancing one pitch] it returns to the position shown in Figure 2. Of course, to move in the opposite direction, move part 62 & slider 5
It can be obtained by moving forward at 211.

In order to allow the device 26 to control the entire row of perforations in the tubular plate 14, means are provided for rotating the guide tube 66 which carries it around the section 321 and the connecting members 36 and 40.

This rotation allows the device to pass from one row to the other and still achieve a tube that is accessible.

In the illustrated embodiment (FIG. 2), this rotation is controlled by a pinion 62 mounted for rotation within a slider 52kJ and supported on said barrel by an electric motor (not shown). This is obtained by providing tooth surfaces 60 that mesh with each other.

Of course, the rotation of the rotation device 26 of the coupling member 40 is controlled by the effect of the shape of the grid of perforations 60 formed in the tubular plate. Thus, in the case of a square mesh lattice, the rotation is 60° in the case of an isosceles triangular mesh lattice.
, 120° or 180o, but 90° or 1
It is 80°.

In an example not shown, it is possible to envisage a device which can likewise be moved diagonally for a grid of square meshes. This device differs from the device shown in FIGS. 1 and 2 by the arrangement of the guide tube near the coupling member 56 and the extension of the section 32a which increases the free stroke of the slider 52b. The rotation of part 32a around member 40 is then around 45°.

According to the invention and in order to allow remote mounting and dismounting of the entire device as described below, the coupling member 4°
0 and its barrel 58 constitute a connecting finger, which can be placed on the finger and attached independently of the rest of the device to be subsequently locked. For this,
In FIG. 2 the barrel is formed by two parts 38a, 581) which are rotationally interlocked but can be slid one inside the other by cleaning or other similar means (not shown);
As a result, the outer part 38a and the device 2 connected thereto
6 can slide downwardly on a guide surface 59 formed in the inner part 381), in which a coupling member 40 is provided for remote attachment of the device 26 on said coupling member 40 and Encased to allow removal.

In the embodiment of FIG. 2, the locking of the remainder of the device 26 onto the inner part 38b of the barrel is effected by means of a rotary catch 64 mounted on the upper part of the slider 321) and whose rotation is motorized. 70. The motor may be supported on a flange formed in the upper part of the barrel portion 58t to lock the device 26, or by means of a latching mechanism that separates the 7 langes to permit removal of the remainder of the device. Gold 26 is allowed.

The operation of installing the apparatus shown in FIGS. 1 and 2 in the water tank of the steam generator will be described with reference to FIGS. 6a to 30.

In FIG. 3a, the inner end of the steam generator 10 is bent and its horizontal tubular plate 14 has a number of U-shaped tubes 16, only the lower ends of which are shown. The inlet and outlet ends of the tube 16 communicate with an inlet chamber 18 and an outlet chamber 20, respectively, of a water tank 22 of the steam generator 10. The outer wall 12 of each chamber 18 and 20 has a manhole 24
According to the invention, the device 26 can be introduced remotely, for example to examine tubes with a Foucault current probe, without human access to the so-called aquarium 22.

During the first step of the placement method, connecting fingers 58b and 40
is introduced into the chamber 1B by a pole or a ball 71, for example. The end of the connecting member 4o is then always connected to the pole 7.
1 and remotely across the manhole 24 into one of the perforations 60 of the tubular plate 14. Pressurized fluid is injected by pipe 50b to ensure fixation of member 40 within this borehole. In FIG. 5a, the remainder of the device 26 is then threaded onto a flexible pipe 72, and as shown in FIG. The terminated second pipe 74 is inserted. When sliding the device 26 and the pipe 74 along the pipe 72, the device 26 is brought onto the guide surface 59 without difficulty and always without human interference inside the aquarium. In that case, the hook is the metal 64 part of the cylinder! +81) The mechanism 70 is not remotely controlled so as to rotate the latch 64 to lock the device 26, thus locking the device 26. This operation is similarly remote, since the device 26 is introduced into the aquarium with a whole bundle of cables and conduits that ensure its control, as well as with a flexible conduit connecting the guide tube 66 to the injection device of the Foucault current sonde. It is done under control. FIG. 50 shows the device 26 thus positioned after removal and movement of the flexible pipe.

FIG. 4 shows a variant of the device which differs substantially from that shown in FIGS. 1 and 2 by the implementation of means allowing remote coupling and uncoupling of the device onto the coupling fingers. Portions not described are the same as those in the first embodiment. In this variant, the same numerals with the addition of 100 were used to designate parts similar to those of the first embodiment.

In FIG. 4, the cylinder 15B, in which the connecting member 140 is housed, the end of which is introduced into the borehole 150 of the tubular plate 114, carries at its upper end a support 180, on which On the one hand, a motor M controlling the rotation of the pinion 162 about the horizontal axis is housed, and on the other hand a pawl 182 directed downwards and pivoted about a horizontal axis 184.

Torsion spring 186 is attached to member 14 in the illustrated position.
The claw body 182 is urged toward the zero axis.

The pinion 162 meshes with a toothed ring 160 formed in the upper portion of the slider 132b shown in cross section as well as the portion 152a on which it slides. In addition to the toothed ring 160, the slider 162b has a claw body 18 in its upper portion.
2 has a 7 flange which is above the end of the pawl body 182 when it assumes the position shown.

Between the end of the claw body and this 7 lunge, this 7
An annulus 188 is provided which the langes support via ball bearings 190. This bearing is slider 132
and is evidenced by the fact that the remainder of the device 126 can rotate around the barrel 138 as in the variant of FIGS. 1 and 2. The end of the pawl 182 is therefore normally engaged within a recess of the slider 162b formed below the annulus 188.

The support 180 further supports a boot IJ 192a and allows a cable 194a to slide through an aperture 196 formed in the slider over the groove.
The outer end of 94 has a grip 2 whose inner end is formed into a slider.
In its portion located below the claw body 182, the slider 132b further includes a vertical hole 202 extending outside the water tank of the steam generator to be inspected when supporting the hook 198a adapted to be connected to the hook 198a. , the vertical hole is aligned with the end of the pawl 182 when assuming a position corresponding to removal of the device, and has a finger 2 in the vertical hole so as to project downwardly of the slider 152b with its lower end.
06, the shaft 204, normally held in the lower position, slides.

An annulus 208 slidably mounted on the slider 152b and having an axis coinciding with the axis of the segment 138 is located at the lower end of the slider. located below the section. Ring body 2
08 further has a vertical hole 210 through which a second cable 194b attached to pulley 192b passes and where its other end exits the steam generator. hole 21
The end of the cable passing through 0 supports a piece 198b whose cross section is larger than the cross section of the hole.

The apparatus described with reference to FIG. 4 operates as follows.

After arranging the fingers including the connecting member 140 and the barrel 158 in a manner comparable to that described with reference to FIG. 5a, BOOM! Cable 194a pre-placed on J 192a
are utilized to attach the remainder of the device 126. To this end, the hook 198 is engaged with the handle 200 and pulled out onto the free end of the cable 194a. When the device 126 reaches a height close to the plate 114, the pawl 182
is retracted and automatically maintains the rest of the device.

Hook 198a then lowers by gravity across hole 210 and pulls cable 194a, at which point device 126 is ready for operation.

Cable 194b is utilized when it is desired to unlock the device from the connecting fingers in order to remove the remainder of the device.

When the end of the cable 194b is pulled, the piece 198b is held against the lower part of the loaf 208 which slides upwardly to dispense the rice.

When the ring body 20B acts on the shaft 204, it releases the end of the pawl body 182 from the corresponding recess against the spring 186. Loosening of cable 194b then causes device 126 to lower, leaving only barrel 158 and link 140 in place. In this case, the connecting body 140 may be easily retracted remotely in order to rotate downward. As in the aforementioned variants, the entire installation and removal operation can therefore be carried out remotely without requiring operator intervention inside the aquarium.

Of course, the invention is not limited to the embodiments described by way of example, but covers all variants.

In particular, it may include two similar connecting members 56a and 561) housed within a cylinder attached to each leak in the straight section 52a of the pod 62 in FIG.

Of course, the means for controlling the fixation of the members 56a and 361) within the borehole 30 are the same as those described with reference to FIGS. 1 and 2.

Means for controlling the movement of the members perpendicularly to the tubular plate 14 for introducing them into and withdrawing them from the end of the tube, two parts 52
The same applies to the means for controlling the relative movement of a and 321) and the means for controlling the rotation of the device about the central member 40.

In FIG. 5, in this embodiment part 5 of the body of the device
The second connecting member 56b of 2a occupies the position of the guide tube 66 in the first embodiment described with reference to FIGS. 1 and 2.

By way of example, FIG. 5 shows an arm 65, in which the guide tube 66 is not directly interlocked with the portion 52a, but is rotatable about the axis of the connecting member 56b. Figure 5 shows a variant in which the guide tube 66b can be attached to the end of the member 561, so that the guide tube 66b can be brought into contact with the six perforations 50 adjacent to the perforations corresponding to the member 561) as indicated by the arrows in FIG. There is. member 661)
The means for controlling the rotation of the arm 65 of the rotator is an arm centered on the member 56b and rotatably driven by an electric motor (not shown) via a pinion 69, as schematically shown in FIG. A gear 67 that interlocks with 65 can be met.

Of course, other solutions are also possible, in particular the possibility of rigidly attaching a plurality of guide tubes to the portion 52a by arranging them, for example 900, with respect to the direction defined by the portion 32a.

In short, it will be understood that devices ensuring remote control of the devices described are well known to the specialist and do not form part of the invention. The same applies to the device controlling the injection of the 7-co current sonde.

On the other hand, it will be appreciated that although the apparatus has been described for advancing one pitch at a time, it may also be adapted to advance several pitches at once.

Of course, the various embodiments described can be subjected to numerous minor modifications without departing from the scope of the invention. Among these changes, the following modifications should be noted in particular.

The rack arrangement 54 allowing movement of the slider 52b in relation to the guide rail 32a can be replaced by two symmetrically arranged guide shafts and by a jack.

The slider 521) can support a plurality of connecting members of the type of member 40, for example a slider arranged according to the top of a square and fed by two compressed air generators one by one. The guide rail 5 can support two parts, which ensures better angular positioning and reduces the risk of falling, and allows the parts to be compared.
2a can likewise support a plurality of connecting members of the type of member 36 and, for example, two symmetrically arranged members. When the slider 321) supports four connecting members, the guide rail 52a has a rectangular shape. It is understood that the guide tube 66 can then be located in the rectangular 1Pp4 section formed by the guide rail.

The electric motor for the rotation of the slider 321) in relation to the guide rail 32a can be replaced by a rotary jack, which can be coupled with a reduction gear if necessary.

[Brief explanation of drawings]

1 is a bottom view showing a first embodiment of the device according to the invention connected below the tubular plate of a steam generator; FIG. 2 is a sectional view along the line ■-■- in FIG. 1; 3 to 3C are schematic diagrams showing different stages of the method of arranging the apparatus of FIGS. FIG. 5 is a cross-sectional view showing a second embodiment of the invention and in particular the means for controlling the remote locking and unlocking of the device on its central finger; FIG. 5 compared with FIG. 1 showing an embodiment of the device according to the invention; FIG. In the figure, numeral 10 is a steam generator, 14 is a tubular plate,
22 is a water tank, 24 is a manhole, 2 and 6 are devices, 60 is a perforation, 62 is a body, 32a is a guide rail, 321)
is a slider, 56 is a connecting member, 58 is a cylinder, 38a is an outer portion, 381) is an inner portion, 39 is a connecting finger, 4G is a connecting member, 44a, 441) is a membrane body, 46a is an axial passage , 52 is a pinion, 54 is a rack, 54a, 541) are variable capacity chambers, Saa is a spring, 58b is a counter spring, 60 is a tooth surface, 62 is a pinion, °64 is a latch, 66 is a guide tube, 70 is a Electric motor, 71 is a ball, 72 is a guide pipe, 1
14 is a tubular plate, 126 is a device, 138 is a cylindrical body, 1
40 is a connecting member, 182 is a claw body, 186 is a torsion spring, 194b is a second cable, 198a is a hook, 1
98b is a piece, 200 is a grip, 204 is an unlocking piece, 208
is a ring.

Claims (1)

[Claims] (1) A device for positioning a mechanism for each perforation of a grate perforated according to a given grid,
a body having at least two connecting members and means for moving these connecting members independently of each other in a direction perpendicular to said grate so as to introduce them into or out of the borehole oppositely; , each connecting member is 1
and means for relatively moving the connecting members, the means for moving one of the connecting members relative to the other by g4 times each connecting member. , means for moving based on a distance equal to at least one eye of said grating so as to progressively move the device according to a given direction relative to the other, and a device for changing the osm direction. means for rotating the device around the rotation of at least one of the connecting members, and wherein the body is formed from at least two parts each supporting one of the connecting members. (2) Mechanism positioning device according to claim 1, characterized in that the connecting members are aligned on one or more rows of half-row perforations. (8) Perforations according to a given grid A device for positioning a mechanism for each perforation in a plate that has been formed, the device comprising:
a body having at least two connecting members and a means for moving these connecting members independently of each other in a direction perpendicular to said plate so as to introduce them into or out of the borehole oppositely; a connecting finger having a guide surface to which the remainder of the device is removably mounted; and means for securing each connecting member within a borehole; and means for moving said connecting members relative to each other; and remote locking means for linking the remainder of the device to the front 11a linking finger, the linking finger including one of the linking members. (4) The mechanism positioning device according to claim 3, wherein said remote locking means includes a latch whose rotation is controlled by a motor to lock onto a suitable side. (5) The far I14 locking means has a pawl body that engages in the multi-slot hole under the action of an elastic hand mechanism, and a locking piece that releases the pawl from the debris receptacle when biased by a suitable unlocking means. A mechanism positioning device according to claim 5, characterized in that the mechanism positioning device comprises: (6) The unlocking means comprises a ring resting on the arm, whereby the p-movement is remotely controlled (by cable or similar means). Mechanism positioning device as described in section. (7) the connecting members are aligned over the same row of perforations and the means for moving one of the connecting members relative to the other is such that the means for moving the device progressively according to the row of perforations; means for moving each connecting member relative to the other according to the direction defined by the perforations of the preceding array over a distance equal to at least one eye of the grid; means for rotating the device in at least one rotational direction;
The fIA positioning device according to any one of claims 3 to 6, characterized in that it is formed by at least two portions that support each of the body connection members. (8) The mechanism positioning device according to claim 7, characterized in that it includes two connecting members. 9. A mechanism positioning device as claimed in claim 7, including three aligned connecting members and said connecting fingers comprising an intermediate member. A semi-identical a! which connects the connecting finger to the exterior of the water tank passing through the board and the manhole through a manhole formed in the water tank in one perforation of the σq grate. I6
position the connecting finger by inserting the rest of the device onto the guide mechanism, and position the rest of the device 1sIij on the connecting finger! A method for remotely installing the device according to any one of claims 3 to 9 in a water tank of a steam generator, characterized in that: