CN85104786A - The seismic support medially that can adjust at a distance - Google Patents

Abstract

Seismic bearing system comprises the basic part of seismic support squarely on the indication coil that is contained in bar, so that surround sealing shroud, in order under earthquake conditions, to prevent control rod actuator deflection, this supporting can mount and dismount at a distance, adjust at a distance with respect to another supporting by the adjustment piece that can move radially, being controlled by the actuating lever that vertically stretches out can axially movable startup piece, makes to adjust piece and produce and move radially.Round the supporting of whole arrays, so that lateral confinement ground seismic support, sustained ring is to be connected on the control rod actuator cooling jacket to the earthquake sustained ring all around, and this cover links to each other with the nuclear reactor closing device again successively.

Description

The seismic support medially that can adjust at a distance

The present invention relates to common nuclear power equipment and the special middle seismic bearing system that can adjust at a distance, native system is adapted to be mounted within on control rod actuator (CRDM) sealing shroud, for preventing to move the excessive deflection of cover generation at the load condition lower control arm gear train bar that forces of violent earthquake.This excessive deflection is added on the weld seam of control rod actuator osmos tube and reactor vessel closing device with a kind of excessive pressure load causing habitually, simultaneously, will produce the adverse effect of closing nuclear power equipment work rapidly.

In booster-type water reactor (PWR), the influx and the discharge rate displacer bar gear train (DRDM) of control rod actuator (CRDM) and control pile core moderator water stretch out vertically upward with the form of the cantilever closing device from nuclear reactor pressure container.The bottom of the osmos tube of control rod actuator and displacer bar drive-train means is to be contained in the regulation hole of closing device with shrink fit, is the bottom surface that is welded on closing device around the osmos tube bottom.When generating set turns round continuously, air themperature in reactor pressure vessel will raise significantly, well imagine, be equipped with control rod actuator and displacer bar drive-train means osmos tube those holes be radially expanded speed ratio pipe p.s. to be radially expanded speed big, the lower end of these permeation tubes just no longer is fixed among the closing device of reactor pressure vessel with shrink fit and welding dual mode, and has only weld seam to work.Therefore as can be known, because the load carrying plane is very little, weld seam is not directly lived excessive pressure load, and weld seam will bear sizable moment of torsion and moment of flexure.

For example, when reactor suffered earthquake, the bar that control rod actuator and displacer bar geartrain systems are long moved cover, just leaves the normal position and produces sizable deflection, in deflection, there is excessive pressure load to be added on the weld seam of closing device of osmos tube and pressure vessel.In addition, this a kind of deflection load is bound to be added to the control rod actuator bar and moves and put, the distortion that makes cover produce especially severe, therefore, to the brake ability of control rod actuator drive link and the startup of control lever, all to produce injurious effects.In order to reduce the deleterious effect of these operations, fixedly control rod actuator and displacer bar gear train bar move the free end on cover top to common generating set with pull bar, pull bar reaches between the building wall and top earthquake sustained ring of equipment, around this ring round the topmost of the position indicator coil parts of bar, so that move the top free end of cover round each control rod actuator and displacer bar gear train bar.Fact proved, for those generating sets, this device is quite to close people's satisfaction, can be limited in generating set in the zone, in this zone, can be subjected to being equivalent to the pressure load of rudimentary or intermediate earthquake strength, and can be the deleterious effect restriction of closing ability rapidly within the acceptable range.But, can't prove now, under strong earthquake magnitude situation, particularly, can reach desirable inhibiting effect to this device and also lack proof moving cover when being connected with the control rod actuator bar.Under extremely special situation, or even be subjected to strong seismic (seismal, when the bar of this stationary installation and control rod actuator and displacer bar gear train moves the cover connection, the provable yaw motion that moves cover at the bar that suppresses displacer bar gear train effectively is enough fully with satisfied, in view of this fact, also be provided with the bar of displacer bar gear train is moved the concentrating structure that cover is configured to big quality, yet, moving cover when linking to each other with the bar of control rod actuator, resisting deflection but is the fact.Particularly, a large amount of the concentrating of quality is defined in control rod actuator sealing shroud and the coil overlapping device.Therefore, particularly under the situation of violent earthquake, still need to adopt a kind of suitable method to limit the center section that each control rod actuator bar moves cover effectively.

In fact, with moving other original technology of linking to each other of cover or traditional booster-type water reactor with the control rod actuator bar, also can satisfy the needs of above-mentioned this seismic support medially, therefore, under strong earthquake conditions, a kind of preventive measure of the structure of seismic support have medially suitably been adopted, separate continuous and ubiquitous control rod actuator bar to move cover excessive deflection problem, this structure is connection or is fixed on the reactor pressure vessel closing device, the middle part of moving the top stiff end of cover with control lever, but this structure of seismic support medially also requires the maintenance personal to advance to such an extent that go, and this is in order to finish installation, adjust and dismounting.But in view of this fact: promptly special reactor is in case running in the near zone of reactor pressure vessel closing device (people need go to the zone of work), is medium radiation, and this is very undesirable.In addition, because the booster-type water reactor personnel of custom design are inaccessiable.For example, apply for by this patent procurator, pile core that plan to give the special type booster-type water reactor that commercial nuclear power equipment uses is that 185 gear trains close And and form, 97 control rod actuators and 88 displacer bar gear trains are wherein arranged, and the distance of its center to center is 25.3 centimetres.In fact the maintenance personal can not enter near each seismic support structure medially.

Therefore, fundamental purpose of the present invention for a novelty is provided, the structural system of seismic support medially after improving, to solve the existing problem of aforesaid seismic bearing system.

For this purpose, the present invention also has the seismic bearing system of the control rod actuator cover of a nuclear reaction, this reactor comprises a container with closing device, have many from the closed dress protrusion of nuclear reactor control rod actuator upwards, each this mechanism also has a sealing shroud, the driving stem of control lever also is housed respectively in cover, be characterized in, to those control rod actuators are interactional seismic supports medially, all be with a sealing shroud around each supporting, and be connected with an adjacent ground seismic support.

The square that seismic bearing system all has a big square foundation part or circular port is arranged at core in the middle of each, allow the control rod actuator bar to move cover, and the position indicator of the bar of seismic bearing system is dropped to above the control rod actuator sealing shroud from the top down by this hole.The notch portion of ground seismic support can be adorned the conduit of control rod actuator parts, and the adjustment piece that can move radially is equipped with at two angles relative with conduit.Starting piece is to be inserted between the adjustment piece and basic part that can move radially, and starting piece and adjusting piece all has the lozenges that matches.The actuating lever that is contained on the basic blocks is rotatable, with start piece with being threaded, therefore can be predetermined the revolution of actuating lever, starting piece produces along moving that axis makes progress, just cause that adjusting piece radially moves, so that realize the adjustment operation between the control rod actuator parts separately of adjacent seismic bearing system and they.Actuating lever stretches out vertically upward from the dish of ground seismic support basic blocks by the position indicator parts of the bar of control rod actuator, and the actuating lever upper end has a throw that suitable moment of torsion is arranged, so that start with suitable rotation mode.The earthquake sustained ring is fixed on the cover of ventilation unit of control lever drive disk assembly, all around round whole control rod actuator seismic bearing systems of the present invention reliably.Certainly, the cover of control rod actuator ventilation unit is to be fixed on reliably on the nuclear reactor pressure container device, uses the proper container support, and this device is fixed on the building wall of equipment successively reliably.Because in order to prevent that same deflection is arranged under the violent earthquake situation, this firm mounting system is to link to each other with the control rod actuator parts and be restricted.In view of this fact: actuating lever may be raised to control rod actuator bar the position indicator coil parts the adjacent position and be activated.Seismic bearing system of the present invention is to adjust at a distance, certainly as far as what degree or possible move all relevant with the control rod actuator parts, also to consider the shape of supporting system, in fact, be to load onto the control rod actuator parts or above it, remove with the lowermost part of the position coil of the operating control barre of crane type.

Above mention, general displacer bar gear train parts can not be subjected to tangible lateral deflection, even under CR Critical earthquake conditions, consider the structure that such parts can not cause quality quite to concentrate yet.Yet, this displacer bar gear train parts are perhaps met and are subjected to this deflection and move, perhaps in this example, needing an extra insurance to make displacer bar gear train parts not produce this deflection moves, seismic bearing system of the present invention comprises another impact damper, this impact damper is placed in around displacer bar gear train parts and the control rod actuator seismic bearing system of the present invention junction, therefore, the lateral deflection of displacer bar gear train parts is moved and will be restricted.

Referring to accompanying drawing, from following narration, just can clearer, better understand the present invention.In the accompanying drawings, same number is indicated and be same part in addition in several figure.

Fig. 1 is the part front elevation of the nuclear reactor closing device of pressurized water, it has many control rod actuator and displacer bar gear trains of installing with vertical mode, among this figure, seismic support medially novelty of the present invention, after improving is that expression is installed on the sealing shroud of leftmost control rod actuator;

Fig. 2 is the partial sectional view of control rod actuator system front elevation;

Fig. 3 is the planimetric map of the position indicator parts of bar, is related with the work of the control rod actuator system of Fig. 1;

Fig. 4 is the planimetric map of seismic bearing system in the middle of of the present invention after the novel improvement, has expressed the identical number of part in addition in the drawings;

Fig. 5 is the sectional view of the middle seismic bearing system among Fig. 4;

Fig. 6 is the control rod actuator of pressurized water reactor and the floor map that displacer bar gear train is arranged, have many novelties, after improving in the drawings and be used in middle seismic bearing system on the several Control bar gear train parts respectively, superincumbent whole control rod actuator and displacer bar gear train and middle seismic bearing system and earthquake sustained ring structural interaction all around are installed.

Study all figures now.Please carefully consult Fig. 1-3, have many control rod actuators (CRDMS) 12 and water displacer bar gear train (CRDMS) 14 mounted thereto by the osmos tube 16 and 18 on this device on the pressurized energy water reactor closing device 10, these control rod actuators 12 and displacer bar gear train 14 are with the form of cantilever from closing device vertically upward.Each control rod actuator parts 12 all has sealing shroud 20, this cover lower end is mounted in the osmos tube 16 on the control rod actuator closing device, and bar moves the bottom of cover 22 and the top of sealing shroud 20 is to be threaded, referring to 24 among Fig. 2, welded top O-ring seal 26 is to be decided to be sealing shroud 20 and bar to move annular pressure border between the cover 22.It is cylindrical tubes that bar moves cover 22, the drive link 28 of the control lever of vertically moving nuclear reactor just is mounted in it and moves along cover, certainly, bar 28 link to each other with the reactor control lever (not drawing among the figure), bar 28 can move up and down, different clampings or hold-down mechanism (not drawing among the figure) all are housed in each tubular sealing shroud 20, and these mechanisms all link to each other with the drive link 28 of control lever, also link to each other with the reactor control lever.In order to start or to handle the drive link clamp system, each control rod actuator parts 12 also is equipped with the eclipsed form coil component, these parts by three up and down at a certain distance and the electromagnetic component 30 32 and 34 that links to each other form, nethermost electromagnetic component 30 is the clamp magnet of fixing, middle electromagnetic component is movable clamp magnet, and top electromagnetic component is the magnet that pushes away on having.These three electromagnetic components 30,32 and 34 are strictly to switch in order or cut off the power supply, and so just make the drive link 28 of control lever rise or descend, thereby have just controlled the control lever of pile core, with the mode of the actuator cylinder further or downward backward that makes progress. Electromagnetic component 30,32 and 34 power supply are by 36 power supplies of the cable in the conduit 38 that is contained in control rod actuator, conduit 38 is to be contained in the edges and corners of each electromagnetic component 30,32 and 34 vertically, abreast and by these parts, and also to move cover 22 parallel with bar for conduit 38.Cover or socket 40 are equipped with in the upper end of conduit 38, electric connector seat (not drawing among the figure) are housed at cover in 40, by edge connector can electromagnetic component 30,32 with 34 and feed cable 36 link to each other with the pulpit of nuclear power equipment.Please note, in this junction, comprise electromagnetic component 30,32 and 34 and the assembly of conduit 38 are the next doors that slidably are positioned on sealing shroud, when initial installation portion 30,32 and 34 and during conduit 38, for example, at shown position with respect to sealing shroud 20, for fixed part 30,32 and 34 and the axial location of conduit 38, and need its weight of supporting, can adorn an annular flange dish 42 in sealing shroud 20 bottoms, referring to Fig. 1, electromagnetic component just supports thereon.

As mentioned above, relative with the start-up system of control rod actuator, the displacer bar gear train 14 of each nuclear reactor all has a displacer bar (not shown) in bar moves cover 44, and moves therein.The displacer bar becomes piston-like, being positioned on the displacer bar moves in the cover 44, can be controlled at bar to the cooling medium of booster-type reactor thermal core moves in the cover 44, when needs, in this way, the displacer bar can rise in cover 44, otherwise, the booster-type cooling medium can move in the cover 44 from bar and discharge, so that the displacer bar descends because of deadweight.Suitable hold down gag (not drawing among the figure) is to be contained in the top 46 of each displacer bar gear train parts 14, so that the lifting position of restriction displacer bar gear train drive link.Because it is as can be known above-mentioned, displacer bar gear train parts 14 can not be designed to heavy electromagnetism kinematic train, this is the characteristic of control rod actuator parts just, therefore, yaw motion must adapt to the situation of control rod actuator, certainly the caused problem of this motion must be resolved, and under earthquake conditions, it is relevant with displacer bar gear train parts 14 occurring undesired.

The displacer bar of not shown displacer bar gear train parts 14 only is suitable for being positioned on two extreme positions wherein, promptly rise (UP) position or decline (DOWD) position.In order to indicate the position of displacer bar for maintenance personal or operational administrative personnel, so that Monitoring and Controlling work, each displacer bar gear train parts 14 all is equipped with position indicator (RPI) the coil component (not shown) of bar, these parts have two probe coils, be contained on the good tubular-shaped structures of rigidity, be separated with certain vertical range.Whole parts all are positioned on displacer bar gear train bar and move near the cover, and slidably.In this way, the position (not shown) of displacer bar just can enough suitable personnel monitor and control, and point out by the inductive reactance of coil with the position indicating device of bar, as moving with respect to the bar indicator component, be defined between the coil component and displacer bar of displacer bar with the displacer bar.

The position index line coil component 48 of similar bar is housed on the control rod actuator parts 12,, is decorated with two among the figure referring to Fig. 1.Upward associated displacer bar gear train parts 14 are different with work for the position indicator coil parts 48 of control lever, the coil that in the position indicator coil parts 48 of control rod actuator bar, has only a cover vertical range to change, be contained on the tubular element 50, and element 50 be contained in the control rod actuator bar move the cover 22 near, slidably.As can be seen, indication coil in the position of control rod actuator bar is that top from control lever sealing shroud 20 upwards reaches the top that bar moves cover 22.Also can from Fig. 3 and 5, find out in addition, the position indicator coil parts of every control rod actuator bar all have chassis 52, the bottom of tubular element 50 can be firm peace thereon, for example, will be on the concave station part 54 on chassis 52, taking over a business 56 is the tops that are securely fixed in tubular element 50 with similar method.There is an annular cover 58 on chassis 52, and it can be positioned on the annular table 60 of control rod actuator sealing shroud upper end, near annular table be ring seal weld seam 26, as shown in Figure 2.Upper disc 56 is equipped with corresponding electric connector seat 62, the indication coil of it and bar is electrically connected, also has square groove 64 in edges and corners, when the position of bar indicating device 48 is contained in the control rod actuator bar when moving on the cover 22, the side cover 40 on the sleeve pipe 38 just can be mounted in it the position of coil, the position indicating device 48 that makes bar is the position (not shown) of monitoring reaction heap control lever all the time, for example, in the rising or decline of general work, control lever can be placed in several positions.

Narrate according to the front, in order to limit the lateral deflection campaign of control rod actuator parts 12 effectively, particularly limit moving of the overlapping parts 30-34 of control rod actuator sealing shroud 20 and coil, the present invention has developed a kind of remote adjustment seismic support medially, represents with number 100, originally is supported with a big square foundation part 102, on have center pit 104 its diameters to be a bit larger tham the external diameter of control rod actuator sealing shroud 20, and can stipulate an annular gap, for example, 0.25 cun gap is arranged.Ground seismic support 100 can be positioned on sealing shroud 20 near, as shown in Figure 1, some parts lists of ground seismic support 100 are shown among Fig. 4-6.Ground seismic support 100 is suspended on the chassis 52 of position indicator of bar reliably, for example, with three clamp devices that are evenly distributed on basic part 102 circumference, when the annular cover 58 on the position indicator chassis 52 of bar is when being positioned on the annular boss 60 of control rod actuator sealing shroud, ground seismic support 100 just be enclosed within sealing shroud 20 around.

Can know from Fig. 4 and find out that in this view, angle on ground seismic support basic part 102 has the big triangular incision in two places 108 and is limited in web 110 between this two place, clamp device 106 is fixed thereon reliably.Otch section 108 is to be used for by being used as the circulating air of the overlapping parts cooling medium of control lever drive coil, and to reduce the temperature of those parts, it is overheated to have prevented reliably.On the angle relative, big square notch 112 is arranged, movably large U type catheter holder spare 114 is housed in otch with one of clamp device 106.Two lateral surfaces of catheter holder spare have two to overhanging key 116, are installed in the keyway identical with its shape 118 and slidably, 114 just are limited in the basic part 102.In case be positioned in the keyway 118, just catheter holder be screwed in or sell (not shown) on basic part 102 with suitable securing member.Local seismic support 100 is that the position index line coil component 48 in company with bar is when dropping on the control rod actuator parts 12, the mobility of catheter holder 114 allows ground of the present invention seismic support 100 to lead to the below of the edge connector 40 of conduit 38, in case ground seismic support 100 is at the axis direction of edge connector 40 up and down the time, catheter holder just slides, be fastened on then in the basic part 102, so that control rod actuator sealing shroud 20 supporting tube 38 well.

At remaining just in time relative place, two angles of basic part 102, have and adjust ground of the present invention seismic support 100 and support the device of 100 positions with respect to another, and relative control rod actuator sealing shroud 20.At that place, two angles of basic part 102, large rectangle otch 120 is arranged especially, this otch is very identical with otch 112, but otch 120 is littler than otch 112.In a similar manner, on the sidewall of the otch 120 of basic part 102, be processed with keyway 122, be fixed on the side direction of adjusting piece 126 sides and protrude key 122 and be positioned in the keyway 122, slidably.The radial side 128 of adjusting piece 126 is upwards to slope inwardly, and each is adjusted the radial side of piece 126 and all is furnished with a vertically rotating startup piece 130.This piece is the inside that is positioned on otch 120, and like this, the sideway movement that starts piece 130 just has been limited.It is outward-dipping downwards starting piece 130 radially-outer surfaces 132, and therefore, the lozenges that matches has been formed with the corresponding piece surface 128 of adjusting in surface 132.So, when starting piece 130 and produce up or down a vertical movement,, start piece 130 and just make and adjust piece 126 an outside or inside motion takes place by the interaction of lozenges 128 and 132, adjusting moving radially of piece 126, is to lead with key 124 and keyway 122.

In order to realize starting 130 vertical movement, each starts on piece 130 a vertical actuating lever 134 all is housed, and it upwards reaches the upper disc 56 of the position indicator of bar from basic part 102 always, referring to Fig. 3.The lower end of actuating lever 134 is fastening with nut, and nut is under the lower surface of basic part 102, to prevent that opening bar 134 extracts out from the earthquake support unit.The upper surface of nut 136 is processed into the bearing shape, can rotate freely with respect to basic part 102, and can not be subjected to any interference.Thrust bearing 138 is in the concave station 140 that is positioned on the basic part 102, above thrust bearing 138, is processed with external thread 142 on actuating lever 134, matches with internal thread on starting piece 130.When actuating lever 134 rotates, start piece 130 and just rotate up or down, correspondingly affect the radial position of adjusting piece 126.Must be noted that, help the assurance of thrust bearing part 138-140, pressure load will bear at thrust axis 138 respectively, adjust on the interaction face 128 and 132 of piece 126 and startup piece 130.After one local seismic support 100 was installed and adjusted to the right place, actuating lever 134 was just necessarily malfunctioning, and actual supporting 100 will be worked.Adjust and rotation actuating lever 134 with the moment of torsion plank, this plank can be made an integral body or be fixed in the above in actuating lever 134 upper ends.Therefore, the maintenance personal just can install at a distance, adjust, dismantle and keep in repair earthquake supporting structure of the present invention.

We also will mention, the characteristics of mounting means according to the present invention, earthquake supporting structure 100 is to be installed on the control rod actuator parts 12 under normal or hot nuclear power equipment operating condition, for correct positioning on control rod actuator parts 12, parts 12 will stand radially outwards or laterally to move, and redirecting of tilting; Heating with the condition of booster-type under, with the convenience of bringing in the work, under this mounting condition, the design feature that earthquake supporting structure 100 has among the figure to be enumerated.Otherwise, if be under cold appointed condition, to install and earthquake supporting structure 100 is adjusted in the location for example, meeting big stress will produce in structure 100 and control rod actuator parts 12, when equipment is in work and has obtained the condition of heating and supercharging, will consider that control rod actuator parts 12 will be through redirecting that above-mentioned radius vector is outwards moved and tilted.Therefore, if desired under cold appointed condition, the earthquake supporting structure is installed on the control rod actuator parts 12, the earthquake supporting structure must make after the improvement like that, for example, that hole identical with the hole 104 of basic part 102, on basic part 102, just should have a few eccentric a little, like this, when equipment changes duty over to, control rod actuator parts 12 will be subjected to above-mentioned radially moving with inclination, but control rod actuator parts and earthquake supporting structure system will can not be subjected to above-mentioned stress, and this stress will be tending towards revealing under opposite situation.Earthquake supporting structure after suitably utilizing the remote monitoring TV and improving together, guarantee that the eccentric earthquake supporting structure of installing is actually correct being installed on the control rod actuator parts 12, so that adjustment component 12 radially moves with inclination under the appointed condition of heat.

Certainly, in order to prepare that earthquake supporting structure 100 is installed on the control rod actuator parts 12, at first in the range observation of carrying out under the condition of work of heat between each control rod actuator parts.So this measurement just can get the size of slice 146, thin slice 146 is to be fixed on the outside surface of adjusting piece 126.For example, with trip bolt thin slice 146 being contained in the reason of adjusting (not shown) on the piece 126 is, start the sizable radially adjustment that makes moving radially of adjustment piece 126 generations can not realize respectively being adjacent to 100 of seismic supports with starting piece 130, because, starting piece 130 can only be with respect to adjusting the piece 126 predetermined numerical value that moves up, and this is to start piece 130 and adjusting correct load path between the piece 126 in order to keep determining.Therefore, in fact can understand like this, be adjacent to radial space adjustment big between the seismic support 100, realize, and be adjacent to the accurate adjustment in the space of 100 of seismic supports, then finish by adjusting moving radially of piece 126 with the mutual layout of thin slice 146.

As can be seen from Figure 6, when middle earthquake is supported on the 100 control rod actuator sealing shrouds 20 that are mounted in separately, if the overlapping parts 30-34 of coil and its connecting duct 38 are during by such mode arrangement, just realized best adjustment result, reach two cross facets of adjusting between the piece 126 of any seismic bearing system 100, will vertically be arranged into the similar cross facet of arbitrary adjacent seismic support medially 100.Like this when considering single seismic bearing system 100, just can special seismic bearing system 100 interior interior realizations of unique cross facet in office adjust, the total-grid of local seismic support system 100 arranges it is during by shown in Figure 6 the installation, just can realize adjusting in two cross facets to arbitrary seismic bearing system 100.Each angle that it shall yet further be noted that basic part 102 all has been cut off, and as 148 among Fig. 4, can know from Fig. 6 and recognize that the characteristics of this structure are to be convenient to being fitted to each other of adjacent foundation spare 102.When being applied to control rod actuator 12, rigidity for structure, become total-grid with seismic support structure 100 cloth fully, earthquake sustained ring 150 has an irregular inside surface that matches with ground seismic support basic part 102, round the grid of above-mentioned earthquake supporting structure 100.Sustained ring 150 can be welded into or be screwed in together with bolt by several different parts in addition, or makes an integral structure component, and the former is the viewpoint of making and carrying from being convenient to mostly.In order to support earthquake ring 150, with by the 100 formed rigid grids of seismic support medially of the present invention, earthquake sustained ring 150 is fixed on (not shown) on the control rod actuator of nuclear reactor and the displacer bar gear train sleeve part reliably, this sleeve part in turn is fixed on again on the pressure container apparatus of reactor (also not drawing), and the latter is fixed in suitable supporting on the building wall of equipment (also not drawing).

From Fig. 6, can further find out, according to control rod actuator of the present invention seismic support structure is medially arranged, and displacer bar gear train does not have, think that any yaw motion at crosswise fixed displacer bar gear train parts 14 is desirable, ring or impact damper (not shown) can be used for linking to each other with displacer bar gear train parts 14, so that interact with ground of the present invention seismic support basic part 102.The impact damper of these displacer bar gear train parts or ring are can be fixed on reliably on the predetermined axial line position of position index line coil component of bar of displacer bar gear train, so as with seismic support basic part 102 collaborative works medially.

Claims (7)

1, the seismic bearing system of a nuclear reactor control rod actuator cover, this reactor comprises a container with closing device, with the many control rod actuators (CRDMS) that make progress from nuclear reactor closing device protrusion, each control rod actuator all has a sealing shroud, the drive link of control lever is housed in cover, its characteristics are that the seismic support medially of all control rod actuators interacts, and each ground seismic support all encloses sealing shroud of volume and is connected with adjacent ground seismic support.

2, as desired seismic bearing system in claim 1, the position index line coil component of bar is to be contained on the control rod actuator, be characterized in seismic support medially be positioned on bar position index line coil component than the lower end.

3, as desired in claim 1 and 2, its characteristics are to have the device of adjusting the adjacent work of seismic support medially connection.

4, middle seismic bearing system as desired in the claim 3, its characteristics are that this adjusting gear has an adjustment piece that can move radially, each is adjusted piece and also has an oblique lozenges; Also having than adjusting gear can axially movable startup piece, also has the lozenges that matches with the lozenges of adjusting piece on this piece, start piece when axis moves up, the lozenges that starts piece interacts with the lozenges of adjusting piece, just forces the adjustment piece radially to move to the control lever drive sleeve and joins.

5, seismic bearing system as desired in claim 4, its characteristics are that remote adjusting gear comprises a starter motor that protrudes upward that is contained on the seismic support medially, and upwards reach the upper area of control rod actuator.

6, as each the desired the sort of seismic bearing system in claim 1 to 5, its characteristics be each medially seismic support a big square profile is all arranged, the adjustment piece that can move radially is to be contained in the place, two diagonal angles of seismic support squarely, by central shaft and two determined cross facets of relative angle that the ground seismic support of adjusting piece is housed is vertically to be arranged in to be equipped with to adjust piece, the similar cross facet place of arbitrary adjacent ground seismic support.

7, as each the desired the sort of supporting system in patent requires 1 to 6, its characteristics are that the earthquake sustained ring is all around around the seismic support medially of array, this medially seismic support be installed on the control rod actuator, the earthquake sustained ring also is fixed on the closing device of nuclear reactor so that the seismic support medially of constraint array.

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