JP2013224854A - Fuel handling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an earthquake-proof fuel handling machine that is free of influence on a structure of a fuel handling machine main body and eliminates the need of work such as additional modification.SOLUTION: A fuel handling machine comprises: a bridge travel rail 6 laid across a reactor pool 4; a bridge 2 that has bridge wheels 7 and travels on the bridge travel rail 6; a trolley rail 8 laid on an upper surface of the bridge 2; a trolley 3 that has trolley wheels, travels on the trolley rail 8 and has a gripper 9 for handling fuel; and a laminated rubber 15 that is provided between the bridge travel rail 6 and a surface with the bridge travel rail 6 laid thereon and serves as a seismic isolation mechanism having seismic isolation behavior against vibration in a direction perpendicular to a longitudinal direction of the bridge travel rail 6.

Description

  The present invention relates to a fuel changer.

  Refueling machines are used to refuel nuclear reactors and move various components. The refueling machine travels on a traveling rail installed on a pool of spent fuel, equipment, and the like above the reactor.

  Here, a fall prevention mechanism is provided so that the refueling machine does not cause wheel derailment, overturning, falling into the nuclear reactor, or the like during an earthquake. For example, a claw-type tipping prevention device is attached to the leg so that the rail and the pawl are in contact with each other during an earthquake so that the fuel changer does not fall.

  Further, in order to comply with the latest earthquake resistance guideline, Patent Document 1 described below describes that a guide plate is further provided around the traveling rail in the existing plant, and the shock absorber and the guide plate installed on the legs of the refueling machine at the time of the earthquake. It has been proposed to install a seismic structure that prevents the reversing of the refueling machine from falling and reducing the seismic force applied to the main body.

  Alternatively, as a seismic device for a traveling crane that has a structure that travels on the floor like a fuel changer, a seismic isolation device is installed between the wheel and the crane body to prevent the ground motion from being applied to the crane body. Mechanisms have also been proposed.

JP 2009-8670 A

  In recent years, seismic design requirements for power generation reactor facilities have been revised, and seismic knowledge such as the Chuetsu-oki earthquake has increased the demand for seismic resistance for nuclear reactor equipment.

  In the installation of the guide plate described in Patent Document 1, since it is necessary to lay the plate on the existing fuel exchange floor via an anchor or the like, there is a problem that it can be an obstacle during field work.

  Moreover, in the seismic device of the traveling crane, a significant improvement in the tolerance of the main body can be expected by reducing the input seismic motion transmitted from the floor to the crane main body. However, since it is necessary to install an earthquake-proof device between the traveling device and the main body, there is a problem that the structure of the crane leg is limited and complicated.

  In view of the above circumstances, an object of the present invention is to provide a fuel exchanger having high earthquake resistance without complicating the structure of the fuel exchanger main body.

A fuel changer according to an embodiment of the present invention includes:
A bridge running rail laid across the reactor pool;
A bridge having bridge wheels and traveling on the bridge travel rail;
A trolley rail laid on the upper surface of the bridge;
A trolley having trolley wheels, running on the trolley rail, and having a grip for fuel change;
A seismic isolation mechanism that is provided between the bridge traveling rail and a surface on which the bridge traveling rail is laid, and has a seismic isolation action against vibration in a direction perpendicular to the longitudinal direction of the bridge traveling rail;
It is characterized by providing.

  According to the embodiment of the present invention, a fuel exchanger having high earthquake resistance is realized without complicating the fuel exchanger main body.

The outline drawing which showed schematic structure of the whole fuel exchanger by the 1st-5th embodiment of this invention. The detailed view which showed the structure of the bridge leg part of the fuel exchanger which shows the 1st Embodiment of this invention. The detailed figure which showed the structure of the bridge | bridging leg part of the fuel exchanger which shows the 2nd Embodiment of this invention. The detail figure which showed the structure of the bridge | bridging leg part of the fuel exchanger which shows the 3rd Embodiment of this invention. The side view which showed the structure of the bridge leg part of the fuel exchanger which shows the said 3rd Embodiment. The detailed figure which showed the structure of the bridge | bridging leg part of the fuel exchanger which shows the 4th Embodiment of this invention. The detailed figure which showed the state at the time of the earthquake of the bridge leg part of the fuel exchanger which shows the 4th embodiment. The elements on larger scale of the rotary seat 28 and the rotating shaft 29 which show the same 4th Embodiment. The side view which showed the structure of the bridge leg part of the fuel exchanger which shows the said 4th Embodiment.

  Hereinafter, a fuel changer according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
A fuel changer according to a first embodiment of the present invention will be described with reference to FIGS.

  The plan view of FIG. 1A and the front view of FIG. 1B show the external appearance as a schematic configuration of the entire fuel exchanger.

  The refueling machine 1 is for inserting and withdrawing fuel rods at a nuclear reactor facility or the like, and includes a bridge 2 and a trolley 3 installed thereon. The refueling machine 1 travels on the bridge traveling rails 6 laid on the floors 5 at both ends of the nuclear reactor pool 4 so as to straddle the nuclear reactor pool 4 with the bridge wheels not shown on the surface of the floor 5. To move.

  On the bridge 2, a trolley rail 8 is installed in a direction perpendicular to the bridge travel rail 6. On the trolley rail 8, the trolley 3 having a grip 9 for inserting and withdrawing fuel runs by a trolley wheel (not shown). Thereby, an arbitrary fuel rod in the reactor pool 4 can be grasped and moved.

  The structure of the bridge leg part around the bridge running rail 6 will be described with reference to FIGS. FIG. 2A shows a detailed configuration of the lower part of the bridge travel rail 6 of each refueling machine 1 at normal time and FIG. 2B at the time of earthquake.

  As shown in FIG. 2A, pits 11 are provided in the lower part of the floor 5 in the range where the refueling machine 1 travels, and the contact plates 12 are installed on both side surfaces in the pit 11.

  A base plate 14 is installed on the bottom surface in the pit 11, and the bridge travel rail 6 is fixed on the top surface thereof. Here, the bridge travel rail 6 and the base plate 14 may be formed integrally or may be separately provided and fixed. A laminated rubber 15 is installed as a seismic isolation device between the base plate 14 and the bottom plate 13 on the bottom surface of the pit 11. In addition, it is not limited to the laminated rubber 15, For example, you may install the element with which the fluid was enclosed as an element which has elasticity and damping property.

  Further, an elastic element 17 such as a spring and a damping element 18 such as an oil damper are installed between the side surface of the base plate 14 and the contact plate 12. In place of the elastic element 17 and the damping element 18, an element such as a bag filled with fluid may be installed between the side surface of the base plate 14 and the backing plate 12 as an element having elasticity and damping properties. .

  Further, a magnetic element may be installed so that a repulsive force due to a magnetic force acts between the side surface of the base plate 14 and the contact plate 12.

  Displacement preventing members 16 are respectively installed so as to come into contact with the left and right side surfaces of the base plate 14 in the drawing. The shift stopper 16 is fixed to the bottom plate 13 of the pit 11 with a predetermined strength, and the shift stopper 16 itself is manufactured to have a predetermined strength. The misalignment stopping member 16 may be fixed in the pit 11 by a fixing member such as a bolt, or may be installed in a state of being inserted into a hole provided in the pit 11.

  As a result, during normal travel when no earthquake occurs, traveling stability and traveling accuracy can be maintained by preventing the fuel exchanger 1 from being displaced by the seismic isolation mechanism. When an earthquake occurs, at least one of the displacement preventing members 16 falls off from the bottom plate 13 or the displacement preventing member 16 itself is damaged, so that the seismic isolation mechanism acts on the fuel exchanger 1 and the displacement is displaced in the horizontal direction. Arise.

  The operation of the fuel exchanger according to the first embodiment having such a configuration at the time of an earthquake will be described with reference to FIG.

  When earthquake motion acts on the building where the fuel exchanger 1 is installed, the floor 5 and the pit 11 are displaced to the left and right in the same manner as the building. The laminated rubber 15 is deformed by x in the horizontal direction between the bottom surface of the pit 11 and the base plate 14 due to the inertial force, and the seismic isolation action of the fuel exchanger 1 is obtained. Further, the restoring force of the laminated rubber 15 itself causes an action of restoring the displacement between the fuel exchanger 1 and the floor 5.

  Furthermore, by selecting appropriate element parameters for the elastic element 17 and the damping element 18, it is possible to help restore the displacement between the fuel exchanger 1 and the floor 5, and the seismic isolation mechanism starts to act from the occurrence of an earthquake. Timing, i.e. the triggering seismic force, can be determined.

  Further, as described above, the slip prevention member 16 can maintain traveling stability and traveling accuracy without the seismic isolation mechanism acting on the refueling exchanger 1 during normal traveling when no earthquake occurs.

  As described above, according to the first embodiment, the seismic isolation device having the laminated rubber 15, the elastic element 17, and the damping element 18 installed at the lower part of the bridge traveling rail 6 is used to build the floor of the building with respect to the fuel exchanger 1. Therefore, the seismic force applied to the main body of the fuel exchanger 1 can be greatly reduced.

  Further, with respect to the horizontal seismic force parallel to the bridge traveling rail 6, the bridge wheel 7 freely rotates or slides on the bridge traveling rail 6 to act as a seismic isolation structure of the fuel exchanger 1 body.

(Second Embodiment)
A fuel changer according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the component same as the said 1st Embodiment, and the overlapping description is abbreviate | omitted.

  FIG. 3 shows a detailed configuration of the bridge legs around the bridge travel rail 6 of the fuel changer.

  A plurality of rollers 19 are installed on the upper surface of the bottom plate 13 on the bottom surface of the pit 11 so as to have a rolling axis in a direction parallel to the bridge travel rail 6, and the base plate 14 is installed thereon.

  Thereby, the base plate 14 can freely move horizontally in a direction orthogonal to the bridge travel rail 6. Instead of the roller 19, a plurality of hard spheres, a low friction horizontal sliding bearing, an elastic body or the like may be installed.

  Further, a long hole 20 having a longitudinal direction in a direction orthogonal to the bridge travel rail 6 is formed in the base plate 14. The inside of the long hole 20 is fixed to the floor 5 through the gap 21 so that the anchor 21 can slide. A vertical elastic element 22 acting in the vertical direction is installed between the head of the anchor 21 and the base plate 14.

  In the second embodiment having such a configuration, an operation in the case where a horizontal earthquake motion acting in a direction orthogonal to the bridge traveling rail 6 occurs will be described.

  When the bottom surface of the pit 11 is displaced by a horizontal seismic motion acting in a direction orthogonal to the bridge traveling rail 6, the roller 19 rotates between the top surface of the bottom plate 13 and the base plate 14, and the base plate 14 moves horizontally in the pit 11. Thereby, the seismic force transmitted to the base plate 14 is reduced and acts as a seismic isolation structure of the main body of the fuel exchanger 1. Further, the vertical elastic element 22 also suppresses the lift generated in the base plate 14 due to the vertical seismic force.

  As described above, according to the second embodiment, the bridge traveling rail 6 and the fuel exchanger 1 are isolated by isolating the horizontal ground motion acting in the direction orthogonal to the bridge traveling rail 6 by a rolling mechanism, a sliding mechanism, or an elastic displacement. Seismic force applied to the main body can be greatly reduced.

  Further, with respect to the horizontal seismic force parallel to the bridge traveling rail 6, the bridge wheel 7 freely rotates or slides on the bridge traveling rail 6 to act as a seismic isolation structure of the fuel exchanger 1 body.

(Third embodiment)
A fuel changer according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 4 shows the detailed structure of the lower part of the bridge travel rail 6 of the fuel exchanger 1 from the front direction of the fuel exchanger 1, and FIG. 5 shows the structure from the side direction of the fuel exchanger 1. In addition, the same code | symbol is attached | subjected to the component same as the said 1st, 2nd embodiment, and the overlapping description is abbreviate | omitted.

  Inside the pit 11, a linear guide 23 is installed in a direction orthogonal to the bridge travel rail 6, and a slider plate 24 is installed on the linear guide 23 so as to travel in a direction perpendicular to the bridge travel rail 6. . The linear guide 23 and the slider plate 24 are slidably in contact with each other, but in FIGS. 4 and 5, the gap is emphasized. The bridge travel rail 6 is fixed to the upper surface of the slider plate 24. Here, the slider plate 24 and the bridge travel rail 6 may be integrally formed.

  In the third embodiment having such a configuration, an operation when an earthquake occurs will be described.

  When a horizontal ground motion is applied to the floor 5 in a direction orthogonal to the bridge travel rail 6, the linear guide 23 is displaced together with the floor 5 in the ground motion direction. However, the slider plate 24 travels on the linear guide 23 in the horizontal direction due to inertia. Thereby, it can act as a seismic isolation structure with respect to horizontal ground motion in a direction perpendicular to the bridge travel rail 6.

  Further, with respect to the horizontal seismic force parallel to the bridge traveling rail 6, the bridge wheel 7 freely rotates or slides on the bridge traveling rail 6 to act as a seismic isolation structure of the fuel exchanger 1 body.

(Fourth embodiment)
A fuel changer according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 6 shows the detailed structure of the lower part of the bridge travel rail 6 of the fuel exchanger 1, and FIG. 7 shows the bridge leg 10 of the fuel exchanger when horizontal seismic motion is applied to the floor 5 in the direction perpendicular to the bridge travel rail 6. Shows the state. In addition, the same code | symbol is attached | subjected to the structure same as the said 1st, 2nd and 3rd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, a receiving member 25 having a concave circular arc surface with a large curvature is installed on the bottom surface inside the pit 11. A rotating seat 28 having a smaller curvature than the receiving member 25 and having a convex arcuate surface is installed so as to roll on the surface of the receiving member 25. The rotary seat 28 is connected to the base plate 14 so as to be rotatable about a rotary shaft 29. Further, the surfaces 25a and 28a where the receiving member 25 and the rotary seat 28 come into contact with each other in a stationary state are formed in a flat surface instead of a curved surface. Further, as shown in FIG. 8 in which the vicinity of the rotating shaft 29 in FIG. 6 is enlarged, the rotating seat 28 and the rotating shaft 29 are fixed through a fixing pin 30 as a displacement preventing member. A plurality of the rotary seats 28 are attached in the longitudinal direction of the base plate 14 as shown in FIG. 9 in which the side surface in the vicinity of the base plate 14 and the rotary seat 28 in FIG. 6 is enlarged.

  In the fourth embodiment having such a configuration, an operation when an earthquake occurs will be described.

  Before the occurrence of the earthquake, the surfaces 25a and 28a are flat surfaces, and the rotary seat 28 and the rotary shaft 29 are fixed by the fixing pins 30, so that the posture shown in FIG. 6 is maintained. As shown in FIG. 7, when horizontal seismic motion is applied to the floor 5, the fixing pin 30 is broken and the rotation seat 28 and the rotation shaft 29 are released from being fixed, and the rotation seat 28 follows the curved surface of the receiving member 25. It moves so as to roll while sliding, and is displaced by x in the horizontal direction. Thereby, when a horizontal ground motion is applied to the floor 5 in a direction orthogonal to the bridge travel rail 6, it acts as a seismic isolation structure for the horizontal ground motion transmitted to the main body of the fuel exchanger 1.

  Further, at this time, the rotary seat 28 rotates about the rotary shaft 29, and the base plate 14 maintains the horizontal state. Therefore, in addition to the seismic isolation effect of the third embodiment, it is possible to suppress the main body of the fuel exchanger 1 from being inclined due to an earthquake.

  Further, with respect to the horizontal seismic force parallel to the bridge traveling rail 6, the bridge wheel 7 freely rotates or slides on the bridge traveling rail 6 to act as a seismic isolation structure of the fuel exchanger 1 body.

  In the above-described embodiment, the surfaces 25a and 28a that contact the receiving member 25 and the rotating seat 28 in a stationary state are formed as flat surfaces. Instead, the receiving member 25 and the rotating seat 28 pass through. It is also possible to fix the receiving member 25 and the rotary seat 28 with a fixing pin as a displacement preventing member.

  Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the technical scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the technical scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, the anti-slip member 16 in the first embodiment is installed on the side surface of the base plate 14 in the second to fourth embodiments so that the seismic isolation mechanism acts only when an earthquake force is generated. May be.

DESCRIPTION OF SYMBOLS 1 Refueling machine 2 Bridge 3 Trolley 4 Reactor pool 5 Floor 6 Bridge running rail 7 Bridge wheel 8 Trolley rail 9 Grasp 10 Bridge leg 11 Pit 12 Bump plate 13 Bottom plate 14 Base plate 15 Laminated rubber 16 Slip prevention member 17 Elastic element 18 Damping element 19 Roller 20 Long hole 21 Anchor 22 Vertical elastic element 23 Linear guide 24 Slider plate 25 Receiving material 28 Rotating seat 29 Rotating shaft 30 Fixing pin

Claims (13)

A bridge running rail laid across the reactor pool;
A bridge having bridge wheels and traveling on the bridge travel rail;
A trolley rail laid on the upper surface of the bridge;
A trolley having trolley wheels, running on the trolley rail, and having a grip for fuel change;
A seismic isolation mechanism that is provided between the bridge traveling rail and a surface on which the bridge traveling rail is laid, and has a seismic isolation action against vibration in a direction perpendicular to the longitudinal direction of the bridge traveling rail;
A fuel changer comprising:   The seismic isolation mechanism has a mechanism for isolating a horizontal earthquake, and the mechanism for isolating the horizontal earthquake is configured such that the bridge traveling rail is connected to the surface on which the bridge traveling rail is laid. The fuel changer according to claim 1, further comprising a mechanism for moving in a horizontal direction perpendicular to the traveling rail. A mechanism for isolating the horizontal earthquake is installed at a lower portion of the bridge travel rail, and has a roller having a rotation axis parallel to a longitudinal direction of the bridge travel rail;
The bridge traveling rail is isolated in a horizontal direction perpendicular to the bridge traveling rail by moving the bridge traveling rail in a horizontal direction with respect to a surface on which the bridge traveling rail is laid by rotation of the roller. Item 3. The fuel changer according to Item 2. The mechanism for isolating the horizontal earthquake has a hard sphere installed at the bottom of the bridge running rail,
The bridge traveling rail is isolated in a horizontal direction perpendicular to the bridge traveling rail by moving the bridge traveling rail in a horizontal direction with respect to a surface on which the bridge traveling rail is laid by rotation of the hard sphere. Item 3. The fuel changer according to Item 2.   3. The seismic isolation mechanism is provided between the bridge traveling rail and a surface on which the bridge traveling rail is laid, and has an elastic body that elastically deforms and restores displacement. The refueling machine as described. A linear guide that is installed between the bridge travel rail and a surface on which the bridge travel rail is laid, and that can travel in a horizontal direction orthogonal to the bridge travel rail Have
3. The fuel changer according to claim 2, wherein the bridge traveling rail travels by the linear guide, thereby performing seismic isolation in a horizontal direction perpendicular to the bridge traveling rail. The mechanism for isolating the horizontal earthquake is installed between a side surface of the base plate on which the bridge traveling rail is mounted and a side surface of the pit, and is at least one of an elastic element and a damping element acting in the horizontal direction. Have
The refueling machine according to claim 2, wherein the bridge travel rail is seismically isolated by moving in a horizontal direction via at least one of the elastic element and the damping element. A mechanism for isolating the horizontal earthquake is installed between a bottom surface of the bridge traveling rail and a surface on which the bridge traveling rail is laid, and has an element in which a fluid is sealed;
3. The fuel changer according to claim 2, wherein the bridge travel rail is seismically isolated by moving in a horizontal direction through an element in which the fluid is sealed. The mechanism for isolating the horizontal earthquake includes a magnetic element that is installed between a side surface of the base plate on which the bridge traveling rail is mounted and a side surface of the pit, and has a function of repelling by a magnetic force in the horizontal direction. ,
The refueling machine according to claim 2, wherein the bridge travel rail is seismically isolated by moving in a horizontal direction via the magnetic element. The mechanism for isolating the horizontal earthquake is
One end is fixed to the base plate on which the bridge travel rail is mounted and fixed, and a surface through which the bridge travel rail is laid so as to be slidable through the hole formed in the base plate, 3. The phenomenon according to claim 2, wherein a phenomenon in which the bridge travel rail is lifted in a vertical direction is suppressed by including an elastic element provided so that an elastic action is generated between an end portion and the base plate. Refueling machine. The seismic isolation mechanism is
A rotating seat provided at a lower part of the bridge traveling rail, having a convex arc surface in a direction perpendicular to the bridge traveling rail, and being rotatable about a rotation axis;
A receiving material provided between the rotating seat and the surface on which the bridge traveling rail is laid, and having a concave arc surface having a larger curvature than the rotating seat so that the rotating seat can run while rotating. When,
Have
3. The fuel changer according to claim 1, wherein a seismic force is isolated from a seismic force in a direction orthogonal to the bridge travel rail, and a horizontal displacement of the bridge travel rail is restored by the seismic force. A pit is provided on the floor where the reactor pool is provided, and the seismic isolation mechanism is housed in the pit,
12. The seismic isolation mechanism is provided between the bridge traveling rail and the bottom surface of the pit, or between the bridge traveling rail and the bottom surface and side surface of the pit. A fuel change machine given in any 1 paragraph. A slip stopper member that contacts a side surface of the base plate on which the bridge traveling rail is mounted and that is fixed with a predetermined strength to a surface on which the bridge traveling rail is laid,
13. The seismic isolation mechanism acts when the deviation preventing member is detached from the surface on which the bridge travel rail is laid due to seismic force, or when the deviation preventing member is damaged. A fuel change machine given in any 1 paragraph.

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