JP2011257220A - Fuel handling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel handling machine which is capable of improving earthquake resistance.SOLUTION: A fuel handling machine 1 according to the present invention includes: a bridge rail 10 installed on a floor 3 at the periphery of a nuclear reactor pool 2 in which fuel rods for a nuclear reactor are stored; a bridge 20 comprising bridge wheels 21 traveling on the bridge rail 10 and bridge leg parts 22 freely rotatably holding the bridge wheels 21; a trolley 32 traveling on the bridge 20 in a direction perpendicular to the bridge rail 10; and a gripper 33 provided on the trolley 32 and performing operation of inserting or drawing the fuel rods. Each of the bridge leg parts 22 is provided with support parts 41 away from a side surface 10b of the bridge rail 10. Horizontal force absorbing parts 42 which can absorb force in a substantially horizontal direction are connected between each of the bridge leg parts 22 and the support parts 41.

Description

  The present invention relates to a refueling machine for inserting or withdrawing fuel rods in a nuclear reactor facility.

  2. Description of the Related Art Conventionally, a fuel changer has a structure for preventing the fuel changer from falling down and the wheels of the fuel changer from falling off when an earthquake occurs. For example, the refueling machine has a structure that prevents the refueling machine from overturning and the wheels from falling off by bringing a part having a claw shape into contact with the rail when an earthquake occurs. (For example, refer to Patent Document 1 and Patent Document 2).

  There is also known a fuel exchanger having a guide plate provided along a bridge rail of the fuel exchanger and a buffer member provided on a bridge leg (see, for example, Patent Document 3). In such a refueling machine, when an earthquake occurs, the bridge leg is supported by the guide plate via the buffer member, and the shock when the bridge leg abuts against the guide plate is buffered. At the same time, the refueling machine is prevented from overturning and the wheels from being derailed.

JP-A-62-71894 Japanese Patent No. 3456900 JP 2009-8670 A

  By the way, in recent years, the guidelines for reviewing seismic design for nuclear power generation facilities have been revised. In addition, there is an increasing demand for further improvement of earthquake resistance in nuclear reactor facilities based on recent earthquake damages such as the Hyogoken-Nanbu Earthquake and the Chuetsu-oki Earthquake. Furthermore, not only newly installed fuel exchangers in the future, but also existing fuel exchangers that have already been installed, not only the revised seismic design examination guidelines, but also earthquake motion levels that greatly exceed conventional design seismic motion. Seismic performance is required.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a fuel exchanger capable of improving seismic performance.

  The present invention relates to a fuel exchanger for inserting or withdrawing fuel rods for a nuclear reactor, a bridge rail installed on a floor around a reactor pool in which the fuel rods for the nuclear reactor are housed, and a bridge rail A bridge wheel that travels on the bridge, a bridge having a bridge leg portion that rotatably holds the bridge wheel, a trolley that travels on the bridge in a direction perpendicular to the bridge rail, and the trolley. A gripper for inserting or pulling out fuel rods, a support provided on the bridge leg and spaced from the side surface of the bridge rail, and connected between the bridge leg and the support A substantially horizontal relative displacement occurs between the bridge leg and the bridge rail, and the support portion is placed on the side surface of the bridge rail. When, to provide a refueling machine, characterized in that a substantially horizontal force with a horizontal force absorbing portion capable of absorbing.

  In the fuel changer according to the present invention, the horizontal force absorbing portion may include a laminated rubber.

  Moreover, the fuel changer by this invention WHEREIN: You may make it the said horizontal force absorption part have a damper.

  In the fuel changer according to the present invention, the horizontal force absorbing portion may further include a coil spring.

  In the refueling machine according to the present invention, the support portion may include a buffer member that can be freely attached to and detached from the side surface of the bridge rail.

  In the fuel changer according to the present invention, the support portion may include a support roller that can be freely attached to and detached from the side surface of the bridge rail.

  In the refueling machine according to the present invention, the support portion may be disposed on both sides of the bridge rail.

  In the refueling machine according to the present invention, the support portion may be disposed on both sides of the bridge rail and have a pair of claw portions having a shape along a side surface of the bridge rail. .

  In the refueling machine according to the present invention, the support portion is connected to the horizontal force absorbing portion, and is slidable in a substantially horizontal direction with respect to the bridge leg portion, and the bridge side member. A rail-side member slidable in a substantially vertical direction, a pair of claws connected to the rail-side member and disposed on both sides of the bridge rail and having a shape along the side surface of the bridge rail; A vertical force absorbing portion capable of absorbing a force in a substantially vertical direction may be connected between the bridge side member and the rail side member.

  In the fuel changer according to the present invention, the horizontal force absorbing portion and the vertical force absorbing portion may have a coil spring.

  According to the present invention, seismic performance can be improved.

FIG. 1A is a top view showing an overall configuration of a fuel changer according to a first embodiment of the present invention. FIG.1 (b) is a front view of Fig.1 (a). FIG. 2 is a cross-sectional view showing a configuration around a bridge leg portion of the fuel exchanger according to the first embodiment of the present invention. FIG. 3 is a side view showing the fuel changer according to the first embodiment of the present invention. FIG. 4 is a front view showing the fuel changer according to the first embodiment of the present invention. FIG. 5 is a diagram illustrating a state in which a displacement in a substantially horizontal direction occurs in FIG. 2. FIG. 6 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a third embodiment of the present invention. FIG. 8: is sectional drawing which shows the structure of the bridge leg part periphery of the fuel exchanger in the 4th Embodiment of this invention. FIG. 9 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a fifth embodiment of the present invention. FIG. 10 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a sixth embodiment of the present invention. FIG. 11: is sectional drawing which shows the structure of the bridge leg part periphery of the fuel exchanger in the 6th Embodiment of this invention.

  Hereinafter, a fuel changer according to an embodiment of the present invention will be described with reference to the drawings. Here, the refueling machine is for inserting or withdrawing fuel for the nuclear reactor.

First Embodiment First, a fuel exchanger according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1A, 1B, and 2, the refueling machine 1 includes a bridge rail 10 installed on a floor 3 around a nuclear reactor pool 2 in which nuclear fuel is stored. And a bridge 20 capable of traveling on the bridge rail 10. Among these, the bridge 20 includes a bridge wheel 21 that travels on the bridge rail 10 and a pair of bridge legs 22 that rotatably hold the bridge wheel 21. As shown in FIG. 3, the bridge leg portion 22 extends in the longitudinal direction of the bridge rail 10 (the traveling direction of the bridge 20), and two bridge wheels 21 are held by each bridge leg portion 22. Moreover, the bridge leg part 22 has a rectangular cross section, as shown in FIG.

  As shown in FIG. 1, a trolley rail 30 that extends in a direction orthogonal to the bridge rail 10 is provided on the upper surface of the bridge 20, and the trolley wheels that run on the trolley rail 30 are on the trolley rail 30. A trolley 32 having 31 (see FIG. 3) is provided. In addition, the trolley 32 is provided with a gripper 33 for performing insertion or withdrawal operation of a fuel rod (not shown).

  Such a fuel exchanger 1 is installed so as to straddle the upper part of the reactor pool 2 in order to insert or pull out an arbitrary fuel rod stored in the reactor pool 2.

  As shown in FIG. 2, a T-section steel 11 is embedded in the floor 3 on which the refueling machine 1 is installed. The T-section steel 11 is anchored to an embedded anchor 12 embedded in the floor 3 (not shown). ). The bridge rail 10 is fixed to the T-shaped steel 11 with a clip bolt 14 via a rail clip 13. In this way, the bridge rail 10 is firmly fixed to the floor 3.

  Each bridge leg portion 22 is provided with a support portion 41 spaced from the side surface 10b of the head portion 10a of the bridge rail 10. The support portion 41 includes a substantially L-shaped support portion main body 41a and a contact surface 41b that is provided on the side of the bridge rail 10 of the support portion main body 41a and is detachable from the side surface 10b of the bridge rail 10. is doing. In addition, it is preferable to set the gap between the side surface 10b of the rail 10 for bridge | bridging, and the contact surface 41b of the support part 41 in the range which does not have trouble at the time of normal driving | operation.

  Between the bridge leg portion 22 and the support portion 41, a relative displacement in the substantially horizontal direction occurs between the bridge leg portion 22 and the bridge rail 10, so that the contact surface 41b of the support portion 41 is in contact with the bridge rail 10. A horizontal force absorbing portion 42 that can absorb a substantially horizontal force (for example, seismic force) when connected to the side surface 10b is connected. The horizontal force absorbing portion 42 is composed of a laminated rubber 43 having a substantially horizontal laminated structure. That is, the laminated rubber 43 includes a rubber plate and a steel plate, and has a structure in which the rubber plate and the steel plate are alternately laminated in a substantially horizontal manner. Further, the horizontal force absorbing portion 42 is fixed to the bridge leg portion 22 via a fixing plate 44. The horizontal force absorbing portion 42 has a substantially horizontal elastic coefficient that can prevent the bridge wheel 21 from being detached from the bridge rail 10 when a substantially horizontal seismic force is applied. Is preferred.

  The support portion 41, the horizontal force absorbing portion 42, and the fixing plate 44 described above constitute a leg portion support mechanism 40 for supporting the bridge leg portion 22 on the bridge rail 10. Such a leg support mechanism 40 is arranged inside the bridge rail 10, that is, on the reactor pool 2 side as shown in FIGS. 2, 4, and 5, and as shown in FIG. It is arranged at a plurality of locations along the longitudinal direction of the bridge rail 10. In other words, each bridge leg 22 is provided with a plurality of leg support mechanisms 40.

  As shown in FIG. 3, the bridge wheels 21 move to both ends of the bridge leg portion 22 (the front end portion and the rear end portion in the traveling direction of the bridge 20) in a direction orthogonal to the longitudinal direction of the bridge rail 10. A constraining guide roller 50 is provided. By this guide roller 50, the bridge wheel 21 is guided on the bridge rail 10 and travels. Each guide roller 50 is held at both ends of the bridge leg 22 via a support 51. The support 51 is attached to both ends of the bridge leg 22 by a trigger pin 52. Here, the trigger pin 52 is configured to hold the guide roller 50 and the support 51 at both ends of the bridge leg portion 22 during normal operation, but in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10. When a force equal to or greater than a predetermined value is applied, the bridge leg 22 is disengaged.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, normal operation of the fuel changer 1 will be described.

  During normal operation, as shown in FIGS. 1 (a) and 1 (b), on the bridge rail 10, the bridge wheel 21 is driven to rotate to travel the bridge 20, and after the bridge 20 reaches a desired position, The bridge 20 is stopped. During this time, the trigger pin 52 is not detached from the bridge leg 22, and the guide roller 50 is held by the bridge leg 22. As a result, the bridge wheel 21 is guided by the guide roller 50, and the state where the contact surface 41 b of the support portion 41 is separated from the side surface 10 b of the bridge rail 10 is maintained. Thus, the bridge 20 can smoothly travel on the bridge rail 10.

  Further, the trolley wheel 31 is driven to rotate on the trolley rail 30 to run the trolley 32. After the trolley 32 reaches a desired position, the trolley 32 is stopped.

  In this way, the gripping tool 33 provided on the trolley 32 can be disposed above the desired fuel rod among the fuel rods stored in the reactor pool 2. Thereafter, the fuel rod can be inserted or pulled out using the gripper 33.

  Next, a case where an earthquake occurs in such a fuel exchanger 1 and a substantially horizontal seismic force perpendicular to the longitudinal direction of the bridge rail 10 is loaded on the fuel exchanger 1 will be described.

  In this case, first, when the seismic force in this direction is equal to or greater than a predetermined value, the trigger pin 52 holding the guide roller 50 is detached from both ends of the bridge leg 22. As a result, the bridge wheel 21 is released from the restraining force by the guide roller 50.

  When the trigger pin 52 is removed, the bridge leg portion 22 is relatively displaced with respect to the bridge rail 10 in a substantially horizontal direction (here, left direction in FIGS. 2, 4, and 5). In this case, one (left side in FIG. 4) of the pair of bridge legs 22 moves away from the reactor pool 2 and the other (right side in FIG. 4) bridge leg 22 is Move to the reactor pool 2 side.

  When the bridge leg portion 22 is relatively displaced by a predetermined distance, the contact surface 41b of the support portion 41 provided on the one bridge leg portion 22 contacts the side surface 10b of the bridge rail 10.

  After the abutment surface 41b of the support portion 41 abuts on the side surface 10b of the bridge rail 10, when the bridge leg portion 22 is further displaced in a substantially horizontal direction, a horizontal force composed of the laminated rubber 43 is obtained as shown in FIG. The absorber 42 is elastically deformed in a substantially horizontal direction. Thereby, the seismic force in the substantially horizontal direction can be absorbed. Thereafter, the bridge leg portion 22 is relatively displaced in the original direction (right direction in FIG. 5) by the elastic force of the horizontal force absorbing portion 42.

  During this time, the bridge wheel 21 held by the bridge leg 22 slides on the bridge rail 10, but at least a part of the bridge wheel 21 is supported by the bridge rail 10. In this way, the load of the bridge 20 is supported.

  When a substantially horizontal seismic force is applied in the right direction in FIG. 2, the contact surface 41b of the support portion 41 provided on the other (right side) bridge leg portion 22 shown in FIG. The substantially horizontal seismic force can be absorbed by the horizontal force absorbing portion 42 which is in contact with the side surface 10 b of the rail 10 and is connected between the support portion 41 and the bridge leg portion 22.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative displacement in the substantially horizontal direction occurs between the contact surfaces 41b of the support portion 41 and the side surface 10b of the bridge rail 10, and the horizontal force absorbing portion 42 can absorb the substantially horizontal seismic force. . Thereby, the seismic force applied to the embedded anchor 12 and the rail clip 13 supporting the bridge rail 10 can be reduced, and the seismic performance can be improved.

  In the present embodiment, a stopper (not shown) is provided for preventing the bridge wheel 21 from being removed from the bridge rail 10 when a substantially horizontal seismic force is applied. good. As such a stopper, it is preferable to provide between the support part 41 and the bridge leg part 22, for example.

  In the present embodiment, the support portion 41 and the bridge leg portion 22 can be relatively moved in the substantially horizontal direction, and the horizontal distance between the support portion 41 and the bridge leg portion 22 is regulated. A guide mechanism (not shown) may be provided on the support portion 41. In this case, the horizontal force absorbing portion 42 can be elastically deformed in the substantially horizontal direction, and can be prevented from being displaced in the substantially vertical direction, and the horizontal force absorbing portion 42 can be prevented from being damaged.

  In the present embodiment, the example in which the horizontal force absorbing portion 42 is made of the laminated rubber 43 has been described. However, the present invention is not limited to this, and the horizontal force absorbing portion 42 can absorb a force in a substantially horizontal direction. You may comprise by spring elements, such as a coil spring, a disc spring, a leaf | plate spring, a resin spring, or a magnetic spring comprised by these. Further, the horizontal force absorbing portion 42 may be constituted by an oil damper, a highly viscous fluid damper, a viscoelastic damper, an elastic-plastic damper, a friction damper, a magnetic damper, a high damping rubber, or the like. Furthermore, the horizontal force absorbing portion 42 may be configured by adding the above-described damper to the laminated rubber 43 or the above-described spring element.

  Moreover, in this Embodiment, the leg part support mechanism 40 containing the support part 41 demonstrated the example arrange | positioned inside the rail 10 for bridges (reactor pool 2 side). However, the present invention is not limited to this, and the leg support mechanism 40 may be disposed outside the bridge rail 10 (on the side opposite to the reactor pool 2). Further, the leg support mechanism 40 may be arranged on both sides of the bridge rail 10. In this case, the substantially horizontal seismic force can be absorbed by the horizontal force absorbing portions 42 provided on both sides of the bridge rail 10, and the seismic performance can be further improved.

Second Embodiment Next, referring to FIG. 6, a fuel changer according to a second embodiment of the present invention will be described.

  In the refueling machine according to the second embodiment shown in FIG. 6, the support portion is disposed on both sides of the bridge rail and has a pair of claw portions having a shape along the side surface of the bridge rail. The main difference is that the other configuration is substantially the same as that of the first embodiment shown in FIGS. In FIG. 6, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the support portion 41 is provided on a pair of support portion main bodies 41 a disposed on both sides of the bridge rail 10 and the bridge rail 10 side of each support portion main body 41 a. It has a contact surface 41b that can be freely attached to and detached from the side surface 10b, and a claw portion 60 that is provided below each support body 41a and has a shape along the side surface 10b of the bridge rail 10. Among these, each nail | claw part 60 is freely engageable with the head 10a of the rail 10 for bridges. Each support portion main body 41 a of the support portion 41 is fixed to the substrate 61. In addition, a pair of horizontal force absorbing portions 42 arranged substantially symmetrically with respect to the bridge rail 10 are connected between the substrate 61 and the bridge leg portion 22.

  The support portion 41, the substrate 61, the horizontal force absorbing portion 42, and the fixed plate 44 described above constitute a leg support mechanism 40 for supporting the bridge leg portion 22 on the bridge rail 10.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced relative to the bridge rail 10 in the substantially horizontal direction. Then, the contact surface 41 b of the support portion 41 contacts the side surface 10 b of the bridge rail 10. Thereafter, when the bridge leg portion 22 is further displaced in the substantially horizontal direction, the horizontal force absorbing portion 42 is elastically deformed in the substantially horizontal direction (see FIG. 5). Thereby, the seismic force in the substantially horizontal direction can be absorbed.

  Further, when a substantially vertical seismic force is applied and the bridge leg portion 22 is relatively displaced in the substantially vertical direction (upward in FIG. 2) with respect to the bridge rail 10, the claw portion 60 of the support portion 41 is It engages with the head 10 a of the bridge rail 10. As a result, the fuel exchanger 1 can be prevented from rising.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative displacement in the substantially horizontal direction occurs between the contact surfaces 41b of the support portion 41 and the side surface 10b of the bridge rail 10, and the horizontal force absorbing portion 42 can absorb the substantially horizontal seismic force. . Thereby, the seismic force applied to the embedded anchor 12 and the rail clip 13 supporting the bridge rail 10 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, even when a substantially vertical seismic force is applied, the bridge 20 is formed by engaging the claw portion 60 of the support portion 41 with the head portion 10a of the bridge rail 10. It is possible to prevent the surface from rising, falling, or the bridge wheel 21 from being removed.

  In addition, according to the present embodiment, since the horizontal force absorbing portions 42 are arranged on both sides of the bridge rail 10, it is possible to further absorb the substantially horizontal seismic force and to improve the seismic performance. Can be further improved.

Third Embodiment Next, referring to FIG. 7, a fuel changer according to a third embodiment of the present invention will be described.

  The fuel exchanger according to the third embodiment shown in FIG. 7 is mainly different in that the horizontal force absorbing portion includes a damper and a coil spring, and other configurations are the same as those of the first embodiment shown in FIGS. This is substantially the same as the embodiment. In FIG. 7, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the horizontal force absorbing portion 42 includes an oil damper 70 capable of absorbing a seismic force in a substantially horizontal direction, and a coil spring 71 provided inside the oil damper 70. Of these, the oil damper 70 includes a damper cylinder 70a, a piston 70b that is provided inside the damper cylinder 70a and is slidable in a direction perpendicular to the longitudinal direction of the bridge rail 10, and a rod 70c connected to the piston 70b. Including. Among these, one end of the above-described coil spring 71 is connected to the piston 70 b, and the other end of the coil spring 71 is connected to the inner wall of the damper cylinder 70 a, and the coil spring 71 is in a direction orthogonal to the longitudinal direction of the bridge rail 10. Are arranged along. Further, the damper cylinder 70 a of the oil damper 70 is fixed to the bridge leg portion 22 via the fixing plate 72.

  A support portion 41 spaced from the side surface 10 b of the bridge rail 10 is provided at the tip of the rod 70 c of the oil damper 70. In the present embodiment, the support portion 41 is made of a buffer member 73, for example, a urethane pad.

  The support portion 41, the oil damper 70, the coil spring 71, and the fixing plate 72 described above constitute the leg support mechanism 40 for supporting the bridge leg portion 22 on the bridge rail 10. As shown in FIG. 7, the leg support mechanism 40 is arranged inside the bridge rail 10 (on the reactor pool 3 side).

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. Then, the buffer member 73 comes into contact with the side surface 10b of the bridge rail 10. Thereafter, when the bridge leg portion 22 is further relatively displaced in the substantially horizontal direction, the seismic force in the substantially horizontal direction is absorbed by the damping action by the oil damper 70 and the elastic action by the coil spring 71. Thereby, the seismic force in the substantially horizontal direction can be absorbed.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative displacement in the substantially horizontal direction occurs between them, the buffer member 73 of the support portion 41 contacts the side surface 10b of the bridge rail 10, and the seismic force in the substantially horizontal direction can be absorbed by the oil damper 70 and the coil spring 71. . Thereby, the seismic force applied to the embedded anchor 12 and the rail clip 13 supporting the bridge rail 10 can be reduced, and the seismic performance can be improved.

  Moreover, according to this Embodiment, since the support part 41 consists of the buffer member 73, when the buffer member 73 contact | abuts to the side surface 10b of the rail 10 for bridge | bridging, an impact can be buffered.

  In the present embodiment, the example in which the horizontal force absorbing portion 42 includes the oil damper 70 and the coil spring 71 has been described. However, the present invention is not limited to this, and instead of the oil damper 70, a highly viscous fluid damper, a viscoelastic damper, an elastic-plastic damper, a friction damper, a magnetic damper, a high damping rubber, or the like may be used. Furthermore, the horizontal force absorbing portion 42 may be configured using the above-described damper without using the coil spring 71.

  In the present embodiment, the example in which the urethane pad as the buffer member 73 is provided at the tip of the rod 70c of the oil damper 70 has been described. However, the present invention is not limited to this, and any material can be used. A support portion 41 may be provided.

  Moreover, in this Embodiment, the leg part support mechanism 40 containing the support part 41 demonstrated the example arrange | positioned with respect to the rail 10 for bridges at the reactor pool 2 side. However, the present invention is not limited to this, and the leg support mechanism 40 may be disposed outside the bridge rail 10 (on the side opposite to the reactor pool 2). Further, the leg support mechanism 40 may be arranged on both sides of the bridge rail 10. In this case, the seismic force in the substantially horizontal direction can be absorbed by the oil dampers 70 and the coil springs 71 provided on both sides of the bridge rail 10, and the seismic performance can be further improved.

Fourth Embodiment Next, a fuel changer according to a fourth embodiment of the present invention will be described with reference to FIG.

  The fuel exchanger according to the fourth embodiment shown in FIG. 8 is mainly different in that the support portion has a buffer member that can be freely attached to and detached from the side surface of the bridge rail. This is substantially the same as the first embodiment shown in FIG. In FIG. 8, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the support part 41 is provided on the bridge rail 10 side of the support part main body 41a and the support part main body 41a, and is provided with a shock-absorbing member 80 that is detachable from the side surface 10b of the bridge rail 10, for example, It has a urethane pad. Further, leg support mechanisms 40 including a support part 41, a horizontal force absorbing part 42, and a fixing plate 44 are arranged on both sides of the bridge rail 10.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. Then, the buffer member 80 comes into contact with the side surface 10b of the bridge rail 10. Thereafter, when the bridge leg portion 22 is further displaced in the substantially horizontal direction, the horizontal force absorbing portion 42 is elastically deformed in the substantially horizontal direction (see FIG. 5). Thereby, the seismic force in the substantially horizontal direction can be absorbed.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative displacement in the substantially horizontal direction occurs between the shock absorbers 80 of the support portion 41 and the side surface 10b of the bridge rail 10 so that the horizontal force absorbing portion 42 can absorb the substantially horizontal seismic force. Thereby, the seismic force applied to the embedded anchor 12 and the rail clip 13 supporting the bridge rail 10 can be reduced, and the seismic performance can be improved.

  In addition, according to the present embodiment, the support portion 41 includes the buffer member 80 that can be separated from and attached to the side surface 10 b of the bridge rail 10, so that the support portion 41 is attached to the side surface 10 b of the bridge rail 10. When contacting, the shock can be buffered.

  Furthermore, according to the present embodiment, the leg support mechanisms 40 including the support portions 41 are disposed on both sides of the bridge rail 10. Thereby, the seismic force in the substantially horizontal direction can be absorbed by the horizontal force absorbing portions 42 provided on both sides of the bridge rail 10, and the seismic performance can be further improved.

  In the present embodiment, the example in which the leg support mechanism 40 including the support 41 is disposed on both sides of the bridge rail 10 has been described. However, the present invention is not limited to this, and the leg support mechanism 40 including the support portion 41 is arranged on one side of the bridge rail 10 (for example, the reactor pool 2 side) as shown in FIG. Anyway.

Fifth Embodiment Next, a fuel changer according to a fifth embodiment of the present invention will be described with reference to FIG.

  The fuel changer according to the fifth embodiment shown in FIG. 9 is mainly different in that the support portion has a support roller that can be freely attached to and detached from the side surface of the bridge rail. This is substantially the same as the first embodiment shown in FIG. In FIG. 9, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the support portion 41 includes a support portion main body 41a and a support roller 81 that is provided on the bridge rail 10 side of the support portion main body 41a and is detachable from the side surface 10b of the bridge rail 10. is doing. Further, leg support mechanisms 40 including a support part 41, a horizontal force absorbing part 42, and a fixing plate 44 are arranged on both sides of the bridge rail 10.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. Then, the support roller 81 comes into contact with the side surface 10 b of the bridge rail 10. Thereafter, when the bridge leg portion 22 is further relatively displaced in the substantially horizontal direction, the horizontal force absorbing portion 42 is elastically deformed in the substantially horizontal direction (see FIG. 5). Thereby, the seismic force in the substantially horizontal direction can be absorbed.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative displacement in the substantially horizontal direction occurs between them, the support roller 81 of the support portion 41 abuts on the side surface 10b of the bridge rail 10, and the horizontal force absorbing portion 42 can absorb the substantially horizontal seismic force. Thereby, the seismic force applied to the embedded anchor 12 and the rail clip 13 supporting the bridge rail 10 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, since the support roller 81 is disposed between the support body 41a of the support portion 41 and the bridge rail 10, the side surface 10b of the bridge rail 10 when the bridge 20 travels. Even when the support roller 81 comes into contact with the support roller 81, the support roller 81 rolls on the side surface 10 a of the bridge rail 10 to reduce the friction between the bridge rail 10 and the bridge 20, thereby smoothing the bridge 20. It can be run.

  Furthermore, according to the present embodiment, the leg support mechanisms 40 including the support portions 41 are disposed on both sides of the bridge rail 10. Thereby, the seismic force in the substantially horizontal direction can be absorbed by the horizontal force absorbing portions 42 provided on both sides of the bridge rail 10, and the seismic performance can be further improved.

  In the present embodiment, the example in which the leg support mechanism 40 including the support 41 is disposed on both sides of the bridge rail 10 has been described. However, the present invention is not limited to this, and the leg support mechanism 40 including the support portion 41 is arranged on one side of the bridge rail 10 (for example, the reactor pool 2 side) as shown in FIG. Anyway.

Sixth Embodiment Next, a fuel exchanger according to a sixth embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG.

  In the fuel changer according to the sixth embodiment shown in FIGS. 10 and 11, the support portion has a bridge side member that is slidable in a substantially horizontal direction with respect to the bridge leg portion, and a substantially vertical direction with respect to the bridge side member. 1 is mainly different from the first embodiment shown in FIGS. 1 to 5 in that it has a rail-side member that is slidable and a claw portion connected to the rail-side member. It is almost the same. 10 and 11, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 10, the support portion 41 is connected to the bridge leg portion 22 via a horizontal force absorbing portion 42, and is slidable in a substantially horizontal direction with respect to the bridge leg portion 22. And a rail side member 91 slidable in a substantially vertical direction with respect to the side member 90.

  That is, an outer frame member 92 that is formed in a substantially rectangular shape and has an inner surface 92 a on which the bridge side member 90 is slidable is fixed to the bridge leg portion 22. Slides in a substantially horizontal direction. Similarly, the bridge side member 90 (inner frame member) is formed in a substantially rectangular shape, and has an inner surface 90 a on which the rail side member 91 can slide. In the bridge side member 90, the rail side member 91 is provided. Slides in a substantially vertical direction.

  The support portion 41 is provided on a pair of support portion main bodies 41a connected to the rail side member 91, and on the bridge rail side 10 of each support portion main body 41a, and is detachable from the side surface 10b of the bridge rail 10. It has a contact surface 41b and a pair of claw portions 60 which are provided below the support body 41a and have a shape along the side surface 10b of the bridge rail 10. Among these, the pair of claw portions 60 are disposed on both sides of the bridge rail 10, and each claw portion 60 is freely engageable with the head portion 10 a of the bridge rail 10.

  The horizontal force absorbing portion 42 is composed of a horizontal coil spring 93 disposed along a substantially horizontal direction, and is disposed on both sides of the bridge side member 90. The horizontal coil spring 93 is configured so that the bridge-side member 90 is disposed near the center of the outer frame member 92 during normal operation.

  A vertical force capable of absorbing a force in a substantially vertical direction when a relative vertical displacement occurs between the bridge leg portion 22 and the bridge rail 10 between the bridge side member 90 and the rail side member 91. The absorption part 94 is connected. The vertical force absorbing portion 94 includes a vertical coil spring 95 disposed along a substantially vertical direction. The vertical coil spring 95 pushes the rail side member 91 upward during normal operation.

  The support portion 41, the horizontal force absorbing portion 42, and the vertical force absorbing portion 94 described above constitute a leg support mechanism 40 for supporting the bridge leg portion 22 on the bridge rail 10. As shown in FIG. 11, such a leg support mechanism 40 is disposed at both ends (front end and rear end) of the bridge leg 22.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. Then, the contact surface 41 b of the support portion 41 contacts the side surface 10 b of the bridge rail 10. Thereafter, when the bridge leg portion 22 is further relatively displaced in the substantially horizontal direction, the bridge side member 90 slides in the substantially horizontal direction inside the outer frame member 92 and the horizontal coil spring 93 absorbs the substantially horizontal seismic force. can do. When the bridge leg portion 22 is further relatively displaced in the substantially horizontal direction, the relative displacement in the substantially horizontal direction of the bridge side member 90 is restrained by the outer frame member 92, and the bridge 20 falls or the bridge wheel 21 is removed. Can be prevented.

  Further, when a substantially vertical seismic force is applied, when the bridge leg portion 22 is displaced upward relative to the bridge rail 10, the claw portion 60 of the support portion 41 is moved to the head of the bridge rail 10. 10a is engaged. Thereafter, when the bridge leg portion 22 is further relatively displaced in the substantially vertical direction, the rail side member 91 slides in the bridge side member 90 substantially vertically downward, and the vertical coil spring 95 absorbs the seismic force in the substantially vertical direction. can do. As a result, the bridge 20 can be prevented from rising. When the rail side member 91 is further displaced in the substantially vertical direction, the displacement in the substantially vertical direction of the rail side member 91 is restrained by the bridge side member 90, and the bridge 20 can be prevented from rising.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are In the meantime, a relative displacement in the substantially horizontal direction occurs, the contact surface 41b of the support portion 41 contacts the side surface 10b of the bridge rail 10, and the horizontal coil spring 93 can absorb the substantially horizontal seismic force. Thereby, the substantially horizontal seismic force loaded on the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, even when a substantially vertical seismic force is applied, the vertical coil spring 95 can absorb the substantially vertical seismic force. Thereby, the substantially vertical seismic force loaded on the bridge 20 and the trolley 32 can be reduced, and seismic performance can be improved.

  Further, according to the present embodiment, the claw portion 60 of the support portion 41 engages with the head portion 10 a of the bridge rail 10. As a result, the bridge 20 can be prevented from rising and falling, or the bridge wheel 21 can be prevented from falling off.

  As mentioned above, although embodiment by this invention has been described, naturally, within the scope of the gist of this invention, these embodiment can also be combined suitably partially. Further, in the present embodiment, various modifications are possible within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Refueling machine 2 Reactor pool 3 Floor 10 Bridge rail 10a Head 10b Side surface 11 T-shaped steel 12 Embedded anchor 13 Rail clip 14 Clip bolt 20 Bridge 21 Bridge wheel 22 Bridge leg 30 Trolley rail 31 Trolley wheel 32 Trolley 33 Grasping tool 40 Leg support mechanism 41 Support part 41a Support part main body 41b Contact surface 42 Horizontal force absorbing part 43 Laminated rubber 44 Fixing plate 50 Guide roller 51 Support 52 Trigger pin 60 Claw part 61 Substrate 70 Oil damper 70a Damper cylinder 70b Piston 70c Rod 71 Coil spring 72 Fixed plate 73 Buffer member 80 Buffer member 81 Support roller 90 Bridge side member 90a Inner surface 91 Rail side member 92 Outer frame member 92a Inner surface 93 Horizontal coil spring 94 Vertical force absorbing portion 95 Vertical coil spring

Claims (10)

In a refueling machine that inserts or pulls out fuel rods for nuclear reactors,
A rail for the bridge installed on the floor around the reactor pool containing the fuel rods for the reactor,
A bridge wheel that travels on the bridge rail, and a bridge leg that rotatably holds the bridge wheel;
A trolley that runs on the bridge in a direction orthogonal to the bridge rail;
A grip provided on the trolley for inserting or pulling out fuel rods;
A support provided on the bridge leg and spaced apart from the side of the bridge rail;
The bridge leg is connected to the support part, and a relative horizontal displacement occurs between the bridge leg and the bridge rail, and the support part is formed on the side surface of the bridge rail. And a horizontal force absorbing portion capable of absorbing a force in a substantially horizontal direction when contacted.   The refueling machine according to claim 1, wherein the horizontal force absorbing portion includes laminated rubber.   The fuel exchanger according to claim 1, wherein the horizontal force absorbing portion includes a damper.   The fuel exchanger according to claim 3, wherein the horizontal force absorbing portion further includes a coil spring.   5. The fuel changer according to claim 1, wherein the support portion includes a buffer member that is detachably attached to the side surface of the bridge rail.   3. The fuel changer according to claim 1, wherein the support portion includes a support roller that is detachably attached to the side surface of the bridge rail. 4.   The fuel changer according to any one of claims 1 to 6, wherein the support portions are arranged on both sides of the bridge rail.   3. The fuel according to claim 1, wherein the support portion includes a pair of claw portions disposed on both sides of the bridge rail and having a shape along a side surface of the bridge rail. switch. The support part is connected to the horizontal force absorbing part and is slidable in a substantially horizontal direction with respect to the bridge leg part, and a rail slidable in a substantially vertical direction with respect to the bridge side member. A side member and a pair of claws connected to the rail side member, disposed on both sides of the bridge rail, and having a shape along the side surface of the bridge rail;
The refueling machine according to claim 1, wherein a vertical force absorbing portion capable of absorbing a force in a substantially vertical direction is connected between the bridge side member and the rail side member.   The fuel changer according to claim 9, wherein the horizontal force absorbing portion and the vertical force absorbing portion have a coil spring.

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