阅读说明：本技术 燃料棒检查与存放装置 (Fuel rod inspection and storage device ) 是由 许小进 谢晨江 章济 叶琛 于 2020-04-10 设计创作，主要内容包括：本发明涉及燃料检查与修复技术领域,尤其涉及一种燃料棒检查与存放装置,包括存放架、竖直支撑在存放架中的存放管以及支撑在存放架顶端的检查架,检查架与存放架之间形成有检查空间,检查架上开设有供燃料棒通过的检查孔及存放孔,检查孔内安装有检测件,存放孔与存放管同轴设置且相连通形成存放通道。燃料棒可通过检查孔由检测件检测后到达检查空间内进行检查,检测检查完毕的燃料棒可在退出检查空间和检查孔后从存放孔经存放通道放入存放管中存放,存放在存放管中的燃料棒也可以从存放通道中取出后进入检查孔和检查空间内进行复检。实现了燃料棒检查与存放的一体化设计与操作,可减少燃料棒检查与存放操作时间,并实现燃料棒的长期存放。(The invention relates to the technical field of fuel inspection and repair, in particular to a fuel rod inspection and storage device which comprises a storage rack, a storage tube vertically supported in the storage rack and an inspection rack supported at the top end of the storage rack, wherein an inspection space is formed between the inspection rack and the storage rack, an inspection hole and a storage hole for fuel rods to pass through are formed in the inspection rack, a detection piece is installed in the inspection hole, and the storage hole and the storage tube are coaxially arranged and communicated to form a storage channel. The fuel rod accessible inspection hole arrives in the inspection space and inspects by detecting the piece after detecting, and the fuel rod that detects the inspection and finish can deposit in depositing the pipe from depositing the hole after withdrawing from inspection space and inspection hole and depositing through depositing the passageway, and the fuel rod of depositing in the pipe also can get into in inspection hole and the inspection space and recheck after taking out from depositing the passageway. The integrated design and operation of fuel rod inspection and storage are realized, the inspection and storage operation time of the fuel rods can be reduced, and the long-term storage of the fuel rods is realized.)

1. The utility model provides a fuel rod inspection and strorage device, its characterized in that, is in including storage rack (1), vertical support storage tube (2) in storage rack (1) and support inspection frame (3) on storage rack (1) top, inspection frame (3) with be formed with inspection space (30) between storage rack (1), set up inspection hole (31) and storage hole (32) that supply the fuel rod to pass through on inspection frame (3), install the test piece in inspection hole (31), storage hole (32) with storage tube (2) coaxial setting just is linked together and forms and deposits the passageway.

2. The fuel rod inspecting and storing apparatus according to claim 1, wherein the storing pipe (2) and the storing hole (32) are provided in plurality, and the storing holes (32) are communicated with the storing pipes (2) in one-to-one correspondence to form the storing channels.

3. The fuel rod inspection and storage device according to claim 2, characterized in that a plurality of the storage tubes (2) are evenly distributed in an array.

4. The fuel rod inspecting and storing device according to claim 1, wherein the storing rack (1) includes a plurality of guide plates (11) provided at intervals in an axial direction of the storing tube (2) and a fixing frame (12) connecting the plurality of guide plates (11), and the storing tube (2) is inserted through the plurality of guide plates (11).

5. The fuel rod inspection and storage device according to claim 1, characterized in that the inspection rack (3) is supported at the top end of the storage rack (1) by means of vertically arranged pins (34).

6. The fuel rod inspection and storage device of claim 1, wherein a guide frame (33) is provided in the inspection hole (31), and the inspection piece is mounted in the guide frame (33).

7. The fuel rod inspection and storage device according to claim 1, further comprising an adapter plate (4) to be matched with a lifting tool, the adapter plate (4) being mounted on the top end of the inspection rack (3).

8. Fuel rod inspection and storage device according to claim 7, characterized in that the adapter plate (4) is detachably connected with the inspection rack (3).

9. The fuel rod inspection and storage device according to claim 1, further comprising a base (5), the bottom end of the storage rack (1) being supported on the base (5).

Technical Field

The invention relates to the technical field of fuel inspection and repair, in particular to a fuel rod inspection and storage device.

Background

During the operation of the nuclear power station, the fuel rods are in a high-temperature high-pressure high-irradiation environment for a long time, and are easy to damage and leak due to the influence of reactor core foreign matters, vibration and water flow impact. After the nuclear power plant is evaluated, the fuel assembly can be repaired by replacing a new rod aiming at the fuel rod suspected to be damaged. The fuel rod suspected of being broken is taken out from the fuel assembly, and is stored in a dedicated container after being checked and determined by visual inspection, eddy current inspection, and the like.

Among the prior art, the inspection device of post irradiation fuel rod is mostly special tool, and special tool and deposit the container mutually independent, and the fuel rod hangs through fuel rod operating means and moves to special tool and examine, and the inspection is confirmed the back rethread fuel rod operating means lift translation and is deposited the container in, and the radioactive substance release probability in the fuel rod is just easily increased to whole operation consuming time. In addition, the existing storage containers for the fuel rods after irradiation are mostly designed to be simply and temporarily stored, and do not have an operation interface of a fuel rod inspection tool and the long-term safe storage capacity of the fuel rods after irradiation in a fuel water pool.

Disclosure of Invention

The present invention provides a fuel rod inspecting and storing device, which can reduce the time for inspecting and storing fuel rods, so as to overcome the above-mentioned defects in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a fuel rod inspection and strorage device, includes storage rack, vertical support deposit the pipe in storage rack and support the inspection frame on storage rack top, is formed with the inspection space between inspection frame and the storage rack, sets up the inspection hole and the deposit hole that supply the fuel rod to pass through on the inspection frame, installs the test piece in the inspection hole, deposit the hole and deposit the coaxial setting of pipe and be linked together and form and deposit the passageway.

Preferably, the storage pipes and the storage holes are provided in plurality, and the plurality of storage holes are communicated with the plurality of storage pipes in a one-to-one correspondence manner to form a plurality of storage channels.

Preferably, the plurality of storage tubes are uniformly distributed in an array.

Preferably, the storage rack comprises a plurality of guide plates arranged along the axial direction of the storage pipe at intervals and a fixing frame connected with the guide plates, and the storage pipe is arranged on the guide plates in a penetrating manner.

Preferably, the inspection rack is supported at the top end of the storage rack by vertically disposed pins.

Preferably, a guide frame is arranged in the inspection hole, and the detection piece is arranged in the guide frame.

Preferably, the device also comprises an adapter plate matched with the hoisting tool, and the adapter plate is arranged at the top end of the inspection frame.

Preferably, the adapter plate is removably connected to the examination shelf.

Preferably, a base is included on which the bottom end of the storage rack is supported.

Compared with the prior art, the invention has the remarkable progress that:

by adopting the fuel rod checking and storing device, the fuel rods to be checked can pass through the checking holes on the checking frame, are detected by the detecting piece and then reach the checking space for checking, the fuel rods which are checked can be placed into the storing tube from the storing holes on the checking frame through the storing channel after exiting from the checking space and the checking holes, and the fuel rods stored in the storing tube can also be taken out from the storing channel and then enter the checking holes and the checking space for rechecking. Therefore, the fuel rod checking and storing device realizes the integrated design and operation of the checking and storing of the fuel rods, can simultaneously realize the checking and storing of the fuel rods, and has no mutual interference with the checking and storing operation, thereby effectively reducing the checking and storing operation time of the fuel rods.

Drawings

FIG. 1 is a perspective view of a fuel rod inspection and storage device according to an embodiment of the present invention.

FIG. 2 is a schematic view of the fuel rod inspection and storage device top section of an embodiment of the present invention in isolation.

FIG. 3 is a schematic top view of a storage rack in a fuel rod inspection and storage apparatus according to an embodiment of the present invention.

FIG. 4 is a schematic view of the fuel rod inspection and storage device of the present invention shown in phantom at the bottom.

FIG. 5 is a schematic front view of a fuel rod inspection and storage device according to an embodiment of the present invention.

Fig. 6 is a schematic sectional view taken along a-a in fig. 5.

FIG. 7 is a top schematic view of a fuel rod inspection and storage device according to an embodiment of the present invention.

FIG. 8 is a schematic view of the operation of the fuel rod inspection and storage device of the present invention.

Wherein the reference numerals are as follows:

1. storage rack 11 and guide plate

111. Top guide plate 112, bottom guide plate

113. Middle guide plate 12 and fixing frame

13. First screw 2, deposit pipe

3. Inspection rack 30 and inspection space

31. Inspection hole 32, storage hole

33. Guide bracket 34, pin

4. Adapter plate 41, dowel hole

42. Jaw groove 43, second screw

5. Base 51, support square

6. Underwater camera 7 and fuel rod operating tool

8. Fuel rod

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 to 8, one embodiment of the fuel rod inspection and storage device of the present invention is shown.

Referring to fig. 1 and 2, the fuel rod inspecting and storing apparatus of the present embodiment includes a storage rack 1, a storage tube 2, and an inspection rack 3. The storage tubes 2 are vertically supported in the storage rack 1, and the storage tubes 2 are used for storing fuel rods. The inspection rack 3 is supported at the top end of the storage rack 1, an inspection space 30 is formed between the inspection rack 3 and the storage rack 1, the inspection space 30 can be used for inspecting the fuel rod placed therein, for example, the inspection space 30 can be used as a window for visually inspecting the fuel rod, and after the fuel rod enters the inspection space 30, the fuel rod can be visually observed, and the surface inspection of the fuel rod is completed. The inspection rack 3 is provided with an inspection hole 31 and a storage hole 32, and the inspection hole 31 and the storage hole 32 can be used for the fuel rod to pass through. The inspection hole 31 is provided with a detection member (not shown in the figure), and the fuel rod can be detected by the detection member when passing through the inspection hole 31, for example, the detection member can be a detection probe, the detection probe can be an externally-penetrating probe and is arranged in the inspection hole 31, and damage detection can be performed on the fuel rod when the fuel rod passes through the inspection hole 31. Preferably, a guide frame 33 may be disposed in the inspection hole 31, the guide frame 33 axially penetrates the interior of the guide frame 33, the detecting element is mounted in the guide frame 33, the fuel rod passes through the guide frame 33, and the guide frame 33 can provide a good guide for the movement of the fuel rod. The storage holes 32 on the inspection rack 3 are coaxially arranged and communicated with the storage tube 2 to form a storage channel for storing and taking out fuel rods. The fuel rods to be inspected pass through the inspection holes 31 on the inspection rack 3, are detected by the detection pieces and then reach the inspection space 30 for inspection, the fuel rods after inspection can be withdrawn from the inspection space 30 and the inspection holes 31 and then are put into the storage tube 2 from the storage holes 32 on the inspection rack 3 through the storage channel for storage, and the fuel rods stored in the storage tube 2 can also be taken out from the storage channel and then enter the inspection holes 31 and the inspection space 30 for rechecking. From this, the fuel rod inspection and strorage device of this embodiment has realized the integrated design and the operation of fuel rod inspection and storage, can realize the inspection and the depositing of fuel rod simultaneously, and inspection and deposit the operation mutually noninterference to can effectively reduce the fuel rod inspection and deposit the operating time, and the fuel rod inspection and strorage device of this embodiment can place in fuel water pool grillwork, thereby can realize depositing for a long time of fuel rod, and realize carrying out periodic inspection to the fuel rod of depositing.

Referring to fig. 2 and 3, in the present embodiment, preferably, a plurality of storage holes 32 are formed in each of the storage tubes 2 and the inspection rack 3, and the plurality of storage holes 32 are communicated with the plurality of storage tubes 2 in a one-to-one correspondence to form a plurality of storage channels, so that a plurality of fuel rods can be stored simultaneously. The number of the storage tubes 2 is not limited, and can be selected according to actual needs, and the number of the storage holes 32 on the inspection rack 3 is the same as the number of the storage tubes 2. For example, in the present embodiment, the number of the storage holes 32 on the storage tube 2 and the inspection rack 3 is 49, and the fuel rods can be stored at the same time in up to 49 groups. Preferably, the plurality of storage tubes 2 are uniformly distributed in an array, and accordingly, the plurality of storage holes 32 are also uniformly distributed in an array on the inspection rack 3. In this embodiment, preferably, there is one inspection hole 31 on the inspection rack 3, the inspection hole 31 is located at the center of the inspection rack 3, and the plurality of storage holes 32 are uniformly distributed around the inspection hole 31 in an array.

Referring to fig. 1, 2 and 4, in the present embodiment, preferably, the storage rack 1 includes a plurality of guide plates 11 disposed at intervals along an axial direction of the storage tube 2 and a fixing frame 12 connecting the plurality of guide plates 11, the storage tube 2 is disposed through the plurality of guide plates 11, and the plurality of guide plates 11 serve to guide and support the storage tube 2 so as to ensure that the storage tube 2 is vertically supported in the storage rack 1. Preferably, the plurality of guide plates 11 may include a top guide plate 111 located at the top end of the storage rack 1, a bottom guide plate 112 located at the bottom end of the storage rack 1, and a plurality of middle guide plates 113 located between the top guide plate 111 and the bottom guide plate 112, the plurality of middle guide plates 113 being uniformly distributed between the top guide plate 111 and the bottom guide plate 112. The fixed frame 12 may include two opposite concave fixed plates, the two concave fixed plates connect the top guide plate 111, the middle guide plate 113 and the bottom guide plate 112 in sequence on two sides of the guide plate 11, so as to form the storage rack 1, the storage tube 2 sequentially penetrates through the top guide plate 111, the middle guide plate 113 and the bottom guide plate 112 along the vertical direction and is vertically supported in the storage rack 1, and the top end and the bottom end of the storage tube 2 are respectively connected and matched with the top guide plate 111 and the bottom guide plate 112. In this embodiment, the number of the middle guide plates 113 is not limited, and may be selected and designed according to the length of the storage tube 2. Referring to fig. 5 and 6, the fixing frame 12 and the guide plate 11 (shown as the bottom guide plate 112 in fig. 6) may be fixedly connected by the first screw 13.

Referring to fig. 1 and 2, in the present embodiment, the inspection rack 3 is preferably supported at the top end of the storage rack 1 by a vertically disposed pin 34. The inspection rack 3 is supported at the top end of the storage rack 1 by the pin 34 so that the inspection rack 3 and the top end of the storage rack 1 have a space therebetween to form the inspection space 30. Preferably, four pins 34 are provided, and the four pins 34 are respectively disposed at four corners of the bottom surface of the inspection rack 3 and connected to the storage rack 1 at four corners of the top end of the storage rack 1, so as to ensure the stable support of the inspection rack 1 on the storage rack 1, and to enable the four pins 34 to be located at the outer edge of the inspection space 30 without interfering with the entry of the fuel rod into the inspection space 30. In this embodiment, four pins 34 are connected to the top guide plate 111 in the storage rack 1. In this embodiment, preferably, the top end of the fixing frame 12 can extend to the bottom end of the inspection frame 3 to be connected with the inspection frame 3, and at this time, the inspection space 30 has two opposite sides covered by the fixing frame 12 and two other sides are open windows for visual inspection. The top end of the fixing frame 12 is connected with the bottom end of the checking frame 3, so that the checking frame 3 and the storage frame 2 can be more stably connected, and the overall stability of the device is ensured. The manner of connecting the top end of the fixing frame 12 to the inspection frame 3 is not limited, and for example, a screw fastening connection may be employed.

Referring to fig. 1, 2 and 7, the fuel rod inspecting and storing device of the present embodiment preferably further includes an adapter plate 4 matched with the lifting tool, and the adapter plate 4 is installed at the top end of the inspecting frame 3. The lifting device is a fuel assembly operating tool and can be used for clamping and lifting the fuel rod inspection and storage device in the embodiment, so that the fuel rod inspection and storage device in the embodiment can be moved, and the lifting device adopts the fuel assembly operating tool in the prior art. The design of adapter plate 4 and the lifting device phase-match of choosing for use have with the hoist and mount interface of hoist and mount instrument looks adaptation, consequently can realize the hoist and mount operation to this embodiment fuel rod inspection and strorage device very conveniently through the cooperation of hoist and mount interface on lifting device and the adapter plate 4, reduce hoist and mount operating time by a wide margin to reduce fuel rod operation risk and personnel and receive the irradiation measurement. Preferably, the pressurized water reactor fuel assembly hoisting interface design is adopted in the embodiment, the adapter plate 4 is provided with a positioning pin hole 41 and a clamping jaw groove 42, the positioning pin hole 41 is used for positioning the hoisting tool, and the clamping jaw groove 42 is used for locking the hoisting tool. The clamping jaw grooves 42 are arranged in the middle of the adapter plate 4, and two positioning pin holes 41 are arranged and are respectively arranged at two opposite corner positions of the adapter plate 4.

Because the adapter plate 4 is installed on the top end of the inspection frame 3, the outer edge part of the adapter plate 4 may shield the partial storage holes 32 on the inspection frame 3, which reduces the usable storage channels, and in order to realize the maximum utilization rate of all the storage channels, in the embodiment, preferably, the adapter plate 4 is detachably connected with the inspection frame 3, and after the fuel rod inspection and storage device of the embodiment are hoisted in place by the cooperation of the adapter plate 4 and a hoisting tool, the adapter plate 4 can be detached from the inspection frame 3, so that the upper part of the inspection frame 3 is not shielded, and all the storage channels can be put into use. The way of detachably connecting the adapter plate 4 and the inspection rack 3 is not limited, for example, in the embodiment, the adapter plate 4 and the inspection rack 3 are connected by the second screws 43, the number of the second screws 43 may be four, the four second screws 43 are respectively arranged at four corners of the adapter plate 4, and the four corners of the top end of the inspection rack 3 are connected with the inspection rack 3.

Referring to fig. 1 and 4, preferably, the fuel rod inspecting and storing apparatus of the present embodiment further includes a base 5 on which the bottom end of the storage rack 1 is supported. In this embodiment, the bottom guide plate 112 of the storage rack 1 is fixedly connected to the base 5. The four corners of the bottom surface of the base 5 are respectively provided with a supporting square 51, and the fuel rod checking and storing device can be stably placed at the bottom of the fuel pool lattice frame through the base 5 and the supporting square 51, so that the stable placement of the fuel rod checking and storing device on the fuel pool lattice frame is ensured.

Referring to fig. 8, the fuel rod inspecting and storing device of the present embodiment may be placed in a fuel pool grid during use, and the detecting element installed in the guide frame 33 may be an eddy current probe, so that damage to the fuel rod and reading of the detection result may be achieved. In order to facilitate the visual inspection of the fuel rods in the inspection space 30 under water, an underwater camera 6 may be disposed in the fuel pool, and the underwater camera 6 is disposed at the outer circumferential side of the inspection space 30 of the fuel rod inspection and storage device of the present embodiment, so that the fuel rods entering the inspection space 30 may be visually inspected at a close distance by the underwater camera 6, thereby realizing the surface inspection of the fuel rods. Of course, the inspection material of the fuel rod inspection and storage device of the present embodiment is not limited to eddy current probe inspection, and the inspection space 30 is not limited to visual inspection, and other inspection such as ultrasonic probe inspection, LVDT (Linear Variable Differential Transformer) probe inspection, and the like may be performed.

Referring to fig. 8, the working principle of the fuel rod inspecting and storing device of the present embodiment in the field is as follows: firstly, assembling the fuel rod checking and storing device of the embodiment at the edge of the fuel pool and fastening the parts of the device, then hoisting the assembled fuel rod checking and storing device into the fuel pool by utilizing the matching of a hoisting tool and an adaptive plate 4 and placing the device at the designated grid position in the fuel pool; then, a field worker grabs the fuel rod 8 to be inspected by using the fuel rod operating tool 7 and moves the fuel rod 8 to be inspected to the position right above the guide frame 33 in the inspection hole 31 on the inspection frame 3, the fuel rod operating tool 7 is slowly descended to enable the fuel rod 8 to pass through the inspection hole 31 on the inspection frame 3, a detection piece (an eddy current probe) is used for detecting and reading detection data, and after the fuel rod 8 enters the inspection space 30, the underwater camera 6 is used for carrying out close visual observation on the fuel rod 8; after the detection and inspection are finished, the fuel rod operating tool 7 is lifted, the fuel rod 8 moves upwards to exit the inspection space 30 and the inspection hole 31, then the fuel rod operating tool 7 is translated to move the fuel rod 8 to the position above the storage hole 32 corresponding to the empty storage tube 2, the fuel rod operating tool 7 is lowered again, the fuel rod 8 is placed into the storage tube 2 through the storage hole 32 through the storage channel, the fuel rod 8 is continuously lowered until the fuel rod 8 completely falls to the bottom of the storage tube 2, the distance from the top end of the fuel rod 8 to the top guide plate 111 is observed, the fuel rod operating tool 7 is loosened and retracted after the fuel rod 8 is determined to be normal, and the inspection and storage operation of the fuel rod 8 is finished.

The fuel rod checking and storing device is suitable for checking and storing irradiated fuel rods (such as spent fuel rods of a nuclear power station) and also suitable for storing pilot test rods and stainless steel substitute rods of the nuclear power station.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.