A storage device for control rod assemblies of VVER reactors

Abstract

The present invention belongs to the field of mechanical design technology, and specifically relates to a storage device for control rod assemblies of VVER reactors. The present invention comprises a stainless steel support plate, an upper organic glass plate, fastening bolts, a lower organic glass plate, and a guide tube; the upper organic glass plate is located in the middle of the upper surface of the stainless steel support plate, and the lower organic glass plate is located below the stainless steel support plate. The upper organic glass plate, the stainless steel support plate, and the lower organic glass plate are fixed in position by fastening bolts, and the top of the guide tube is fixed on the upper organic glass plate, and the bottom is fixed on the lower organic glass plate. The present invention has a simple structure, is light, and has a small volume. It is used to store control rod assemblies of VVER reactors. It is easy to store when not in use and does not occupy new fuel storage grids. When in use, it can be placed on new fuel storage grids to achieve storage of VVER reactor control rod assemblies.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design, and in particular relates to a storage device for a VVER reactor control rod assembly. Background Art

[0002] The control rod assemblies of VVER reactor nuclear power plants are usually inserted into new fuel assemblies or special storage frames for storage before use, while the new fuel assemblies and special storage frames are placed in new fuel storage grids. The fuel assemblies, special storage frames and new fuel storage grids of VVER reactor nuclear power plants are all hexagonal structures.

[0003] Except when the power plant has enough new fuel assemblies to store the control rod assemblies during the first loading, during the rest of the time, if the life of the control rod assemblies in the reactor expires and a large number of control rod assemblies need to be replaced, if the power plant has insufficient new fuel assemblies and skeletons to store the control rod assemblies, some control rod assemblies will not be able to be stored due to insufficient storage space.

[0004] If a large number of new fuel assemblies or special storage skeletons are purchased at this time, it will not only be expensive but also occupy a large inventory. Summary of the invention

[0005] The purpose of the present invention is to provide a VVER reactor control rod assembly storage device, which has a simple structure, is light and small in size. It is used to store VVER reactor control rod assemblies. It is easy to store when not in use and does not occupy new fuel storage grids. When in use, it can be placed on new fuel storage grids to realize VVER reactor control rod assembly storage.

[0006] The technical solution adopted by the present invention is:

[0007] A VVER reactor control rod assembly storage device comprises a stainless steel support plate, an upper organic glass plate, fastening bolts, a lower organic glass plate and a guide tube; the upper organic glass plate is located in the middle of the upper surface of the stainless steel support plate, the lower organic glass plate is located below the stainless steel support plate, the upper organic glass plate, the stainless steel support plate and the lower organic glass plate are fixed in position by fastening bolts, the top of the guide tube is fixed on the upper organic glass plate, and the bottom is fixed on the lower organic glass plate.

[0008] The upper organic glass plate is provided with a plurality of circular perforations and a positioning groove, and the positioning groove is used for the final positioning of the bottom of the star frame of the control rod assembly.

[0009] Among the plurality of circular through holes, the circular through holes located on the outer sides are used for the stainless steel fastening bolts to pass through, and the circular through holes in the center are used for the top fixation of the guide tube and the guidance and passing of the control rods.

[0010] The central circular perforated structure on the upper organic glass plate is divided into three layers, the top of which is a chamfered structure, which plays a guiding role when the absorption rod passes through; the middle is a circular hole with a smaller diameter for the absorption rod to pass through; the bottom is a circular groove with a larger diameter for fixing the top of the guide tube.

[0011] The circular through hole in the center of the stainless steel support plate has a diameter slightly smaller than that of the upper organic glass plate, and is used for the guide tube to pass through and support the upper organic glass plate; the circular through hole on the outside corresponds to the position of the circular through hole on the outside of the upper organic glass plate, and is used for the stainless steel fastening bolts to pass through.

[0012] The lower organic glass plate is used for fixing the lower part of the guide tube, and the circular perforation position on the lower organic glass plate corresponds to the circular perforation position on the upper organic glass plate.

[0013] The circular perforated structure in the center of the lower organic glass plate is divided into two layers, the top of which is a circular groove with a larger diameter for fixing the bottom of the guide tube; the bottom is a circular hole with a smaller diameter for the absorption rod to pass through.

[0014] The guide tube is used for the control rods of the control rod assembly to pass through and to separate each control rod. The top of the guide tube is fixed on the upper organic glass plate; the bottom of the guide tube is fixed on the lower organic glass plate.

[0015] The upper organic glass plate, the lower organic glass plate and the guide tube are made of materials with lower hardness than the control rod, thereby avoiding damage to the control rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention provides a VVER reactor control rod assembly storage device, which has a simple structure, is detachable, and is convenient for maintenance; and is used to store VVER reactor control rod assemblies;

[0018] (2) A VVER reactor control rod assembly storage device provided by the present invention can also be used for the storage of burnable poison assemblies because the burnable poison assemblies and the control rod assemblies have similar structures;

[0019] (3) A VVER reactor control rod assembly storage device provided by the present invention is used in conjunction with a new fuel storage grid and can be placed in the new fuel storage grid without the need for a separate storage site or facility;

[0020] (4) The present invention provides a VVER reactor control rod assembly storage device, positioning grooves, and guide tubes, which can limit the lateral force and displacement of the control rod assembly and the absorber rods during storage, ensuring that the absorber rods of the control rod assembly are isolated from each other and maintained in a vertical state;

[0021] (5) The VVER reactor control rod assembly storage device provided by the present invention is very light and can be carried manually. Its movement is not restricted by lifting equipment or carrying equipment. It uses less material and has better economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A front view of a VVER reactor control rod assembly storage device provided by the present invention;

[0023] Figure 2 A top view of a VVER reactor control rod assembly storage device provided by the present invention;

[0024] Figure 3 It is the front view of the upper organic glass plate;

[0025] Figure 4 Cross-sectional view of upper plexiglass plate;

[0026] Figure 5 It is the front view of the lower organic glass plate;

[0027] Figure 6 This is a cross-sectional view of the lower plexiglass plate;

[0028] In the figure: 1—nut, 2—gasket, 3—upper plexiglass plate, 4—stainless steel support plate, 5—fastening bolt, 6—handle, 7—slat, 8—lower plexiglass plate, 9—guide tube, 10—positioning groove. DETAILED DESCRIPTION

[0029] A VVER reactor control rod assembly storage device provided by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 1 and Figure 2 As shown, a VVER reactor control rod assembly storage device provided by the present invention comprises a nut 1, a gasket 2, an upper organic glass plate 3, a stainless steel support plate 4, a fastening bolt 5, a handle 6, a slat 7, a lower organic glass plate 8, a guide tube 9, and a positioning groove 10;

[0031] A stainless steel handle 6 is welded on each side of the upper surface of the stainless steel support plate 4 for manually moving the storage device; six strips 7 are welded on the bottom for cooperating with the new fuel storage grid to fix the storage device on the new fuel storage grid; the upper organic glass plate 3 is located in the middle of the upper surface of the stainless steel support plate 4.

[0032] like Figure 3As shown, there are 24 circular perforations and 1 positioning groove 10 on the upper organic glass plate 3. The positioning groove is used for the final positioning of the bottom of the control rod assembly star frame; the 6 outer circular perforations are used for the stainless steel fastening bolts 5 to pass through, and the 18 central circular perforations are used for the top fixation of 18 guide tubes and the guidance and passing of 18 absorption rods; Figure 4 As shown, the 18 circular perforated structures are divided into 3 layers, the top of which is a chamfered structure, which plays a guiding role when the absorption rod passes through; the middle is a circular hole with a smaller diameter for the absorption rod to pass through; the bottom is a circular groove with a larger diameter for fixing the top of the guide tube 9. The material hardness of the entire upper organic glass plate 3 is lower than that of the control rod, which can avoid damage to the control rod.

[0033] The stainless steel support plate 4 is used to bear the weight of the control rod assembly and protect the organic glass plate to prevent it from contacting with the new fuel storage grid and causing collision and scratching. There are 7 circular perforations on the stainless steel support plate 4. The diameter of the circular perforation in the center is slightly smaller than the diameter of the upper organic glass plate 3, which is used for 18 guide tubes 9 to pass through and support the upper organic glass plate 3; the 6 circular perforations on the outside correspond to the 6 circular perforations on the outside of the upper organic glass plate 3, and are used for the stainless steel fastening bolts 5 to pass through.

[0034] like Figure 5 As shown, the lower organic glass plate 8 is used to fix the lower part of the 18 guide tubes 9. There are 24 circular perforations on the lower organic glass plate 8, and their positions correspond to the positions of the 24 circular perforations on the upper organic glass plate 3. The 6 circular perforations on the outside are used for the stainless steel fastening bolts 5 to pass through; the 18 circular perforations near the center are used for the bottom fixation of the 18 guide tubes and the passage of the 18 absorption rods; Figure 6 As shown, the 18 circular perforated structures are divided into two layers, the top of which is a circular groove with a larger diameter for fixing the bottom of the guide tube 9; the bottom is a circular hole with a smaller diameter for the absorption rod to pass through. The hardness of the lower organic glass plate is lower than that of the control rod, which can avoid damage to the control rod.

[0035] 18 guide tubes 9 are used to control the 18 absorption rods of the rod assembly to pass through and separate each absorption rod. The top of the guide tube 9 is placed in the circular groove at the bottom of the upper organic glass plate 3, the outer diameter is equivalent to the diameter of the circular groove, the inner diameter is equivalent to the diameter of the circular hole, and it is fixed on the step formed by the circular groove and the circular hole of the upper organic glass plate 3; the bottom of the guide tube 9 is placed in the circular groove at the top of the lower organic glass plate 8, the outer diameter is equivalent to the diameter of the circular groove, the inner diameter is equivalent to the diameter of the circular hole, and it is fixed on the step formed by the circular groove and the circular hole of the lower organic glass plate 8. The guide tube 9 is made of organic glass, which has a lower hardness than the absorption rod, so as to avoid damaging the absorption rod.

[0036] The storage device is formed by using 6 stainless steel fastening bolts 5 to pass through 6 round holes on the outside of the upper organic glass plate 3, the stainless steel support plate 4, and the lower organic glass plate 8, and fixing the upper organic glass plate 3, the stainless steel support plate 4, and the lower organic glass plate 8 together using 12 nuts 1 and 12 gaskets 2.

[0037] The working principle of the present invention is: the device is stably placed on the new fuel storage grid by the handle 6 of the portable storage device. The strips 7 welded at the bottom of the stainless steel support plate 4 can cooperate with the new fuel storage grid to fix the device;

[0038] Using a lifting machine to move the control rod assembly to the top of the storage device, and using the positioning groove to align the control rod assembly with the storage device;

[0039] The falling control rod assembly allows the 18 absorption rods to pass through the circular perforations of the upper organic glass plate 3, the guide tube 9, and the circular perforations of the lower organic glass plate 8 in sequence, while visually checking this process through the transparent part (organic glass) of the storage device;

[0040] Continue to drop the control rod assembly until the star frame of the control rod assembly is completely located on the positioning groove 10 in the middle of the upper organic glass plate 3, and the storage work of this group of control rod assemblies is completed.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or changes based on the technical scheme and inventive concept of the present invention should be covered within the protection scope of the present invention.

Claims

1. A VVER reactor control rod assembly storage device, characterized in that: It comprises a stainless steel support plate (4), an upper organic glass plate (3), a fastening bolt (5), a lower organic glass plate (8), and a guide tube (9); the upper organic glass plate (3) is located in the middle of the upper surface of the stainless steel support plate (4), the lower organic glass plate (8) is located below the stainless steel support plate (4), the upper organic glass plate (3), the stainless steel support plate (4), and the lower organic glass plate (8) are fixed in position by fastening bolts (5), and the top of the guide tube (9) is fixed on the upper organic glass plate (3), and the bottom is fixed on the lower organic glass plate (8); The upper organic glass plate (3) is provided with a plurality of circular perforations and a positioning groove (10), wherein the positioning groove (10) is used for final positioning of the bottom of the control rod assembly star frame; The central circular perforated structure on the upper organic glass plate (3) is divided into three layers, the top of which is a chamfered structure, which plays a guiding role when the absorption rod passes through; the middle is a circular hole with a smaller diameter, which is used for the absorption rod to pass through; and the bottom is a circular groove with a larger diameter, which is used to fix the top of the guide tube (9).

2. A VVER reactor control rod assembly storage device according to claim 1, characterized in that: Among the plurality of circular through holes, the circular through holes located on the outside are used for fastening bolts (5) to pass through, and the circular through hole in the center is used for fixing the top of the guide tube (9) and guiding and passing the control rod.

3. A VVER reactor control rod assembly storage device according to claim 2, characterized in that: The circular through hole at the center of the stainless steel support plate (4) has a diameter slightly smaller than the diameter of the upper organic glass plate (3) and is used for the guide tube (9) to pass through and support the upper organic glass plate (3); the circular through hole on the outside corresponds to the position of the circular through hole on the outside of the upper organic glass plate (3) and is used for the fastening bolt (5) to pass through.

4. A VVER reactor control rod assembly storage device according to claim 3, characterized in that: The lower organic glass plate (8) is used to fix the lower part of the guide tube (9), and the position of the circular perforation on the lower organic glass plate (8) corresponds to the position of the circular perforation on the upper organic glass plate (3).

5. A VVER reactor control rod assembly storage device according to claim 4, characterized in that: The central circular perforated structure of the lower organic glass plate (8) is divided into two layers, the top of which is a circular groove with a larger diameter, used to fix the bottom of the guide tube (9); and the bottom is a circular hole with a smaller diameter, used for the absorption rod to pass through.

6. A VVER reactor control rod assembly storage device according to claim 5, characterized in that: The guide tube (9) is used for the control rods of the control rod assembly to pass through and to separate each control rod. The top of the guide tube (9) is fixed on the upper organic glass plate (3); and the bottom of the guide tube (9) is fixed on the lower organic glass plate (8).

7. A VVER reactor control rod assembly storage device according to claim 6, characterized in that: The upper organic glass plate (3), the lower organic glass plate (8), and the guide tube (9) are made of materials with a lower hardness than the control rod, thereby avoiding damage to the control rod.

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