Guide cylinder simulation piece for reactor internals flow-induced vibration test and design method

Abstract

The invention provides a guide cylinder simulation piece for a reactor internal flow-induced vibration test and a design method, the guide cylinder simulation piece is used for installing a pressure pulsation sensor in the reactor internal flow-induced vibration test, and the design method comprises the following steps: S1, designing a guide cylinder body of the guide cylinder simulation piece; s2, designing a mass block in the guide cylinder simulation piece and designing the layout position of the mass block; s3, the rigidity of the guide cylinder simulation piece is calculated, and whether the modal frequency of the guide cylinder simulation piece meets the requirement or not is judged; and S4, performing hydraulic flow field analysis on the upper cavity of the reactor after the guide cylinder simulation piece is mounted, and judging whether the deviation between the pressure distribution of the position of the guide cylinder simulation piece and the pressure distribution of the position after the guide cylinder product piece is mounted meets the requirement or not. According to the invention, the flow area, mass distribution and dynamic characteristics of the guide cylinder simulation piece are ensured to be consistent with the height of the guide cylinder product piece, the characteristics meet the flow-induced vibration test requirements, and the installation problem of the sensor on the guide cylinder in the reactor internal flow-induced vibration test is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of design analysis and test measurement of flow-induced vibration of in-pile components, and in particular to a guide tube simulation component for flow-induced vibration testing of in-pile components and a design method thereof. Background Art

[0002] Core internals are critical equipment in nuclear power plant reactors. Installed within the reactor pressure vessel, they support the fuel assemblies and provide positioning and guidance for the control rod drive mechanisms. During nuclear power plant operation, the flow-induced vibration characteristics of core internals subjected to reactor coolant impact are crucial. For prototype core internals, core internals flow-induced vibration testing is typically conducted during the plant's hot functional testing to measure the flow-induced vibration characteristics of key components.

[0003] It is usually necessary to measure the pressure pulsation at the outlet of the hanging basket of the in-core component. The pressure pulsation sensor needs to be installed on the guide cylinder assembly at the outlet. The pressure pulsation sensor needs to be reliably fixed by bolts, and the bolt fixing plate usually needs to be welded to the wall of the guide cylinder.

[0004] The guide tube is an important component of the reactor drive line. Its manufacturing and installation precision are very high. There is a risk of welding deformation when welding bolt fixing plates on its outer wall, which will affect the centering accuracy of the drive line.

[0005] In order to avoid the risk of deformation caused by welding of the guide tube, it is necessary to install a guide tube simulation part on the in-pile component during the hot test of the flow-induced vibration test of the in-pile component to replace the formal guide tube to simulate the stiffness, mass and fixing method of the formal guide tube. The guide tube simulation part is also used for the installation of the pressure pulsation sensor to meet the requirements of the flow-induced vibration test of the in-pile component.

[0006] In view of this, the inventors of the present application have designed a guide tube simulation component and a design method for flow-induced vibration testing of in-pile components, in order to overcome the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defect in the prior art of lacking a guide tube simulation part installed on the in-pile component during the hot test of the flow-induced vibration test of the in-pile component to replace the formal guide tube, and provide a guide tube simulation part and design method for the flow-induced vibration test of the in-pile component.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] The present invention provides a method for designing a guide tube simulation part for a flow-induced vibration test of an in-core component. The method is characterized in that the guide tube simulation part is used for installing a pressure pulsation sensor in a flow-induced vibration test of an in-core component. The method for designing the guide tube simulation part comprises the following steps: S1, designing a guide tube body of the guide tube simulation part; S2, designing a mass block inside the guide tube simulation part, and designing a layout position of the mass block; S3, calculating the stiffness of the guide tube simulation part, and judging whether the modal frequency of the guide tube simulation part meets the requirements; S4, performing a hydraulic flow field analysis on the upper chamber of the reactor after the guide tube simulation part is installed, and judging whether the pressure distribution at the position of the guide tube simulation part and the pressure distribution deviation at the position after the guide tube product part is installed meet the requirements.

[0010] According to one or more embodiments of the present invention, in step S1, the guide cylinder body of the guide cylinder simulation part is made of a square plate shell, and the material of the guide cylinder body of the guide cylinder simulation part is the same as that of the guide cylinder body of the guide cylinder product part.

[0011] According to one or more embodiments of the present invention, step S2 includes the following steps: 21 2. According to the flow area inside the guide plate of the guide cylinder product, design the mass block inside the guide cylinder simulation part, and use the mass block to simulate the guide plate of the guide cylinder product part to ensure that the flow area inside the guide cylinder simulation part is consistent with the flow area inside the guide cylinder product part; S 22 2. According to the mass and distribution of the guide plate of the guide cylinder product, design the layout position of the internal mass block of the guide cylinder simulation part to ensure that the overall mass and mass distribution of the guide cylinder simulation part are consistent with the guide cylinder product part.

[0012] According to one or more embodiments of the present invention, in step S3, the stiffness of the guide cylinder simulation component is calculated to determine whether the first four modal frequencies of the guide cylinder simulation component satisfy the corresponding modal frequency deviation of the guide cylinder product component by less than 5%; if satisfied, proceed to step S4; if not satisfied, return to step S1.

[0013] According to one or more embodiments of the present invention, in step S3, target values of the first four modal frequencies of the guide cylinder simulation component are 58 Hz, 62 Hz, 161 Hz and 162 Hz, respectively.

[0014] According to one or more embodiments of the present invention, in step S4, a hydraulic flow field analysis is performed on the upper chamber of the reactor after the guide cylinder simulation is installed to determine whether the pressure distribution at the position of the guide cylinder simulation and the pressure distribution at the position after the guide cylinder product is installed are less than 5%; if so, the design of the guide cylinder simulation is completed; if not, the process returns to step S1.

[0015] The present invention also provides a guide tube simulation part for flow-induced vibration testing of in-pile components, which is characterized in that the guide tube simulation part is designed using the design method of the guide tube simulation part for flow-induced vibration testing of in-pile components as described above, and the guide tube simulation part is used for installing a pressure pulsation sensor in the flow-induced vibration testing of in-pile components. The guide tube simulation part includes a guide tube body and a mass block; the mass block is arranged inside the guide tube body.

[0016] According to one or more embodiments of the present invention, the guide cylinder simulation component further includes a top flange and a bottom flange; the top flange is connected to the upper support plate of the in-core component by bolts, and the bottom flange is connected to the core upper plate by elastic support pins.

[0017] According to one or more embodiments of the present invention, a pressure pulsation sensor is provided on the wall surface of the guide cylinder body, and a sensor wire of the pressure pulsation sensor is provided on the inner side of the guide cylinder body.

[0018] According to one or more embodiments of the present invention, a wire tube is fixed on the inner side of the guide cylinder body, and the sensor wire is arranged in the wire tube.

[0019] According to one or more embodiments of the present invention, a sensor mounting seat is provided on the outer side of the mass block, and the sensor mounting seat is used to mount the pressure pulsation sensor.

[0020] According to one or more embodiments of the present invention, a mounting hand hole is provided on the wall surface of the guide cylinder body, and a cover plate is provided on the mounting hand hole.

[0021] According to one or more embodiments of the present invention, the height of the guide cylinder simulation part is 2000mm~3000mm, the guide cylinder body is a square tube structure, the length and width dimensions of the guide cylinder body are 170mm×170mm~210×210mm, and the wall thickness of the guide cylinder body is 5mm~10mm.

[0022] According to one or more embodiments of the present invention, a continuous mass block is provided at the bottom of the guide cylinder body, and four or seven mass blocks are provided at the upper middle portion of the guide cylinder body.

[0023] The positive progress effect of the present invention is:

[0024] The guide tube simulation component and design method for flow-induced vibration testing of in-pile components of the present invention have the following advantages:

[0025] The design method of the guide tube simulation part for the flow-induced vibration test of the in-pile component of the present invention can ensure that the flow area, mass distribution and dynamic characteristics of the guide tube simulation part are highly consistent with the guide tube product part, so that the mass, stiffness and hydraulic characteristics of the guide tube simulation part can simultaneously meet the requirements of the flow-induced vibration test.

[0026] The guide tube simulation part for flow-induced vibration testing of in-pile components of the present invention can be used for sensor installation during the flow-induced vibration testing of in-pile components. The structure guides and protects the sensor wires. The mass, rigidity, connection method, and external dimensions of the guide tube simulation part are consistent with those of the guide tube product part, and will not affect the flow-induced vibration testing of the in-pile components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which like reference numerals represent like features throughout, wherein:

[0028] Figure 1 It is a structural schematic diagram of an embodiment of a guide tube simulation part for flow-induced vibration testing of in-pile components according to the present invention.

[0029] Figure 2 This is a schematic diagram of the connection structure of the top flange in one embodiment of a guide tube simulation piece for flow-induced vibration testing of in-pile components according to the present invention.

[0030] Figure 3 This is a schematic diagram of the connection structure of the bottom flange in one embodiment of a guide tube simulation piece for flow-induced vibration testing of in-pile components according to the present invention.

[0031] Figure 4 The figure is a schematic diagram of the connection structure between the mass block and the sensor mounting seat in one embodiment of the guide cylinder simulation piece for flow-induced vibration test of the in-pile component of the present invention.

[0032] Figure 5a This is a schematic diagram of the cross-sectional structure of the mass block in one embodiment of the guide tube simulation part for flow-induced vibration test of in-pile components of the present invention.

[0033] Figure 5b It is a cross-sectional schematic diagram of the cross-sectional structure of the guide plate structure in the guide cylinder product.

[0034] Figure 6 The figure is a schematic diagram of optional installation positions of a guide cylinder simulation part for flow-induced vibration testing of in-pile components according to the present invention.

[0035] Figure 7 It is a cross-sectional schematic diagram of an embodiment of a guide tube simulation member for flow-induced vibration testing of in-pile components according to the present invention.

[0036] Figure 8 Schematic diagram of the coolant flow rate simulation in the reactor pressure vessel.

[0037] Figure 9 This is a schematic diagram of the installation position of the pressure pulsation sensor in one embodiment of the guide tube simulation part for flow-induced vibration testing of in-pile components of the present invention.

[0038] Reference numerals

[0039] Guide cylinder body 100

[0040] Installation hand hole 110

[0041] Conduit 120

[0042] Mass 200

[0043] Second mass 200a

[0044] The third mass 200b

[0045] Sensor mount 210

[0046] Top flange 300

[0047] Bolt 310

[0048] Bottom flange 400

[0049] Elastic support pin 410

[0050] Upper support plate 500

[0051] Core upper plate 600

[0052] Pressure pulsation sensor 710

[0053] Sensor wire 720

[0054] Upper guide cylinder assembly 800 DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0056] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts. Furthermore, while the terminology used in the present invention is selected from commonly known and commonly used terms, some of the terms mentioned in this specification may have been selected at the applicant's discretion, with their detailed meanings explained in the relevant sections of the description herein. Furthermore, it is required that the present invention be understood not only by the actual terms used, but also by the meaning implied by each term. Also, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale.

[0057] The present invention provides a method for designing a guide cylinder simulation component for a flow-induced vibration test of an internal component. The guide cylinder simulation component is used to install a pressure pulsation sensor 710 in the flow-induced vibration test of the internal component. The guide cylinder simulation component design method includes the following steps:

[0058] Step S1, designing the guide cylinder body 100 of the guide cylinder simulation component;

[0059] Step S2: Designing the mass block 200 inside the guide cylinder simulation component and the layout position of the mass block 200;

[0060] Step S3, calculating the stiffness of the guide cylinder simulation component to determine whether the modal frequency of the guide cylinder simulation component meets the requirements;

[0061] Step S4: perform a hydraulic flow field analysis on the reactor upper chamber after the guide cylinder simulation is installed to determine whether the pressure distribution at the guide cylinder simulation position and the pressure distribution at the position after the guide cylinder product is installed meet the requirements.

[0062] It should be noted that during the flow-induced vibration test of the in-pile components, it is usually necessary to measure the pressure pulsation at the outlet position of the in-pile component basket. The pressure pulsation sensor 710 needs to be installed on the guide cylinder assembly at the outlet position. The pressure pulsation sensor 710 needs to be reliably fixed by bolts, and the bolt fixing plate usually needs to be welded to the wall of the guide cylinder.

[0063] The guide tube is a critical component of the reactor drive line, requiring high precision in manufacturing and installation. Welding the bolted fixing plate to its outer wall carries the risk of deformation, which can affect the alignment accuracy of the drive line. To avoid this risk of guide tube deformation, a guide tube dummy can be used instead of the actual guide tube during flow-induced vibration testing to install the sensor.

[0064] Since the guide cylinder does not need to perform the function of driving the line during the hot test, the guide cylinder simulation can simplify its guide-related structure and only need to simulate the stiffness, mass and fixing method of the formal guide cylinder. Figure 5a FIG. 1 shows the design structure of the mass block 200 in the first embodiment of the guide cylinder simulation design method of the present invention. Figure 5b The guide plate structure of the guide tube production component is shown. The guide tube dummy clearly simplifies the guide plate structure. Threaded holes can be directly provided on the guide tube dummy for mounting the pressure pulsation sensor 710. After the flow-induced vibration test of the reactor internals and before the reactor is officially operational, the dummy can be removed and replaced with the production guide tube.

[0065] Preferably, the mass block 200 is disposed inside the guide cylinder simulation component and fixed to the guide cylinder shell by welding.

[0066] It should be noted that in the flow-induced vibration test of the in-pile components, the measuring point of the pressure pulsation sensor 710 is preferably close to the outer wall of the guide tube. The pressure pulsation sensor 710 is generally installed at the position where the coolant flow rate is the largest, which is usually on the guide plate at the center height of the basket outlet pipe, that is, close to the second or third layer of guide plates.

[0067] like Figure 6 As shown, I is the pressure vessel inlet (i.e., the reactor coolant inlet), O is the pressure vessel outlet (i.e., the reactor coolant outlet), and P is an optional installation position of the guide cylinder simulation part for the flow-induced vibration test of the in-core component of the present invention, which is close to the pressure vessel outlet O.

[0068] like Figure 8 As shown, the flow rate is the largest at the pressure vessel outlet O, and the flow-induced vibration of the internal components is the most severe, so the pressure pulsation sensor 710 is usually set at this position.

[0069] The design of the guide tube simulation part should not only ensure the reliable installation of the sensor, but also ensure that it will not affect the flow-induced vibration test results of the in-pile components. Therefore, the guide tube simulation part should simulate the mass and stiffness effects of the formal guide tube product.

[0070] In addition to simulating the mass and stiffness of the guide cylinder product, the design of the guide cylinder simulation part should also simulate the hydraulic characteristics of the product guide cylinder to ensure that it does not affect the flow field and truly reflect the flow field characteristics at the measurement position.

[0071] As a preferred embodiment of the guide tube simulation part design method for flow-induced vibration test of in-pile components of the present invention, in step S1, the guide tube body 100 of the guide tube simulation part adopts a square plate shell, and the material of the guide tube body 100 of the guide tube simulation part adopts the same material as the guide tube body 100 of the guide tube product part.

[0072] The design of the guide tube dummy must ensure not only reliable sensor installation but also no impact on the results of the flow-induced vibration test of the in-core components. Therefore, the guide tube dummy must simulate the mass and stiffness effects of the actual guide tube product, and its material and mass distribution must be consistent with those of the actual guide tube product. Therefore, the guide tube dummy uses the same square plate shell as the guide tube product as its body 100, and the same materials as the actual guide tube product.

[0073] As a preferred embodiment of the method for designing a guide cylinder simulation component for flow-induced vibration testing of in-pile components according to the present invention, step S2 includes the following steps:

[0074] Step S 21 2. Design a mass block 200 inside the guide cylinder simulation part based on the flow area B inside the guide plate of the guide cylinder product. Use the mass block 200 to simulate the guide plate of the guide cylinder product part to ensure that the flow area A inside the guide cylinder simulation part is consistent with the flow area B inside the guide cylinder product part.

[0075] Step S 22 2. According to the mass and distribution of the guide plate of the guide cylinder product, the layout position of the internal mass block 200 of the guide cylinder simulation part is designed to ensure that the overall mass and mass distribution of the guide cylinder simulation part are consistent with the guide cylinder product part.

[0076] Preferably, the guide cylinder simulation can be equipped with 4 to 6 layers of mass blocks 200 to simulate the guide plate of the guide cylinder product. The structure of the mass blocks 200 of the guide cylinder simulation can be simplified compared to the guide plate of the guide cylinder product, but the mass and flow area A of the guide cylinder simulation must be consistent with the flow area B of the guide cylinder product.

[0077] like Figure 5a FIG. 1 shows the design structure of the mass block 200 in the first embodiment of the guide cylinder simulation design method of the present invention. Figure 5b The figure shows the guide plate structure of the guide cylinder product. The guide cylinder simulator significantly simplifies the guide plate structure. However, the cross-sectional area of the central opening in the guide cylinder simulator's mass block 200 matches the cross-sectional area of the guide cylinder product's guide plate structure. Consequently, the flow area A of the guide cylinder simulator matches the flow area B of the product. Because flow areas A and B are identical, the flow fields generated by the two are similar. While there are some differences in the internal flow fields, the pressure pulsation sensor 710 is located outside the guide cylinder, resulting in minimal differences in the measured values between the guide cylinder simulator and the product.

[0078] Preferably, the connection method between the guide cylinder simulation part and the in-pile component body is consistent with that of the guide cylinder product part, that is, the top is connected by bolts 310, and the bottom is positioned and supported by cotter pins or elastic support pins 410.

[0079] As a preferred embodiment of the guide tube simulation component design method for flow-induced vibration testing of in-pile components of the present invention, in step S3, the stiffness of the guide tube simulation component is calculated to determine whether the first four modal frequencies of the guide tube simulation component satisfy the corresponding modal frequency deviation of the guide tube product component by less than 5%; if satisfied, proceed to step S4; if not satisfied, return to step S1.

[0080] As a preferred embodiment of the method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components of the present invention, in step S3, the target values of the first four modal frequencies of the guide tube simulation component are 58 Hz, 62 Hz, 161 Hz and 162 Hz respectively.

[0081] By calculating the stiffness of the guide tube simulation part, when its first four modal frequencies are approximately 58Hz, 62Hz, 161Hz, and 162Hz, and the deviation from the corresponding modal frequencies of the guide tube product part is less than 5%, the quality and stiffness effect requirements of the simulated product guide tube can be met.

[0082] As a preferred embodiment of the guide tube simulation part design method for flow-induced vibration test of in-core components of the present invention, in the step S4, a hydraulic flow field analysis is performed on the upper chamber of the reactor after the guide tube simulation part is installed to determine whether the pressure distribution at the position of the guide tube simulation part deviates from the pressure distribution at the position after the guide tube product part is installed by less than 5%; if so, the design of the guide tube simulation part is completed; if not, the process returns to step S1.

[0083] Because the guide cylinder simulator not only simulates the mass and stiffness of the guide cylinder product, it must also simulate the hydraulic characteristics of the guide cylinder product to ensure that it does not affect the flow field and truly reflects the flow field characteristics at the measurement location. Therefore, the guide cylinder simulator's external dimensions, overall structure, flow channel dimensions, and resistance must be consistent with the product.

[0084] Therefore, the guide cylinder dummy uses a square outer shell consistent with the product as its guide cylinder body 100. Furthermore, preferably, the window size on the guide cylinder body 100 of the guide cylinder dummy is also consistent with that of the product. The flow area A of the guide plate simulated by the mass block 200 inside the guide cylinder dummy is also consistent with the flow area B of the guide plate of the product. Flow field analysis of the reactor upper chamber after the guide cylinder dummy was installed revealed that when the pressure distribution at the guide cylinder dummy position deviated by less than 5% from that of the product guide cylinder, the hydraulic characteristics required for simulating the product guide cylinder were met.

[0085] As described above, the design method of the guide tube simulation part for the flow-induced vibration test of the in-pile component of the present invention can ensure that the flow area, mass distribution and dynamic characteristics of the guide tube simulation part are highly consistent with the guide tube product part; combined with the modal frequency calibration and flow field pressure distribution verification, the mass, stiffness and hydraulic characteristics of the guide tube simulation part can be achieved to meet the requirements at the same time, so as to meet the requirements of the flow-induced vibration test of the in-pile component.

[0086] See also Figure 1 - Figure 5 and Figure 7 The present invention also provides a guide tube simulation component for flow-induced vibration testing of in-core components. The guide tube simulation component is designed using the design method for guide tube simulation components for flow-induced vibration testing of in-core components as described above. The guide tube simulation component is used for installing a pressure pulsation sensor 710 in flow-induced vibration testing of in-core components. The guide tube simulation component is used for installing a pressure pulsation sensor 710 in flow-induced vibration testing of in-core components. The guide tube simulation component includes a guide tube body 100 and a mass block 200; the mass block 200 is arranged inside the guide tube body 100.

[0087] It should be noted that the guide tube dummy for flow-induced vibration testing of reactor internals according to the present invention can be used during hot runs of flow-induced vibration testing of reactor internals and can be used to install pressure pulsation sensor 710. The flange connection structure at the top of guide tube body 100 is typically connected to the upper support plate 500 of the reactor internals, while the flange connection structure at the bottom of guide tube body 100 is typically connected to the upper core plate 600.

[0088] Preferably, the mass block 200 is fixed to the guide cylinder 100 by welding, and the weld C between the mass block 200 and the guide cylinder 100 is as follows: Figure 7 shown.

[0089] See also Figure 1 、 Figure 2 and Figure 3 As a preferred embodiment of the guide tube simulation component for flow-induced vibration testing of in-core components of the present invention, the guide tube simulation component also includes a top flange 300 and a bottom flange 400; the top flange 300 is connected to the upper support plate 500 of the in-core component by bolts 310, and the bottom flange 400 is connected to the upper plate 600 of the core by elastic support pins 410.

[0090] like Figure 1 As shown, an upper guide cylinder assembly 800 is further connected to the upper side of the guide cylinder simulation member for flow-induced vibration test of the in-pile components of the present invention.

[0091] It should be noted that the top flange 300 is connected to the upper support plate 500 of the in-core component by bolts 310, and the bottom flange 400 is provided with elastic support pins 410, which are inserted into the upper core plate 600. The top flange 300 is rigidly connected to the upper support plate 500 of the in-core component by bolts 310, which can ensure the precise positioning and stable support of the guide tube simulation component. The bottom flange 400 is connected to the upper core plate 600 by elastic support pins 410, which can allow thermal expansion displacement and absorb vibration energy. This combination design of rigid top and soft bottom accurately simulates the constraint state of the guide tube product in actual reactor operating conditions, ensures the accuracy of test measurements, and improves the safety of the test system under thermal-mechanical coupling loads.

[0092] See also Figure 1 、 Figure 4 and Figure 7 As a preferred embodiment of the guide tube simulation part for flow-induced vibration test of in-pile components of the present invention, a pressure pulsation sensor 710 is provided on the wall surface of the guide tube body 100 , and the sensor wire 720 of the pressure pulsation sensor 710 is provided on the inner side of the guide tube body 100 .

[0093] Preferably, a sensor mounting seat 210 can be connected to the upper part 100 of the second mass block 200a or the third mass block 200b (the second layer mass block or the third layer mass block) for installing the pressure pulsation sensor 710. When the pressure pulsation sensor 710 is installed on the sensor mounting seat 210, the sensor wire 720 is set on the inner side of the guide cylinder body 100.

[0094] like Figure 9 As shown, the position of the second mass block 200a or the third mass block 200b is the position closest to the center of the reactor pressure vessel outlet O, which is the position with the maximum flow rate. It is preferred to set the pressure pulsation sensor 710 at this position.

[0095] join Figure 7 As a preferred embodiment of the guide tube simulation member for flow-induced vibration test of in-pile components of the present invention, a wire tube 120 is fixed on the inner side of the guide tube body 100 , and the sensor wire 720 is arranged in the wire tube 120 .

[0096] It should be noted that the guide tube simulator for flow-induced vibration testing of in-core components of the present invention simulates a guide tube product. The sensor mounting base 210 is connected to the upper portion of the second mass block 200a or the third mass block 200b (the second or third mass layer), and the sensor wire 720 is disposed inside the guide tube body 100. Preferably, a wire conduit 120 is provided inside the guide tube body 100 to protect and guide the sensor wire 720, thereby meeting the requirements of flow-induced vibration testing of in-core components. The lower end of the wire conduit 120 inside the guide tube body 100 is near the root of the sensor wire 720, and the upper end is near the upper flange. The diameter of the wire conduit 120 is approximately 10 to 50 mm and can be welded to the inside of the guide tube simulator using a pipe clamp.

[0097] See also Figure 4 As a preferred embodiment of the guide tube simulation member for flow-induced vibration testing of reactor internals according to the present invention, a sensor mounting seat 210 is provided on the outer side of the mass block 200 . The sensor mounting seat is used to mount the pressure pulsation sensor 710 .

[0098] Preferably, the sensor mounting seat 210 is fixed to the mass block 200 by welding, and the mass block 200 is fixed to the guide cylinder body 100 by welding.

[0099] It should be noted that the sensor mounting base 210 can be used to mount the pressure pulsation sensor 710. The pressure pulsation sensor 710 is typically installed at the location with the highest coolant flow rate, typically on a guide plate near the center of the basket outlet pipe, i.e., on the second or third level of the guide plate. A threaded hole is provided on the sensor mounting base 210. The head of the pressure pulsation sensor 710 faces the outside of the guide cylinder and is flush with the outer wall of the guide cylinder. The sensor wire 720 is located inside the guide cylinder dummy.

[0100] It should be noted that the guide tube simulation part for flow-induced vibration test of the in-pile component of the present invention simulates the guide tube product part, and the sensor mounting seat 210 is connected to the mass block 200 used to simulate the guide plate of the guide tube product part.

[0101] See also Figure 1 As a preferred embodiment of the guide cylinder simulation member for flow-induced vibration test of in-pile components of the present invention, the wall surface of the guide cylinder body 100 is provided with an installation hand hole 110, and a cover plate is provided on the installation hand hole 110.

[0102] It should be noted that the guide cylinder body 100 has several handholes, preferably located above the second mass block 200a or the third mass block 200b (the second or third mass layer). These holes facilitate sensor installation and wiring. The sensor wires 720 are guided upward through the wire conduit 120 inside the guide cylinder dummy to the upper flange of the guide cylinder dummy. After sensor installation, the handholes can be sealed with a cover.

[0103] Preferably, a slot is provided at the bottom of the upper flange so that the wire can be led out from the guide cylinder simulation component.

[0104] As a preferred embodiment of the guide tube simulation part for flow-induced vibration test of in-pile components of the present invention, the height of the guide tube simulation part is 2000mm~3000mm, the guide tube body 100 is a square tube structure, the length and width dimensions of the guide tube body 100 are 170mm×170mm~210×210mm, and the wall thickness of the guide tube body 100 is 5mm~10mm.

[0105] As a preferred embodiment of the guide tube simulation component for flow-induced vibration testing of in-pile components of the present invention, a continuous mass block 200 is provided at the bottom of the guide tube body 100 , and 4 to 7 mass blocks 200 are provided in the middle and upper part of the guide tube body 100 .

[0106] Preferably, several mass blocks 200 are placed at the bottom of the guide cylinder simulation to simulate the mass distribution of the guide cylinder product, ensuring that the overall mass and stiffness of the guide cylinder simulation are consistent with those of the guide cylinder product. Generally, a continuous section of mass blocks 200 is placed at the bottom of the guide cylinder simulation, with 4 to 7 mass blocks 200 placed in the upper middle portion.

[0107] As described above, the guide tube dummy for flow-induced vibration testing of in-core components of the present invention can be used to install sensors during flow-induced vibration testing of in-core components. It guides and protects sensor wires 720 through internal conduit 120 and slots in top flange 300. The guide tube dummy's mass, rigidity, connection method, and dimensions are consistent with those of the original guide tube, and thus have no impact on the flow-induced vibration testing of in-core components. The guide tube dummy has a simple structure and is easy to install, resolving the issue of sensor installation on the guide tube during flow-induced vibration testing of in-core components.

[0108] In summary, the design method for a guide tube simulator for flow-induced vibration testing of in-core components according to the present invention ensures that the guide tube simulator's flow area, mass distribution, and dynamic characteristics are highly consistent with those of the finished guide tube, ensuring that the guide tube simulator's mass, stiffness, and hydraulic properties simultaneously meet the requirements of the flow-induced vibration test. The guide tube simulator for flow-induced vibration testing of in-core components according to the present invention can be used to install sensors during flow-induced vibration testing of in-core components. Its structure guides and protects the sensor wires 720. The guide tube simulator's mass, stiffness, connection method, and overall dimensions are consistent with those of the finished guide tube, and thus will not affect the flow-induced vibration testing of in-core components.

[0109] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A design method for a guide tube simulation part for flow-induced vibration testing of in-pile components, characterized in that: The guide tube simulation part is used for installing the pressure pulsation sensor in the flow-induced vibration test of the in-core component. The design method of the guide tube simulation part includes the following steps: S1. Design the guide cylinder body of the guide cylinder simulation component; S2. Design the mass block inside the guide cylinder simulation component and the layout and position of the mass block; S3. Calculate the stiffness of the guide tube simulation component to determine whether the modal frequency of the guide tube simulation component meets the requirements; S4. Perform hydraulic flow field analysis on the upper chamber of the reactor after the guide tube simulation is installed to determine whether the pressure distribution at the guide tube simulation position meets the requirements compared with the pressure distribution at the same position after the guide tube product is installed.

2. The method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components according to claim 1, characterized in that: In the step S1, the guide cylinder body of the guide cylinder simulation part is made of a square plate shell, and the material of the guide cylinder body of the guide cylinder simulation part is the same as that of the guide cylinder body of the guide cylinder product part.

3. The method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components according to claim 1, wherein: The step S2 comprises the following steps: S 21 2. Design a mass block inside the guide tube simulation part based on the flow area inside the guide plate of the guide tube product. Use the mass block to simulate the guide plate of the guide tube product part to ensure that the flow area inside the guide tube simulation part is consistent with the flow area inside the guide tube product part. S 22 2. According to the mass and distribution of the guide plate of the guide cylinder product, design the layout position of the internal mass block of the guide cylinder simulation part to ensure that the overall mass and mass distribution of the guide cylinder simulation part are consistent with the guide cylinder product part.

4. The method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components according to claim 1, wherein: In step S3, the stiffness of the guide cylinder simulation component is calculated to determine whether the first four modal frequencies of the guide cylinder simulation component satisfy the corresponding modal frequency deviation of the guide cylinder product component by less than 5%; if satisfied, proceed to step S4; if not satisfied, return to step S1.

5. The method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components according to claim 4, characterized in that: In step S3, the target values of the first four modal frequencies of the guide cylinder simulation component are 58 Hz, 62 Hz, 161 Hz and 162 Hz respectively.

6. The method for designing a guide tube simulation component for flow-induced vibration testing of in-pile components according to claim 1, wherein: In step S4, a hydraulic flow field analysis is performed on the upper chamber of the reactor after the guide cylinder simulation is installed to determine whether the pressure distribution at the position of the guide cylinder simulation and the pressure distribution at the position after the guide cylinder product is installed are less than 5%; if so, the design of the guide cylinder simulation is completed; if not, the process returns to step S1.

7. A guide tube simulation part for flow-induced vibration test of in-pile components, characterized in that: The guide tube simulation part is designed using the guide tube simulation part design method for in-pile component flow-induced vibration test as described in any one of claims 1 to 6. The guide tube simulation part is used for the installation of a pressure pulsation sensor in the in-pile component flow-induced vibration test. The guide tube simulation part includes a guide tube body and a mass block; the mass block is arranged inside the guide tube body.

8. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 7, characterized in that: The guide cylinder simulation component further includes a top flange and a bottom flange; the top flange is connected to the upper support plate of the in-core component by bolts, and the bottom flange is connected to the upper plate of the core by elastic support pins.

9. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 7, characterized in that: A pressure pulsation sensor is provided on the wall surface of the guide cylinder body, and a sensor wire of the pressure pulsation sensor is provided on the inner side of the guide cylinder body.

10. The guide tube simulation piece for flow-induced vibration test of in-pile components according to claim 9, characterized in that: A wire tube is fixed on the inner side of the guide cylinder body, and the sensor wire is arranged in the wire tube.

11. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 9, characterized in that: A sensor mounting seat is provided on the outer side of the mass block, and the sensor mounting seat is used to mount the pressure pulsation sensor.

12. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 9, characterized in that: The wall surface of the guide cylinder body is provided with a mounting hand hole, and a cover plate is provided on the mounting hand hole.

13. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 7, characterized in that: The height of the guide cylinder simulation part is 2000mm~3000mm, the guide cylinder body is a square tube structure, the length and width dimensions of the guide cylinder body are 170mm×170mm~210×210mm, and the wall thickness of the guide cylinder body is 5mm~10mm.

14. The guide tube simulation member for flow-induced vibration test of in-pile components according to claim 7, characterized in that: A continuous mass block is provided at the bottom of the guide cylinder body, and 4 to 7 mass blocks are provided at the middle and upper part of the guide cylinder body.

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