Device for testing hydraulic characteristics of primary loop of pool type fast reactor and hot pool flow field measuring device thereof

Abstract

The application relates to the technical field of measuring or monitoring the flow of reactor cooling, in particular to a device for testing the hydraulic characteristics of a primary loop of a pool type fast reactor and a hot pool flow field measuring device thereof. The measuring device comprises a first flow velocity measuring assembly and a second flow velocity measuring assembly, the first flow velocity measuring assembly is arranged on an in-core shield simulation part of the testing device and is used for measuring the coolant flow velocity on the radial inner side of the in-core shield simulation part and in the region above a reactor core simulation part; and the second flow velocity measuring assembly is arranged on an intermediate heat exchanger simulation part of the testing device and is used for measuring the coolant flow velocity at the inlet of the intermediate heat exchanger simulation part. According to the embodiment of the application, the first flow velocity measuring assembly and the second flow velocity measuring assembly are arranged on the in-core shield simulation part and the intermediate heat exchanger simulation part respectively, the flow fields of the hot pools on the radial inner side and the radial outer side of the in-core shield simulation part can be measured, and data support is provided for the study of the thermal hydraulic characteristics of the primary loop of the pool type sodium-cooled fast reactor.

Description

Technical Field

[0001] This application relates to the technical field of measuring or monitoring the flow rate of reactor cooling, and in particular to a test device for the hydraulic characteristics of the primary loop of a pool-type fast reactor and a device for measuring the flow field of its hot pool. Background Technology

[0002] This section is only intended to provide background information relevant to this application and does not necessarily constitute prior art.

[0003] The pool-type sodium-cooled fast reactor is my country's fourth-generation advanced nuclear reactor. The entire primary coolant system (including the core, main pumps, and intermediate heat exchangers) is located within the main vessel. The primary coolant system exhibits complex flow characteristics, and its thermo-hydraulic design is a crucial component of fast reactor design. To verify the thermo-hydraulic characteristics of the primary coolant system, a primary coolant hydraulic characteristic testing device for pool-type fast reactors is incorporated into relevant technologies to conduct thermo-hydraulic experiments.

[0004] Currently, there are still many limitations in verifying the hydraulic characteristics of the primary circuit using a pool-type fast reactor primary circuit hydraulic characteristic testing device. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a hot pool flow field measurement device suitable for a pool-type fast reactor primary loop hydraulic characteristic testing device. The measurement device includes: a first flow velocity measurement component and a second flow velocity measurement component. The first flow velocity measurement component is disposed in the in-core shielding simulation component of the testing device and is used to measure the coolant flow velocity in the region radially inner to the in-core shielding simulation component and located above the core simulation component of the testing device. The second flow velocity measurement component is disposed in the intermediate heat exchanger simulation component of the testing device and is used to measure the coolant flow velocity at the inlet of the intermediate heat exchanger simulation component.

[0007] The embodiments of this application, by setting a first flow velocity measurement component and a second flow velocity measurement component in the inner shielding simulation component and the intermediate heat exchanger simulation component respectively, can measure the flow field of the hot pool on the radial inner side and radial outer side of the in-reactor shielding simulation component respectively, making the measurement of the hot pool flow field more comprehensive, thereby providing data support for studying the thermal-hydraulic characteristics of the primary loop of the pool-type sodium-cooled fast reactor.

[0008] Secondly, embodiments of this application also provide a testing device for the hydraulic characteristics of the primary loop of a pool-type fast reactor. This testing device may include: a pool-type fast reactor simulator, a drive pump, and the hot pool flow field measurement device provided in the first aspect of this application. The pool-type fast reactor simulator is used to simulate the coolant flow channels within a pool-type fast reactor. The drive pump is disposed outside the pool-type fast reactor simulator and is used to deliver coolant into the pool-type fast reactor simulator, so that the coolant flows along the coolant flow channels within the pool-type fast reactor simulator. The hot pool flow field measurement device is configured to measure the coolant flow rate in different hot pool regions of the pool-type fast reactor simulator.

[0009] The embodiments of this application can simulate the coolant flow in a pool-type fast reactor by setting up a pool-type fast reactor simulator and a drive pump set outside the pool-type fast reactor simulator; by setting up a hot pool flow field measurement device to measure the coolant flow rate in different hot pool regions of the pool-type fast reactor simulator, data support can be provided for studying the thermal-hydraulic characteristics of the primary loop of a pool-type sodium-cooled fast reactor.

[0010] These and other advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0011] To further illustrate the above and other advantages and features of this application, the specific embodiments of this application will be described in more detail below with reference to the accompanying drawings. The drawings, together with the following detailed description, are included in and form a part of this specification. Elements having the same function and structure are indicated by the same reference numerals. It should be understood that these drawings only depict typical examples of this application and should not be considered as limiting the scope of this application.

[0012] Figure 1 This is a schematic diagram of a test apparatus for the hydraulic characteristics of the primary loop of a pool-type fast reactor according to an embodiment of this application; Figure 2 This is a schematic diagram of a first velocity measurement component disposed in an in-pile shielding simulation element according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a second flow velocity measuring component according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a first moving member and a second moving member according to an embodiment of this application; Figure 5 yes Figure 4 A partial schematic diagram of the structure shown; Figure 6 This is a schematic diagram showing the second flow rate measurement component positioned in the intermediate heat exchanger simulator and the stack container simulator. Figure 7 This is a schematic diagram of the structure of a flow rate measuring device according to an embodiment of this application.

[0013] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0014] Explanation of reference numerals in the attached figures: 1. In-core shielding simulation component; 11. Upper shielding simulation component; 12. Radial inner shielding simulation component; 6. Reactor container simulation component; 7. Reactor core simulation component; 2. Intermediate heat exchanger simulation component; 3. First flow velocity measuring assembly; 31. First flow velocity measuring component; 32. First connecting assembly; 321. First arc-shaped component; 322. Second arc-shaped component; 323. Connecting component; 33. First moving assembly; 331. First moving component; 3311. Guide rod; 3312. Lead screw; 3313. Base; 33131. Fixed plate; 331310. Rotating mounting seat; 33132. Connecting rod; 33133. Fixed mounting seat; 3314. Sliding seat; 33140. Seat body; 33141. Sliding mounting component; 33142. Lead screw connecting component; 331420. Lead screw mating component; 3315. Flow channel; 332. Second moving component; 333. Third moving component; 334. Second driving component; 4. Second velocity measuring assembly; 41. Second velocity measuring component; 420. Connecting body; 4201. Vertical guide rail; 421. Mounting component; 422. Connecting rod; 43. Second moving assembly; 431. Height moving component; 4311. Horizontal guide rail; 432. Radial moving component; 44. Vertical rod; 51. Ultrasonic transmitting probe; 52. Ultrasonic receiving probe. Detailed Implementation

[0015] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0016] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning as understood by a person with ordinary skills in the field to which this application pertains.

[0018] When verifying the hydraulic characteristics of the primary circuit using a pool-type fast reactor primary circuit hydraulic characteristic testing device, it is necessary to measure the flow field within the hot pool. Currently, there is no suitable hot pool flow field measurement device for a pool-type fast reactor primary circuit hydraulic characteristic testing device.

[0019] Based on this, embodiments of this application provide a hot pool flow field measurement device suitable for a pool-type fast reactor primary loop hydraulic characteristic testing device, used to measure the hot pool flow field.

[0020] See Figures 1 to 3 , Figure 1 This is a schematic diagram of a test apparatus for the hydraulic characteristics of the primary loop of a pool-type fast reactor according to an embodiment of this application; Figure 2 This is a schematic diagram of a first velocity measurement component disposed in an in-pile shielding simulation element according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a second velocity measurement component according to an embodiment of this application; the testing device provided by the embodiments of this application may include an in-core shielding simulator 1 for simulating in-core shielding and an intermediate heat exchanger simulator 2 for simulating an intermediate heat exchanger. The measurement device provided by the embodiments of this application may include: a first velocity measurement component 3 and a second velocity measurement component 4. The first velocity measurement component 3 is disposed on the in-core shielding simulator 1 and is used to measure the radially inner side of the in-core shielding simulator 1 and the region above the core simulator 7 of the testing device (see [link]). Figure 1 The coolant flow rate in area A of the intermediate heat exchanger simulator 2 is measured; the second flow rate measuring component 4 is installed in the intermediate heat exchanger simulator 2 to measure the coolant flow rate at the inlet of the intermediate heat exchanger simulator 2 (see [reference]). Figure 1 The coolant flow rate in region B of the diagram.

[0021] The embodiments of this application, by setting a first flow velocity measurement component 3 and a second flow velocity measurement component 4 in the in-core shielding simulation component 1 and the intermediate heat exchanger simulation component 2 respectively, can measure the flow field of the hot pool on the radial inner and radial outer sides of the in-core shielding simulation component 1, making the measurement of the hot pool flow field more comprehensive, thereby providing data support for studying the thermal-hydraulic characteristics of the primary loop of the pool-type sodium-cooled fast reactor.

[0022] In some embodiments, see Figure 2The first velocity measurement component 3 may include: a first velocity measuring element 31, a first connecting component 32, and a first moving component 33; the first velocity measuring element 31 is used to measure the flow rate of the coolant; the first connecting component 32 is used to connect to the in-core shielding simulation component 1; the first moving component 33 is disposed on the first connecting component 32 and is used to drive the first velocity measuring element 31 to move radially inward on the in-core shielding simulation component 1, so as to measure the flow rate of the coolant in different regions radially inward on the in-core shielding simulation component 1. In this embodiment, the first velocity measuring element 31 can be used to measure the flow rate of the coolant in different regions radially inward on the in-core shielding simulation component 1, thereby making the measurement of the hot pool flow field more comprehensive, and thus providing data support for studying the thermo-hydraulic characteristics of the primary loop of a pool-type sodium-cooled fast reactor.

[0023] The test setup may include a reactor vessel simulator 6, a reactor core simulator 7, an in-core shielding simulator 1, a hot and cold pool separation simulator, a pump simulator, and an intermediate heat exchanger simulator 2. The scale of the test setup to that of a pool-type fast reactor is 1:1.

[0024] The primary loop of the sodium-cooled pool fast reactor is symmetrically arranged. Both the core simulator 7 and the reactor vessel simulator 6 are fan-shaped, with a central angle of 152° corresponding to the fan shape, simulating the primary loop on one side of the pool fast reactor.

[0025] The internal shielding of a pool-type fast reactor includes radial inner shielding, radial outer shielding, central shielding, and upper shielding. The radial inner shielding is located radially outside the reactor core and serves as the first radial layer of shielding. The radial outer shielding is located radially outside the radial inner shielding. Together, the radial outer and radial inner shields form a radial shield to block radiation, ensuring the maximum neutron flux rate within the intermediate heat exchanger. The central shielding is positioned above the radial outer shielding, and the upper shielding is positioned above the central shielding.

[0026] The in-pile shielding simulator 1 is the same as the in-pile shielding structure of the pool-type fast reactor, and also has an upper shielding simulator 11 for simulating the upper shielding and a radial inner shielding simulator 12 for simulating the radial inner shielding.

[0027] In some embodiments, see Figure 2 The first connecting component 32 may include: a first arc-shaped component 321 and a second arc-shaped component 322; the first arc-shaped component 321 is disposed on the upper end face of the upper shielding simulation component 11 of the in-pile shielding simulation component 1; the second arc-shaped component 322 is disposed parallel to the first arc-shaped component 321 on the upper end face of the radial inner shielding simulation component 12 of the in-pile shielding simulation component 1; the first moving component 33 is configured to be able to move along the circumferential direction of the first arc-shaped component 321 and the second arc-shaped component 322.

[0028] In this embodiment, the placement of the first arc-shaped member 321 and the second arc-shaped member 322 has little impact on the coolant flow. Furthermore, the first arc-shaped member 321 and the second arc-shaped member 322 can be placed using the original shielding structure within the testing device, which can minimize their impact on the coolant flow within the in-pile shielding simulation member 1, avoid interference with the measurement results, and thus improve the accuracy of the measurement.

[0029] In a pool-type fast reactor, the coolant level in the hot pool is usually lower than the upper shield of the in-core shield. By setting the first arc-shaped member 321 on the upper end face of the upper shield simulation member 11 of the in-core shield simulation member 1, the first arc-shaped member 321 can be positioned above the hot pool liquid level, thereby avoiding the influence on the coolant flow in the in-core shield simulation member 1.

[0030] The first arc-shaped component 321 is higher than the upper end surface of the upper shielding simulation component 11.

[0031] In some embodiments, the second arcuate member 322 is substantially flush with the radial inner shielding simulator 12 in order to reduce the impact on the coolant flow of the in-pile shielding simulator 1.

[0032] In some embodiments, the second arc-shaped member 322 protrudes radially from the upper shielding simulation member 11, thereby being aligned with the first arc-shaped member 321 and located directly above the first arc-shaped member 321, facilitating the movement of the first moving component 33 along the circumferential direction of the first arc-shaped member 321 and the second arc-shaped member 322.

[0033] The second arc-shaped component 322 has the same upper end face size as the radial inner shielding simulation component 12 to reduce the impact on the coolant flow of the in-pile shielding simulation component 1.

[0034] In some embodiments, both the first arc-shaped member 321 and the second arc-shaped member 322 can be circular arcs. The central angles corresponding to the first arc-shaped member 321 and the second arc-shaped member 322 can be 152°.

[0035] In some embodiments, the minimum moving step of the first moving component 33 along the circumferential direction of the first arcuate member 321 and the second arcuate member 322 can be 0.1°.

[0036] In some embodiments, see Figure 2 The first connecting component 32 may further include a plurality of connectors 323, which are spaced apart and used to mount the first arc-shaped component 321 on the upper end face of the upper shielding simulation component 11.

[0037] In such an embodiment, by arranging multiple connectors 323 at intervals to reduce the number of connectors 323 used, and by forming multiple holes on each connector 323, the weight of the connectors 323 can be reduced, thus avoiding adverse effects on the in-pile shielding simulation component 1.

[0038] In some embodiments, the connector 323 forms a plurality of holes to reduce the weight of the connector 323 itself.

[0039] In some embodiments, see Figure 2 The first moving component 33 may include: a first moving member 331, a second moving member 332, and a third moving member 333; the first moving member 331 extends along the height direction of the in-pile shielding simulation member 1, and simultaneously slides with a first arc-shaped member 321 and a second arc-shaped member 322 to be able to move along the circumferential direction of the first arc-shaped member 321 and the second arc-shaped member 322. The second moving member 332 extends radially along the in-pile shielding simulation member 1, and is slidably disposed on the first moving member 331 to be able to move along the length direction of the first moving member 331; the third moving member 333 is slidably disposed on the second moving member 332 to be able to move along the length direction of the second moving member 332; and a first flow velocity measuring member 31 is disposed on the third moving member 333.

[0040] In such an embodiment, the movement of the first moving member 331 on the first arc-shaped member 321 and the second arc-shaped member 322, and the movement of the second moving member 332 on the first moving member 331, can drive the third moving member 333 to move along the circumferential and height directions of the in-pile shielding simulation member 1 on the radially inner side of the in-pile shielding simulation member 1. Furthermore, by moving the third moving member 333 along the length direction of the second moving member 332, the third moving member 333 can move along the height, radial, and circumferential directions of the in-pile shielding simulation member 1 on the radially inner side of the in-pile shielding simulation member 1. This enables the first flow velocity measuring member 31 to measure the coolant flow velocity in the height, radial, and circumferential directions of the in-pile shielding simulation member 1 on the radially inner side of the in-pile shielding simulation member 1, thereby achieving three-dimensional measurement of the coolant flow velocity on the radially inner side of the in-pile shielding simulation member 1.

[0041] In some embodiments, the minimum moving step size of the first moving member 331 and the second moving member 332 can be 5 mm.

[0042] See Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of the first moving member 331 and the second moving member 332 according to an embodiment of this application; Figure 5 yes Figure 4A partial schematic diagram of the structure is shown. The first moving member 331 may include: two bases 3313, a guide rod 3311, a lead screw 3312, and a sliding seat 3314. The guide rod 3311 is fixedly connected to the two bases 3313, and the lead screw 3312 is rotatably connected to the two bases 3313. The sliding seat 3314 is slidably engaged with the guide rod 3311, and when the lead screw 3312 rotates, the sliding seat 3314 can slide relative to the guide rod 3311. The two bases 3313 are slidably engaged with the first arc-shaped member 321 and the second arc-shaped member 322, respectively, thereby driving the guide rod 3311, the lead screw 3312, and the sliding seat 3314 to move radially inward along the circumferential direction of the in-pile shielding simulation member 1. The second moving member 332 is fixedly connected to the sliding seat 3314, thereby being driven by the sliding seat 3314 to move radially inward along the height direction of the in-pile shielding simulation member 1.

[0043] In such an embodiment, the structural arrangement of the first moving part 331 helps to minimize its impact on the flow of coolant within the in-pile shielding simulation part 1, avoids interference with the measurement results, and thus improves the accuracy of the measurement.

[0044] In some embodiments, the first moving member 331 may include two guide rods 3311 to improve stability.

[0045] In some embodiments, the guide rod 3311 has a cylindrical structure with a length of 5.5-6.5m to meet the measurement requirements within the hot sodium pool in the height direction within a range of 5.5m. Its diameter can be 8-12cm to further reduce interference with the hot pool flow field and improve measurement accuracy.

[0046] In some embodiments, the base 3313 includes a fixing plate 33131, a connecting rod 33132, and two fixed mounting seats 33133. The fixing plate 33131 and the connecting rod 33132 form a T-shaped plate. The two fixed mounting seats 33133 are respectively disposed at both ends of the connecting rod 33132 for mounting the guide rod 3311. The fixing plate 33131 is slidably engaged with the first arc-shaped member 321 or the second arc-shaped member 322, so as to be able to slide along the first arc-shaped member 321 or the second arc-shaped member 322. The lead screw 3312 rotatably mounts the fixing plate 33131. In such an embodiment, the structural design of the base 3313 helps to minimize its influence on the flow of coolant in the in-core shielding simulation component 1, avoids interference with the measurement results, and thus improves the accuracy of the measurement.

[0047] In some embodiments, the radial outer surface of the fixed mounting base 33133 is cylindrical to reduce its impact on the flow of coolant within the in-pile shielding simulator 1.

[0048] In some embodiments, the width of the connecting rod 33132 may be less than half the outer diameter of the fixed mounting base 33133 in order to reduce its impact on the flow of coolant within the in-pile shielding simulator 1.

[0049] In some embodiments, the fixed plate 33131 is provided with a rotating mounting base 331310, and the guide rod 3311 is inserted into the rotating mounting base 331310 and is rotatable relative to the rotating mounting base 331310. The radial outer surface of the rotating mounting base 331310 is cylindrical to reduce its influence on the flow of coolant within the in-core shielding simulator 1.

[0050] In some embodiments, the sliding seat 3314 may include a seat body 33140 and a plurality of sliding mounting members 33141 fixedly connected to the seat body 33140. The seat body 33140 is used to mount the second moving member 332, and the sliding mounting members 33141 are used to slide and engage with the guide rod 3311. The plurality of sliding mounting members 33141 may be respectively disposed on both sides of the seat body 33140 to improve the stability of the sliding engagement with the guide rod 3311.

[0051] In some embodiments, the seat body 33140 may be a vertically extending plate, the sliding mount 33141 may be a ring, and the guide rod 3311 may slidably pass through the ring. In such embodiments, the structure of the sliding seat 3314 can reduce its impact on the flow of coolant within the in-pile shielding simulator 1.

[0052] In some embodiments, the sliding seat 3314 may further include a lead screw mating member 331420 and a lead screw connector 33142 for connecting the lead screw mating member 331420 to the seat body 33140; the lead screw mating member 331420 is threadedly engaged with the lead screw 3312 so that the sliding seat 3314 can be moved up and down by the rotation of the lead screw 3312.

[0053] In some embodiments, the lead screw connector 33142 consists of two L-shaped members arranged opposite each other, and the lead screw mating member 331420 is connected between the two L-shaped members. This arrangement can form a flow channel 3315 for coolant flow between the two L-shaped members, the seat body 33140, and the lead screw mating member 331420, so that the structure of the sliding seat 3314 can reduce its influence on the coolant flow in the in-core shielding simulation member 1.

[0054] In some embodiments, the lead screw mating member 331420 can be a ring, through which the guide rod 3311 slidably passes. In such embodiments, the structure of the sliding seat 3314 can reduce its impact on the flow of coolant within the in-pile shielding simulator 1.

[0055] In some embodiments, the first moving component 33 may further include: a first driving member, a second driving member 334, and a third driving member; the first driving member is used to drive the first moving component 331 to move along the circumferential direction of the first arc-shaped component 321 and the second arc-shaped component 322; the second driving member 334 is used to drive the second moving component 332 to move along the length direction of the first moving component 331; the third driving member is used to drive the third moving component 333 to move along the length direction of the second moving component 332. By setting the first driving member, the second driving member 334, and the third driving member, the first flow rate measuring component 31 can be driven to measure the flow rate of coolant in the height direction, radial direction, and circumferential direction of the in-pile shielding simulation component 1 on the radially inner side of the in-pile shielding simulation component 1, thereby realizing the three-dimensional measurement of the coolant flow rate on the radially inner side of the in-pile shielding simulation component 1.

[0056] In some embodiments, the second drive member 334 may be a motor to drive the lead screw 3312 to rotate.

[0057] In some embodiments, the second flow rate measuring component 4 is disposed at intervals along the circumferential direction of the intermediate heat exchanger simulator 2.

[0058] In such an embodiment, by arranging the second flow rate measuring component 4 at intervals in the circumferential direction of the intermediate heat exchanger simulator 2, it is possible to measure the coolant flow rate in the circumferential direction of the intermediate heat exchanger simulator 2.

[0059] In some embodiments, see Figure 3 and Figure 6 , Figure 6 This is a schematic diagram of the second flow rate measurement components disposed in the intermediate heat exchanger simulator and the reactor vessel simulator. Each second flow rate measurement component 4 may include: a second flow rate measuring element 41, a second connector, and a second moving component 43. The second flow rate measurement component 4 is used to measure the flow rate of the coolant. The second connector is used to connect the second moving component 43 to the intermediate heat exchanger simulator 2 and the reactor vessel simulator 1, or to connect the second moving component 43 to the intermediate heat exchanger simulator 2 and the reactor vessel simulator 6. The second moving component 43 is movably disposed on the second connector and is used to drive the second flow rate measuring element 41 to move radially outward along the height direction and radial direction of the intermediate heat exchanger simulator 2 to measure the flow rate of the coolant in different areas at the inlet of the intermediate heat exchanger simulator 2.

[0060] In this embodiment, since the second moving component 43 can drive the second velocity measuring element 41 to move along the height and radial directions of the intermediate heat exchanger simulator 2, the flow velocity of the coolant in the height and radial directions of the intermediate heat exchanger simulator 2 can be measured. Because the flow channel width on the radially outer side of the intermediate heat exchanger simulator 2 is relatively narrow, the fluid velocity along the radial direction remains essentially constant, and the velocity field has two-dimensional characteristics. Therefore, the measurement in this region only requires adjusting and controlling its position in the two degrees of freedom directions of height and radial direction.

[0061] In some embodiments, for the flow channel region between the intermediate heat exchanger simulator 2 and the in-pile shield simulator 1, two support structures can be pre-welded when installing the second flow velocity measurement component 4. One support structure is welded and fixed to the outer shell of the intermediate heat exchanger simulator 2, and the other support structure is welded and fixed to the outer steel cylinder of the in-pile shield simulator 1 (i.e., the outer steel cylinder of the upper shield simulator 11).

[0062] In some embodiments, for the flow channel region between the intermediate heat exchanger simulator 2 and the stack container simulator 6, two support structures can be pre-installed when installing the second flow velocity measurement component 4. One support structure is welded and fixed to the outer shell of the intermediate heat exchanger simulator 2, and the other support structure is welded and fixed to the stack container simulator 6.

[0063] In some embodiments, see Figure 3 The second moving component 43 may include: a height moving member 431 and a radial moving member 432; the height moving member 431 extends radially along the intermediate heat exchanger simulation member 2, and is slidably disposed on the second connector so as to be movable relative to the second connector along the height direction of the intermediate heat exchanger simulation member 2; the radial moving member 432 is slidably disposed on the height moving member 431 so as to be movable radially along the intermediate heat exchanger simulation member 2; and the second flow rate measuring component 4 is disposed on the radial moving member 432.

[0064] In such an embodiment, the movement of the height-direction moving member 431 can drive the movement of the radial moving member 432, thereby enabling the second flow rate measuring component 4 to measure the flow rate of the coolant in both the height and radial directions of the intermediate heat exchanger simulator 2, thus providing a more comprehensive measurement of the flow field of the intermediate heat exchanger simulator 2.

[0065] In some embodiments, see Figure 3 The second connector includes a connecting body 420, which is provided with a vertical guide rail 4201. A height-direction moving member 431 is slidably mounted on the connecting body 420 via the vertical guide rail 4201. The height-direction moving member 431 is provided with a horizontal guide rail 4311, and a radial moving member 432 is slidably mounted on the height-direction moving member 431 via the horizontal guide rail 4311.

[0066] In some embodiments, the second velocity measuring element 41 is connected to the radial moving element 432 via a vertical rod 44. The vertical rod 44 is configured such that only the vertical rod 44 and the second velocity measuring element 41 are below the hot pool liquid surface, while the second moving element 43 and the second connecting element are both above the hot pool liquid surface. This helps to minimize their impact on the coolant flow within the in-pile shielding simulation element 1, avoids interference with the measurement results, and thus improves the accuracy of the measurement.

[0067] In some embodiments, the vertical rod 44 is a cylindrical structure to further reduce interference with the flow field of the hot pool.

[0068] In some embodiments, see Figure 6 The second connector also includes a mounting member 421 and a connecting rod 422. The mounting member 421 is used to connect the connecting body 420 to the connecting rod 422. The connecting rod 422 is connected to the intermediate heat exchanger simulator 2 and the in-pile shield simulator 1 or to the intermediate heat exchanger simulator 2 and the in-pile container simulator 6, so as to facilitate the installation of the second flow rate measurement assembly 4.

[0069] In some embodiments, both the first velocity measuring element 31 and the second velocity measuring component 4 are ultrasonic Doppler velocimeters. In such embodiments, because the three-dimensional flow field of the hot pool needs to be measured, one-dimensional measurement techniques such as Pitot tubes, propeller velocimeters, and electromagnetic velocimeters are unsuitable; because the test fluid medium of the testing device is water with a temperature range of 20-50°C, hot-wire and hot-film velocimeters are unsuitable; and because the testing device is made of stainless steel and lacks good light transmittance, laser Doppler velocimeters and particle image velocimeters are unsuitable. Using an ultrasonic Doppler velocimeter overcomes these problems, enabling smooth three-dimensional measurement under test temperature and lighting conditions. Furthermore, ultrasonic Doppler velocimeters have minimal interference with the water flow in the measurement area, high measurement accuracy, require no calibration, are easy to operate, and have strong post-processing capabilities for velocity data. Therefore, using an ultrasonic Doppler velocimeter can reduce interference with the flow field of the hot pool, thereby improving measurement accuracy.

[0070] In some embodiments, the ultrasonic Doppler flowmeter can be a FlowTracker2 flowmeter.

[0071] In some embodiments, see Figure 7 , Figure 7This is a schematic diagram of a flow velocity measuring device according to an embodiment of this application; the ultrasonic Doppler flow meter may include an ultrasonic transmitting probe 51 and two ultrasonic receiving probes 52. The two ultrasonic receiving probes 52 are at the same horizontal height as the ultrasonic transmitting probe 51, and the two ultrasonic receiving probes 52 are respectively located on both sides of the ultrasonic transmitting probe 51. The ultrasonic Doppler flow meter can calculate the three-dimensional water flow velocity by collecting the sound wave frequency changes from the ultrasonic receiving probes 52.

[0072] In a specific embodiment, the fixed distance between the area detectable by the ultrasonic Doppler current meter and the ultrasonic transmitting probe 51 is 10 cm. The area detectable by the ultrasonic Doppler current meter can be a horizontally extending cylinder. The cylinder has a diameter of 6 mm and a height of 9 mm.

[0073] Embodiments of this application also provide a testing device for the hydraulic characteristics of the primary loop of a pool-type fast reactor. This testing device may include: a pool-type fast reactor simulator, a drive pump and coolant delivery pipeline, and a hot pool flow field measurement device provided in any embodiment of this application. The pool-type fast reactor simulator is used to simulate the coolant flow channels within a pool-type fast reactor. The drive pump and coolant delivery pipeline are located outside the pool-type fast reactor simulator and are used to circulate coolant into the pool-type fast reactor simulator, so that the coolant flows along the coolant flow channels within the pool-type fast reactor simulator. The hot pool flow field measurement device is configured to measure the coolant flow rate in different regions of the pool-type fast reactor simulator.

[0074] In such an embodiment, by setting up a drive pump and a pool-type fast reactor simulator, a pool-type fast reactor can be simulated. The hot pool flow field measurement device measures the coolant flow rate in different regions of the hot pool of the pool-type fast reactor simulator, thereby providing data support for studying the thermal-hydraulic characteristics of the primary loop of a pool-type sodium-cooled fast reactor.

[0075] In some embodiments, the pool-type fast reactor simulator may include: a reactor vessel simulator 6, a core simulator 7, a hot and cold pool partition simulator, a flow distribution simulator, a pump simulator, an intermediate heat exchanger simulator 2, and an in-core shield simulator 1. The reactor vessel simulator 6 simulates the reactor vessel of an actual pool-type fast reactor. The core simulator 7 is disposed within the reactor vessel simulator 6 and simulates the flow channels of the core of an actual pool-type fast reactor. The hot and cold pool partition simulator is disposed within the reactor vessel simulator 6 and simulates the hot and cold pool partitions of an actual pool-type fast reactor, dividing the region of the reactor vessel simulator 6 located radially outside the core simulator 7 to form a hot pool and a cold pool. The flow distribution simulator simulates the flow channels of the flow distribution components of an actual pool-type fast reactor to distribute coolant to each simulated flow channel. A pump simulator is installed within reactor vessel simulator 6 to simulate the flow path of the main pump in an actual pool-type fast reactor. The pump simulator is configured to receive coolant from the coolant delivery pipeline, deliver the coolant to the flow distribution simulator, and return coolant from the cold pool to the coolant delivery pipeline. An intermediate heat exchanger simulator 2 is installed within reactor vessel simulator 6 to simulate the flow path of the intermediate heat exchanger in an actual pool-type fast reactor.

[0076] In this embodiment, a pump simulator is used to introduce coolant supplied by the drive pump and coolant delivery pipeline into the vessel simulator, providing flow to each channel and allowing coolant from the cold pool to return to the coolant delivery pipeline, thereby simulating the circulating flow of coolant within an actual pool-type fast reactor. By setting up simulators for each component, the flow field within an actual pool-type fast reactor is reproduced as closely as possible, ensuring that the measured data reflects reality as closely as possible and improving the reliability of the test data.

[0077] In some embodiments, the pump simulator forms an inlet and an outlet, which are in fluid communication with the coolant delivery pipeline, respectively. The pump simulator also forms a simulated pump inlet and a simulated pump outlet. The simulated pump inlet allows coolant from the inlet to enter the flow distribution simulator, and the simulated pump outlet allows coolant from the cold pool to enter the outlet. By forming a simulated pump outlet and a simulated pump inlet on the pump simulator, the flow field of the primary loop main pump of an actual fast reactor is simulated, and the circulating flow of coolant is achieved. By adjusting the flow rate of the driving pump, the function of the primary loop main pump of an actual pool-type fast reactor can be simulated.

[0078] In some embodiments, the testing apparatus may further include a heating element disposed outside the pool-type fast reactor simulator for heating the coolant to a preset temperature and driving a pump and coolant delivery pipeline to circulate coolant at the preset temperature into the pool-type fast reactor simulator. In such embodiments, the coolant temperature is regulated by the heating element disposed outside the pool-type fast reactor simulator, simulating the coolant temperature of an actual pool-type fast reactor under different operating conditions. The core simulator only needs to simulate the flow channels of the core of an actual pool-type fast reactor, simplifying the design complexity of the core simulator.

[0079] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0080] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A hot pool flow field measurement device suitable for a pool-type fast reactor primary loop hydraulic characteristic testing device, characterized in that, The measuring device includes: The first flow rate measurement component is disposed on the in-pile shielding simulation component of the test device and is used to measure the coolant flow rate in the region radially inside the in-pile shielding simulation component and located above the core simulation component of the test device. The second flow rate measuring component is disposed in the intermediate heat exchanger simulator of the test device and is used to measure the coolant flow rate at the inlet of the intermediate heat exchanger simulator.

2. The measuring device according to claim 1, characterized in that, The first flow velocity measurement component includes: The first flow rate measuring device is used to measure the flow rate of the coolant; A first connection component is used to connect to the in-pile shielding simulation component; A first moving component, disposed on the first connecting component, is used to drive the first flow rate measuring element to move radially inward on the in-pile shielding simulator to measure the flow rate of coolant in different regions radially inward on the in-pile shielding simulator.

3. The measuring device according to claim 2, characterized in that, The first connection component includes: The first arc-shaped component is disposed on the upper end face of the upper shielding simulation component of the in-pile shielding simulation component; The second arc-shaped component is disposed parallel to the first arc-shaped component on the upper end face of the radial inner shielding simulation component of the stack shielding simulation component; The first moving component is configured to move along the circumferential direction of the first arcuate member and the second arcuate member.

4. The measuring device according to claim 3, characterized in that, The first connection component further includes: Multiple connectors are arranged at intervals for mounting the first arc-shaped component onto the upper end face of the upper shielding simulation component.

5. The measuring device according to claim 3, characterized in that, The first moving component includes: The first moving part extends along the height direction of the in-pile shielding simulation part, and the first moving part slides in conjunction with the first arc-shaped part and the second arc-shaped part so as to be able to move along the circumferential direction of the first arc-shaped part and the second arc-shaped part. The second movable member extends radially along the in-pile shielding simulation member and is slidably disposed on the first movable member so as to be able to move along the length direction of the first movable member; The third moving member is slidably disposed on the second moving member so as to be able to move along the length direction of the second moving member; The first flow velocity measuring element is disposed on the third moving element.

6. The measuring device according to any one of claims 1-5, characterized in that, The second flow rate measuring component is disposed at intervals along the circumferential direction of the intermediate heat exchanger simulator.

7. The measuring device according to any one of claims 1-6, characterized in that, Each of the second flow velocity measurement components includes: The second flow rate measuring device is used to measure the flow rate of the coolant; The second moving component is used to drive the second flow rate measuring component to move along the height direction and radial direction of the intermediate heat exchanger simulator on the radially outer side of the intermediate heat exchanger simulator, so as to measure the flow rate of coolant in different regions at the inlet of the intermediate heat exchanger simulator. The second connector is used to connect the second moving component to the intermediate heat exchanger simulator and the in-pile shield simulator, or to connect the second moving component to the intermediate heat exchanger simulator and the reactor vessel simulator of the test apparatus.

8. The measuring device according to claim 7, characterized in that, The second moving component includes: A height-direction moving member extends radially along the intermediate heat exchanger simulation member, and the height-direction moving member is slidably disposed on the second connector so as to be movable relative to the second connector along the height direction of the intermediate heat exchanger simulation member; A radially moving member is slidably disposed on the height-direction moving member so as to be able to move radially along the intermediate heat exchanger simulation member; The second flow velocity measuring element is disposed on the radial moving element.

9. The measuring device according to claim 2, characterized in that, Both the first and second flow velocity measuring devices are ultrasonic Doppler flow meters.

10. A testing device for the primary loop hydraulic characteristics of a pool-type fast reactor, characterized in that, include: A pool-type fast reactor simulator, used to simulate the coolant flow channels within a pool-type fast reactor; A drive pump, located outside the pool-type fast reactor simulator, is used to deliver coolant into the pool-type fast reactor simulator so that the coolant flows along the coolant channel within the pool-type fast reactor simulator. The hot pool flow field measuring device according to any one of claims 1-9 is configured to measure the flow rate of coolant in different hot pool regions of the pool fast reactor simulator.

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