Thermal state experiment device of liquid metal reactor control rod drive wire

Abstract

The invention discloses a thermal state experimental device of a liquid metal reactor control rod drive wire. Comprising a pressure-bearing shell, a hanging basket guide assembly suspended in the upper end of the pressure-bearing shell, a pressing plate cooperatively connected to a top opening of the pressure-bearing shell, a flange cover hermetically connected to the top of the pressure-bearing shell, an upper core plate connected to the bottom of the hanging basket guide assembly and located in the pressure-bearing shell, and an inlet section axially connected with the lower end of the pressure-bearing shell, the lower reactor core plate is matched and connected with the lower end of the pressure-bearing shell and is positioned in the inlet section; the flange cover, the pressing plate, the hanging basket guide assembly, the upper reactor core plate and the lower reactor core plate are respectively provided with a central hole, and the central holes of the flange cover, the pressing plate, the hanging basket guide assembly, the upper reactor core plate and the lower reactor core plate are sequentially and oppositely communicated to form a centering channel. The integrated pressure-bearing shell is matched with the flange cover, the pressing plate, the hanging basket guide assembly, the upper reactor core plate, the lower reactor core plate and the like to form the thermal state experimental device for the liquid metal reactor control rod drive wire, and overall centering is simple and flexible.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear reactor experimental verification, and particularly relates to a hot state experimental device for a control rod drive line of a liquid metal reactor. BACKGROUND

[0002] The control rod drive line of a reactor is an important guarantee for the safe operation of a nuclear power plant. The control rod drive line uses a drive mechanism arranged at the upper part of a pressure vessel to drive a control rod assembly to move up and down in a reactor core, so as to control the rapid change of the reactivity of the reactor core, and to realize the start-up of the reactor, power regulation, normal shutdown and emergency shutdown under accident conditions. The entire drive line system is composed of a drive mechanism, a guide cylinder assembly, a fuel assembly and a control rod assembly. In order to ensure that the performance and design life of the reactor meet the requirements of nuclear safety regulations and design, it is necessary to carry out verification experiments of the control rod drive line. Therefore, it is necessary to design a related experimental device to meet the centering under hot state conditions and reduce the difficulty of centering. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a hot state experimental device for a control rod drive line of a liquid metal reactor.

[0004] The technical scheme adopted by the present application to solve the technical problem is: a hot state experimental device for a control rod drive line of a liquid metal reactor is provided, which comprises an integrated pressure-containing shell, a basket guide assembly suspended inside the upper end of the pressure-containing shell, a pressure plate connected in cooperation at the top opening of the pressure-containing shell, a flange cover sealingly connected at the top of the pressure-containing shell, an upper core plate connected at the bottom of the basket guide assembly and located inside the pressure-containing shell, an inlet section axially connected with the lower end of the pressure-containing shell, and a lower core plate connected in cooperation at the lower end of the pressure-containing shell and located inside the inlet section.

[0005] The flange cover, the pressure plate, the basket guide assembly, the upper core plate and the lower core plate are respectively provided with central holes, and the central holes of the flange cover, the pressure plate, the basket guide assembly, the upper core plate and the lower core plate are sequentially and oppositely communicated to form a centering channel.

[0006] Preferably, a sealing ring is arranged between the flange cover and the top surface of the pressure-containing shell; the sealing ring is formed by wrapping a metal ring around graphite.

[0007] Preferably, the flow channel inside the upper end of the pressure-containing shell is a circular flow channel, and the flow channel inside the lower end of the pressure-containing shell is a hexagonal flow channel.

[0008] Preferably, a flange portion is arranged at the top of the pressure-containing shell, and the flange portion is provided with a locking hole; the locking hole is oppositely communicated with a flange hole on the flange cover, and a first connecting assembly is arranged in the locking hole to lock the flange cover on the pressure-containing shell.

[0009] Preferably, a positioning assembly is further arranged between the flange part and the flange cover, and the positioning assembly is located outside the locking hole and the flange hole.

[0010] The positioning assembly comprises a positioning pin and a positioning hole which are arranged on the flange part and the flange cover respectively.

[0011] Preferably, the basket guiding assembly comprises a basket in a cylindrical shape, and a positioning plate arranged in the middle of the basket in a radial direction; the positioning plate is provided with a through hole which forms a central hole of the basket guiding assembly.

[0012] Preferably, the top of the pressure shell is provided with a first mounting stopper, and the positioning part of the top of the basket is fitted into the first mounting stopper and locked in the first mounting stopper by a fastener.

[0013] The pressing plate is fitted into the top port of the basket and fixed on the basket.

[0014] Preferably, the top surface of the pressing plate and the top end surface of the basket are both lower than the top surface of the pressure shell.

[0015] Preferably, the outer periphery of the lower core plate is provided with a protruding step part which abuts against the lower end surface of the pressure shell and is fixed on the lower end of the pressure shell by a fastener.

[0016] The inlet section is provided with a second mounting stopper towards the top of the pressure shell, and the step part of the lower core plate is accommodated in the second mounting stopper.

[0017] Preferably, the lower end of the pressure shell is provided with a first connecting part which is provided with a first connecting hole; and the inlet section is provided with a second connecting part towards the outer periphery of the top of the pressure shell, and the second connecting part is provided with a second connecting hole.

[0018] The first connecting part and the second connecting part are oppositely fitted, and the first connecting hole and the second connecting hole are oppositely communicated, and the first connecting part and the second connecting part are locked by a second connecting assembly.

[0019] Preferably, the hot state experimental device of the liquid metal reactor control rod drive line further comprises an outlet section which is perpendicular to the pressure shell and connected to the side of the pressure shell; and the internal flow channel of the outlet section is communicated with the interior of the basket guiding assembly.

[0020] The beneficial effects of the present application: by integral pressure shell flange cover, pressing plate, basket guide assembly, upper and lower core plate and so on constitute a set of liquid metal reactor control rod drive line hot state experimental device, the overall centering is simple and flexible. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below with reference to the accompanying drawings and examples, in which:

[0022] Figure 1 is a longitudinal sectional structure schematic diagram of the hot state experimental device of the liquid metal reactor control rod drive line of an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0024] As Figure 1 shown, the hot state experimental device of the liquid metal reactor control rod drive line of an embodiment of the present application, comprising pressure shell 10, inlet section 20, outlet section 30, flange cover 40, pressing plate 50, basket guide assembly 60, upper core plate 70 and lower core plate 80.

[0025] The pressure shell 10 is a cylindrical structure with a certain axial length, and its opposite ends are open. The inlet section 20 is axially connected to the lower end of the pressure shell 10 and communicates with the pressure shell 10. The outlet section 30 is connected to the side of the pressure shell 10, which is opposite to the pressure shell 10 and communicates with the pressure shell 10. The basket guide assembly 60 is suspended inside the upper end of the pressure shell 10, the flange cover 40 is sealingly connected to the top of the pressure shell 10, and the pressing plate 50 is connected to the top opening of the pressure shell 10 and also to the top port of the basket guide assembly 60. The upper core plate 70 is connected to the bottom of the basket guide assembly 60 and located inside the pressure shell 10, and the lower core plate 80 is connected to the lower end of the pressure shell 10 and located inside the inlet section 20.

[0026] Among them, the flange cover 40, the pressing plate 50, the basket guide assembly 60, the upper core plate 70 and the lower core plate 80 are respectively provided with center holes 400, 500, 600, 700 and 800, and the center holes 400, 500, 600, 700 and 800 of the flange cover 40, the pressing plate 50, the basket guide assembly 60, the upper core plate 70 and the lower core plate 80 are in turn opposite to each other and communicate, forming a centering channel.

[0027] The pressure shell 10, the inlet section 20, the outlet section 30, the flange cover 40, the pressing plate 50, the basket guide assembly 60, the upper core plate 70 and the lower core plate 80 are made of corrosion-resistant and high-temperature and high-pressure materials (such as 31608 stainless steel), which can be suitable for metal medium scouring and corrosion.

[0028] Specifically, the pressure shell 10 is an integrated structure with an integrated design, avoiding installation errors of segmented design, effectively ensuring the overall centering degree; and compared with the segmented design, the overall sealing surface of the device is reduced, improving the overall safety and reliability of the device.

[0029] The pressure shell 10 can include a pressure cylinder 11, an upper end joint 12 and a lower end joint 13 connected to opposite ends of the pressure cylinder 11. The pressure cylinder 11 further includes an upper end 111 and a lower end 112 connected to each other, which also form the upper end and the lower end of the pressure shell 10, respectively; the upper basket guide assembly 60 is located in the upper end 111 of the pressure cylinder 11. The upper end joint 12 of the pressure shell 10 serves as an upper support connection structure of the pressure shell 10, and the basket guide assembly 60 is fixedly connected to the upper end joint 12 through the top thereof, so that the basket guide assembly 60 is suspended in the upper end of the pressure shell 10. The lower end joint 13 of the pressure shell 10 serves as a lower support connection structure of the pressure shell 10, and is used to be fixedly connected with the inlet section 20 and the lower core plate 80.

[0030] Generally, the pressure shell 10 has a cylindrical structure in appearance, and the internal flow channel is also generally circular. In the preferred embodiment of the present application for the pressure shell 10, the flow channel inside the upper end 111 of the pressure cylinder 11 is a circular flow channel, i.e. a flow channel with a circular cross section; the flow channel inside the lower end 112 of the pressure cylinder 11 (mainly the flow channel inside the lower end of the pressure cylinder 11) is a hexagonal flow channel, i.e. a flow channel with a hexagonal cross section. The different shapes of the internal flow channel of the above-mentioned pressure shell 10 are suitable for special metal medium reactor and can accurately simulate the flow of the reactor prototype. Combined with the integrated design of the pressure shell 10, the problems of metal medium adhesion and leakage are avoided.

[0031] The inlet section 20 is coaxially arranged with the pressure shell 10 and is sealingly connected to the lower end of the pressure shell 10. Specifically, the lower end (lower end joint 13) of the pressure shell 10 is provided with a first connecting portion 131, and the first connecting portion 131 is provided with a plurality of first connecting holes 130 distributed along the circumference of the first connecting portion 131; the second connecting portion 21 is provided on the outer periphery of the top of the inlet section 20, and the second connecting portion 21 is provided with a plurality of second connecting holes 210 distributed along the circumference of the second connecting portion 21. The first connecting portion 131 and the second connecting portion 21 are relatively matched, the first connecting holes 130 and the second connecting holes 210 are one-to-one connected, and the second connecting assembly is arranged in the connected first connecting holes 130 and second connecting holes 210 to lock the first connecting portion 131 and the second connecting portion 21, i.e. to fix the inlet section 20 to the lower end of the pressure shell 10.

[0032] The second connecting assembly can include a stud, a nut matched with the stud, and a flat washer.

[0033] An annular sealing gasket 22 is provided between the lower end face of the pressure shell 10 and the top surface of the inlet section 20 for sealing; the sealing gasket 22 is located in the inner ring of the first connecting part 131 and the second connecting part 21. The lower end face of the pressure shell 10 and / or the top surface of the inlet section 20 are provided with positioning grooves to accommodate the sealing gasket 22.

[0034] The outlet section 30 can be sealed to the upper end of the pressure shell 10 by welding or other means, specifically connected to the side of the upper end 111 of the pressure cylinder 11. The internal flow channel of the outlet section 30 is connected to the internal flow channel of the upper end 111 and the interior of the basket guide assembly 60.

[0035] The outlet section 30, the pressure shell 10, and the inlet section 20 are connected in sequence to form a medium flow channel. The metallic medium enters the pressure shell 10 from the inlet section 20, flows upward along the medium flow channel into the basket guide assembly 60, and then exits the pressure shell 10 from the outlet section 30.

[0036] At the upper end of the pressure shell 10, a flange cover 40 is sealingly connected to the top of the pressure shell 10, covering the top of the pressure shell 10. The center hole 400 of the flange cover 40 penetrates through the two opposite surfaces of the flange cover 40, communicating with the interior of the pressure shell 10. The flange cover 40 is independent of the pressure shell 10 and can be installed and removed from the pressure shell 10. The independent flange cover 40 can achieve quick switching between centering and misalignment, achieving stepless adjustment of the misalignment amount.

[0037] The pressure shell 10 may have a flange 121 on its top outer periphery, and the flange 121 has a plurality of locking holes 120 arranged at intervals along its axial direction. The pressure shell 10 includes an upper end joint 12, and the flange 121 is disposed on the outer periphery of the upper end joint 12. The locking holes 120 communicate with the flange holes 41 on the flange cover 40, and a first connecting component passes through them to lock the flange cover 40 onto the pressure shell 10.

[0038] The first connecting assembly may include a stud and a nut adapted to the stud.

[0039] A sealing ring 90 is provided between the flange cover 40 and the top surface of the pressure shell 10 to achieve a seal between them. The sealing ring 90 is formed by a metal ring wrapping graphite; a C-ring is preferred. Graphite is soft, has good sealing properties, low activity, and can withstand the erosion and corrosion of special metallic media. It can reduce chemical reactions with special metallic media, ensure absolute parallelism between flange faces, and guarantee the straightness of the experimental apparatus. It also ensures direct contact between flange faces, guaranteeing the dimensional accuracy of the experimental apparatus in the axial direction and increasing the reliability of experimental data. Furthermore, it is beneficial for the experimental apparatus to withstand experimental requirements under high temperature and high pressure environments.

[0040] Optionally, a positioning assembly is also provided between the flange portion 121 of the upper connector 12 and the flange cover 40. The positioning assembly is located outside the locking hole and the flange hole. The positioning assembly includes a matching positioning pin and a positioning hole, one of which is provided on the flange portion 121 and the other on the flange cover 40. During installation, the flange cover 40 is placed on top of the pressure shell 10, and the positioning pin and positioning hole achieve initial positioning of the flange cover 40 on top of the pressure shell 10, while ensuring that the locking hole 120 and the flange hole 41 are aligned one-to-one. Then, the first connecting assembly is installed to lock the flange cover 40 onto the pressure shell 10.

[0041] The pressure plate 50 fits on the top of the pressure shell 10, that is, on the top of the upper connector 12, and is located below the flange cover 40. The center hole 500 on the pressure plate 50 is directly opposite and communicates with the center hole 400 of the flange cover 40. The suspended platform guide assembly 60 is fixedly connected to the upper connector 12 through its top, and the pressure plate 50 is specifically fitted at the top port of the suspended platform guide assembly 60, thus simultaneously covering the suspended platform guide assembly 60 and the upper connector 12.

[0042] Corresponding to the connection between the suspended platform guide assembly 60 and the pressure plate 50, a first mounting stop 14 is provided at the top opening of the pressure shell 10. The first mounting stop 14 is formed by a groove on the top of the upper end connector 12. The top of the suspended platform guide assembly 60 fits into the first mounting stop 14, ensuring that the top of the suspended platform guide assembly 60 and the pressure plate 50 do not protrude from the top surface of the upper end connector 12.

[0043] The suspended platform guide assembly 60 further includes a cylindrical suspended platform 61 and a positioning plate 62 radially disposed in the middle of the suspended platform 61. The positioning plate 62 is provided with a through hole, which forms the central hole 600 of the suspended platform guide assembly 60.

[0044] The top of the suspended platform 61 has a radially outwardly extending positioning part 611. The main body of the suspended platform 61 is inserted into the upper end of the pressure shell 10 along the axial direction. The positioning part 611 of the suspended platform 61 fits into the first mounting stop 14, thus restricting the suspended platform 61 from moving further into the pressure shell 10. The positioning part 611 is locked in the first mounting stop 14 by fasteners such as bolts or internally threaded tapered pins. The pressure plate 50 is positioned at the top port of the suspended platform 61 by a stepped surface fit, and is further fixed to the suspended platform 61 by fasteners such as bolts.

[0045] The device can be centered by horizontally moving the basket guide assembly 60. The pressure plate 50 can be horizontally adjusted in any direction relative to the basket guide assembly 60 to achieve the centering adjustment of the device. The top surface of the pressure plate 50 and the top end face of the basket 61 are both lower than the top surface of the pressure shell 10.

[0046] The upper core plate 70 is fixedly connected to the bottom of the suspended platform 61, forming the base plate of the suspended platform 61. The upper core plate 70 has a central hole 700 connecting the inside and outside of the suspended platform 61. The central hole 700 of the upper core plate 70 is aligned with the central hole 600 on the positioning plate 62, the central hole on the pressure plate 50, and the central hole 400 on the flange cover 40.

[0047] The lower core plate 80 is fixedly connected to the lower end of the pressure shell 10, specifically below the lower end connector 13. The center hole 800 on the lower core plate 80 is aligned with the center hole 700 on the upper core plate 70, the center hole 600 on the positioning plate 62, the center hole on the pressure plate 50, and the center hole 400 on the flange cover 40.

[0048] To connect with the lower end of the pressure shell 10, the outer periphery of the lower core plate 80 is provided with a protruding step 81. The step 81 abuts against the lower end face of the pressure shell 10 and is fixed to the lower end of the pressure shell 10 by fasteners.

[0049] The inlet section 20 is connected to the lower end of the pressure shell 10 and also houses the lower core plate 80. The inlet section 20 has a second mounting stop 23 facing the top of the pressure shell 10. The main body of the lower core plate 80 is housed within the top of the inlet section 20, and the stepped portion 81 of the lower core plate 80 is housed within the second mounting stop 23, so that the top surface of the inlet section 20 can fit against the lower end face of the pressure shell 10 to achieve a seal.

[0050] During the installation of the hot-state experimental apparatus for the control rod drive line of a liquid metal reactor according to an embodiment of the present invention, the lower core plate 80 is first connected to the lower end of the pressure vessel 10, and the pressure vessel 10 is then positioned and installed on the inlet section 20. The upper core plate 70 is fixed to the bottom of the basket guide assembly 60, and the basket guide assembly 60 is installed inside the pressure vessel 10 and fixed. The pressure plate 50 is fixed to the top of the basket guide assembly 60, and the core plate is aligned by adjusting the horizontal position of the basket guide assembly 60 and the pressure plate 50. The flange cover 40 is fixedly sealed to the top of the pressure vessel 10 to achieve alignment adjustment.

[0051] In the hot-state experimental setup of the liquid metal reactor control rod drive line according to an embodiment of the present invention, the control rod drive mechanism of the control rod drive line is fixed above the pressure shell 10 by cooperating with the central hole 400 of the flange cover 40 and the central hole 500 of the pressure plate 50. The guide cylinder assembly is installed inside the pressure shell 10 by cooperating with the central hole 600 of the basket guide assembly 60 and the central hole 700 of the upper core plate 70. The fuel assembly simulator / control rod assembly simulator connected to the guide cylinder assembly is located inside the lower end of the pressure shell 10. The entire control rod drive line can move up and down along the axial direction of the pressure shell 10.

[0052] The high-temperature metallic medium enters the pressure shell 10 from the inlet section 20, flows upward into the basket guide assembly 60, and then exits the pressure shell 10 from the outlet section 30.

[0053] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A hot test apparatus for a liquid metal reactor control rod drive line, characterized by, The pressure shell, the basket guiding assembly, the flange cover, the upper core plate, and the lower core plate are provided with central holes, and the central holes of the flange cover, the pressure plate, the basket guiding assembly, the upper core plate, and the lower core plate are sequentially and oppositely communicated to form a centering channel. The sealing ring is formed by wrapping a metal ring around graphite.

2. The thermal experiment apparatus for a control rod drive line of a liquid metal reactor according to claim 1, characterized by The flow channel in the upper end of the pressure shell is circular, and the flow channel in the lower end of the pressure shell is hexagonal.

3. The thermal experiment apparatus for liquid metal reactor control rod drive line according to claim 1, wherein, The flange portion is provided with a locking hole, and the locking hole is oppositely communicated with a flange hole on the flange cover, and a first connecting assembly is arranged in the locking hole and the flange hole to lock the flange cover on the pressure shell.

4. The thermal experiment apparatus for liquid metal reactor control rod drive line according to claim 1, wherein The positioning assembly is located outside the locking hole and the flange hole.

5. The apparatus of claim 4, wherein, The positioning assembly includes a positioning pin and a positioning hole which are oppositely arranged on the flange portion and the flange cover. The basket guiding assembly includes a basket and a positioning plate which is radially arranged in the middle of the basket.

6. The thermal experiment apparatus for liquid metal reactor control rod drive line of claim 1, wherein, The pressure shell is provided with a first mounting stopper at the top opening, and a positioning portion of the basket is arranged in the first mounting stopper and locked in the first mounting stopper by a fastener.

7. The thermal experiment apparatus for liquid metal reactor control rod drive line of claim 6, wherein, The pressure plate is arranged at the top port of the basket and fixed on the basket. The top surface of the pressure plate and the top end surface of the basket are lower than the top surface of the pressure shell.

8. The thermal experiment apparatus for liquid metal reactor control rod drive line of claim 7, wherein, The lower core plate is provided with a protruding step portion, and the step portion is abutted with the lower end surface of the pressure shell and fixed on the lower end of the pressure shell by a fastener.

9. The thermal experiment apparatus for liquid metal reactor control rod drive line of claim 1, wherein, The inlet section is provided with a second mounting stopper towards the top of the pressure shell, and the step portion of the lower core plate is arranged in the second mounting stopper. The lower end of the pressure shell is provided with a first connecting portion which is provided with a first connecting hole, and the inlet section is provided with a second connecting portion towards the top periphery of the pressure shell, and the second connecting portion is provided with a second connecting hole.

10. The thermal experiment apparatus for liquid metal reactor control rod drive line of claim 1, wherein, The first connecting portion and the second connecting portion are oppositely arranged, the first connecting hole and the second connecting hole are oppositely communicated, and a second connecting assembly is arranged in the first connecting hole and the second connecting hole to lock the first connecting portion and the second connecting portion. The liquid metal reactor control rod drive line thermal state experiment device further includes an outlet section which is perpendicular to the pressure shell and connected to the side of the pressure shell, and the internal flow channel of the outlet section is communicated with the interior of the basket guiding assembly.

11. The hot experiment apparatus of a liquid metal reactor control rod drive line according to any one of claims 1 to 10, characterized in that, ​

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