Maintenance scene simulator for thermal sleeve of control rod driving mechanism

Abstract

The invention provides a control rod driving mechanism heat insulation sleeve maintenance scene simulator which comprises an operation platform, a pressure vessel top cover part is arranged below the operation platform, and a biological shielding wall is arranged below the pressure vessel top cover part. A thermocouple tube seat, a Hualong No.1 thermocouple tube seat and a control rod driving mechanism tube seat are arranged on the operation platform. According to the invention, the component size characteristics of three heap types of CNP600, CNP1000 and Hualong No.1 are integrated, and the method is suitable for the three heap types; all parts are movably assembled parts and can be adjusted according to needs, and size changes in actual operation are simulated.

Description

Technical Field

[0001] The invention relates to the technical field of scenario simulation for inspecting and repairing defects of thermal insulation sleeves of control rod drive mechanisms of pressurized water reactor units, and in particular to a scenario simulation body for repairing thermal insulation sleeves of control rod drive mechanisms. Background Art

[0002] According to the experience feedback information provided by the International Atomic Energy Agency, the thermal insulation sleeves of the control rod drive mechanism (CRDM) of the M310 and improved reactor types have major safety hazards, which may lead to major nuclear safety operation incidents such as control rod jamming. At present, my country has no technology for the inspection and repair of thermal insulation sleeves of control rod drive mechanisms. If the thermal insulation sleeves of control rod drive mechanisms of my country's nuclear power plants need to be inspected and repaired, China does not have such technology and needs to rely on the special technology of foreign professional nuclear power maintenance companies.

[0003] Since my country's nuclear power industry is in a blank in the inspection and defect repair technology of the thermal sleeve of the control rod drive mechanism of the pressurized water reactor unit, there is no mature technology and application cases. If a nuclear power unit has a thermal sleeve defect, the domestic nuclear power industry cannot independently inspect and repair it due to lack of technical reserves. Therefore, it is necessary to develop various types of equipment for thermal sleeve inspection and repair, and at the same time, according to the requirements of the reactor type, it needs to be applied to CNP600, CNP1000, Hualong One and other M310-like reactor types.

[0004] At present, there is no simulation device that can be used for thermal sleeve inspection and repair equipment testing. In view of this, considering the verification requirements of various reactor types and various thermal sleeve inspection and repair equipment, it is necessary to design a universal control rod drive mechanism thermal sleeve maintenance scenario simulator. Summary of the invention

[0005] The purpose of the present invention is to provide a control rod drive mechanism insulation sleeve maintenance scene simulation body, which solves the problems of debugging and panoramic simulation test of insulation sleeve inspection and repair equipment.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A control rod drive mechanism insulation sleeve maintenance scenario simulation body comprises an operating platform, a pressure vessel top cover portion is arranged below the operating platform, a biological shielding wall is arranged below the pressure vessel top cover portion, and a thermocouple tube socket, a Hualong One thermocouple tube socket, and a control rod drive mechanism tube socket are arranged on the operating platform.

[0008] Furthermore, the biological shielding wall is provided with a doorway.

[0009] Furthermore, the number of the biological shielding walls is 2, which are symmetrically arranged on both sides of the top cover part of the pressure vessel.

[0010] Furthermore, the width of the biological shielding wall is the same as that of the top cover of the pressure vessel, and a small door is opened and installed in one of the biological shielding walls.

[0011] Furthermore, four support seats are respectively arranged at four corners of the top cover part of the pressure vessel.

[0012] Furthermore, the top cover portion of the pressure vessel is symmetrical front to back and left to right.

[0013] Furthermore, the top cover portion of the pressure vessel has a top cover flange, and 5 complete flange bolt holes are arranged on each side.

[0014] Furthermore, a top cover exhaust pipe is provided on the operating platform, and the top cover exhaust pipe is welded and installed with the top cover penetration hole.

[0015] Furthermore, a staircase is connected to the operating platform via fasteners.

[0016] Furthermore, a fence is welded on the operating platform.

[0017] Compared with the prior art, the control rod drive mechanism insulation sleeve maintenance scenario simulation body provided by the present invention has the following beneficial effects:

[0018] The present invention integrates the component size characteristics of three reactor types, namely CNP600, CNP1000 and Hualong One, and is suitable for the three reactor types.

[0019] All parts of the present invention are movable assembly parts, which can be adjusted as needed to simulate the size changes in actual operation.

[0020] The components of the present invention are replaceable and can simulate the repair and replacement of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a control rod drive mechanism insulation sleeve maintenance scenario simulation body provided by the present invention;

[0023] Figure 2 The schematic diagram of the structure of the control rod drive mechanism insulation sleeve maintenance scenario simulation body provided by the present invention, wherein: Figure 2 and Figure 1 The perspective is different;

[0024] Figure 3 A schematic structural diagram of a control rod drive mechanism insulation sleeve maintenance scenario simulation body from a rear view perspective provided by the present invention;

[0025] Figure 4 A schematic diagram of the structure of a control rod drive mechanism insulation sleeve maintenance scenario simulation body from a bottom-up perspective provided by the present invention.

[0026] Description of reference numerals:

[0027] 1. Biological shielding wall; 2. Support seat; 3. Top cover part of pressure vessel; 4. Thermocouple tube socket; 5. Fence; 6. Hualong One thermocouple tube socket; 7. Stairs; 8. Top cover exhaust pipe; 9. Control rod drive mechanism tube socket. DETAILED DESCRIPTION

[0028] The following is further explained in detail through specific implementation methods.

[0029] like Figures 1 to 4 As shown, the present invention provides a control rod drive mechanism insulation sleeve maintenance scenario simulation body, which is a universal scenario simulation body suitable for testing and verifying insulation sleeve maintenance equipment of M310-like reactors such as CNP600, CNP1000, and Hualong One. It includes a biological shielding wall 1, a support seat 2, a pressure vessel top cover part 3, a thermocouple tube seat 4, a fence 5, a Hualong One thermocouple tube seat 6, a staircase 7, a top cover exhaust pipe 8, a control rod drive mechanism tube seat 9, and an operating platform.

[0030] like Figure 3 As shown, the top cover part 3 of the pressure vessel is arranged below the operating platform, and the operating platform and the top cover part 3 of the pressure vessel are fixed by welding through four columns.

[0031] The biological shielding wall 1 is located below the top cover 3 of the pressure vessel, and has a door opening and a small door installed. The door opening is 600 mm wide and 900 mm high. The width of the biological shielding wall 1 is the same as that of the top cover. One of the biological shielding walls has a small door opened and installed to simulate the real situation. The material of the biological shielding wall 1 can be carbon steel, with a hollow interior design to reduce the overall weight, and the surface is painted. The biological shielding wall 1 is equipped with a hanging point and fixed to the ground.

[0032] Four support seats 2 are respectively arranged at the four corners of the top cover (top cover part 3 of the pressure vessel) and matched with the flange holes.

[0033] The top cover part 3 of the pressure vessel is an assembly part, including flanges on both sides and a sphere in the middle. The external dimensions of the top cover part 3 of the pressure vessel meet the original dimension requirements, and the interior is designed as a hollow structure to reduce the material and weight. The top cover part 3 of the pressure vessel is symmetrical in front and back and left and right, with a front and back width of about 1.5 meters, and the left and right dimensions are the outer circle size of the top cover φ4674mm. The top cover part 3 of the pressure vessel is symmetrical along the 0°-180° central axis with a width of about 1.5 meters, and the outer circle size of the top cover is φ4674mm.

[0034] The top cover part 3 of the pressure vessel has a top cover flange, and 5 complete flange bolt holes are designed on both sides. A C-shaped ring groove and a sealing surface are provided below the top cover flange. The opening positions of the through-pieces on the top cover part 3 of the pressure vessel are distributed according to the actual design. A lifting lug is provided above the top cover part 3 of the pressure vessel, and the bearing strength of the lifting lug must meet the lifting weight requirements of the entire simulation body.

[0035] There are 7 rows of CRDM tube socket mounting holes, a total of 39 holes, on the top cover part 3 of the pressure vessel. The top cover part 3 of the pressure vessel is also provided with four thermocouple tube socket mounting holes and two Hualong One thermocouple tube socket mounting holes. The four thermocouple tube socket mounting holes are used to install the thermocouple tube socket 4, which is symmetrically arranged at the four corners. The two Hualong One thermocouple tube socket mounting holes are used to install the Hualong One thermocouple tube socket 6, which are arranged on the left and right sides of the top cover part 3 of the pressure vessel.

[0036] The number of CNP1000 thermocouple sockets is 4, which are arranged in four symmetrically distributed corners corresponding to the thermocouple socket 4. The CNP1000 thermocouple socket is set on the operating platform, and the distance between the upper end face of the CNP1000 thermocouple socket and the lower end face of the top cover flange is 2665.5±1.5mm. The function of the CNP1000 thermocouple socket is to simulate the real layout space on site.

[0037] The fence 5 is arranged on the operating platform to prevent the operator from falling. Preferably, the fence 5 is welded on the operating platform.

[0038] The number of Hualong One thermocouple sockets 6 is 2, which are arranged on the left and right sides of the top cover 3 for installing Hualong One thermocouple sockets 6. This arrangement simulates the real scene of field equipment. Hualong One thermocouple sockets 6 are set on the operating platform.

[0039] The staircase 7 is connected to the operating platform via fasteners, so that the operator can enter the upper operating platform.

[0040] The number of the top cover exhaust pipe 8 is 1. The top cover exhaust pipe 8 is welded and installed with the top cover penetration hole. The material of the top cover exhaust pipe 8 is preferably 304L stainless steel.

[0041] The number of control rod drive mechanism sockets 9 (CRDM sockets) is 39.

[0042] 39 control rod drive mechanism pipe seats 9 are arranged on the operating platform, and the distance between the upper end surface of the control rod drive mechanism pipe seat 9 and the sealing surface of the top cover flange is 2665.5±1.5mm.

[0043] The rigidity and strength of the present invention meet the assembly requirements of the entire assembly, and the entire assembly can be hoisted separately without deformation during hoisting.

[0044] The size characteristics of the invention take into account the pressure vessel cover structures of CNP600, CNP1000 and Hualong One, and bring together the accessories of the three types of reactor covers. The invention can fully simulate the scenes of the storage room of the pressure vessel covers of CNP600, CNP1000 and Hualong One, and can be applied to the inspection and repair of various insulation sleeves of the three types of reactors.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control rod drive mechanism insulation sleeve maintenance scenario simulation body, characterized in that: The invention comprises an operating platform, a pressure vessel top cover part (3) is arranged below the operating platform, a biological shielding wall (1) is arranged below the pressure vessel top cover part (3), and a thermocouple tube seat (4), a Hualong One thermocouple tube seat (6), and a control rod drive mechanism tube seat (9) are arranged on the operating platform.

2. The control rod drive mechanism insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: The biological shielding wall (1) is provided with a door opening.

3. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1 or 2, characterized in that: The number of the biological shielding walls (1) is 2, which are symmetrically arranged on both sides of the top cover part (3) of the pressure vessel.

4. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 3, characterized in that: The width of the biological shielding wall (1) is the same as that of the top cover part (3) of the pressure vessel, and a small door is opened and installed in one of the biological shielding walls (1).

5. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: Four support seats (2) are respectively arranged at four corners of the top cover part (3) of the pressure container.

6. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: The top cover part (3) of the pressure container is symmetrical front to back and left to right.

7. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: The top cover part (3) of the pressure vessel has a top cover flange, and five complete flange bolt holes are arranged on each side.

8. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: The operating platform is provided with a top cover exhaust pipe (8), and the top cover exhaust pipe (8) is welded and installed with the top cover penetration hole.

9. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: A staircase (7) is connected to the operating platform via fasteners.

10. The control rod drive mechanism thermal insulation sleeve maintenance scenario simulation body according to claim 1, characterized in that: A fence (5) is welded on the operating platform.

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