A method and device for installing a protective casing in an underwater deep channel of a heavy water reactor

Abstract

The present application belongs to the technical field of underwater installation of protective sleeves, and aims to solve the problem of installing protective sleeves in vertical deep channels of nuclear power heavy water reactors under high irradiation, long distance, underwater. The present application discloses a method and device for installing protective sleeves in underwater deep channels of heavy water reactors. The method first determines the compression amount of the spring in the protective sleeve, installs the channel upward extension component and working platform, grabs the protective sleeve with a short-handled grabbing tool, installs the extension tool rod on the short-handled grabbing tool to form a long-handled grabbing tool, sends the long-handled grabbing tool and the protective sleeve to the deep channel, connects the pre-tightening pressure tool and compresses the spring to the set compression amount, cooperates the flange on the protective sleeve with the pipe seat in the deep channel to release the long-handled grabbing tool and detach the protective sleeve; the device includes a working platform, an extension component, a short-handled grabbing tool, an extension tool rod and a tightening pressure tool. The present application can safely and accurately install protective sleeves in vertical deep channels under high irradiation environments.

Description

Technical Field

[0001] The present application belongs to the technical field of underwater installation of protective sleeves, and in particular relates to a method and device for installing a protective sleeve in an underwater deep channel of a heavy water reactor. Background Art

[0002] In existing heavy water reactor vertical deep boreholes, some situations require the installation of a device within the borehole or at the bottom of the deep borehole. Currently, the commonly used methods for installing devices in deep boreholes are direct installation with a straight rod tool and video-based sensor positioning. The direct installation method uses a straight rod tool to directly deliver the pre-installed device to the pre-installation position, then removes the tool. The video-based sensor positioning method uses a video camera and a tow rope to deliver a positioning sensor to the pre-installation position. The pre-installed device is then installed in place based on feedback from the positioning sensor.

[0003] The core of a nuclear heavy-water reactor contains numerous narrow channels, over ten meters deep, running vertically through the reactor's heavy water environment. These channels vary in diameter, with steps of varying diameters at different depths. Installing devices within these channels typically requires the installation of protective sleeves, which shield the devices from external forces or the impact of heavy water flow.

[0004] However, the above two existing methods cannot be used to install device protection sleeves in the deep channel of a heavy water reactor for the following reasons:

[0005] (1) The principle of the video plus sensor positioning method is to first install the sensor and then determine the installation position based on the electromagnetic signal feedback from the sensor. The flow of heavy water moderator in the reactor generates turbulence, which will greatly reduce the precision and accuracy of the sensor; the hole is more than ten meters deep and the peripheral dose rate is as high as 10 6 Gy / h. Existing radiation-resistant cameras cannot enter the core and cannot determine whether the sensor has reached the correct position.

[0006] (2) The protective sleeve is a tubular structure with a threaded bottom and is about six meters long. The threaded structure at the bottom is connected to the internal thread of the positioning seat at the bottom of the core, and the pipe mouth is connected to a positioning platform deep in the channel. The installation of the protective sleeve cannot be completed by relying solely on a towing rope.

[0007] (3) The total height of the protective sleeve and the straight rod tool is greater than the height of the straight rod tool hanging from the nuclear island to the hole mouth, which makes the direct installation method of the straight rod tool impossible to implement.

[0008] It can be seen that conventional installation methods can no longer meet the needs, and it is necessary to invent a new safe and accurate installation method and equipment support to meet the installation of protective casings in vertical deep channels in nuclear power heavy water reactors with high irradiation, long distances, underwater, and in the vertical depth. Summary of the Invention

[0009] The purpose of this application is to provide a method and device for installing a protective sleeve in a deep underwater channel of a heavy water reactor, which solves the problem of installing a protective sleeve in a high-irradiation, long-distance, underwater, and vertical deep channel of a nuclear power heavy water reactor. It has high accuracy, is away from high-irradiation environments to the greatest extent possible, and greatly reduces the radiation dose of operators.

[0010] In order to achieve the above objectives, this application provides the following technical solutions:

[0011] In a first aspect, the present application provides a method for installing a protective casing in an underwater deep channel of a heavy water reactor, comprising:

[0012] S1: Determine the compression of the spring in the protective sleeve;

[0013] S2: Install the extension component of the deep channel upward on the upper surface of the deep channel;

[0014] S3: carrying the benchmark and gripping platform on the working platform;

[0015] S4: Grab the protective sleeve with a short-handled grabbing tool;

[0016] S5: Fix the protective sleeve to the upper port of the extension assembly;

[0017] S6: Install the extended tool rod on the short-handled grabbing tool to use as a long-handled grabbing tool;

[0018] S7: Send the long-handled grabbing tool and the protective sleeve into the deep hole;

[0019] S8: Fix the support tube of the extended tool rod to the upper port of the extension assembly;

[0020] S9: Assemble the preload pressure tool in sections by grabbing the platform;

[0021] S10: compress the spring to a set compression amount by applying a preload pressure tool;

[0022] S11: Fit the flange on the protective sleeve with the pipe socket in the deep hole;

[0023] S12: Release the long-handled grabbing tool and detach it from the protective sleeve, completing the installation of the protective sleeve.

[0024] As an implementable method, in S2, the axis of the extension component is aligned with the axis of the deep channel, and the upper surface of the extension component is perpendicular to the axis of the deep channel, serving as the zero base surface for installation.

[0025] As an implementable method, in S3, two datums and two gripping platforms are mounted on the working platform, the two datum cross sections are parallel to the installation zero foundation surface, and the bushings are installed vertically on the datum cross sections and coincide with the axis of the extension component.

[0026] As an implementable method, in S4, the side positioning pin of the short-handled grabbing tool is inserted into the positioning hole of the protective sleeve to connect the short-handled grabbing tool to the protective sleeve.

[0027] As an implementable method, in S5, the outer ring of the protective sleeve bracket is clamped on the upper port of the extension component, and the inner ring hole clamps the upper flange of the protective sleeve.

[0028] As an implementable method, in S8, the outer ring of the long-handled grabbing tool bracket is clamped on the upper port of the extension component, the inner ring hole clamps the extended tool rod, and the support tube is fixed at the upper port of the extension component.

[0029] As an implementable method, in S9, the assembled preload pressure tool is inserted into the long-handled grabbing tool and the protective sleeve along the shaft sleeve on the datum 1 and datum 2 platforms until the preload pressure tool contacts the spring and the first scale line of the preload pressure tool is aligned with the installation zero foundation surface.

[0030] As an implementable method, in S10, the second engraved line of the preload pressure tool is aligned with the installation zero foundation surface, and the preload pressure tool is fixed by the clamping bolts on both sides of the support tube so that the spring always maintains the compression amount and the threaded rod of the protective sleeve contacts the lower positioning piece in the core.

[0031] As an implementable method, in S11, the long-handled grabbing tool bracket is removed, and the long-handled grabbing tool is screwed to drive the protective sleeve and the threaded rod into the threaded hole of the lower positioning part and cooperate with the threaded hole until the flange on the protective sleeve cooperates with the pipe seat in the deep channel, so that the third scale line of the extended tool rod is aligned with the installation zero foundation surface.

[0032] In a second aspect, the present application provides a device for installing a protective casing in a deep underwater channel of a heavy water reactor, comprising:

[0033] The working platform is equipped with grabbing platform 1, grabbing platform 2, datum 1 and datum 2, and the cross sections of the two datums are parallel to the installation zero foundation surface;

[0034] The extension assembly is mounted on the upper surface of the deep channel, with its axis coinciding with the axis of the deep channel;

[0035] A short-handled grabbing tool is used to grab the protective sleeve. A positioning pin is provided on the side. The total length of the short-handled grabbing tool and the protective sleeve is less than the distance from the inner hoist of the nuclear island to the upper end face of the extension assembly.

[0036] An extended tool rod is mounted on the short-handled grabbing tool to form a long-handled grabbing tool, and a support tube of the long-handled grabbing tool is fixed at an upper end of the extension assembly;

[0037] The preload pressure tool has a first scale line and a second scale line, and is assembled in sections by grabbing platform 1 and grabbing platform 2. The preload pressure tool compresses the spring of the protective sleeve 1 to a set compression amount.

[0038] Compared with the prior art, the method and device for installing a protective casing in an underwater deep channel of a heavy water reactor provided in this application have the following beneficial effects:

[0039] The present application enables the threaded rod at the lower end of the protective sleeve to cooperate with the threaded hole of the lower positioning piece in the core, and the upper port of the protective sleeve to cooperate with the pipe seat in the deep channel, so as to safely and accurately install the protective sleeve of a certain device in a vertical deep channel in the high-irradiation environment of an underwater heavy water reactor.

[0040] Furthermore, this application establishes a system for installing devices at any depth position in vertical deep channels, and comprehensively summarizes the methods for installing protective sleeves in holes of different diameters, which facilitates targeted and specific installation and has guiding significance for the installation of protective sleeves in various deep holes in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings required for the technical description.

[0042] Figure 1 A flow chart of the method for installing a protective casing in a deep underwater channel of a heavy water reactor provided in this application;

[0043] Figure 2 A schematic diagram of the protective sleeve structure provided by the prior art;

[0044] Figure 3 Schematic diagram of a vertical deep hole for a heavy water reactor provided by the prior art;

[0045] Figure 4 for Figure 3 The enlarged view of point Ⅰ in the middle;

[0046] Figure 5 for Figure 3 Enlarged view of the middle II;

[0047] Figure 6 Schematic diagram of the work platform provided for this application;

[0048] Figure 7 Schematic diagram of the working of the short-handled grabbing tool provided for this application;

[0049] Figure 8 A schematic diagram of the protective sleeve support provided for this application;

[0050] Figure 9 Schematic diagram of the working of the long-handled grabbing tool provided for this application;

[0051] Figure 10 Schematic diagram of the protective casing provided in this application entering the deep channel;

[0052] Figure 11 Schematic diagram of the preload pressure tool structure provided for this application;

[0053] Figure 12 Schematic diagram of the protective sleeve installed in place for this application;

[0054] Figure 13 This is a schematic diagram of the structure of the long-handled screwing tool provided in this application.

[0055] Description of reference numerals:

[0056] 1: Protective sleeve; 2: Spring; 3: Extension assembly; 4: Deep hole; 5: Zero foundation surface; 6: Working platform; 7: Datum one; 8: Datum two; 9: Grabbing platform one; 10: Grabbing platform two; 11: Bushing; 12: Short-handled grabbing tool; 13: Protective sleeve bracket; 14: Upper flange; 15: Extension tool rod; 16: Long-handled grabbing tool; 17: Long-handled grabbing tool bracket; 18: Support cylinder; 19: Threaded rod; 20: Lower positioning piece; 21: Preload pressure tool; 22: Clamping bolt; 23: Long-handled screwing tool; 24: Screwing head; 25: Internal nut; 26: Locating pin; 30: Internal pipe socket; 31: Locating hole; 51: First scale line; 52: Second scale line; 53: Third scale line. DETAILED DESCRIPTION

[0057] The following is further explained in detail through specific implementation methods.

[0058] For ease of understanding, we first briefly describe the existing protective casing and the vertical deep hole of the heavy water reactor. Figure 2 As shown, the protective sleeve 1 is mainly composed of a pipe wall, an upper flange 14, a spring 2 and a threaded rod 19. The protective sleeve 1 has a long rod-shaped main structure, with a spring 2 installed at the bottom and a threaded rod 19 extending downward from the bottom; the upper part is provided with an upper flange 14 and a positioning hole 31. Figures 3 to 5 As shown, the deep channel 4 is arranged vertically, with the internal pipe socket 30 positioned at the top of the calandria and the lower retaining member at the bottom. The protective sleeve 1 is pre-installed into the vertical deep channel (deep channel 4) of the heavy water reactor. The upper flange 14 fits into the internal pipe socket 30 of deep channel 4, the threaded rod 19 is screwed into the lower retaining member 20, and the spring 2 is compressed to the specified length L.

[0059] Since the upper surface of the deep channel 4 has different shapes, the inclined or irregular surface cannot be used as the installation reference surface. Therefore, this application needs to establish an upward extension component 3 based on the upper surface of the deep channel 4. Figure 6As shown, its axis coincides with the axis of the deep channel 4, and the upper surface of the extension component 3 is perpendicular to the axis, which serves as the zero base surface 5 for installation.

[0060] like Figure 1 As shown, the present application provides a method for installing a protective casing in a deep underwater channel of a heavy water reactor, comprising:

[0061] Step 1: Determine the compression of spring 2 in protective sleeve 1. Based on the required spring preload N Newton, use a spring dynamometer to measure the compression of spring 2 (L mm).

[0062] Step 2: Install the upward extension assembly 3 on the upper surface of the deep channel 4. The upper surface of the deep channel 4 varies in shape, and inclined or irregularly shaped surfaces cannot serve as a base for installation. Therefore, the upward extension assembly 3 must be installed on the upper surface of the deep channel 4. The axis of the extension assembly 3 coincides with the axis of the deep channel 4, and the upper surface of the extension assembly 3 is perpendicular to the axis of the deep channel, which serves as the zero base surface 5 for installation.

[0063] Step 3: Install the datums and grabbing platforms on the work platform 6. The work platform 6 carries two datums, Datum 1 7 and Datum 2 8, and two grabbing platforms, Grab Platform 1 9 and Grab Platform 2 10. The cross-sections of the two datums are parallel to the zero foundation surface 5, and the vertically mounted bushings 11 on the datum cross-sections coincide with the axis of the extension assembly 3.

[0064] Step 4: Grab the protective sleeve 1 using the short-handled grabbing tool 12. The locating pins 26 on the side of the short-handled grabbing tool 12 extend and enter the locating holes 31 of the protective sleeve 1, connecting the short-handled grabbing tool 12 to the protective sleeve 1. The combined length of the short-handled grabbing tool 12 and the protective sleeve 1 is less than the distance from the nuclear island crane to the upper end face of the extension assembly 3. The crane is then used to lower the short-handled grabbing tool 12 and the protective sleeve 1 into the extension assembly 3.

[0065] Step 5: Fix the protective sleeve 1 to the upper end of the extension assembly 3 through the protective sleeve bracket 13. The outer ring of the protective sleeve bracket 13 is clamped on the upper end of the extension assembly 3, and the inner ring hole of the protective sleeve bracket 13 clamps the upper flange 14 of the protective sleeve 1.

[0066] Step 6: Install the extended tool rod 15 on the short-handled grabbing tool 12 to form a long-handled grabbing tool 16, so that the total length reaches the length required to deliver the protective sleeve 1 to the specified position. The extended tool rod 15 is assembled in sections using the grabbing platform 1 9 and the grabbing platform 2 10 of the working platform 6, so that the total length reaches the length required to deliver the protective sleeve 1 to the specified position.

[0067] Step 7: Remove the protective sleeve bracket 13 and use a crane to deliver the long-handled grabbing tool 16 and the protective sleeve 1 into the deep channel 4.

[0068] Step 8: Secure the support tube 18 at the upper end of the extension tool rod 15 to the upper end of the extension assembly 3 using the long-handled grabbing tool bracket 17. The outer ring of the long-handled grabbing tool bracket 17 clamps onto the upper end of the extension assembly 3, while the inner ring of the long-handled grabbing tool bracket 17 grips the extension tool rod 15. The support tube 18 is secured to the upper end of the extension assembly 3. At this point, the threaded rod 19 at the lower end of the protective sleeve 1 is close to the lower positioning member 20 in the core.

[0069] Step 9: Connect the preload tool 21. Assemble the preload tool 21 in sections using grabbing platform 1 9 and grabbing platform 2 10 of the work platform 6. Insert the assembled preload tool 21 along the bushings 11 on the datum 1 7 and datum 2 8 platforms into the long-handled grabbing tool 16 and protective sleeve 1 until the preload tool 21 contacts the spring 2. At this point, the first score line 51 of the preload tool 21 aligns with the zero base surface 5.

[0070] Step 10: Use the preload pressure tool 21 to compress the spring 2 within the protective sleeve 1 to the set compression amount L. At this point, the second mark 52 of the preload pressure tool 21 is aligned with the installation zero foundation surface 5. Clamping bolts 22 on both sides of the support tube 18 secure the preload pressure tool 21, ensuring that the spring 2 maintains the compression amount L. At this point, the threaded rod 19 of the protective sleeve 1 contacts the lower positioning member 20 within the core.

[0071] Step 11: Remove the long-handled grabbing tool bracket 17 and screw the long-handled grabbing tool 16, driving the protective sleeve 1 and its threaded rod 19 into the threaded hole of the lower positioning member 20. The rod 19 engages with the threaded hole of the lower positioning member 20 until the upper flange 14 of the protective sleeve 1 engages with the deep channel internal pipe seat 30. At this point, the third score line 53 of the extended tool rod 15 is aligned with the installation zero foundation surface 5.

[0072] Step 12: Release the long-handled grasping tool 16 through the long-handled screwing tool 23 to detach it from the protective sleeve 1. Assemble the long-handled screwing tool 23 in sections using the grasping platform 1 9 and the grasping platform 2 10 of the working platform 6. The assembled long-handled screwing tool 23 enters the long-handled grasping tool 16 along the shaft sleeve 11 on the datum 1 7 and datum 2 8 platforms. The screwing head 24 of the long-handled screwing tool 23 enters the inner nut 25 of the long-handled grasping tool 16. Rotate the long-handled screwing tool 23, the inner nut 25 rotates, the positioning pin 26 retracts, and the long-handled grasping tool 16 is detached from the protective sleeve 1. Remove the long-handled screwing tool 23 and the long-handled grasping tool 16, and the installation of the protective sleeve 1 is complete.

[0073] In addition, based on the above method, the present application also provides a device for installing a protective casing in a deep underwater channel of a heavy water reactor, such as Figures 6 to 13As shown, the device includes an extension component 3, a working platform 6, a short-handled grasping tool 12, a long-handled grasping tool 16, a pre-tightening force applying tool 21, and a long-handled screwing tool 23.

[0074] like Figure 6 As shown, the installation work platform 6 includes grabbing platform 1 9 and grabbing platform 2 10. The work platform 6 is used to position, grab, and transport installation tools. The work platform 6 carries two datums: datum 1 7 and datum 2 8; and two grabbing platforms: grabbing platform 1 9 and grabbing platform 2 10. The cross-sections of the two datums are parallel to the installation zero foundation surface 5. The vertically mounted shaft sleeves 11 on the datum cross-sections coincide with the axis of the extension assembly 3.

[0075] like Figure 7 As shown, the short-handled grabbing tool 12 is used to grasp the protective sleeve 1. The locating pin 26 on the side of the short-handled grabbing tool 12 extends and enters the locating hole 31 of the protective sleeve 1, connecting the short-handled grabbing tool 12 to the protective sleeve 1. The combined length of the short-handled grabbing tool 12 and the protective sleeve 1 is less than the distance from the nuclear island crane to the upper end face of the extension assembly 3. The crane is used to lower the two tools into the extension assembly 3. As the crane descends, the protective sleeve 1 gradually enters the deep channel 4.

[0076] like Figure 8 As shown, the protective sleeve support 13 has an outer ring and an inner ring hole. The protective sleeve support 13 is an openable ring structure. The outer ring clamps to the upper end of the extension assembly 3, while the inner ring hole clamps the upper flange 14 of the protective sleeve 1. When removing the protective sleeve support 13, a crane is used to move the long-handled grabbing tool 16 and the protective sleeve 1 into the deep channel 4. The protective sleeve support 13 secures the protective sleeve 1 to the upper end of the extension assembly 3.

[0077] Figure 9 As shown, the extended tool rod 15 is installed on the short handle grabbing tool 12 to form a long handle grabbing tool 16. The extended tool rod 15 is assembled in sections by grabbing platform 1 9 and grabbing platform 2 10 of the working platform 6 to make the total length reach the required length to deliver the protective sleeve 1 to the specified position.

[0078] like Figure 10 As shown, the long-handled grabbing tool holder 17 is an openable ring-shaped structure with an outer ring and an inner ring hole. The outer ring is clamped to the upper end of the extension assembly 3, while the inner ring hole holds the extended tool rod 15. The support tube 18 is fixed to the upper end of the extension assembly 3. At this point, the threaded rod 19 at the lower end of the protective sleeve 1 is close to the lower positioning member 20 in the core. The function of the long-handled grabbing tool holder 17 is to secure the support tube 18 at the upper end of the long-handled grabbing tool 16 to the upper end of the extension assembly 3.

[0079] like Figure 11As shown, the preload pressure tool 21 has a first scale line 51 and a second scale line 52. The preload pressure tool 21 is assembled in sections using the grabbing platform 1 9 and the grabbing platform 2 10 of the working platform 6. The assembled preload pressure tool 21 is inserted into the long-handled grabbing tool 16 and the protective sleeve 1 along the bushings 11 on the datum 1 7 and datum 2 8 platforms until the preload pressure tool 21 contacts the spring 2. At this point, the first scale line 51 of the preload pressure tool 21 is aligned with the installation zero base surface 5.

[0080] The preload-applying tool 21 compresses the spring 2 within the protective sleeve 1 to the set compression amount L. At this point, the second scale mark 52 of the preload-applying tool 21 aligns with the installation zero foundation surface 5. Clamping bolts 22 on both sides of the support tube 18 secure the preload-applying tool 21, ensuring that the spring 2 maintains the compression amount L. At this point, the threaded rod 19 of the protective sleeve 1 contacts the lower positioning member 20 within the core.

[0081] like Figure 12 As shown, remove the long-handled grabbing tool bracket 17 and screw the long-handled grabbing tool 16, driving the protective sleeve 1 and its threaded rod 19 into the threaded hole of the lower positioning member 20 and engaging with it until the upper flange 14 of the protective sleeve 1 engages with the deep channel internal pipe seat 30. At this point, the third score line 53 of the extended tool rod 15 is aligned with the installation zero foundation surface 5.

[0082] like Figure 13 As shown, the long-handled screwing tool 23 has a screwing head 24 , which is hexagonal in shape and enters into an inner nut 25 of the long-handled gripping tool 16 .

[0083] Use the long-handled screwing tool 23 to release the long-handled gripping tool 16, freeing it from the protective sleeve 1. Assemble the long-handled screwing tool 23 in sections using gripping platform 1 9 and gripping platform 2 10 of the work platform 6. The assembled long-handled screwing tool 23 is inserted into the long-handled gripping tool 16 along the shaft sleeve 11 on the datum 1 7 and datum 2 8 platforms. Rotate the long-handled screwing tool 23, rotating the internal nut 25 and retracting the locating pin 26, freeing the long-handled gripping tool 16 from the protective sleeve 1. Remove the long-handled screwing tool 23 and the long-handled gripping tool 16, and the protective sleeve 1 is installed.

[0084] The above description is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A method for installing a protective casing in a deep underwater channel of a heavy water reactor, characterized in that: include: S1: Determine the compression of the spring in the protective sleeve; S2: Install the extension component of the deep channel upward on the upper surface of the deep channel; S3: carrying the benchmark and gripping platform on the working platform; S4: Grab the protective sleeve with a short-handled grabbing tool; S5: Fix the protective sleeve to the upper port of the extension assembly; S6: Install the extended tool rod on the short-handled grabbing tool to use as a long-handled grabbing tool; S7: Send the long-handled grabbing tool and the protective sleeve into the deep hole; S8: Fix the support tube of the extended tool rod to the upper port of the extension assembly; S9: Assemble the preload pressure tool in sections by grabbing the platform; S10: compress the spring to a set compression amount by applying a preload pressure tool; S11: Fit the flange on the protective sleeve with the pipe socket in the deep hole; S12: Release the long-handled grabbing tool and detach it from the protective sleeve, completing the installation of the protective sleeve.

2. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S2, the axis of the extension component is aligned with the axis of the deep channel, and the upper surface of the extension component is perpendicular to the axis of the deep channel, serving as the zero base surface for installation.

3. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 2, characterized in that: In S3, two datums and two gripping platforms are mounted on the working platform. The two datum cross sections are parallel to the installation zero foundation surface. The bushings are installed vertically on the datum cross sections and coincide with the axis of the extension assembly.

4. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S4, the side positioning pin of the short-handled grabbing tool is inserted into the positioning hole of the protective sleeve to connect the short-handled grabbing tool to the protective sleeve.

5. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S5, the outer ring of the protective sleeve bracket is clamped on the upper port of the extension component, and the inner ring hole clamps the upper flange of the protective sleeve.

6. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S8, the outer ring of the long-handled grabbing tool bracket is clamped at the upper port of the extension component, the inner ring hole clamps the extended tool rod, and the support tube is fixed at the upper port of the extension component.

7. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S9, the assembled preload pressure tool is inserted into the long-handled grabbing tool and the protective sleeve along the shaft sleeve on the datum 1 and datum 2 platforms until the preload pressure tool contacts the spring and the first scale line of the preload pressure tool is aligned with the installation zero foundation surface.

8. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S10, the second engraved line of the preload pressure tool is aligned with the installation zero foundation surface, and the preload pressure tool is fixed by the clamping bolts on both sides of the support tube so that the spring always maintains the compression amount and the threaded rod of the protective sleeve contacts the lower positioning piece in the core.

9. The method for installing a protective casing in an underwater deep channel of a heavy water reactor according to claim 1, characterized in that: In S11, remove the long-handled grabbing tool bracket, screw the long-handled grabbing tool, drive the protective sleeve and the threaded rod into the threaded hole of the lower positioning part, and cooperate with the threaded hole until the flange on the protective sleeve cooperates with the pipe seat in the deep hole, so that the third scale line of the extended tool rod is aligned with the installation zero foundation surface.

10. A device for installing a protective casing in a deep underwater channel of a heavy water reactor, characterized in that: include: The working platform is equipped with grabbing platform 1, grabbing platform 2, datum 1 and datum 2, and the cross sections of the two datums are parallel to the installation zero foundation surface; The extension assembly is mounted on the upper surface of the deep channel, with its axis coinciding with the axis of the deep channel; A short-handled grabbing tool is used to grab the protective sleeve. A positioning pin is provided on the side. The total length of the short-handled grabbing tool and the protective sleeve is less than the distance from the inner hoist of the nuclear island to the upper end face of the extension assembly. An extended tool rod is mounted on the short-handled grabbing tool to form a long-handled grabbing tool, and a support tube of the long-handled grabbing tool is fixed at an upper end of the extension assembly; The preload pressure tool has a first scale line and a second scale line, and is assembled in sections by grabbing platform 1 and grabbing platform 2. The preload pressure tool compresses the spring of the protective sleeve 1 to a set compression amount.

Images