Positive pressure type radiation shielding putty pouring method and device using self weight

Abstract

The invention provides a positive pressure type radiation shielding putty pouring method and pouring device using self weight, the method and device are used for a nuclear power reactor cabin shielding structure grillwork, and the shielding putty pouring method comprises the steps that at least one pouring hole is formed in the top end face of the nuclear power reactor cabin shielding structure grillwork; at least one vent hole is formed in the top end face of the nuclear reactor cabin shielding structure grillwork; a pouring pipeline is externally connected to the pouring hole; a filling device is connected to the pouring pipeline, and shielding putty is poured into the nuclear power reactor cabin shielding structure grillwork through the filling device; after the nuclear power reactor cabin shielding structure grillwork is filled with shielding putty, the shielding putty with the first height is left in the pouring pipeline; taking down the filling device; and after the shielding putty is dried, the shielding putty extruded out of the pouring pipeline and the vent holes is removed, and the pouring pipeline and the vent holes are filled and leveled up with the shielding putty. The pressure intensity generated by the weight of the shielding putty is utilized to drive the putty to fill the stacking cabin supporting structure grillwork, a cavity above the shielding putty is basically eliminated, and bubbles in the shielding putty are discharged.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation protection, and particularly relates to a positive pressure radiation shielding putty pouring method and a pouring device utilizing dead weight. Background Art

[0002] Nuclear floating platforms and other offshore nuclear power plants will inevitably generate radioactivity during operation and maintenance, and will release penetrating radiation such as neutrons and gamma rays. In order to ensure the radiation safety of personnel and equipment, it is necessary to design a shielding structure for the reactor and the primary circuit system. The shielding structure usually adopts a grid design, and it is necessary to design a reactor compartment shield inside the grid. In some square reactor compartment structure designs, penetrations and instrument pipelines are installed to connect the equipment inside the reactor compartment with the equipment outside. In some grids, the penetrations are large or the instrument pipelines are dense, which will lead to extremely limited construction space and difficulty in installing plate-type shielding materials. Therefore, it is necessary to pour shielding putty into the reactor compartment shielding structure grid. The shielding putty is usually a fluid solid-liquid mixture with high viscosity.

[0003] The external construction surface of the cabin shielding structure grid is very narrow, and the construction area near the pouring hole may also be installed with penetrations or instrument pipelines, which makes construction difficult; the lead and epoxy resin curing agent contained in the shielding putty may cause harm to human health; during the construction of the shielding putty, cavities may be generated above the grid, and bubbles may be generated inside the shielding putty, affecting the shielding effect. Therefore, the pouring process of the shielding putty should be simple and fast, and the generation of cavities and bubbles should be minimized. The pouring device can prevent people from directly contacting the shielding putty.

[0004] Therefore, this application provides a positive pressure radiation shielding putty pouring method and pouring device using deadweight, which can efficiently and smoothly discharge the air in the grid, basically eliminate the cavity above the grid, and more quickly discharge the bubbles generated during the pouring of the shielding putty. This method is convenient for workers to construct, can adapt to the narrow construction space when pouring putty, and ensure that the grid for pouring shielding putty has the shielding performance that meets the design requirements, providing important support for the radioactive safety of personnel outside the cabin. Summary of the invention

[0005] The embodiment of the present invention provides a positive pressure radiation shielding putty casting method using dead weight.

[0006] An embodiment of the present invention provides a casting device.

[0007] In view of this, the first aspect of the present invention proposes a positive pressure radiation shielding putty pouring method using deadweight, which is used for the shielding structure grid of a nuclear power reactor compartment. The shielding putty pouring method includes: opening at least one pouring hole on the top end surface of the shielding structure grid of the nuclear power reactor compartment; opening at least one ventilation hole on the top end surface of the shielding structure grid of the nuclear power reactor compartment; connecting a pouring pipe to the pouring hole; connecting a filling device to the pouring pipe, and pouring shielding putty for the shielding structure grid of the nuclear power reactor compartment through the filling device; after the shielding putty is filled in the shielding structure grid of the nuclear power reactor compartment, leaving a first height of shielding putty in the pouring pipe; removing the filling device; waiting for the shielding putty to dry, removing the shielding putty squeezed out of the pouring pipe and the ventilation hole, and filling it with shielding putty again.

[0008] Further, when the number of the pouring hole is one, the pouring hole is arranged at the center of the top end surface of the nuclear power reactor compartment shielding structure grid.

[0009] Further, when the number of the pouring hole is one, the number of the vent holes is four, and the four vent holes are evenly distributed around the pouring hole.

[0010] Further, when the number of the pouring holes is two, the two pouring holes are symmetrically arranged on the top end surface of the nuclear power reactor compartment shielding structure grid.

[0011] Further, when the number of the pouring holes is two, the number of the vent holes is six, and the six vent holes are evenly distributed around the pouring holes.

[0012] Furthermore, the first height is greater than or equal to 100 mm and less than or equal to 200 mm.

[0013] Further, the diameter of the vent hole is smaller than the diameter of the pouring hole.

[0014] Furthermore, the vent holes are arranged at the edge of the top end surface of the nuclear power compartment shielding structure grid.

[0015] According to a second aspect of the present invention, a casting device is provided for implementing the positive pressure radiation shielding putty casting method using deadweight in the first aspect or any possible implementation of the first aspect, the casting device comprising: a casting pipe, the casting pipe is connected to a filling device, a bayonet is provided below the casting pipe for fixing with the top of the grid. A filling device, the filling device comprising a filling pipe and a filling rod, the filling pipe is provided with a filling port and a filling rod inlet; the filling rod is inserted into the filling pipe from the filling rod inlet, and is used to push the shielding putty entering the filling pipe from the filling port to the casting pipe. A connecting section, the connecting section is a curved pipe, connecting the casting pipe and the filling pipe.

[0016] The beneficial effects brought about by the present invention are as follows: The present invention innovatively proposes a positive pressure radiation shielding putty pouring method using deadweight, and provides a shielding putty pouring device based on the pouring method. The method and device utilize the weight of the shielding putty itself to drive the putty to fill the cabin support structure grid, which is conducive to the efficient and smooth discharge of the air inside the shielding putty, basically eliminating the cavity above the shielding putty, and more quickly discharging the bubbles inside the shielding putty. The construction tool used in the construction process is the shielding putty pouring device, which has a simple structure, low cost, and requires a small construction space for construction, and can adapt to complex construction environments. Workers do not come into direct contact with the shielding putty during the construction process. This method can ensure the construction effect of the shielding putty, provide protection for the shielding performance of the shielding putty, and provide support for protecting the health and safety of construction personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of a method for pouring a positive pressure radiation shielding putty using deadweight provided in an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a square nuclear power reactor compartment with multiple through holes is provided for an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of cavities and bubbles that are easily generated during the construction of shielding putty is provided for an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of typical opening positions of pouring holes and vent holes is provided for an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of casting shielding putty is provided for an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of a casting device is provided for an embodiment of the present invention.

[0023] in, Figures 2 to 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0024] 1 shielding putty, 2 grid, 3 cavity, 4 bubble, 5 pouring hole, 6 vent hole, 7 packing device, 71 packing pipe, 72 packing rod, 73 packing port, 74 packing rod inlet, 8 pouring pipe, 9 connecting section. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention proposes a positive pressure radiation shielding putty casting method using deadweight, which is used for the shielding structure grid of nuclear power reactor compartment, such as Figure 1 As shown, the shielding putty pouring method includes:

[0027] S101: opening at least one casting hole on the top end surface of the nuclear power reactor compartment shielding structure grid;

[0028] S102: at least one vent hole is provided on the top end surface of the nuclear power reactor compartment shielding structure grid;

[0029] S103: Connecting a pouring pipe to the pouring hole;

[0030] S104: connecting the filling device to the pouring pipe, and pouring shielding putty for the grid of the nuclear power reactor compartment shielding structure through the filling device;

[0031] S105: After the shielding putty is filled in the shielding structure grid of the nuclear power reactor compartment, a first height of the shielding putty is left in the pouring pipe;

[0032] S106: Remove the filling device, wait for the shielding putty to dry, remove the shielding putty squeezed out of the pouring pipe and the vent hole, and fill them with shielding putty again.

[0033] In this embodiment, if Figure 2 and Figure 3 As shown, a pouring hole 5 is designed at the center of the top steel plate of the cabin support structure grid 2, and the pouring hole 5 is externally connected to a pouring pipe 8, and the shielding putty 1 is injected into the grid 2 from the pouring pipe 8 through a filling device 7. Figure 3As shown, vent holes 6 are arranged around the edges of the top steel plate of the stack support structure grid 2. The vent holes 6 are used to discharge the air inside the grid 2 when pouring the shielding putty 1. After the shielding putty 1 is filled, the vent holes 6 are used to discharge a small amount of bubbles 4 generated during the pouring of the shielding putty 1. After the shielding putty 1 fills the grid 2, part of the shielding putty 1 should remain in the pouring pipe 8. The pressure formed by the weight of the shielding putty 1 can drive the shielding putty 1 to fill the stack support structure grid 2, efficiently and smoothly discharge the air in the grid 2, and basically eliminate the cavity 3 above the grid 2. The pressure formed by the weight of the shielding putty 1 can drive a small amount of bubbles 4 generated during the pouring of the shielding putty 1 to be discharged from the stack support structure grid 2 through the vent holes 6. The pouring pipe 8 is externally connected to a filling device 7, in which a filling pipe 71 in the filling device 7 is rigidly connected to the pouring pipe 8, and the shielding putty 1 is poured into the filling pipe 71 from the filling port 73, and the filling rod 72 pushes the shielding putty 1 from the filling pipe 71 into the pouring pipe 8. The weight of the shielding putty 1 is used to drive the putty to fill the stack support structure grid 2, which is conducive to efficiently and smoothly discharging the air inside the shielding putty 1, basically eliminating the cavity 3 above the shielding putty 1, and discharging the bubbles 4 inside the shielding putty 1. The construction tool used in the construction process, namely the filling device 7, has a simple structure, low cost, requires a small construction space, and can adapt to complex construction environments. During the construction process, workers do not come into direct contact with the shielding putty 1.

[0034] Further, when the number of the pouring hole 5 is one, the pouring hole 5 is arranged at the center of the top end surface of the nuclear power compartment shielding structure grid 2 .

[0035] Further, when the number of the pouring hole 5 is one, the number of the vent holes 6 is four, and the four vent holes 6 are evenly distributed around the pouring hole 5 .

[0036] Further, when the number of the pouring holes 5 is two, the two pouring holes 5 are symmetrically arranged on the top end surface of the nuclear power compartment shielding structure grid 2 .

[0037] Further, when the number of the pouring holes 5 is two, the number of the vent holes 6 is six, and the six vent holes 6 are evenly distributed around the pouring holes 5 .

[0038] Furthermore, the first height is greater than or equal to 100 mm and less than or equal to 200 mm.

[0039] Furthermore, the diameter of the vent hole 6 is smaller than the diameter of the pouring hole 5 .

[0040] Furthermore, the vent holes 6 are arranged at the edge of the top end surface of the nuclear power compartment shielding structure grid 2 .

[0041] Furthermore, during the construction process, pouring holes 5 and vent holes 6 should be opened on the stack support structure grid 2. The opening positions and sizes of the pouring holes 5 and vent holes 6 should be determined according to the stack support structure grid 2 for pouring the shielding putty 1. The pouring hole 5 should be opened at the center, with an opening diameter of about 100mm-200mm, and the vent holes 6 should be opened around the periphery, with a diameter of about 6mm-15mm. Typical openings are as follows: Figure 4 and Figure 5 As shown, the pouring pipe 8 is inserted into the pouring hole 5, and the pouring method is as follows:

[0042] 1. The shielding putty 1 is injected into the grid 2 through the pouring pipe 8. According to the size of the grid 2 of the stack support structure, part of the shielding putty 1 should be left in the pouring pipe 8 during the pouring process, and the top of the putty should be 100mm to 200mm away from the upper steel plate. The shielding putty 1 in the pouring pipe 8 exerts downward pressure by its own gravity, driving the shielding putty 1 to flow and discharge the internal air.

[0043] 2. After pouring is completed, the filling pipe 71 is removed, and the pouring pipe 8 is left in the stack support structure grid 2, and the shielding putty 1 is dried.

[0044] 3. After the shielding putty 1 is completely dry, remove the pouring pipe 8 and the shielding putty 1 squeezed out from the vent hole, and fill it with shielding putty 1.

[0045] You can use Figure 6 The filling device 7 shown is connected to the pouring pipe 8 for pouring. Before construction, the filling pipe 71 is connected to the pouring pipe 8, and the filling pipe 71 is fixed to the cabin support structure grid 2. During the construction process, the shielding putty 1 is first poured into the filling port 73, and then the filling rod 72 is used to plug the pouring pipe 8 from the filling rod inlet 74, and the shielding putty 1 is gradually pushed into the pouring pipe 8. After the pouring is completed, the filling device 7 is removed, and the pouring pipe 8 is left above the pouring hole 5.

[0046] According to a second aspect of the present invention, a casting device is provided, including a filling device 7 and a casting pipe 8, for implementing the positive pressure radiation shielding putty casting method using deadweight in the first aspect or any possible implementation of the first aspect, such as Figure 6 As shown, the pouring pipe 8 is connected to the filling pipe 71, and a bayonet is provided below the pouring pipe 8 for fixing with the top of the grid; the filling device 7 comprises: a filling pipe 71, on which a filling port 73 and a filling rod inlet 74 are provided; a filling rod 72 is inserted into the filling pipe 71 from the filling rod inlet 74, and is used to push the shielding putty 1 entering the filling pipe from the filling port 73 to the pouring pipe 8. A connecting section 9 connects the pouring pipe 8 and the filling pipe 71, and the connecting section 9 is a curved pipe. Filling pipe 71

[0047] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A positive pressure radiation shielding putty pouring method using deadweight, characterized in that: For use in a nuclear power reactor compartment shielding structure grid, the shielding putty casting method comprises: At least one pouring hole is provided on the top end surface of the nuclear power reactor compartment shielding structure grid; At least one vent hole is provided on the top end surface of the nuclear power reactor compartment shielding structure grid; A pouring pipe is externally connected to the pouring hole; Connecting a filling device to a pouring pipe, and pouring shielding putty for the grid of the nuclear power reactor compartment shielding structure through the filling device; After the shielding putty is filled in the nuclear power reactor compartment shielding structure grid, a first height of the shielding putty is left in the pouring pipe; removing the packing device; After the shielding putty is dried, the shielding putty squeezed out of the pouring pipe and the vent hole is removed, and then filled with the shielding putty again.

2. The method for pouring positive pressure radiation shielding putty using deadweight according to claim 1, characterized in that: When the number of the pouring hole is one, the pouring hole is arranged at the center of the top end surface of the nuclear power compartment shielding structure grid.

3. The method for pouring positive pressure radiation shielding putty using deadweight according to claim 2, characterized in that: When the number of the pouring hole is one, the number of the vent holes is four, and the four vent holes are evenly distributed around the pouring hole.

4. The method for pouring positive pressure radiation shielding putty using deadweight according to claim 1, characterized in that: When the number of the pouring holes is two, the two pouring holes are symmetrically arranged on the top end surface of the nuclear power compartment shielding structure grid.

5. The method for pouring positive pressure radiation shielding putty using deadweight according to claim 4, characterized in that: When the number of the pouring holes is two, the number of the vent holes is six, and the six vent holes are evenly distributed around the pouring hole.

6. The method for pouring positive pressure radiation shielding putty using deadweight according to any one of claims 1 to 5, characterized in that: The first height is greater than or equal to 100 mm and less than or equal to 200 mm.

7. The positive pressure radiation shielding putty pouring method using deadweight according to any one of claims 1 to 5, characterized in that: The diameter of the vent hole is smaller than the diameter of the pouring hole; and\or The vent holes are arranged at the edges of the top end surfaces of the nuclear power compartment shielding structure grids.

8. The positive pressure radiation shielding putty pouring method using deadweight according to any one of claims 1 to 5, characterized in that: The shielding putty includes epoxy resin and lead.

9. A casting device, characterized in that: For the positive pressure radiation shielding putty pouring method using deadweight as claimed in any one of claims 1 to 8, the pouring device comprises: A pouring pipe, the pouring pipe is connected to the filler pipe, and a bayonet is provided below the pouring pipe for fixing with the top of the grid; A packing device, the packing device comprising a packing pipe and a packing rod; A packing pipe, wherein the packing pipe is provided with a packing port and a packing rod inlet; A packing rod, inserted into the packing pipe from the packing rod inlet, and used to push the shielding putty entering the packing pipe from the packing port to the pouring pipe; The connecting section is a curved pipe, connecting the pouring pipe and the filling pipe.

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