Nuclear power station equipment part decontamination method and device

Abstract

The invention discloses a decontamination method and device for equipment parts of a nuclear power station. The decontamination method comprises the steps that a cleaning cavity containing liquid is arranged; a supporting position for loading equipment parts is arranged in the cavity; and the equipment parts on the supporting positions are cleaned by heating the liquid in the cleaning cavity. By means of the method, contact between workers and equipment parts can be reduced, and therefore the exposure dose of the workers is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of decontamination devices, and in particular to a decontamination method and device for nuclear power plant equipment components. Background Art

[0002] After more than 50 years of development, China's nuclear industry has built a large number of nuclear facilities. Considering the protection of personal safety and the extension of equipment life, it is necessary to carry out nuclear facility decontamination. Among the many decontamination methods, chemical decontamination is widely used to remove reflective pollutants on pipelines, equipment components and facility surfaces.

[0003] Large pump equipment in nuclear power plants generally needs to be transported to the thermal overhaul workshop inside the power plant for chemical decontamination. Since chemical decontamination has high requirements for process parameters, such as reagent temperature and concentration, large cleaning tanks and cleaning boxes are installed in the thermal overhaul workshop.

[0004] For smaller equipment, in order to improve the efficiency of decontamination and the lack of conditions for chemical decontamination on site, a more extensive wiping method is generally used for decontamination on site. However, the decontamination effect of this method is limited, and if the dose is too high, it will increase the exposure dose to personnel. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a method for decontaminating components of nuclear power plant equipment.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for decontaminating nuclear power plant equipment components comprises: providing a cleaning chamber containing liquid; providing a support position for loading equipment components inside the chamber; and cleaning the equipment components on the support position by heating the liquid inside the cleaning chamber.

[0008] As a preferred solution of the method for decontaminating components of nuclear power plant equipment of the present invention, the cleaning chamber has a heat preservation function to reduce heat loss of the liquid.

[0009] As a preferred solution of the method for decontaminating nuclear power plant equipment components of the present invention, the support position is used to suspend the equipment components in the liquid.

[0010] The present invention also proposes a method for decontaminating nuclear power plant equipment components, which adopts the above-mentioned method for decontaminating nuclear power plant equipment components; it includes a loading mechanism, which has an inner cavity for loading liquid; a supporting mechanism, which is arranged inside the inner cavity and is used to place equipment components; and a heating mechanism, which is arranged in the inner cavity and is used to heat the liquid inside the inner cavity.

[0011] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, the loading mechanism is provided with a heat-insulating layer wrapping the inner cavity for reducing heat loss.

[0012] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, a sewage outlet is provided on the loading mechanism, and the sewage outlet is communicated with the inner cavity.

[0013] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, the supporting mechanism is fixed to the top of the loading mechanism, and there is a gap between the supporting mechanism and the bottom of the inner cavity.

[0014] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, the supporting mechanism includes a fixed beam connected to the loading mechanism, and a mesh frame connected to the fixed beam; the equipment components are placed inside the mesh frame during cleaning.

[0015] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, wherein: a partition plate is arranged inside the inner cavity, and the partition plate divides the inner cavity into a plurality of independent spaces;

[0016] A heating mechanism is provided inside each independent space.

[0017] As a preferred solution of the nuclear power plant equipment component decontamination device of the present invention, the heating mechanism includes a power supply structure and a heating structure arranged inside the inner cavity.

[0018] The beneficial effects of the present invention are as follows: the method can reduce the contact between the workers and the equipment components, thereby reducing the radiation dose of the workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work. Among them:

[0020] Figure 1 It is a schematic diagram of the overall structure of the nuclear power plant equipment component decontamination device of the present invention.

[0021] Figure 2 The figure is a schematic diagram of the subdivided structure of the decontamination device for nuclear power plant equipment components of the present invention. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Embodiment 1 provides a method for decontaminating a nuclear power plant equipment component, comprising:

[0027] A cleaning chamber containing a liquid is provided;

[0028] The liquid in the cleaning chamber is a cleaning solution, which is mainly a mixture of water and chemicals.

[0029] A support position for loading equipment components is provided inside the chamber;

[0030] The support position is used to suspend the equipment components in the liquid. The equipment components are placed on the support position so that each position of the equipment components can contact the liquid.

[0031] The equipment parts on the support position are cleaned by heating the liquid inside the cleaning chamber.

[0032] The cleaning chamber has a heat preservation function to reduce the heat loss of the liquid, and the cleaning effect of the equipment parts is achieved by heating the liquid.

[0033] Example 2, reference Figure 1 and Figure 2 This embodiment is different from the first embodiment in that: this embodiment also proposes a nuclear power plant equipment component decontamination device, a loading mechanism 100, which has an inner cavity 101 for loading liquid; a supporting mechanism 200, which is arranged inside the inner cavity 101 and is used to place equipment components; a heating mechanism 300, which is arranged in the inner cavity 101 and is used to heat the liquid inside the inner cavity 101.

[0034] During cleaning, the equipment components are placed on the support mechanism 200, and the liquid inside the inner cavity 101 is heated by the heating mechanism 300, thereby achieving a cleaning effect on the equipment components.

[0035] Specifically, the loading mechanism 100 is provided with a heat-insulating layer 102 that wraps the inner cavity 101 and is used to reduce heat loss, wherein the heat-insulating layer 102 is a silicon oxide nano-aerosol material plate material, which is used to reduce heat loss.

[0036] The loading mechanism 100 is provided with a drain port 103 , which is in communication with the inner cavity 101 , and the waste liquid after cleaning can be discharged from the drain port 103 .

[0037] The support mechanism 200 is fixed to the top of the loading mechanism 100, and there is a gap between the support mechanism 200 and the bottom of the inner cavity 101. The support mechanism 200 includes a fixed beam connected to the loading mechanism 100, and a screen frame 202 connected to the fixed beam; the equipment parts are placed inside the screen frame 202 when cleaning.

[0038] Because of the mesh setting of the mesh frame 202, when the equipment components are placed inside the mesh frame 202, the cleaning inside the inner cavity 101 can also enter the interior of the mesh frame 202, contact the equipment components, and clean the equipment components. The support mechanism 200 can allow the equipment components to completely enter the water without contacting the bottom surface of the inner cavity 101, avoiding the problem that the parts of the equipment components that contact the bottom surface of the inner cavity 101 cannot be cleaned.

[0039] The heating mechanism 300 includes a power supply structure 301 and a heating structure 302 arranged inside the inner cavity 101, wherein the power supply structure 301 is a power source, which can be a battery that can be replaced or charged, and the power supply structure 301 provides power to the heating structure 302.

[0040] Moreover, an openable cover 104 is provided on the top of the loading mechanism 100, and the cover 104 can be installed on the loading mechanism 100 through a hinge, so as to facilitate the equipment parts that need to be cleaned to enter the interior of the screen frame 202 from the top. At the same time, a roller structure 105 is also provided at the bottom of the loading mechanism 100 to facilitate the movement of the entire device.

[0041] At the same time, a control structure connected to the heating structure 302 is provided on the device, and an operating panel 400 of the control structure is installed on the outside of the loading mechanism 100. The heating structure 302 can be controlled by the operating panel 400. The control structure also includes a thermometer, which can monitor liquid problems inside the inner cavity 101 and transmit them to the control structure, so that they are displayed on the operating panel 400.

[0042] The cleaning temperature can be set by the control structure, and the liquid inside the inner cavity 101 can be kept at the cleaning temperature by turning on and off the heating structure 302.

[0043] This method can reduce the contact between workers and equipment components, thereby reducing the radiation dose to workers.

[0044] The rest of the structure is the same as that of Example 1.

[0045] Example 3

[0046] Reference Figure 1 and Figure 2 This embodiment is different from the above embodiments in that: a partition plate 500 is provided inside the inner cavity 101, and the partition plate 500 divides the inner cavity 101 into a plurality of independent spaces; and a heating mechanism 300 is provided inside each independent space.

[0047] The purpose of dividing the interior of the inner cavity 101 by the partition plate 500 is to obtain multiple independent spaces to achieve different functions. For example, in this embodiment, the inner cavity 101 is divided into two independent spaces by the partition plate 500, and the two independent spaces are space A and space B.

[0048] A 1.5% HNO3+1.5% KMnO4 decontamination solution is prepared in advance and added to the space A of the cart, and a 1.5% citric acid+0.5% EDTA (pH=2) mixed cleaning solution is prepared and added to the space B, and the equipment is started to heat up, and the cover plate 104 is closed after the temperature reaches 85°C;

[0049] After the device is moved to the site via the roller structure 105, the temperature required for decontamination is set on the operation panel 400 to maintain the temperature of the cleaning liquid, the cover 104 is opened, the device parts to be decontaminated are placed in the screen frame 202 in the space B and the cover 104 is closed to soak for 4 hours.

[0050] The equipment components are then transferred to space A and soaked for 4 hours, and cleaned alternately until they are clean. In this embodiment, the cover plate 104 is directly placed on the top of the loading mechanism 100, and an opening is opened at the top of each independent space, and the screen frame 202 is directly fixed to the cover plate 104 through a fixed beam. Therefore, when the equipment components need to be swapped between space A and space B, the cover plate 104 can be directly taken out through the screen frame 202 for replacement. Therefore, only the cover plate 104 needs to be replaced, and there is no need to touch the equipment components.

[0051] After the decontamination starts, observe whether the equipment parts are clean after each alternating cleaning. When the surface of the parts is free of dirt and rust and has a metallic luster, the decontamination has ended.

[0052] After decontamination is completed, the components are removed, the pH of the decontamination liquid is adjusted to neutral, the waste liquid is discharged, the inner wall of the equipment is rinsed with clean water, and the waste liquid is discharged into the wastewater recovery device of the nuclear power plant for recovery.

[0053] The rest of the structure is the same as that of Example 2.

[0054] It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should readily appreciate that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc., mounting arrangements, use of materials, color, changes in orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be changed or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structures described herein that perform the function, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for decontaminating components of a nuclear power plant, characterized in that: include, A cleaning chamber containing a liquid is provided; A support position for loading equipment components is provided inside the chamber; The equipment parts on the support position are cleaned by heating the liquid inside the cleaning chamber.

2. The method for decontaminating a nuclear power plant equipment component according to claim 1, characterized in that: The cleaning chamber has a heat preservation function to reduce the heat loss of the liquid.

3. The method for decontaminating components of a nuclear power plant as claimed in claim 1, characterized in that: The support is used to suspend the device components in the liquid.

4. A decontamination device for nuclear power plant equipment components, characterized in that: A method for decontaminating components of nuclear power plant equipment according to claims 1 to 3; include, A loading mechanism (100) having an inner cavity (101) for loading liquid; A support mechanism (200), which is disposed inside the inner cavity (101) and is used to place equipment components; A heating mechanism (300) is disposed in the inner cavity (101) and is used to heat the liquid in the inner cavity (101).

5. The decontamination device for nuclear power plant equipment parts according to claim 4, characterized in that: The loading mechanism (100) is provided with a heat-insulating layer (102) that wraps the inner cavity (101) and is used to reduce heat loss.

6. The decontamination device for nuclear power plant equipment parts according to claim 5, characterized in that: The loading mechanism (100) is provided with a sewage discharge port (103), and the sewage discharge port (103) is communicated with the inner cavity (101).

7. The decontamination device for nuclear power plant equipment parts according to claim 4, 5 or 6, characterized in that: The support mechanism (200) is fixed to the top of the loading mechanism (100), and there is a gap between the support mechanism (200) and the bottom of the inner cavity (101).

8. The decontamination device for nuclear power plant equipment parts according to claim 7, characterized in that: The supporting mechanism (200) comprises a fixed beam (201) connected to the loading mechanism (100), and a screen frame (202) connected to the fixed beam (201); The equipment components are placed inside the screen frame (202) during cleaning.

9. The decontamination device for nuclear power plant equipment parts according to claim 8, characterized in that: A partition plate (500) is provided inside the inner cavity (101), and the partition plate (500) divides the inner cavity (101) into a plurality of independent spaces; A heating mechanism (300) is arranged inside each of the independent spaces.

10. The decontamination device for nuclear power plant equipment parts according to claim 9, characterized in that: The heating mechanism (300) comprises a power supply structure (301) and a heating structure (302) arranged inside the inner cavity (101).

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