Device and method for removing radioactive impurities in pipeline

Abstract

The invention relates to the technical field of nuclear power plant reactor operation and radiation protection, in particular to a tool for removing radioactive impurities in a pipeline and a removing method thereof.The device comprises a motor, a driving gear, a driven gear, a connecting assembly, a piston knocking column, a piston cylinder and a rubber pipe clamp; the driving gear is meshed with a driven gear, the driven gear is connected with a piston knocking column through a connecting device, and the piston knocking column is driven by a motor to knock a rubber pipe clamp. A piston cylinder body is arranged outside the piston knocking column, and a rubber pipe clamp is arranged at the top end of the piston cylinder body and used for clamping a pipeline. Through the technical means of removing radioactive impurities in the pipeline in a non-intrusive mode, the technical effect of eliminating radioactive hot spots is achieved, conversion of a radiation protection means from passive protection to active elimination is achieved, extra irradiation on workers is reduced, the personal dose and the collective dose are reduced, and the working efficiency is improved. And the occupational health of workers is improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of nuclear power plant reactor operation and radiation protection, and particularly relates to a device for removing radioactive impurities inside a pipeline and a method for removing the same. Background Art

[0002] A hot spot refers to a very small part or local area where the radiation level is far higher than the surrounding environment. Hot spots are often formed by hot particles with extremely high radiation levels. These hot particles are generally tiny particles with very small particle sizes and strong activities in the reactor coolant. There are multiple radioactive hot spots in each plant within the radiation control area of a nuclear power unit. Radioactive hot spots are generated along with the operation of the power plant, and as the operation time of the unit increases, the radioactive hot spots show a trend of increasing radioactive dose rate and increasing quantity. This results in additional irradiation of the staff, increasing the individual dose and collective dose, and affecting the occupational health of the staff.

[0003] Currently, the radiation protection work adopted in the nuclear power industry generally follows the protection means of the three elements of radiation protection: time protection, distance protection, and shielding protection. The three elements of radiation protection have mature application experiences and protection achievements in the nuclear power industry. However, it tends to be "passive protection" and lacks the enthusiasm of "actively eliminating", and does not eliminate the radioactive source term, and the radiation protection effect has obvious limitations. It is inevitable for radiation workers such as operation and maintenance to work around radioactive hot spots or directly on the equipment where the radioactive hot spots are located. In the prior art, there is a lack of a device and a method for eliminating radioactive hot spots inside the pipeline. Summary of the Invention

[0004] The present invention provides a device for removing radioactive impurities inside a pipeline and a method for removing the same, which are used to solve the problems that there is a lack of a device and a method for removing radioactive hot spots inside the pipelines of nuclear power plants in the prior art.

[0005] The technical solution of the present invention:

[0006] The present invention provides a device for removing radioactive impurities inside a pipeline, which includes: a motor, a driving gear, a driven gear, a connecting assembly, a piston knocking column, a piston cylinder block, and a rubber pipe clamp. The high-frequency motor is connected to the driving gear, the driving gear meshes with the driven gear, the driven gear is connected to the piston knocking column through a connecting device, and the piston knocking column knocks the rubber pipe clamp under the drive of the motor; a piston cylinder block is arranged outside the piston knocking column, and a rubber pipe clamp is arranged at the top of the piston cylinder block, and the rubber pipe clamp is used for clamping the pipeline.

[0007] In some embodiments, a housing is arranged outside the device, and the high-frequency motor, the driving gear, the driven gear, the connecting assembly, the piston knocking column, and the piston cylinder block are arranged inside the housing, and the housing is used to protect the internal structure.

[0008] In some embodiments, a rotating handle is provided on the outer shell, and the rotating handle is used to adjust the angle of the device to remove radioactive impurities from the pipeline in different directions.

[0009] In some embodiments, the connecting component includes a connecting column, a connecting rod, and a connecting keyway. The connecting column is provided on the driven gear. One end of the connecting column is connected to the connecting rod, and the other end of the connecting rod is provided with a connecting keyway, and the connecting keyway is provided on the piston knocking column.

[0010] In some embodiments, an adjusting knob is provided on the rubber hose clamp, and the adjusting knob is used to fix the rubber hose clamp on the pipeline.

[0011] The present invention provides a method for removing radioactive impurities inside a pipeline, and the method includes:

[0012] Step 1: Fix the tool on the pipeline through a rubber hose clamp;

[0013] Step 2: Start the motor. The high-frequency motor drives the driving gear, the driving gear drives the driven gear, the driven gear drives the connecting rod to move through the connecting column, and the connecting rod drives the piston knocking column to reciprocate through the connecting keyway; the piston knocking column knocks the rubber hose clamp, and the rubber hose clamp conducts vibration to the pipeline to form a non-rigid knocking vibration on the pipeline.

[0014] Step 3: Loosen the adjusting knob, adjust the rubber hose clamp, rotate the device through the rotating handle, perform a 360-degree knocking vibration on the pipeline, so that the compacted radioactive impurities in the pipeline are knocked into a loose state, and are discharged to the downstream collection system and treatment system along with the flow of the medium in the pipeline.

[0015] Implementing the present invention has the following beneficial effects:

[0016] The present invention provides a device for removing radioactive impurities inside a pipeline and a method for removing the same. Through the non-invasive technical means of removing radioactive impurities inside the pipeline, the technical effect of eliminating radioactive hot spots is achieved, the conversion of radiation protection means from "passive protection" to "active elimination" is realized, the additional irradiation received by the staff is reduced, the individual dose and the collective dose are reduced, the occupational health of the staff is improved, and the operation performance in nuclear power radiation protection is improved. Description of the Drawings

[0017] Figure 1 Schematic diagram of a device for removing radioactive impurities inside a pipeline proposed by an embodiment of the present invention;

[0018] Description of the Drawings: 1. Motor; 2. Driving gear; 3. Driven gear; 4. Connecting column; 5. Connecting rod; 6. Connecting keyway; 7. Piston knocking column; 8. Piston cylinder block; 9. Rubber hose clamp; 10. Adjusting knob; 11. Pipeline; 12. Outer shell; 13. Rotating handle. Detailed Embodiments

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention provides a device for removing radioactive impurities inside a pipeline. The device includes: a motor 1, a driving gear 2, a driven gear 3, a connecting assembly, a piston knocking column 7, a piston cylinder 8, and a rubber pipe clamp 9. The high-frequency motor 1 is connected to the driving gear 2, the driving gear 2 meshes with the driven gear 3, and the driven gear 3 is connected to the piston knocking column 7 through a connecting device. The connecting assembly includes a connecting column 4, a connecting rod 5, and a connecting keyway 6. The connecting column 4 is provided on the driven gear 3, one end of the connecting column 4 is connected to the connecting rod 5, and the other end of the connecting rod 5 is provided with the connecting keyway 6. The connecting keyway 6 is provided on the piston knocking column 7. The piston knocking column 7 knocks the rubber pipe clamp 9 under the drive of the motor 1; the piston cylinder 8 is arranged outside the piston knocking column 7, and the rubber pipe clamp 9 is arranged at the top of the piston cylinder 8. The rubber pipe clamp 9 is used to clamp the pipeline 11. The rubber pipe clamp 9 is provided with an adjusting knob 10, and the adjusting knob 10 is used to fix the rubber pipe clamp 9 on the pipeline 11.

[0021] In some embodiments, a housing 12 is provided outside the device. The high-frequency motor 1, the driving gear 2, the driven gear 3, the connecting assembly, the piston knocking column 7, and the piston cylinder 8 are arranged inside the housing 12, and the housing 12 is used to protect the internal structure. The housing 12 is provided with a rotating handle 13, and the rotating handle 13 is used to adjust the angle of the device to remove radioactive impurities from the pipeline 11 in different directions.

[0022] Through the technical means of non-invasive removal of radioactive impurities inside the pipeline, the present invention achieves the technical effect of eliminating radioactive hot spots, realizes the conversion of radiation protection means from "passive protection" to "active elimination", reduces the additional irradiation received by the staff, reduces the individual dose and the collective dose, improves the occupational health of the staff, and improves the operation index in nuclear power radiation protection.

[0023] The present invention provides a method for removing radioactive impurities inside a pipeline. The method includes:

[0024] Step 1: Fix the tool on the pipeline 11 through the rubber pipe clamp 9;

[0025] Step 2: Start the motor 1. The motor 1 drives the piston knocking column 7 to knock the rubber pipe clamp 9, and the rubber pipe clamp 9 conducts vibration to the pipeline 11 to form a non-rigid knocking vibration on the pipeline 11.

[0026] Step 3: Loosen the adjustment knob 10, rotate the device by turning the handle 13, perform 360-degree knocking vibration on the pipeline 11, so that the compacted radioactive impurities in the pipeline 11 are knocked into a loose state, and are discharged to the downstream collection and treatment system along with the medium flow in the pipeline 11.

[0027] The present invention proposes a removal method for removing radioactive impurities inside a pipeline tool. Taking the elimination of radioactive hot spots inside the L-shaped pipeline 11 as an example, the implementation method of the present invention is specifically described.

[0028] Due to the change in flow direction, radioactive impurities are extremely likely to accumulate at the low point of the horizontal pipe section of the L-shaped pipeline 11 in a nuclear power plant, thus forming radioactive hot spots. The radioactive dose rate at the blind end of a certain L-shaped pipeline 11 is 17,200 μSv / h. In the prior art, it is isolated by a lead shielding layer, and through the "shielding protection" method, the effective dose received by the staff is reduced. However, due to work needs, when personnel perform work at the hot spot, the lead shielding layer often needs to be temporarily removed, resulting in the failure of the lead shielding.

[0029] As Figure 1 shown, use the rubber hose clamp 9 of this tool to wrap around the blind end of the L-shaped pipeline 11. The staff adjusts the direction of the rotating handle 13 according to the on-site space conditions for easy operation, and through components such as the motor 1, the driving gear 2, the driven gear 3, and the piston knocking column 7, convert the high-frequency rotational motion of the motor 1 into a high-frequency axial motion, so that the piston knocking column 7 hits the rubber hose clamp 9 frequently, and finally forms a non-rigid high-frequency knocking vibration on the pipeline 11. To ensure the effect, perform 360-degree knocking vibration on the blind end of the L-shaped pipeline 11 by adjusting the direction of the rotating handle 13, so that the compacted radioactive impurities gradually become loose and are discharged to the downstream collection and treatment system.

[0030] Through the on-site application of this non-intrusive tool for removing radioactive impurities inside the pipeline, the radioactive dose rate at the blind end of the L-shaped pipeline 11 gradually decreases from 17,200 μSv / h to 70.5 μSv / h, which is lower than the radioactive hot spot control threshold of 500 μSv / h, and the reduction rate is as high as 96%. Through the successful implementation of this solution on-site, it is verified that the present invention has an efficient removal effect, and can achieve the purposes of eliminating radioactive hot spots, reducing the radioactive level of the plant environment, reducing the additional exposure received by the staff, reducing the individual dose and the collective dose, improving the occupational health of the staff, and improving the operation performance in nuclear power radiation protection.

[0031] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A device for removing radioactive impurities inside a pipeline, characterized in that: The device comprises: a motor, a driving gear, a driven gear, a connecting assembly, a piston knocking column, a piston cylinder and a rubber tube clamp, wherein the high-frequency motor is connected to the driving gear, the driving gear is meshed with the driven gear, the driven gear is connected to the piston knocking column through the connecting assembly, and the piston knocking column knocks the rubber tube clamp under the drive of the motor; the piston cylinder is provided on the outside of the piston knocking column, the rubber tube clamp is provided on the top of the piston cylinder, and the rubber tube clamp is used to clamp the pipeline.

2. The device for removing radioactive impurities from inside a pipeline according to claim 1, characterized in that: The device is provided with a shell on the outside, and the high-frequency motor, the driving gear, the driven gear, the connecting assembly, the piston knocking column and the piston cylinder are arranged in the shell, and the shell is used to protect the internal structure.

3. The device for removing radioactive impurities from inside a pipeline according to claim 2, characterized in that: The shell is provided with a rotating handle, and the rotating handle is used to adjust the angle of the device to remove radioactive impurities from the pipeline from different directions.

4. The device for removing radioactive impurities from inside a pipeline according to claim 1, characterized in that: The connecting assembly includes a connecting column, a connecting rod and a connecting keyway, wherein the connecting column is arranged on the driven gear, the connecting column is connected to one end of the connecting rod, the other end of the connecting rod is provided with the connecting keyway, and the connecting keyway is arranged on the piston knocking column.

5. The device for removing radioactive impurities from inside a pipeline according to claim 1, characterized in that: The rubber tube clamp is provided with an adjusting knob, and the adjusting knob is used to fix the rubber tube clamp on the pipeline.

6. A method for removing radioactive impurities from inside a pipeline as claimed in any one of claims 1 to 5, characterized in that: The method comprises: Step 1: Fix the device on the pipeline through the rubber pipe clamp; Step 2: Start the motor, the high-frequency motor drives the driving gear, the driving gear drives the driven gear, the driven gear drives the connecting rod to move through the connecting column, and the connecting rod drives the piston knocking column to reciprocate through the connecting key slot; the piston knocking column knocks the rubber tube clamp, and the rubber tube clamp transmits vibration to the pipeline, forming non-rigid knocking vibration on the pipeline. Step 3: Loosen the adjustment knob, adjust the rubber pipe clamp, rotate the device by rotating the handle, and perform 360-degree knocking and vibration on the pipeline to loosen the compacted radioactive impurities in the pipeline and discharge them to the downstream collection system and treatment system as the medium flows in the pipeline.

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