CN112366018A - Automatic valve chamber radioactive dirt removing device and method - Google Patents
Automatic valve chamber radioactive dirt removing device and method Download PDFInfo
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- CN112366018A CN112366018A CN202011229159.2A CN202011229159A CN112366018A CN 112366018 A CN112366018 A CN 112366018A CN 202011229159 A CN202011229159 A CN 202011229159A CN 112366018 A CN112366018 A CN 112366018A
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- 230000002285 radioactive effect Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005202 decontamination Methods 0.000 claims abstract description 100
- 230000003588 decontaminative effect Effects 0.000 claims abstract description 97
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000002923 metal particle Substances 0.000 claims abstract description 14
- 239000000941 radioactive substance Substances 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 239000000428 dust Substances 0.000 claims description 34
- 238000005201 scrubbing Methods 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 18
- 238000012423 maintenance Methods 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 14
- 238000011109 contamination Methods 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 5
- 238000004380 ashing Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000002901 radioactive waste Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- 239000010941 cobalt Substances 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 6
- 239000004744 fabric Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/20—Disposal of liquid waste
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/34—Disposal of solid waste
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of dirt in a valve chamber, and particularly relates to an automatic radioactive dirt removing device and method for the valve chamber, which comprises a movable trolley, a filter, a fluid transmission pump, a mechanical arm and a communicating pipeline, wherein the movable trolley is arranged on the movable trolley; the device and the method can replace manual work to automatically remove radioactive substances, residual radioactive liquid and metal particles generated by grinding deposited in the valve cavity, reduce the radiation irradiation and pollution risks of personnel, improve the decontamination effect, reduce the radiation source item of a unit, reduce the generation amount of radioactive waste and improve the field work efficiency.
Description
Technical Field
The invention belongs to the technical field of dirt inside a valve chamber, and particularly relates to an automatic removing device and method for radioactive dirt in the valve chamber.
Background
At present, in the radioactive environment inside a nuclear power plant, the manual decontamination mode is generally adopted for removing radioactive dirt (solid and liquid) inside a valve chamber. And removing radioactive substances deposited in the valve cavity and metal particles generated by grinding the sealing surface of the valve seat by adopting a manual wiping mode, and cleaning the residual radioactive liquid in the valve cavity by adopting manual wiping or using a simple suction tool.
The existing decontamination mode has the following problems: (1) the dose rate in the valve cavity can reach dozens of mSv/h to hundreds of mSv/h, and decontamination personnel can be exposed to high radiation irradiation and pollution risks; (2) under the high radiation irradiation environment, the operation time must be strictly controlled, decontamination personnel can only simply wipe, and the decontamination effect is poor; (3) cleaning cloth and tools used in the decontamination process become high-dosage rate waste after being polluted, the amount of radioactive waste is increased, and the irradiation dosage of personnel can be further increased during waste collection and transportation; (4) the manual decontamination is difficult to remove stubborn dirt and metal particles, and the decontamination effect is poor.
During the overhaul period of a nuclear power plant, a large amount of valve disassembly and maintenance work needs to be carried out, and grinding of sealing surfaces inside a valve cavity or replacement of parts needs to be carried out on a part of valves. Due to the structural characteristics of the valve cavity and the arrangement condition of pipelines, radioactive substances and residual radioactive liquid with high dose rate (dozens of mSv/h to hundreds of mSv/h) are easy to deposit in the valve cavity, so that higher dose irradiation is caused to maintainers, and the development of maintenance work is influenced; on the other hand, the hardfacing layer of the valve sealing surface is mainly made of cobalt-containing alloy materials, such as Stellite6 alloy (the content of Co-59 element is 53.9%), EPRI (American electric research institute) research shows that grinding of the valve sealing surface can generate cobalt-containing metal particles with the size of 4-40 μm, the particles can keep a suspension state due to the movement of water molecules and can circulate in a loop of a nuclear power unit for a long time, the cobalt-containing (Co-59) metal particles can be activated by neutrons to generate Co-60 after entering a reactor core, and taking 40g of cobalt entering the loop system every year as an example, about 3200Ci of Co-60 can be generated after two cycles, so that the radiation source level of the nuclear power unit is continuously increased. Therefore, decontamination work must be performed on the interior of the valve cavity to remove radioactive residues deposited on the interior of the valve cavity, residual radioactive liquid, and cobalt (Co-59) -containing metal particles generated by grinding.
The problems of high risk of radiation irradiation and pollution, poor decontamination effect, increase of radioactive wastes, low working efficiency and the like exist in the development of manual decontamination work inside the valve cavity of the valve.
Disclosure of Invention
In view of the above disadvantages, the present invention provides an automatic valve chamber radioactive contamination removing device and method, which can replace manual work to automatically remove radioactive substances, residual radioactive liquid and metal particles generated by grinding deposited inside a valve chamber, reduce the radiation irradiation and pollution risks of personnel, improve the decontamination effect, reduce the radiation source item of a unit, reduce the generation amount of radioactive waste, and improve the field work efficiency.
The technical scheme of the invention is as follows:
an automatic radioactive dirt removing device for a valve chamber comprises a movable trolley, a filter, a fluid transmission pump, a mechanical arm and a communicating pipeline;
the filter and the filter shielding shell are arranged on the left side of the middle part of the movable trolley, the filter is arranged in the filter shielding shell, and a filter shielding shell cover plate is arranged on the upper part of the filter shielding shell;
a fluid transfer pump is arranged on the right side of the middle part of the movable trolley and is fixed in the movable trolley through a support; the filter is communicated with the fluid transfer pump through a pipeline c, and the right end of the pipeline c is connected with a sewage discharge outlet through a valve a;
a pipeline a is arranged above the inner part of the movable trolley, the upper end of the right side of the pipeline a is connected with a quick connector female connector a through a valve b, a tee joint a and a tee joint a are arranged in the middle of the pipeline a, the lower part of the tee joint a is connected with a pipeline c, the upper part of the tee joint b is communicated with a pipeline b, and the left end of the pipeline a is connected with the quick connector female connector b through a valve d;
the mechanical arm base is fixed on the left side of the top of the movable trolley, the mechanical arm is fixed at the upper end of the mechanical arm base, a pipeline b is arranged inside the mechanical arm and the mechanical arm base, a valve c is arranged on the lower portion of the pipeline b, and an irradiation-resistant camera and a quick-acting joint female joint c are arranged at the front end of the mechanical arm.
The quick connector female joint c at the front end of the mechanical arm is connected with the quick connector male joint a at the top of the water absorption, dust absorption and cleaning head, and the lower end of the water absorption, dust absorption and cleaning head is provided with an opening.
The quick connector female joint c at the front end of the mechanical arm is connected with the quick connector male joint b at the top of the scrubbing and decontaminating head, the middle part of the scrubbing and decontaminating head is provided with an ultrasonic generator, and the lower part of the scrubbing and decontaminating head is provided with a hairbrush.
The brush can be detached and replaced.
The bottom of the movable trolley is provided with a guide wheel.
The cover plate of the filter shielding shell is an openable cover plate.
The mechanical arm is a degree of freedom mechanical arm.
A valve chamber radioactive dirt automatic removing method, step one, after the maintenance personnel open the valve flange and take away the valve gap, the decontamination personnel move the valve chamber radioactive dirt automatic removing device to the place near the valve waiting for decontamination, arrange the waste liquid collecting vessel in the drain outlet, close valve a, valve c, open valve a, valve b, connect the dust-collecting decontamination head of water absorption to the quick-operation joint female joint of the front end of the multi-mechanical arm through the quick-operation joint male joint, start the fluid transfer pump, the pneumatic valve chamber sucks the dust-collecting process of water automatically, the radioactive solid, liquid mixture of clearing valve chamber bottom, the radioactive solid, liquid mixture is along sucking the dust-collecting decontamination head, pipeline b, tee bend b, pipeline c, filter, fluid transfer pump, discharge to the drain;
step two, after the first valve cavity automatic water absorption and dust collection process is completed, a decontamination worker moves the valve cavity radioactive dirt automatic removing device to a position far away from the valve, after a maintenance worker removes the valve clack, the decontamination worker moves the valve cavity radioactive dirt automatic removing device to a position close to the valve, the decontamination worker remotely controls the mechanical arm, observes the dirt condition in the valve cavity through an irradiation camera, connects a scrubbing decontamination head to a quick connector female connector c at the front end of the mechanical arm through a quick connector male connector b, starts an ultrasonic generator, automatically scrubs and decontaminates the valve cavity through a pneumatic valve cavity, and executes the valve cavity automatic water absorption and dust collection process in the step one again to clean the residual dirt after the valve cavity is scrubbed and remove the dirt, so that the radiation level in the valve cavity is further reduced;
step three, after the valve cavity automatic scrubbing and decontaminating process and the second valve cavity automatic water and dust absorption process are finished, a decontaminating worker moves the valve cavity radioactive dirt automatic removing device to a position far away from the valve, after a maintenance worker grinds a valve seat sealing surface, the decontaminating worker moves the valve cavity radioactive dirt automatic removing device to a position close to the valve, a clean hairbrush is replaced, a scrubbing and decontaminating head is connected to a quick connector female connector c at the front end of a mechanical arm through a quick connector male connector b, an ultrasonic generator is started, the decontaminating worker performs the valve seat sealing surface automatic cleaning and decontaminating process on a remote centralized control console, and performs the valve cavity automatic water and dust absorption process in the step one again to clean metal particles on the surface of the valve seat sealing surface;
fourthly, the decontamination personnel monitors the decontamination condition on a remote centralized control console by using an irradiation-resistant camera at the front end of the mechanical arm, and if abnormity is found, emergency operation is carried out to stop decontamination work;
fifthly, for the condition that the internal structure of the valve cavity is complex or the automatic decontamination program is not thoroughly decontaminated, a decontamination worker controls the mechanical arm to carry out remote control decontamination on a remote centralized control console, and simultaneously observes the decontamination condition through an irradiation-resistant camera at the front end of the mechanical arm;
step six, in the valve cavity decontamination process, radioactive substances may be deposited in the pipelines and valves of the automatic valve cavity radioactive dirt removing device, and relevant pipelines and valves can be washed and decontaminated, and the specific method comprises the following steps:
opening the valve a and the valve b, closing the valve c and the valve d, connecting an external flushing pipeline with a quick connector male connector to a quick connector female connector a8, and flushing and decontaminating the pipeline a, the pipeline c, the filter, the fluid transfer pump and the valve a;
opening the valve b and the valve c, closing the valve a and the valve d, connecting an external flushing pipeline with a quick connector male connector to the quick connector female connector a, and flushing and decontaminating the pipeline a, the pipeline b and the valve c;
and opening the valve b and the valve d, closing the valve a and the valve c, connecting an external flushing pipeline with a quick connector male connector to the quick connector female connector a, and flushing and decontaminating the pipeline a and the valve d.
And step five, when automatic decontamination is difficult to execute due to limited space of the installation position of the valve and small size of the valve, a decontaminating person communicates the water absorption dust absorption decontamination head with the quick connector female connector by using a hose with two ends respectively provided with the quick connector male connector and the quick connector female connector, closes the valve b and the valve c, opens the valve a and the valve d, starts the fluid transmission pump, manually absorbs water, absorbs dust and decontaminates by holding the water absorption dust absorption decontamination head by hand, and manually scrubs the decontamination head by hand.
The invention has the beneficial effects that:
utilize valve chamber radioactive waste automatic removal device to replace the manual work to develop the inside decontamination work of valve pocket, can effectively reduce decontamination personnel and maintenance personal radiation dose, promote decontamination effect and decontamination efficiency, get rid of the radioactive waste in the valve pocket and grind the metal particle that produces, reduce maintenance personal irradiated dose and reduce unit radiation source item, reduce radioactive waste production volume and radioactive waste and shine to staff's radiation simultaneously, specifically as follows:
(1) the automatic radioactive dirt removing device for the valve cavity replaces a person to carry out decontamination work inside the valve cavity, decontamination is automatically carried out after a decontamination worker completes equipment installation near a valve to be decontaminated, the decontamination worker remotely monitors a decontamination process through a camera, radiation irradiation dose of the decontamination worker is obviously reduced, and the decontamination worker is prevented from being irradiated by higher dose in the decontamination process;
(2) the automatic radioactive dirt removing device for the valve cavity can perform decontamination operation for a long time, various decontamination heads are used for performing targeted decontamination on different parts (including the bottom of the valve cavity and the sealing surface of the valve seat) and different radioactive substances (including solid and liquid radioactive substances), the decontamination effect and the decontamination efficiency are obviously improved, the problems that the decontamination time is limited (personnel operation time must be limited under a high-radiation environment) and the decontamination effect is poor and the decontamination efficiency is low due to the fact that only cleaning cloth and other simple manners are used for decontamination in the conventional manual decontamination manner are solved, the irradiation dose of valve maintenance personnel is reduced by reducing the radiation level in the valve cavity through high-efficiency decontamination, and meanwhile, cobalt (Co-59) containing metal particles generated by grinding the valve seat are removed, so that the situation that the metal particles are activated by a reactor core to increase the radiation source;
(3) the automatic valve chamber radioactive dirt removing device utilizes the built-in filter to filter solid and liquid radioactive substances, and a radiation shielding device is arranged on the filter, so that the consumption of materials such as the existing manual decontamination cloth is avoided, the generation amount of radioactive waste is reduced, and the radiation irradiation of the radioactive waste to other workers is reduced.
Drawings
FIG. 1 is a schematic structural view of an automatic valve chamber radioactive contaminant removing apparatus according to the present invention;
in the figure: 1. a guide wheel of the movable trolley; 2. moving the trolley; 3. a support; 4. a sewage draining outlet; 5. a valve a; 6. a fluid transfer pump; 7. a valve b; 8. a quick connector female connector a; 9. a filter shield housing cover plate; 10. a pipeline a; 11. a tee joint a; 12. a tee joint b; 13. a pipe b; 14. a mechanical arm; 15. a mechanical arm base; 16. a valve c; 17. a valve d; 18. a quick connector female connector b; 19. a camera; 20. a quick connector female connector c; 21. a quick connector male connector a; 22. a water absorption dust absorption and removal head; 23. a quick connector male connector b; 24. brushing and cleaning the decontamination head; 25. an ultrasonic generator; 26. a brush; 27. a pipe c; 28. a filter; 29. the filter shields the housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the automatic radioactive dirt removing device for the valve chamber shown in fig. 1, the guide wheel 1 is arranged at the bottom of the movable trolley 2, the filter 28 and the filter shielding shell 29 are arranged on the left side of the middle of the movable trolley, the filter 28 is arranged inside the filter shielding shell 29, the filter shielding shell cover plate 9 is arranged at the upper part of the filter shielding shell 29, and the filter shielding shell cover plate 9 is an openable cover plate;
a fluid transfer pump 6 is arranged on the right side of the middle part of the movable trolley 2, and the fluid transfer pump 6 is fixed inside the movable trolley 2 through a support 3; the filter 28 is communicated with the fluid transfer pump 6 through a pipeline c27, and the right end of the pipeline c27 is connected with the sewage outlet 4 through a valve a 5;
a pipeline a10 is arranged above the inner part of the movable trolley 2, the upper end of the right side of the pipeline a10 is connected with a quick connector female joint a8 through a valve b7, a tee joint a11 and a tee joint a12 are arranged in the middle of the pipeline a10, the lower part of the tee joint a11 is connected with a pipeline c27, the upper part of the tee joint b12 is communicated with the pipeline b13, and the left end of the pipeline a10 is connected with a quick connector female joint b18 through a valve d 17;
the mechanical arm base 15 is fixed on the left side of the top of the movable trolley 1, the mechanical arm 14 is a 5-degree-of-freedom mechanical arm and is fixed at the upper end of the mechanical arm base 15, a pipeline b13 is arranged inside the mechanical arm 14 and the mechanical arm base 15, a valve c16 is arranged at the lower part of a pipeline b13, and an irradiation-resistant camera 19 and a quick-coupling female joint c20 are arranged at the front end of the mechanical arm 14;
the male connector a21 of the quick connector at the top of the water absorption, dust collection and cleaning head 22 can be connected with the female connector c20 of the quick connector at the front end of the mechanical arm 14, and the lower end of the water absorption, dust collection and cleaning head 22 is an opening;
the male joint b23 of the quick connector at the top of the scrubbing and cleaning head 24 can be connected with the female joint c20 of the quick connector at the front end of the mechanical arm 14, the ultrasonic generator 25 is arranged at the middle part of the scrubbing and cleaning head 24, the brush 26 is arranged at the lower part of the scrubbing and cleaning head 24, and the brush 26 can be detached and replaced.
Accordingly, the method of use of the decontamination device of the present invention is as follows:
1) after a maintenance worker opens the valve flange and takes the valve cover away, the decontamination worker moves the automatic radioactive dirt removing device of the valve chamber to the position near a valve to be decontaminated, a waste liquid collecting barrel is arranged at the outlet of the sewage outlet 4, the valve a7 and the valve c17 are closed, the valve a5 and the valve b16 are opened, the water, dust and dirt absorbing and removing head 22 is connected to the quick connector female connector 20 at the front end of the multi-mechanical arm 14 through the quick connector male connector 21, the fluid transfer pump 6 is started, the decontamination worker executes a preset automatic water and dust absorbing program a of the valve chamber on a remote centralized control console (not shown in the figure), and radioactive solid and liquid mixtures at the bottom of the valve chamber are cleaned, and the radioactive solid and liquid mixtures are discharged out of the sewage outlet 4 along the water, dirt and dust absorbing and removing head 22, the pipeline b13, the tee joint b12, the pipeline c27, the filter 28 and the fluid transfer. The radioactive solid-liquid mixture at the bottom of the valve cavity is cleaned, so that the radiation level in the valve cavity is reduced, and a waterless environment is created for the follow-up valve clack dismantling work of maintenance personnel.
2) After the automatic water absorption and dust collection procedure a of the valve cavity is finished, a decontamination worker moves the automatic radioactive dirt removing device of the valve cavity to a position far away from the valve, after a maintenance worker removes the valve clack, the decontamination worker moves the automatic radioactive dirt removing device of the valve cavity to a position close to the valve, the decontamination worker remotely controls the mechanical arm 14, observing the dirt inside the valve cavity through the irradiation camera 20, connecting the scrubbing and cleaning head 24 to a quick connector female connector c20 at the front end of the mechanical arm 14 through a quick connector male connector b23, starting the ultrasonic generator 25, performing a valve cavity automatic scrubbing and cleaning program b on a remote centralized control console by a cleaning worker, and executing the automatic water absorption and dust collection procedure a of the valve cavity in the step 1) again, cleaning the residual dirt cleaned by the valve cavity, further reducing the radiation level in the valve cavity, and reducing the irradiated dose for subsequent maintenance personnel to execute valve grinding work.
3) After the valve cavity automatic scrubbing and decontaminating procedure b and the second valve cavity automatic water absorbing and dust collecting procedure a are finished, the automatic radioactive dirt removing device for the valve chamber is moved to a position far away from the valve by a decontamination worker, and after the valve seat sealing surface is ground by a maintenance worker, the decontamination personnel moves the automatic valve chamber radioactive dirt removing device to a position close to the valve, a clean hairbrush 26 is replaced, the scrubbing and decontamination head 24 is connected to a quick connector female connector c20 at the front end of the mechanical arm 14 through a quick connector male connector b23, the ultrasonic generator 25 is started, the decontamination personnel executes an automatic valve seat sealing surface cleaning and decontamination procedure c on a remote centralized control console, and executing the automatic water and dust absorption procedure a of the valve cavity in the step 1) again to clean the metal particles on the surface of the sealing surface of the valve seat and avoid the metal particles from being activated by the reactor core subsequently.
4) The decontamination personnel monitors the decontamination condition on a remote centralized control console by using an irradiation-resistant camera 19 at the front end of the mechanical arm 14, and if abnormity is found, emergency operation is carried out to stop decontamination work.
5) For the situation that the internal structure of the valve cavity is complex or the automatic decontamination program is not thoroughly decontaminated, a decontamination worker controls the mechanical arm 14 on a remote centralized control console to carry out remote control decontamination, and simultaneously observes the decontamination condition through the radiation-resistant camera 19 at the front end of the mechanical arm 14. In addition, when automatic decontamination is difficult to perform due to limited space of the valve installation position and small valve size, a decontamination worker communicates the water absorption, dust collection and decontamination head 22 with the quick connector female connector 18 by using a hose with a quick connector male connector and a quick connector female connector respectively arranged at two ends, closes the valve b8 and the valve c16, opens the valve a5 and the valve d17, then starts the fluid transmission pump 6, holds the water absorption, dust collection and decontamination head 22 by hand to perform manual water absorption, dust collection and decontamination, and holds the decontamination head 24 by hand to perform manual scrubbing and decontamination.
6) In the valve cavity decontamination process, radioactive substances may be deposited in the pipelines and valves of the automatic radioactive dirt removing device for the valve cavity, and related pipelines and valves can be washed for decontamination, and the specific method comprises the following steps:
opening a valve a5, a valve b7, closing a valve c16 and a valve d17, connecting an external flushing pipeline with a quick connector male connector to a quick connector female connector a8, and flushing and decontaminating a pipeline a10, a pipeline c27, a filter 28, a fluid transfer pump 6 and a valve a 5;
opening a valve b7 and a valve c16, closing a valve a5 and a valve d17, connecting an external flushing pipeline with a quick connector male connector to a quick connector female connector a8, and flushing and decontaminating the pipeline a10, the pipeline b13 and the valve c 16;
opening the valve b7 and the valve d17, closing the valve a5 and the valve c16, connecting an external flushing pipeline with a quick connector male connector to the quick connector female connector a8, and flushing and decontaminating the pipeline a10 and the valve d 17.
In the drawings of the disclosed embodiments of the invention, only methods related to the disclosed embodiments are referred to, other methods can refer to common design, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. An automatic radioactive dirt removing device for a valve chamber comprises a movable trolley, a filter, a fluid transmission pump, a mechanical arm and a communicating pipeline;
the method is characterized in that: the filter and the filter shielding shell are arranged on the left side of the middle part of the movable trolley, the filter is arranged in the filter shielding shell, and a filter shielding shell cover plate is arranged on the upper part of the filter shielding shell;
a fluid transfer pump is arranged on the right side of the middle part of the movable trolley and is fixed in the movable trolley through a support; the filter is communicated with the fluid transfer pump through a pipeline c, and the right end of the pipeline c is connected with a sewage discharge outlet through a valve a;
a pipeline a is arranged above the inner part of the movable trolley, the upper end of the right side of the pipeline a is connected with a quick connector female connector a through a valve b, a tee joint a and a tee joint a are arranged in the middle of the pipeline a, the lower part of the tee joint a is connected with a pipeline c, the upper part of the tee joint b is communicated with a pipeline b, and the left end of the pipeline a is connected with the quick connector female connector b through a valve d;
the mechanical arm base is fixed on the left side of the top of the movable trolley, the mechanical arm is fixed at the upper end of the mechanical arm base, a pipeline b is arranged inside the mechanical arm and the mechanical arm base, a valve c is arranged on the lower portion of the pipeline b, and an irradiation-resistant camera and a quick-acting joint female joint c are arranged at the front end of the mechanical arm.
2. The automatic valve chamber radioactive contamination removing device according to claim 1, wherein: the quick connector female joint c at the front end of the mechanical arm is connected with the quick connector male joint a at the top of the water absorption, dust absorption and cleaning head, and the lower end of the water absorption, dust absorption and cleaning head is provided with an opening.
3. The automatic valve chamber radioactive contamination removing device according to claim 1, wherein: the quick connector female joint c at the front end of the mechanical arm is connected with the quick connector male joint b at the top of the scrubbing and decontaminating head, the middle part of the scrubbing and decontaminating head is provided with an ultrasonic generator, and the lower part of the scrubbing and decontaminating head is provided with a hairbrush.
4. An automatic valve chamber radioactive contamination removing device according to claim 3, wherein: the brush can be detached and replaced.
5. An automatic valve chamber radioactive contamination removing device according to any one of claims 1 to 4, wherein: the bottom of the movable trolley is provided with a guide wheel.
6. An automatic valve chamber radioactive contamination removing device according to any one of claims 1 to 4, wherein: the cover plate of the filter shielding shell is an openable cover plate.
7. An automatic valve chamber radioactive contamination removing device according to any one of claims 1 to 4, wherein: the mechanical arm is a degree of freedom mechanical arm.
8. A method for automatically removing radioactive dirt in a valve chamber is characterized by comprising the following steps:
step one, after a maintenance worker opens a valve flange and takes a valve cover away, the maintenance worker moves a valve cavity radioactive dirt automatic removing device to the position near a valve to be decontaminated, a waste liquid collecting barrel is arranged at an outlet of a sewage outlet, the valve a and the valve c are closed, the valve a and the valve b are opened, a water absorption, dust absorption and decontamination head is connected to a quick connector female connector at the front end of a multi-mechanical arm through a quick connector male connector, a fluid transmission pump is started, a pneumatic valve cavity automatically absorbs water and dust, a radioactive solid-liquid mixture at the bottom of the valve cavity is cleaned, and the radioactive solid-liquid mixture is discharged out of the sewage outlet along the water absorption, dust absorption and decontamination head, a pipeline b, a tee joint b, a pipeline c, a filter and the fluid transmission pump;
step two, after the first valve cavity automatic water absorption and dust collection process is completed, a decontamination worker moves the valve cavity radioactive dirt automatic removing device to a position far away from the valve, after a maintenance worker removes the valve clack, the decontamination worker moves the valve cavity radioactive dirt automatic removing device to a position close to the valve, the decontamination worker remotely controls the mechanical arm, observes the dirt condition in the valve cavity through an irradiation camera, connects a scrubbing decontamination head to a quick connector female connector c at the front end of the mechanical arm through a quick connector male connector b, starts an ultrasonic generator, automatically scrubs and decontaminates the valve cavity through a pneumatic valve cavity, and executes the valve cavity automatic water absorption and dust collection process in the step one again to clean the residual dirt after the valve cavity is scrubbed and remove the dirt, so that the radiation level in the valve cavity is further reduced;
step three, after the valve cavity automatic scrubbing and decontaminating process and the second valve cavity automatic water and dust absorption process are finished, a decontaminating worker moves the valve cavity radioactive dirt automatic removing device to a position far away from the valve, after a maintenance worker grinds a valve seat sealing surface, the decontaminating worker moves the valve cavity radioactive dirt automatic removing device to a position close to the valve, a clean hairbrush is replaced, a scrubbing and decontaminating head is connected to a quick connector female connector c at the front end of a mechanical arm through a quick connector male connector b, an ultrasonic generator is started, the decontaminating worker performs the valve seat sealing surface automatic cleaning and decontaminating process on a remote centralized control console, and performs the valve cavity automatic water and dust absorption process in the step one again to clean metal particles on the surface of the valve seat sealing surface;
fourthly, the decontamination personnel monitors the decontamination condition on a remote centralized control console by using an irradiation-resistant camera at the front end of the mechanical arm, and if abnormity is found, emergency operation is carried out to stop decontamination work;
fifthly, for the condition that the internal structure of the valve cavity is complex or the automatic decontamination program is not thoroughly decontaminated, a decontamination worker controls the mechanical arm to carry out remote control decontamination on a remote centralized control console, and simultaneously observes the decontamination condition through an irradiation-resistant camera at the front end of the mechanical arm;
step six, in the valve cavity decontamination process, radioactive substances may be deposited in the pipelines and valves of the automatic valve cavity radioactive dirt removing device, and relevant pipelines and valves can be washed and decontaminated, and the specific method comprises the following steps:
opening the valve a and the valve b, closing the valve c and the valve d, connecting an external flushing pipeline with a quick connector male connector to a quick connector female connector a8, and flushing and decontaminating the pipeline a, the pipeline c, the filter, the fluid transfer pump and the valve a;
opening the valve b and the valve c, closing the valve a and the valve d, connecting an external flushing pipeline with a quick connector male connector to the quick connector female connector a, and flushing and decontaminating the pipeline a, the pipeline b and the valve c;
and opening the valve b and the valve d, closing the valve a and the valve c, connecting an external flushing pipeline with a quick connector male connector to the quick connector female connector a, and flushing and decontaminating the pipeline a and the valve d.
9. The method of claim 8, wherein the valve chamber is configured to automatically remove radioactive contamination, the method comprising: and step five, when automatic decontamination is difficult to execute due to limited space of the installation position of the valve and small size of the valve, a decontaminating person communicates the water absorption dust absorption decontamination head with the quick connector female connector by using a hose with two ends respectively provided with the quick connector male connector and the quick connector female connector, closes the valve b and the valve c, opens the valve a and the valve d, starts the fluid transmission pump, manually absorbs water, absorbs dust and decontaminates by holding the water absorption dust absorption decontamination head by hand, and manually scrubs the decontamination head by hand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229159.2A CN112366018A (en) | 2020-11-06 | 2020-11-06 | Automatic valve chamber radioactive dirt removing device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011229159.2A CN112366018A (en) | 2020-11-06 | 2020-11-06 | Automatic valve chamber radioactive dirt removing device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114155987A (en) * | 2021-11-27 | 2022-03-08 | 南华大学 | Method for decontaminating waste metals with radioactive nuclei |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114155987A (en) * | 2021-11-27 | 2022-03-08 | 南华大学 | Method for decontaminating waste metals with radioactive nuclei |
| CN114155987B (en) * | 2021-11-27 | 2024-04-19 | 南华大学 | Method for decontaminating radionuclides waste metals |
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