CN108397574B - Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve - Google Patents
Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve Download PDFInfo
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- CN108397574B CN108397574B CN201810181176.XA CN201810181176A CN108397574B CN 108397574 B CN108397574 B CN 108397574B CN 201810181176 A CN201810181176 A CN 201810181176A CN 108397574 B CN108397574 B CN 108397574B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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Abstract
The invention relates to an anti-contamination isolation valve of a nuclear power plant measuring standard device, which is arranged between the measuring standard device and a pressure instrument to be calibrated and comprises a cavity, a first valve, a second valve, a pressure relief opening and a third valve, wherein one end of the first valve is connected with the cavity, the other end of the first valve is connected with the measuring standard device, the second valve is arranged between the cavity and the pressure instrument to be calibrated and is respectively connected with the cavity and the pressure instrument to be calibrated, the pressure relief opening is communicated with the cavity, the third valve is arranged between the cavity and the pressure relief opening, the third valve is arranged between the cavity and the pressure instrument to be calibrated and is arranged between the measuring, thus avoiding the direct contact of the measuring standard device and the pressure instrument to be calibrated, discharging the calibration medium through the pressure relief port, avoiding the contamination caused by the medium passing through the cavity of the standard device during the pressure relief, meanwhile, the proper collection and treatment of the calibration medium are facilitated, and the contamination risk of personnel and a calibration test bed is avoided.
Description
Technical Field
The invention relates to an isolation valve, in particular to an anti-contamination isolation valve of a nuclear power plant metering standard device and a using method thereof.
Background
Nuclear power plants are power plants that utilize the energy released by nuclear fission or fusion reactions to produce electrical energy. Nuclear power plants in commercial operation today utilize nuclear fission reactions to generate electricity. Nuclear power plants are generally divided into two parts: nuclear islands (including reactor plants and primary loop systems) that produce steam using nuclear fission and conventional islands (including turbogenerator systems) that generate electricity using steam.
The radiation sources in the control area of the nuclear power plant are mainly radionuclides and corrosion activation products brought out of the reactor by the primary coolant. The online monitoring instrument and the measuring instrument for testing used in the control area have the risk of radioactive contamination. When the measuring instruments in the control area need magnitude transmission, firstly, the radiation protection detection is needed, and if part of instruments are not contaminated, the instruments are transported out of the control area and sent to a measuring unit for calibration; and the other part of the instruments detects that the instruments are polluted and cannot be effectively decontaminated, or pressure guiding pipes and the like in the instruments cannot be detected, so that the instruments are not allowed to be transported out of a control area and cannot be subjected to quantity value tracing. With the increase of nuclear power operation units, instruments which are scrapped due to incapability of calibration gradually increase every year, so that the cost of a power plant rises, and a large number of scrapped instruments with radioactivity are accumulated. The tracing of the magnitude of the contaminated instrument is an urgent requirement of each nuclear power station.
For contaminated meters, the prior art method sets up a verification laboratory in the control area, brings external calibration standards into the control area, and calibrates the contaminated meter. However, when calibrating the pressure instrument, the following difficulties still exist: surface pollution exists on part of instruments, and the joint of the standard device and the calibrated instrument has the pollution risk in the equipment calibration and connection process; loose radioactive particles may exist in the internal cavity of part of the instrument and may flow along with the calibration medium, when the calibration medium is water, the excess pressure of the pipeline after calibration is discharged and can only be emptied by the adapter for disassembly and connection, and because a certain pressure exists in the pipeline, water overflows from the adapter, the calibration medium cannot be properly collected, and the risk of contamination of a calibration test bed and personnel exists; if the calibration medium is gas, during return calibration and pressure relief, the calibration medium needs to be discharged from the connecting pipe to the outside through the cavity of the standard device, so that the risk of contamination of the inside of the standard device and personnel exists.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a nuclear power plant metering standard contamination-proof isolation valve.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a nuclear power plant's measurement standard ware anti-staining isolation valve, it installs between measurement standard ware and by the school pressure instrument, including cavity, one end with the cavity be connected the other end with the first valve that measurement standard ware is connected, install the cavity with by between the school pressure instrument and rather than the second valve that is connected respectively, with the pressure release mouth that the cavity is linked together, install the cavity with third valve between the pressure release mouth and with the minute-pressure governing valve that the cavity is connected.
Preferably, the third valve and the pressure relief opening are integrally formed.
The invention further aims to provide a using method of the anti-contamination isolation valve of the nuclear power plant metering standard device, which comprises the following steps:
(a) connecting the cavity to the metrological standard and the pressure gauge being calibrated respectively by way of a pressure lead tube such that the first valve is located between the cavity and the metrological standard and the second valve is located between the cavity and the pressure gauge being calibrated;
(b) closing the first valve, starting the metering standard device to make pressure, and checking the air tightness between the metering standard device and the first valve through the pressure maintaining condition;
(c) discharging sewage from the calibrated pressure instrument;
(d) opening the first valve and the second valve, closing the third valve, pressurizing the metering standard device from a zero point to a first calibration point, tapping a pressure gauge after the pressure is stable, and reading a indicating value error; continuously pressurizing to other selected calibration points for calibration until the upper limit of the measurement is reached;
(e) the third valve and the micro-pressure regulating valve are used for reducing the pressure, so that the indication value of the metering standard device is reduced from the upper measurement limit to each calibration point in sequence for calibration;
(f) and evacuating pressure through the pressure relief port, and collecting the calibration medium.
Further, in the step (c), the discharging the sewage of the calibrated pressure meter specifically comprises: closing the third valve, opening the first valve and the second valve, and using the metering standard device to make pressure; and then closing the first valve, opening the third valve, closing the second valve, opening the first valve and opening the second valve in sequence.
Further, in the step (c), the calibration medium and the discharged contaminants are collected.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the anti-contamination isolation valve for the nuclear power plant measuring standard is arranged between the measuring standard and the pressure instrument to be calibrated and adopts a specific structure, so that the measuring standard is prevented from being directly contacted with the pressure instrument to be calibrated, a calibration medium can be discharged through a pressure relief opening, contamination caused by the fact that the medium passes through a standard cavity during pressure relief is avoided, proper collection and treatment of the calibration medium are facilitated, and contamination risks of personnel and a calibration test bed are avoided.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant metrological standard contamination isolation valve of the present invention;
wherein, 1, a contamination-proof isolation valve; 2. a measurement standard; 3. a calibrated pressure meter; 11. a cavity; 12. a first valve; 13. a second valve; 14. a third valve; 15. a micro-pressure regulating valve; 16. a pressure relief port.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The nuclear power plant measurement standard device anti-contamination isolation valve 1 shown in fig. 1 is installed between a measurement standard device 2 and a pressure instrument 3 to be calibrated, and mainly comprises a cavity 11, a first valve 12, a second valve 13, a third valve 14 and the like.
Wherein, the first valve 12 is connected with the cavity 11 and is also connected with the measuring standard device 2, namely, one end of the cavity 11 is connected with the measuring standard device 2 through the first valve 12; the second valve 13 is arranged between the chamber 11 and the pressure meter 3 to be calibrated and connected with them, i.e. the other end of the chamber 11 is connected with the pressure meter 3 to be calibrated through the second valve 13. The cavity 11 is also connected with a pressure relief port 16, so that the calibration medium can be discharged through the pressure relief port 16, and a third valve 14 is arranged between the cavity 11 and the pressure relief port 16; the pressure relief opening 16 may be in the form of a medium conduit or the like, which is typically provided with a third valve 14 (i.e. the third valve 14 and the pressure relief opening 16 are integrally arranged). The micro-pressure regulating valve 15 is directly connected with the cavity 11, so that when the pressure return indication value is verified, the micro-pressure regulating valve 15 is used for fine adjustment of pressure, the pressure of a pipeline at the end of the measuring standard device 2 is always larger than or equal to the pressure at the end of the pressure instrument 3 to be verified, and the possibility that loose radioactive particles flow to the measuring standard device 2 is reduced. The connection of the above components can be realized by adopting a conventional pipeline (such as a pressure guiding pipe).
The use method of the anti-contamination isolation valve 1 of the nuclear power plant metering standard comprises the following steps:
(a) on a stable calibration stand, the cavity 11 is respectively connected with the measuring standard device 2 and the pressure instrument 3 to be calibrated through pressure leading pipes, so that the first valve 12 is positioned between the cavity 11 and the measuring standard device 2, and the second valve 13 is positioned between the cavity 11 and the pressure instrument 3 to be calibrated (note that the two ends cannot be used in a mixed way, so as to avoid the appearance of the measuring standard device 2 being stained); enabling the first valve 12, the second valve 13 and the third valve 14 to be in an open state, enabling the pressure instrument 3 to be calibrated to be communicated with the atmosphere, observing by eyes, and reading zero offset of a pressure gauge; in the present embodiment, the metrological standard 2 is a DPI610 electronic manometer;
(b) closing the first valve 12, starting the metering standard 2 (namely, a DPI610 electronic pressure gauge) to perform pressure generation, and checking the air tightness between the metering standard 2 and the first valve 12 (namely, the connection end of the metering standard 2) through the pressure maintaining condition of the metering standard 2; the pollution caused by the fact that the medium flows out from the port of the metering standard 2 during calibration due to air leakage of the connecting end of the metering standard 2 is prevented;
(c) and (3) discharging sewage to the calibrated pressure instrument 3: closing the third valve 14, opening the first valve 12 and the second valve 13, and making pressure by using the metering standard device 2; subsequently closing the first valve 12, opening the third valve 14, closing the second valve 13, opening the first valve 12 and opening the second valve 13 in sequence, so that the pressure of the metrological standard 2 and the pressure gauge 3 being calibrated (in fact between the metrological standard 2 and the first valve 12, between the pressure gauge 3 being calibrated and the second valve 13) is discharged and the calibration medium and the discharged contaminants are collected;
(d) and (3) calibrating a positive travel indication error: opening the first valve 12 and the second valve 13, closing the third valve 14, pressurizing the metering standard device 2 from the zero point to a first calibration point (a certain indicating value of the metering standard device 2), tapping the pressure gauge after the pressure is stabilized, and reading an indicating value error; continuously pressurizing to the selected first calibration point, tapping the pressure gauge after the pressure is stable, and reading the indication error; repeating the above steps until the pressure is increased to the upper measuring limit of the metering standard 2; if the calibration is carried out, the first valve 12 and the second valve 13 can be closed to judge the leakage point under the condition that the pressure can not be maintained, so that the pollution of a calibration table caused by the fact that leakage detection liquid cannot be properly collected in a control area is avoided;
(e) calibrating the reverse stroke indicating value error: sequentially reducing the pressure of the metering standard device 2 from the upper measuring limit to each calibration point for calibration until reaching the zero point; at this time, the pressure is reduced through the third valve 14; when the pressure is reduced to be close to the calibration point, the third valve 14 is closed, and the pressure in the pipeline is reduced through the micro-pressure regulating valve 15 so as to enable the pressure to reach the set calibration point; similarly, if the pressure is lower than the calibration point, the DPI610 is used for pressurizing, and then the micro-pressure regulating valve 15 is used for slowly reducing the pressure to the calibration point;
(f) the pressure is vented through the pressure relief port 16 and the calibration medium is collected: when the pressure of the pipeline is exhausted, the first valve 12 is closed, the third valve 14 is opened, and then the pressure of the calibrated end (namely between the calibrated pressure meter 3 and the second valve 13) is exhausted; the first valve 12 is then opened and the pressure at the end of the metrological standard 2 (i.e. between the metrological standard 2 and the first valve 12) is vented. When the calibration medium is water, the calibration medium can be directly connected with a corresponding container at the pressure relief opening 16 for collection; if the calibration medium is air, the calibration medium can be connected into a container containing water through a pressure-leading pipe at the pressure-relief opening 16, so that the air in the cavity is prevented from being directly exhausted to the outside. After the calibration is finished, the collected calibration medium is properly treated according to the radiation protection regulations.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. The use method of the nuclear power plant measuring standard device anti-contamination isolation valve is characterized in that the nuclear power plant measuring standard device anti-contamination isolation valve is installed between a measuring standard device and a pressure instrument to be calibrated and comprises a cavity, a first valve, a second valve, a pressure relief opening, a third valve and a micro-pressure regulating valve, wherein one end of the first valve is connected with the cavity, the other end of the first valve is connected with the measuring standard device, the second valve is installed between the cavity and the pressure instrument to be calibrated and is respectively connected with the cavity and the pressure instrument to be calibrated, the pressure relief opening is communicated with the cavity, the third valve is installed between the cavity and the pressure relief opening, and the micro-pressure regulating;
the use method of the anti-contamination isolation valve of the nuclear power plant metering standard comprises the following steps:
(a) connecting the cavity to the metrological standard and the pressure gauge being calibrated respectively by way of a pressure lead tube such that the first valve is located between the cavity and the metrological standard and the second valve is located between the cavity and the pressure gauge being calibrated;
(b) closing the first valve, starting the metering standard device to make pressure, and checking the air tightness between the metering standard device and the first valve through the pressure maintaining condition;
(c) discharging sewage from the calibrated pressure instrument;
(d) opening the first valve and the second valve, closing the third valve, pressurizing the metering standard device from a zero point to a first calibration point, tapping a pressure gauge after the pressure is stable, and reading a indicating value error; continuously pressurizing to other selected calibration points for calibration until the upper limit of the measurement is reached;
(e) the third valve and the micro-pressure regulating valve are used for reducing the pressure, so that the indication value of the metering standard device is reduced from the upper measurement limit to each calibration point in sequence for calibration;
(f) and evacuating pressure through the pressure relief port, and collecting the calibration medium.
2. The method of using a nuclear power plant measurement standard contamination isolation valve of claim 1, wherein in step (c), the blowdown of the calibrated pressure instrument is specifically: closing the third valve, opening the first valve and the second valve, and using the metering standard device to make pressure; and then closing the first valve, opening the third valve, closing the second valve, opening the first valve and opening the second valve in sequence.
3. The method of using a nuclear power plant metrological standard contamination isolation valve as claimed in claim 2, characterized in that: in step (c), the calibration medium and the discharged contaminants are collected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181176.XA CN108397574B (en) | 2018-03-06 | 2018-03-06 | Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181176.XA CN108397574B (en) | 2018-03-06 | 2018-03-06 | Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve |
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| CN108397574A CN108397574A (en) | 2018-08-14 |
| CN108397574B true CN108397574B (en) | 2020-01-03 |
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| CN201810181176.XA Active CN108397574B (en) | 2018-03-06 | 2018-03-06 | Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve |
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| CN110487315B (en) * | 2019-08-28 | 2021-09-28 | 广东核电合营有限公司 | System and method for analyzing instrument drift |
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| JPH11218297A (en) * | 1997-11-14 | 1999-08-10 | Air Prod And Chem Inc | Gas control device and gas supplying method |
| CN101419098A (en) * | 2008-12-09 | 2009-04-29 | 大连工业大学 | Intelligent temperature isolation transmitter |
| CN203616052U (en) * | 2013-12-19 | 2014-05-28 | 珠海格力电器股份有限公司 | A pressure gauge calibrating device |
| CN205347465U (en) * | 2016-02-02 | 2016-06-29 | 四川德胜集团钒钛有限公司 | TRT exhaust pipe |
| CN206095519U (en) * | 2016-10-13 | 2017-04-12 | 广西防城港核电有限公司 | Pressure transmitter on -line maintenance system |
| CN206920077U (en) * | 2017-04-27 | 2018-01-23 | 中国核工业第五建设有限公司 | Pressure meter calibration servicing unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090025823A (en) * | 2007-09-07 | 2009-03-11 | 한국표준과학연구원 | A calibration/test apparatus and method for vacuum gauges without movement |
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- 2018-03-06 CN CN201810181176.XA patent/CN108397574B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11218297A (en) * | 1997-11-14 | 1999-08-10 | Air Prod And Chem Inc | Gas control device and gas supplying method |
| CN101419098A (en) * | 2008-12-09 | 2009-04-29 | 大连工业大学 | Intelligent temperature isolation transmitter |
| CN203616052U (en) * | 2013-12-19 | 2014-05-28 | 珠海格力电器股份有限公司 | A pressure gauge calibrating device |
| CN205347465U (en) * | 2016-02-02 | 2016-06-29 | 四川德胜集团钒钛有限公司 | TRT exhaust pipe |
| CN206095519U (en) * | 2016-10-13 | 2017-04-12 | 广西防城港核电有限公司 | Pressure transmitter on -line maintenance system |
| CN206920077U (en) * | 2017-04-27 | 2018-01-23 | 中国核工业第五建设有限公司 | Pressure meter calibration servicing unit |
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