CN218725793U - Nuclear power station chimney aerosol and iodine sampling device - Google Patents
Nuclear power station chimney aerosol and iodine sampling device Download PDFInfo
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- CN218725793U CN218725793U CN202222411754.9U CN202222411754U CN218725793U CN 218725793 U CN218725793 U CN 218725793U CN 202222411754 U CN202222411754 U CN 202222411754U CN 218725793 U CN218725793 U CN 218725793U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application belongs to the technical field of radioactivity monitoring of gaseous effluents of nuclear power plants, and particularly relates to a nuclear power plant chimney aerosol and iodine sampling device; the device, comprising: a sampling line and a sampling box; the sampling box is connected with the tritium sampler in parallel in a first sampling loop through the sampling pipeline; the online instrument is connected in the second sampling loop; the first sampling loop and the second sampling loop are connected in parallel and are connected with a chimney pipeline of a nuclear power station, the new sampling device and the online monitoring instrument are mutually independent, the sample changing operation has no influence on the online instrument, the sample changing operation process is ensured not to influence the online instrument, and the risk of alarming of the online instrument and automatic counting of a unit into unplanned IO in the sample changing operation process is thoroughly eliminated.
Description
Technical Field
The application belongs to the technical field of radioactivity monitoring of gaseous effluents of nuclear power plants, and particularly relates to a nuclear power plant chimney aerosol and iodine sampling device.
Background
When the nuclear power unit is designed, a sampling pipeline is designed on a chimney, and an aerosol, iodine, tritium and carbon 14 continuous sampling device and an inert gas grabbing device are arranged on the sampling pipeline and used for sampling and monitoring various items of radioactive gaseous effluents of the unit so as to meet the requirements of relevant regulatory standards, environmental evaluation documents and supervision authorities on emission monitoring of the radioactive effluents of the operating unit of the nuclear power station.
A tritium and carbon 14 continuous sampling device and an inert gas grabbing device of a certain nuclear power station unit are arranged on an independent sampling pipeline, and sampling operation cannot affect an online monitoring instrument. The continuous sampling device for aerosol and iodine is arranged at the upstream of a sampling pipeline of an inert gas online monitoring instrument, the sampling device is required to be switched to a standby series during sampling, then the sampling is carried out after disassembly, the flow fluctuation of the online instrument cannot be avoided in the switching and disassembling processes of the sampling device, if the fluctuation exceeds the normal flow range (such as 20-45L/min) of the instrument, the instrument fault alarm can be caused, the set is caused to automatically count a group of unplanned IO, and the number of times of logging in the IO during the operation of the set is strictly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a nuclear power station chimney aerosol and iodine sampling device solves among the prior art sampling device and switches and dismantle the process and can not avoid causing online instrument flow fluctuation, easily leads to the problem that the unit is automatic to be taken into account a set of unplanned IO.
The technical scheme for realizing the purpose of the application is as follows:
the embodiment of the application provides a nuclear power station chimney aerosol and iodine sampling device, the device includes: a sampling line and a sampling box;
the sampling box is connected with the tritium sampler in parallel in a first sampling loop through the sampling pipeline; the online instrument is connected in the second sampling loop;
the first sampling loop and the second sampling loop are connected in parallel and are connected with a chimney pipeline of the nuclear power station.
Optionally, the apparatus further includes: a flow meter;
the flow meter is connected in series on the sampling line.
Optionally, the flowmeter is a direct-reading electronic mass flowmeter, and has a temperature and pressure correction function, and the displayed sampling flow is the sampling flow after temperature and pressure correction.
Optionally, the flow meter has functions of instantaneous flow and cumulative flow recording, and cumulative flow zero clearing, the instantaneous flow range is in the range of 1 to 80SLM/min, and the cumulative flow range is not lower than 5000SLM.
Optionally, the apparatus further includes: adjusting a valve;
the regulating valve is connected in series on the sampling pipeline and is used for regulating the sampling flow of the aerosol and the iodine to be constant.
Optionally, the apparatus further includes: a stop valve;
the stop valve is connected in series on the sampling pipeline.
Optionally, the number of the stop valves is two;
the two stop valves are respectively arranged on two sides of the sampling box.
Optionally, the apparatus further includes: a sampling pump;
the sampling pump is connected in series on the first sampling loop.
Optionally, the type of the sampling pump is the same as that of the sampling power pump of the online instrument.
The beneficial technical effect of this application lies in:
according to the device for sampling the chimney aerosol and the iodine in the nuclear power station, a new device for sampling the chimney aerosol and the iodine is designed on the basis of the original sampling pipeline arrangement, the new sampling device is mutually independent from an online monitoring instrument, sample changing operation has no influence on the online instrument, the online instrument is not influenced in the sample changing operation process, and the risks of alarming of the online instrument and automatic calculation of a unit into unplanned IO in the sample changing operation process are thoroughly eliminated; the new sampling device flowmeter has the functions of sampling flow temperature and pressure correction, and improves the accuracy of sampling monitoring results.
Drawings
Fig. 1 is a schematic structural diagram of a nuclear power plant chimney aerosol and iodine sampling device according to an embodiment of the present application.
In the figure:
1-a sampling line; 2-sampling box; 3-tritium sampler; 4-a first sampling loop; 5-a chimney pipeline; 6-a flow meter; 7-adjusting valve; 8-a stop valve; 9-sampling pump.
Detailed Description
In order to make the technical solutions in the embodiments of the present application more clearly understood and fully described below by those skilled in the art, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.
Referring to fig. 1, the figure is a schematic structural diagram of a nuclear power plant stack aerosol and iodine sampling device according to an embodiment of the present application.
The utility model provides a nuclear power station chimney aerosol and iodine sampling device includes: a sampling line 1 and a sampling box 2;
the sampling box 2 is connected in parallel with the tritium sampler 3 in a first sampling loop 4 through a sampling pipeline 1; the online instrument is connected in the second sampling loop;
the first sampling loop 4 and the second sampling loop are connected in parallel and are both connected with a chimney pipeline 5 of the nuclear power station.
In the embodiment of the application, on the basis of the original sampling pipeline arrangement, a new chimney aerosol and iodine sampling device is designed, the new sampling device and an online monitoring instrument are mutually independent, the sample changing operation has no influence on the online instrument, the sample changing operation process is ensured not to influence the online instrument, and the risks of online instrument alarm and unplanned IO automatic counting of a unit in the sample changing operation process are thoroughly eliminated.
In some possible implementation manners of the embodiment of the present application, the apparatus further includes: a flow meter 6;
the flow meter 6 is connected in series to the sampling line 1.
In one example, the flow meter 6 is a direct-reading electronic mass flow meter, and has a temperature and pressure correction function, and the displayed gas flow is the flow of the sampling pipeline 1 after temperature and pressure correction, so that the accuracy of a sampling monitoring result is improved.
In another example, the flowmeter 6 has the functions of instantaneous flow and accumulated flow recording, and accumulated flow zero clearing, the instantaneous flow range is not less than 1-80 SLM/min, and the accumulated flow range is not less than 5000SLM.
In some possible implementation manners of the embodiment of the present application, the apparatus further includes: an adjusting valve 7;
a regulating valve 7 is connected in series to the sampling line 1 for regulating the aerosol and iodine sampling flow to a constant sampling flow.
In some possible implementation manners of the embodiment of the present application, the apparatus further includes: a stop valve 8;
a shut-off valve 8 is connected in series on the sampling line 1.
In one example, the number of the stop valves 8 is two;
two stop valves 8 are respectively arranged at two sides of the sampling box 2.
In some possible implementation manners of the embodiment of the present application, the apparatus further includes: a sampling pump 9;
the sampling pump 9 is connected in series to the first sampling circuit 4.
In practical application, the type of the sampling pump 9 can be consistent with that of an on-line instrument sampling power pump, so that the reliability and the stability of continuous sampling power of a newly-added sampling device are ensured.
During specific implementation, the materials of the valve and the pipeline are consistent with those of the original system, so that the increase of the external leakage rate of the gas pipeline caused by electrostatic corrosion due to different materials is prevented.
The following describes a specific method for using the nuclear power plant stack aerosol and the iodine sampling device provided by the embodiment of the application in detail with reference to a specific example.
The original sampling device of the system is no longer used as a sampling device for chimney aerosol and iodine samples, and the new sampling device for aerosol and iodine is used as a continuous sampling device for chimney gaseous effluent aerosol and iodine.
1) Device state description during sequential sampling
During continuous sampling, activated carbon filter paper and aerosol filter paper are sequentially placed in a sampling box 2 of the sampling device, the aerosol filter paper is close to an air inlet, a stop valve 8 is opened, a sampling pump 9 is opened, and the sampling flow of aerosol and iodine is adjusted to be constant by an adjusting valve 7 and then continuous sampling is kept.
2) Description of sample Change operation
When the chimney aerosol and iodine samples are exchanged, the sampling pump 9 is closed, the stop valve 8 is closed, the state of the regulating valve 7 is unchanged, the accumulated flow of the flowmeter 6 is recorded, the sampling box 2 is opened to replace aerosol filter paper and activated carbon filter paper, the exchange of the chimney aerosol and iodine samples is completed, and the exchanged filter paper samples are sent to a laboratory for analysis.
The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.
Claims (9)
1. A nuclear power plant chimney aerosol and iodine sampling apparatus, the apparatus comprising: a sampling line and a sampling box;
the sampling box is connected with the tritium sampler in parallel in a first sampling loop through the sampling pipeline; the online instrument is connected in the second sampling loop;
the first sampling loop and the second sampling loop are connected in parallel and are connected with a chimney pipeline of the nuclear power station.
2. The nuclear power plant chimney aerosol and iodine sampling device of claim 1, further comprising: a flow meter;
the flowmeter is connected in series on the sampling pipeline.
3. The nuclear power plant chimney aerosol and iodine sampling device according to claim 2, wherein the flow meter is a direct-reading electronic mass flow meter having temperature and pressure correction functions, and the displayed sampling flow is a temperature and pressure corrected sampling flow.
4. The nuclear power plant chimney aerosol and iodine sampling device according to claim 3, wherein the flow meter has instantaneous flow and cumulative flow recording, cumulative flow zero clearing functions, instantaneous flow range is in the range of 1-80 SLM/min, cumulative flow range is not lower than 5000SLM.
5. The nuclear power plant chimney aerosol and iodine sampling device of claim 1, further comprising: adjusting a valve;
the regulating valve is connected in series on the sampling pipeline and is used for regulating the sampling flow of the aerosol and the iodine to be constant.
6. The nuclear power plant chimney aerosol and iodine sampling device of claim 1, further comprising: a stop valve;
the stop valve is connected in series on the sampling pipeline.
7. The nuclear power plant chimney aerosol and iodine sampling device of claim 6, wherein there are two said shut-off valves;
two stop valves set up respectively in the both sides of sampling box.
8. The nuclear power plant chimney aerosol and iodine sampling apparatus of any one of claims 1-7, further comprising: a sampling pump;
the sampling pump is connected in series on the first sampling loop.
9. The nuclear power plant chimney aerosol and iodine sampling apparatus of claim 8, wherein the sampling pump is of a type consistent with an on-line instrument sampling power pump type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222411754.9U CN218725793U (en) | 2022-09-08 | 2022-09-08 | Nuclear power station chimney aerosol and iodine sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222411754.9U CN218725793U (en) | 2022-09-08 | 2022-09-08 | Nuclear power station chimney aerosol and iodine sampling device |
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| Publication Number | Publication Date |
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| CN218725793U true CN218725793U (en) | 2023-03-24 |
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| CN202222411754.9U Active CN218725793U (en) | 2022-09-08 | 2022-09-08 | Nuclear power station chimney aerosol and iodine sampling device |
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