CN108053903B - Device for measuring retention factor of cracking product in high-temperature sodium - Google Patents
Device for measuring retention factor of cracking product in high-temperature sodium Download PDFInfo
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- CN108053903B CN108053903B CN201711390783.9A CN201711390783A CN108053903B CN 108053903 B CN108053903 B CN 108053903B CN 201711390783 A CN201711390783 A CN 201711390783A CN 108053903 B CN108053903 B CN 108053903B
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 90
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 90
- 239000011734 sodium Substances 0.000 title claims abstract description 90
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 24
- 238000005336 cracking Methods 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 135
- 230000004992 fission Effects 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims 8
- 239000000941 radioactive substance Substances 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 2
- 230000006399 behavior Effects 0.000 description 9
- 238000013508 migration Methods 0.000 description 9
- 230000005012 migration Effects 0.000 description 9
- 239000003814 drug Substances 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Measurement Of Radiation (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the technical field of nuclear safety evaluation, and relates to a device for measuring retention factors of a fission product in high-temperature sodium. The measuring device comprises a heating container, a pressure-driven releasing device, a heating system, a sodium inlet pipe, a sodium outlet pipe and a sampling port, wherein the pressure-driven releasing device is arranged at the lower part of the inside of the heating container, and standard weighing chemicals are pre-filled in the pressure-driven releasing device and are used for simulating the physical process of suddenly releasing fission products into sodium; the heating system is used for heating the heating container so as to maintain the temperature inside the heating container within a temperature range required by the test; the sodium inlet pipe and the sodium outlet pipe are connected with the heating container and are respectively used for adding sodium into the heating container and discharging sodium in the heating container; the sampling port is connected to the side wall of the heating container. By using the measuring device provided by the invention, the behavior of radioactive substances released from sodium to the top air cavity of the sodium-cooled fast reactor under the severe accident working condition can be effectively simulated and researched.
Description
Technical Field
The invention belongs to the technical field of nuclear safety evaluation, and relates to a device for measuring retention factors of a fission product in high-temperature sodium.
Background
In a pool type sodium-cooled fast neutron reactor, research on migration behaviors of fission products in the reactor under severe accident working conditions has very important significance on correction of a fission product in-reactor migration model and a calculation method in theoretical calculation, and meanwhile, reliable basis and data support can be provided for subsequent design of serious accident prevention.
In order to fully develop the work of source analysis technology and the like of radioactive substance release under serious accidents, the migration behavior of fissile nuclides generated after fuel breakage from high-temperature sodium to a top gas cavity of a reactor is required to be researched, and therefore, a set of device for measuring the retention factor of the fissile products in the high-temperature sodium is required to be designed and developed. The device is intended to be able to simulate the migration behaviour of solid and gaseous fission products due to sodium evaporation and transient cavitation during severe accidents.
Disclosure of Invention
The invention aims to provide a device for measuring retention factors of fission products in high-temperature sodium, which can be used for effectively simulating and researching the behavior of radioactive substances released from sodium to a top air cavity of a sodium-cooled fast reactor under severe accident working conditions.
To achieve the object, in a basic embodiment, the invention provides a device for measuring retention factor of a cracking product in high-temperature sodium, which comprises a heating container, a pressure-driven release device, a heating system, a sodium inlet pipe, a sodium outlet pipe and a sampling port,
The pressure-driven release device is arranged at the lower part of the interior of the heating container, is internally provided with standard weighing chemicals in advance, is connected with argon outside the heating container through a movable joint and is used for simulating the physical process of suddenly releasing fission products into sodium;
the heating system is used for heating the heating container so as to maintain the temperature inside the heating container within a temperature range required by the test;
the sodium inlet pipe and the sodium outlet pipe are connected with the heating container and are respectively used for adding sodium into the heating container and discharging sodium from the heating container;
The sampling port is connected to the side wall of the heating container.
The heating container is a vertical closed container, is provided with an electric heating and heat preserving device, and can control the sodium temperature in the heating container through an electric heating control system.
In a preferred embodiment, the invention provides a device for measuring the retention factor of a crack product in high-temperature sodium, wherein the heating system comprises a heating rod and/or a heating wire,
The heating rod is inserted into the heating container from the top of the heating container;
the heating wire is adhered to the side wall of the heating container.
The heating rod and the heating wire can jointly realize rapid heating of sodium in the heating container, and maintain the temperature in the heating container within a range required by a test.
In a preferred embodiment, the present invention provides a device for measuring the retention factor of a fission product in high temperature sodium, wherein said device further comprises a filter element connected between said sampling port and said heating vessel for capturing and collecting non-volatile nuclides in the sample gas.
In a more preferred embodiment, the invention provides a device for measuring the retention factor of a cracking product in high-temperature sodium, wherein the filter element comprises a primary filter element, a secondary filter element and a flange which are connected in sequence,
The primary filter element and the secondary filter element are respectively used for primary filtering and secondary filtering of sample gas;
The flange is used for connecting the heating container.
In a preferred embodiment, the present invention provides a device for measuring the retention factor of a split product in high temperature sodium, wherein said device further comprises a thermocouple inserted into the interior of said heating vessel from the top of said heating vessel for measuring the temperature distribution of sodium and blanket argon within said heating vessel.
In a preferred embodiment, the present invention provides a device for measuring the retention factor of a crack product in sodium at high temperature, wherein said measuring device further comprises a sodium level gauge inserted into the interior of said heating vessel from the top of said heating vessel for measuring the level of sodium in said heating vessel.
In a preferred embodiment, the present invention provides a device for measuring the retention factor of a crack product in high temperature sodium, wherein said device further comprises an operating orifice connected to said heating vessel above said pressure-driven release means for placing and connecting said pressure-driven release means in said heating vessel.
In a more preferred embodiment, the present invention provides a device for measuring the retention factor of a crack product in high temperature sodium, wherein the device further comprises a baffle ring arranged on the inner wall of the heating vessel below the operation hole for defining the position of the pressure driven release device and its connection pipe.
The pressure-driven release device can be connected with the air pipeline in the heating container through a hose by utilizing the operation hole, and is placed on the baffle plate along the baffle ring.
In a preferred embodiment, the invention provides a device for measuring the retention factor of a cracking product in high-temperature sodium, wherein the device further comprises a connecting pipe support which is arranged at the inner bottom of the heating container and welded to the inner wall of the heating container through a supporting plate, and is used for supporting and fixing the pressure driving release device.
In a preferred embodiment, the invention provides a device for measuring the retention factor of a cracking product in high-temperature sodium, wherein the device further comprises a steam trap connected with the heating container from the top for capturing sodium steam, preventing the sodium steam from condensing in the charging and discharging pipelines and blocking the pipelines.
The device for measuring the retention factor of the cracking product in the high-temperature sodium has the beneficial effects that the behavior of releasing radioactive substances from sodium to the top air cavity of the sodium-cooled fast reactor under the severe accident working condition can be effectively simulated and studied by using the device for measuring the retention factor of the cracking product in the high-temperature sodium.
The device for measuring the retention factor of the fission product in the high-temperature sodium can simulate the migration behavior of the fission product from the sodium to the top gas cavity caused by steady state sodium evaporation and transient cavitation effect when the fuel element is damaged in a closed environment. The operation hole arranged on the side surface of the heating container in the measuring device can facilitate the operation of the pressure-driven releasing device, and particularly when the transient cavitation effect is simulated, the pressure-driven releasing device can be opened in a mode of air source transient pressurization so as to release the added medicine into the heated sodium. In addition, the secondary filter element can effectively filter and collect medicines contained in the sample gas, so that subsequent sample chemical analysis is facilitated.
Drawings
FIG. 1 is a block diagram illustrating the constitution of an apparatus for measuring a retention factor of a crack product in high-temperature sodium according to the present invention.
Fig. 2 is an axial cross-sectional view of the secondary filter element of fig. 1.
Detailed Description
The exemplary high temperature sodium medium-splitting product retention factor measuring device of the invention has a composition structure shown in fig. 1, and comprises a heating container 1, a sodium inlet pipe 2, a pressure driving releasing device 3, a sampling port 4, a secondary filtering element 5, a heating system, a multi-point thermocouple 7, a sodium liquid level meter 8, an operation hole 9, a baffle ring 10, a connecting pipe support 11, a sodium discharge pipe 13 and a steam trap 14.
The heating container 1 is a vertical closed container, which is provided with an electric heating and heat preserving device, and the sodium temperature inside the heating container 1 can be controlled by an electric heating control system.
The pressure-driven release device 3 is arranged at the lower part of the interior of the heating container 1, is internally provided with standard weighing chemicals in advance, and is connected with argon outside the heating container 1 through a movable joint, so as to simulate the physical process of suddenly releasing fission products into sodium.
The heating system includes a heating wire 6 and a heating rod 12, wherein the heating wire 6 is adhered to a side wall of the heating container 1, and the heating rod 12 is inserted into the inside of the heating container 1 from the top of the heating container 1. The rapid heating of sodium in the heating vessel 1 is achieved by the heater wire 6 together with the heater rod 12 and the temperature inside the heating vessel 1 is maintained within the range required for the test.
The sodium inlet pipe 2 and the sodium outlet pipe 13 are connected with the heating container 1 and are respectively used for adding sodium into the heating container 1 and discharging sodium in the heating container 1;
The sampling port 4 is connected to the side wall of the heating vessel 1. A secondary filter element 5 is connected between the sampling port 4 and the heating vessel 1 for capturing and collecting non-volatile species in the sample gas. As shown in fig. 2, the secondary filter element 5 includes a primary filter element 51, a secondary filter element 52, a left flange piece 53, a gasket 54, and a right flange piece 55, which are connected in this order. The primary filter element 51 and the secondary filter element 52 are used for primary filtering and secondary filtering of the sample gas, respectively. The left flange piece 53 and the right flange piece 55 form a detachable flange for connecting the heating container 1.
A multipoint thermocouple 7 is inserted into the interior of the heating vessel 1 from the top of the heating vessel 1 for measuring the temperature distribution of sodium and blanket argon inside the heating vessel 1.
A sodium level gauge 8 is inserted into the interior of the heating vessel 1 from the top of the heating vessel 1 for measuring the level of sodium inside the heating vessel 1.
The operation hole 9 is connected to the heating container 1 above the pressure-driven release device 3 for placing and connecting the pressure-driven release device 3 in the heating container 1. A stop ring 10 is provided on the inner wall of the heating vessel 1 below the operating aperture 9 for defining the position of the pressure-driven release means 3 and its connection hose. The pressure-driven release device 3 can be connected with the air line in the heating vessel 1 by means of a hose by means of an operating hole 9 and the pressure-driven release device 3 can be placed on the baffle along the baffle ring 10.
The adapter support 11 is disposed at the inner bottom of the heating container 1 and welded to the inner wall of the heating container 1 by a pallet for supporting and fixing the pressure driving releasing device 3.
The steam trap 14 is connected with the heating container 1 from the top and is used for trapping sodium steam, preventing the sodium steam from condensing in the charging and discharging pipelines and blocking the pipelines.
The above-described exemplary high temperature sodium in-process fission product retention factor measuring device of the present invention operates as follows.
In simulating the migration behaviour of fissile nuclides caused by steady state sodium evaporation, a standard weighed drug is first placed in the heating vessel 1, and the gaseous components inside the heating vessel 1 are replaced with an argon atmosphere. The nuclear grade sodium is then melted by heating and drained into heating vessel 1. The sodium is heated to 400-600 ℃ by a heating device, the temperature distribution of the sodium and the cover argon in the heating container 1 is measured by a multipoint thermocouple 7, and after the temperature distribution is stabilized, the cover argon above the sodium pool is sampled and analyzed by a secondary filter element 5 and a sampling port 4.
In simulating the migration behaviour of fissile nuclides caused by the transient cavitation effect, a standard weighed drug is first placed in the pressure-driven release means 3, and the pressure-driven release means 3 is placed and secured on the take-over support 11 along the inner wall baffle ring 10 by heating the operating aperture 9 in the side of the container 1. The nuclear grade sodium is then melted by heating and drained into heating vessel 1. The temperature distribution of sodium and blanket argon in the heating vessel 1 was measured by a multipoint thermocouple 7 using a heating device to heat the sodium to 400-600 ℃. After stabilization, the air source is pressurized to 1.2MPa, the relevant valve of the control pressure driving release device 3 is opened, the transient air pressure is utilized to open the pressure driving release device 3, the medicine in the medicine is released into sodium, and the sampling analysis is carried out on the covering argon above the sodium pool through the secondary filter element 5 and the sampling port 4.
The device can smoothly simulate the migration behavior of the fission product in the high-temperature sodium and measure the relevant retention factors, has very important significance for correcting the migration model and the calculation method in the fission product pile in theoretical calculation, and simultaneously provides reliable basis and data support for the design of serious accident prevention of the subsequent sodium-cooled fast reactor.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof. The foregoing examples or embodiments are merely illustrative of the invention, which may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims are intended to be encompassed within the scope of the invention.
Claims (10)
1. A device for measuring retention factor of a cracking product in high-temperature sodium is characterized by comprising a heating container, a pressure driving and releasing device, a heating system, a sodium inlet pipe, a sodium discharge pipe and a sampling port,
The pressure-driven release device is arranged at the lower part of the interior of the heating container, and standard weighing chemicals are pre-filled in the heating container and are used for simulating the physical process of suddenly releasing fission products into sodium;
the heating system is used for heating the heating container so as to maintain the temperature inside the heating container within a temperature range required by the test;
the sodium inlet pipe and the sodium outlet pipe are connected with the heating container and are respectively used for adding sodium into the heating container and discharging sodium from the heating container;
The sampling port is connected to the side wall of the heating container.
2. The measurement device of claim 1, wherein: the heating system comprises a heating rod and/or a heating wire,
The heating rod is inserted into the heating container from the top of the heating container;
the heating wire is adhered to the side wall of the heating container.
3. The measurement device of claim 1, wherein: the measuring device also comprises a filter element which is connected between the sampling port and the heating container and is used for capturing and collecting non-volatile nuclides in the sample gas.
4. A measuring device according to claim 3, characterized in that: the filter element comprises a primary filter element, a secondary filter element and a flange which are connected in sequence,
The primary filter element and the secondary filter element are respectively used for primary filtering and secondary filtering of sample gas;
The flange is used for connecting the heating container.
5. The measurement device of claim 1, wherein: the measuring device also comprises a thermocouple which is inserted into the heating container from the top of the heating container and is used for measuring the temperature distribution of sodium and covered argon in the heating container.
6. The measurement device of claim 1, wherein: the measuring device also comprises a sodium liquid level meter which is inserted into the heating container from the top of the heating container and is used for measuring the liquid level of sodium in the heating container.
7. The measurement device of claim 1, wherein: the measuring device further comprises an operating hole connected to the heating container above the pressure-driven release device for placing and connecting the pressure-driven release device in the heating container.
8. The measurement device of claim 7, wherein: the measuring device also comprises a baffle ring which is arranged on the inner wall of the heating container below the operation hole and used for limiting the position of the pressure driving releasing device and the connecting pipe thereof.
9. The measurement device of claim 1, wherein: the measuring device also comprises a connecting pipe support which is arranged at the inner bottom of the heating container and welded on the inner wall of the heating container through a supporting plate, and the connecting pipe support is used for supporting and fixing the pressure driving release device.
10. The measurement device of claim 1, wherein: the measuring device also comprises a steam trap, wherein the steam trap is connected with the heating container from the top and is used for trapping sodium steam and preventing the sodium steam from condensing in the air charging and discharging pipelines and blocking the pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390783.9A CN108053903B (en) | 2017-12-21 | 2017-12-21 | Device for measuring retention factor of cracking product in high-temperature sodium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390783.9A CN108053903B (en) | 2017-12-21 | 2017-12-21 | Device for measuring retention factor of cracking product in high-temperature sodium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108053903A CN108053903A (en) | 2018-05-18 |
| CN108053903B true CN108053903B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711390783.9A Active CN108053903B (en) | 2017-12-21 | 2017-12-21 | Device for measuring retention factor of cracking product in high-temperature sodium |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111540491B (en) * | 2020-05-14 | 2022-04-01 | 中国核动力研究设计院 | Rod-shaped fuel source item release characteristic research experimental device and using method thereof |
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2017
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| CN108053903A (en) | 2018-05-18 |
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