CN107340218B - Test system for researching downstream effect in CPR1000 pit filter screen pile - Google Patents
Test system for researching downstream effect in CPR1000 pit filter screen pile Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 88
- 230000000694 effects Effects 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000012634 fragment Substances 0.000 claims abstract description 48
- 239000000446 fuel Substances 0.000 claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 claims abstract description 33
- 238000004088 simulation Methods 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910002706 AlOOH Inorganic materials 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000000429 assembly Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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Abstract
The invention provides a test system for researching the downstream effect in a CPR1000 pit filter screen pile, which comprises a water pool, a first main pipeline, a second main pipeline and a fuel assembly simulation piece, wherein the water pool is connected with the first main pipeline; the water tank and the fuel assembly simulation part form a main loop through the first main pipeline and the second main pipeline, and water which is reserved in the water tank and contains test debris flows on the main loop in a circulating mode under the driving of a circulating pump after passing through a pit filter; the first main pipeline is also provided with a heater, a cooler, a thermometer and a first electromagnetic flowmeter, and the first main pipeline is also provided with a first branch pipeline which is communicated with the water pool in a bypass way and a first electric regulating valve arranged on the first branch pipeline; a second electromagnetic flowmeter, a third electromagnetic flowmeter, a second branch pipeline which is communicated with the water pool in a bypass way and a second electric regulating valve arranged on the second branch pipeline are arranged on the second main pipeline; the fuel assembly simulation piece is connected with an external data acquisition device. By implementing the method, the plugging behavior of various fragments on the fuel assembly in the CPR1000 unit is simulated by adopting a test, and the risk evaluation is carried out on the plugging behavior.
Description
Technical Field
The invention relates to the technical field of nuclear power safety measurement, in particular to a test system for researching CPR1000 pit filter screen in-pile downstream effect.
Background
The containment vessel is used as the last barrier for containing nuclear fission products in a nuclear power plant, and the containment vessel should ensure the specified tightness in the later period of a large breach of Coolant loss Accident (LOCA), so the design of the nuclear power plant after the Accident should have the capabilities of maintaining the integrity of a reactor core and removing decay heat of fuel elements. For the CPR1000 unit, after a LOCA accident, the realizability of the functions of the main dedicated safety systems, namely the safety injection system (RIS) and the containment spray system (EAS), should be ensured so that the reactor core is in a safe state for long-term cooling. However, the high-energy coolant is sprayed from the crevasses during the accident, and in the affected area, the heat preservation, painting and the like of pipelines and equipment are inevitably dropped, and the fragments are migrated to the pit under the entrainment effect of the water flow. The pit filter, one of the key devices for the protection of the safety systems of the plant in the recirculation phase, cannot completely intercept all the debris, fine fibers and particles still enter the core without being bound by the filter bed.
In recent years, according to international empirical feedback, chemical reactions between substances in complex and harsh environments after accidents can form chemical products, generating new debris source items. After chemical products, fine fibers and particles penetrating through the pit filter enter the reactor core, the chemical products, the fine fibers and the particles can be deposited on the chip-preventing plates and the grids of the fuel assemblies, and the risk of blocking the reactor core and causing over-design basis accidents exists. This series of phenomena is referred to as "downstream effects in the stack".
Therefore, it is necessary to study the blocking behavior of various fragments of the pressurized water reactor CPR1000 unit which migrate to the pressurized water reactor core to the fuel assemblies in the CPR1000 unit after an extreme loss accident, and to make a risk evaluation on the blocking behavior.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a test system for researching the downstream effect in a CPR1000 pit filter screen stack, which can simulate the blocking behavior of various fragments on a fuel assembly in a CPR1000 unit by adopting a test and evaluate the risk of the blocking behavior.
In order to solve the technical problem, an embodiment of the present invention provides a test system for studying a downstream effect in a CPR1000 pit strainer pile, where the test system includes a water tank, a first main pipe for simulating spraying of an EAS system, a second main pipe for simulating injection of an RIS system, and a fuel assembly simulator; wherein the content of the first and second substances,
the water tank sequentially passes through the first main pipeline and the second main pipeline to form a communicated main loop with the fuel assembly simulation part, and a detachable pit filter is installed in the water tank, so that water reserved in the water tank and containing certain test fragments is filtered by the pit filter and can be driven to circularly flow on the main loop through at least one circulating pump arranged on one side, close to the water tank, of the first main pipeline; wherein the test pieces comprise fiber pieces, particle pieces and chemical products; the pit filter is positioned at the connection between the pool and the first main pipeline;
the first main pipeline is also provided with a pipeline heater, a coil cooler, a thermometer and a first electromagnetic flowmeter, and a first branch pipeline which is communicated with the water pool in a bypass way is also arranged on one side, close to the second main pipeline, of the first main pipeline; wherein, the first branch pipeline is also provided with a first electric regulating valve; the first electromagnetic flowmeter and each circulating pump realize signal interconnection;
a second electromagnetic flowmeter, a third electromagnetic flowmeter and a second branch pipeline which is arranged between the second electromagnetic flowmeter and the third electromagnetic flowmeter and is communicated with the water pool in a bypass way are arranged on the second main pipeline; wherein, a second electric regulating valve is also arranged on the second branch pipeline; the second electromagnetic flow meter and the first electric regulating valve and the third electromagnetic flow meter and the second electric regulating valve respectively realize signal correlation correspondingly;
the fuel assembly simulation piece is connected with an external data acquisition device.
Wherein the pit filter is comprised of two hexagonal prism shaped cartridges.
Wherein the fuel assembly simulator comprises a test column made of transparent material and an AFA-3G fuel assembly which is installed in the test column and has 1/2 length.
Wherein, test system still including set up in electric agitator, differential pressure gauge, turbidity appearance and the PH meter in the pond.
Wherein, the test system also comprises a configuration groove which is connected with the water pool and is used for configuring chemical products in the test fragments.
Wherein, the test system also comprises a water purifier which is connected with the water pool and is used for producing A-grade pure water meeting the RCC-M requirement.
The testing system further comprises a muddy pump arranged on a communication pipeline between the configuration tank and the water purification machine.
And bag filters used for intercepting fiber fragments in the test fragments are arranged on the first main pipeline and the second main pipeline.
Wherein, the circulating pump has two, and two the circulating pump connects in parallel on the first trunk line.
Wherein the test fragments are added in the order of particle fragments, chemical products and fiber fragments.
Wherein the fiber fragments in the test fragments are cylindrical glass fibers; the particle fragments in the test fragments are 10 mu m of silicon carbide; the chemical product in the test pieces was AlOOH.
The embodiment of the invention has the following beneficial effects:
according to the invention, a certain amount of test fragments are put into the pool, and the opening and closing of different electric regulating valves are controlled, so that the blockage behavior of various fragments of the pressurized water reactor core on the fuel assembly simulation piece when the RIS system and the EAS system in the CPR1000 unit are put into operation is simulated by regulating the size of the electromagnetic flow meter on which water flows through the second main pipeline, and the risk evaluation can be made on the blockage behavior.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a connection configuration of a test system for studying downstream effects in a CPR1000 pit screen stack according to an embodiment of the present invention;
fig. 2 is a diagram of an application scenario of 1/2 fuel assemblies in a test system for studying downstream effects in a CPR1000 pit screen stack according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a test system for studying the downstream effect in a CPR1000 pit strainer pile is provided, which includes a water tank 1, a first main pipe 2 for simulating spraying of an EAS system, a second main pipe 3 for simulating injection of a RIS system, and a fuel assembly simulator 4; wherein the content of the first and second substances,
the water tank 1 sequentially passes through the first main pipeline 2 and the second main pipeline 3 to form a communicated main loop with the fuel assembly simulation part 4, and a pit filter 5 which is detachable and is positioned at the joint between the water tank 1 and the first main pipeline 2 is arranged in the water tank 1, so that water reserved in the water tank 1 and containing certain test fragments is filtered by the pit filter 5 and can be driven to circularly flow on the main loop through at least one circulating pump 6 which is arranged on one side, close to the water tank 2, of the first main pipeline 2; the test fragments comprise fiber fragments, particle fragments and chemical products, and can be directly mixed into the pool 2 after being prepared, or can be prepared on site and enter the pool 2 through different feeding platforms or output pipelines; in one embodiment, the fiber fragments are cylindrical glass fibers, the particle fragments are 10 μm silicon carbide, the chemical product is AlOOH, and the addition sequence is particle fragments, chemical product and fiber fragments; the pit filter 5 consists of two hexagonal prism-shaped filter cartridges;
the first main pipeline 2 is also provided with a pipeline heater 21, a coil cooler 22, a thermometer 23 and a first electromagnetic flowmeter 24, and the first main pipeline 2 is also provided with a first branch pipeline 25 which is communicated with the water pool 2 in a bypass way at one side close to the second main pipeline 3; wherein, the first branch pipe 25 is further provided with a first electric control valve 26; the first electromagnetic flowmeter 24 is in signal interconnection with each circulating pump 6;
the second main pipeline 3 is provided with a second electromagnetic flowmeter 31, a third electromagnetic flowmeter 32 and a second branch pipeline 33 which is arranged between the second electromagnetic flowmeter 31 and the third electromagnetic flowmeter 32 and forms bypass conduction with the water pool 2; wherein, the second branch pipe 33 is also provided with a second electric control valve 34; the second electromagnetic flow meter 31 and the first electric regulating valve 26 and the third electromagnetic flow meter 32 and the second electric regulating valve 34 respectively realize signal correlation;
the fuel assembly simulation piece 4 is connected with an external data acquisition device; the fuel assembly simulation piece 4 comprises a test column made of transparent materials (such as PVC polyvinyl chloride, PS polystyrene and the like) and an AFA-3G fuel assembly which is installed in the test column and has the length of 1/2, so that the influence of test fragments on the anti-scrap plate and a positioning grid of the fuel assembly simulation piece 4 after forming a bed can be observed and researched (as shown in figure 2), the field process measurement and control are realized by a Programmable Logic Controller (PLC) through an external data acquisition device consisting of the PLC and two industrial control machines, and an upper computer PC is responsible for monitoring the operation of the PLC and acquiring test signals.
It should be noted that the test column includes a lower cavity, a core support plate, a fuel assembly shroud, and an upper cavity; wherein, the lower chamber has the function of stirring and distributing the fluid, so that the fluid can be uniformly mixed and completely enter the fuel assembly. The size and the shape of the reactor core supporting plate are completely simulated according to the actual condition of the reactor core supporting plate of the CPR1000 unit and are divided into 4 drain holes and 2 positioning pins. The clearance between the fuel assembly shroud and the test fuel assembly is 1/2 of the nominal clearance between the fuel assemblies in the core, while the shroud housing provides a measurement channel for the data measurement and acquisition system. The upper chamber is maintained in operative engagement with the test loop.
In the embodiment of the invention, the flow control of the whole test system is divided into a main loop and a bypass loop; the main loop adopts a circulating pump 6 driven by a variable frequency motor, the variable frequency motor on the circulating pump 6 is controlled by the measured value of a first electromagnetic flowmeter 24, and the control of the flow of a recirculation system is realized by introducing negative feedback linkage; the bypass loop is associated with the measured value of the second electromagnetic flowmeter 31 through the first electric regulating valve 26, so that the reasonable distribution of the main loop flow is realized, and the stability of the test flow is ensured. Of course, the second electrical control valve 34 is correlated to the third electromagnetic flow meter 32 measurement to effect control of the breach flow. Therefore, after an extreme water loss accident, the RIS system injects water and the EAS system sprays different operation conditions, and various fragments block the fuel assembly simulation part 4 and make risk evaluation by controlling the flow of the second main pipeline 3 and the bypass loop of the first main pipeline 2 to simulate the CPR1000 unit.
In order to further reduce the granularity of the test fragments, the test system further comprises an electric stirrer, a differential pressure gauge, a turbidity meter and a PH meter which are arranged in the water tank 1, wherein the electric stirrer is provided with a variable frequency motor, so that the rotating speed of the electric stirrer can be adjusted within a certain range, and the test fragments are prevented from being deposited at dead angles of the water tank 1. Of course, in one embodiment, there are two electric agitators, both disposed above the basin 2.
In order to carry out the on-site preparation of the chemical products in the test pieces, the test system therefore also comprises a preparation tank 7 which is connected to the basin 1 and is used for preparing the chemical products in the test pieces.
In order to ensure the objectivity and accuracy of the test, the test system therefore also comprises a water purification machine 8 connected to the basin 1 and intended to produce a class A purified water meeting the RCC-M requirements.
In order to be able to prepare strong alkaline chemical solution, the chemical environment in the containment vessel after the extreme loss of coolant accident of the CPR1000 unit can be simulated, so the test system also comprises a stirring pump 9 arranged on a communication pipeline between the configuration tank 7 and the water purifier 8.
In order to intercept the fiber fragments in the main loop, study the bypass behavior of the fiber fragments and provide objective data support for the out-of-pile downstream effect and other scientific research subjects, bag filters 10 for intercepting the fiber fragments in the test fragments are arranged on the first main pipe 2 and the second main pipe 3.
In order to realize the main-standby switching function of the circulating pump 6, two circulating pumps 6 are provided, and the two circulating pumps 6 are connected to the first main pipeline 2 in parallel.
From the above, it can be seen that the test system for studying the downstream effect in a CPR1000 pit screen stack in the practice of the present invention has several sub-system functions:
(a) the recycling subsystem is used for driving water in the water pool 1 to flow on a main loop formed by the water pool 1, the first main pipeline 2, the second main pipeline 3 and the fuel assembly simulation piece 4 by the circulating pump 6 so as to realize back-and-forth circulation;
(b) the water tank stirring subsystem is used for providing a water source for the recycling subsystem, is a fragment adding and observing platform for fibers, particles, chemical products and the like, can continuously stir the fragments and prevent the fragments from depositing, and mainly comprises a water tank 1, an electric stirrer, a differential pressure gauge, a turbidity meter, a PH meter and the like;
(c) the data acquisition subsystem is used for realizing real-time monitoring and recording of the pressure loss data among the chip-preventing plates and the grillworks of the fuel assembly simulation part 4 and mainly comprises the fuel assembly simulation part 4 and an external data acquisition device;
(d) the flow control subsystem is used for ensuring that the test flow is near a given value and the test is developed under the constant flow and mainly comprises electric regulating valves, electromagnetic flowmeters and the like;
(e) the chemical liquid preparation subsystem realizes the preparation of strong alkaline chemicals so as to meet the requirements of a test chemical environment and mainly comprises a configuration tank 7, a muddy pump 9 and the like;
(f) the deionized water preparation subsystem adopts a water purifier 8 which is mature in the market and can provide grade A pure water meeting the test requirements;
(g) and in the heating and cooling subsystem, the first main pipeline 2 is combined by adopting a pipeline heater 21 and a coil cooler 22, a thermometer 23 is arranged at an outlet, the temperature of the loop is monitored in real time, and the measured parameters are linked with a coolant control valve, so that the temperature of the test loop is accurately controlled.
The concrete simulation working conditions of the test system for researching the downstream effect in the CPR1000 pit filter screen stack in the embodiment of the invention are further explained as follows:
two-row RIS system commissioning, no EAS bypass diversion, no test prototype: the method comprises the following steps of (1) removing a pit filter 5 in the pool 1 to enable the pool 1 to have no test prototype, closing a first electric regulating valve 26 on a first branch pipeline 25 to form no EAS bypass branch, and regulating a second electric regulating valve 34 to enable the flow passing through a third electromagnetic flowmeter 32 on a second main pipeline 3 to be amplified to form a double-row RIS system to be injected into a fuel assembly simulator 4;
single train RIS system commissioning, no EAS bypass diversion, no test prototype: the method comprises the following steps of (1) removing a pit filter 5 in the pool 1 to enable the pool 1 to have no test prototype, closing a first electric regulating valve 26 on a first branch pipeline 25 to form no EAS bypass branch, and regulating a second electric regulating valve 34 to enable the flow passing through a third electromagnetic flowmeter 32 on a second main pipeline 3 to be reduced to form a single-row RIS system to be injected into a fuel assembly simulator 4;
two-row RIS system commissioning, no EAS bypass diversion, containing test prototypes: the pit filter 5 is assembled into the water pool 1, so that a test prototype is contained in the water pool 1, the first electric regulating valve 26 on the first branch pipeline 25 is closed to form an EAS-free bypass branch, the second electric regulating valve 34 is regulated to increase the flow passing through the third electromagnetic flowmeter 32 on the second main pipeline 3, and a double-row RIS system is formed and injected into the fuel assembly simulator 4;
single train RIS system commissioning, no EAS bypass diversion, containing test prototypes: assembling the pit filter 5 into the water pool 1 to enable the water pool 1 to contain a test prototype, closing the first electric regulating valve 26 on the first branch pipeline 25 to form an EAS-free bypass branch, and regulating the second electric regulating valve 34 to enable the flow passing through the third electromagnetic flowmeter 32 on the second main pipeline 3 to be reduced, so that a single-row RIS system is formed and injected into the fuel assembly simulator 4;
dual-row RIS system commissioning, with single or dual-row EAS bypass shunts, containing test prototypes: the pit filter 5 is assembled into the water pool 1, so that a test prototype is contained in the water pool 1, the first electric regulating valve 26 on the first branch pipeline 25 is opened to form an EAS bypass branch, the second electric regulating valve 34 is regulated to increase the flow passing through the third electromagnetic flowmeter 32 on the second main pipeline 3, and a double-row RIS system is formed and injected into the fuel assembly simulator 4;
single train RIS system commissioning with single or double train EAS bypass diversion, with test prototypes: the test prototype is contained in the pool 1 by assembling the pit filter 5 into the pool 1, the EAS-free bypass shunt is formed by opening the first electric control valve 26 on the first branch pipe 25, and the flow rate passing through the third electromagnetic flow meter 32 on the second main pipe 3 is reduced by adjusting the second electric control valve 34, so that the single-row RIS system is formed and injected into the fuel assembly simulator 4.
The embodiment of the invention has the following beneficial effects:
according to the invention, a certain amount of test fragments are put into the pool, and the opening and closing of different electric regulating valves are controlled, so that the blockage behavior of various fragments of the pressurized water reactor core on the fuel assembly simulation piece when the RIS system and the EAS system in the CPR1000 unit are put into operation is simulated by regulating the size of the electromagnetic flow meter on which water flows through the second main pipeline, and the risk evaluation can be made on the blockage behavior.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (8)
1. A test system for researching CPR1000 pit strainer in-pile downstream effect is characterized in that the test system comprises a water pool (1), a first main pipe (2) for simulating spraying of an EAS system, a second main pipe (3) for simulating injection of a RIS system and a fuel assembly simulation piece (4); wherein the content of the first and second substances,
the water tank (1) sequentially passes through the first main pipeline (2) and the second main pipeline (3) to form a main loop communicated with the fuel assembly simulation part (4), and a detachable pit filter (5) is installed in the water tank (1), so that water reserved in the water tank (1) and containing certain test fragments is filtered by the pit filter (5) and can be driven to circularly flow on the main loop through at least one circulating pump (6) arranged on one side, close to the water tank (2), of the first main pipeline (2); wherein the test pieces comprise fiber pieces, particle pieces and chemical products; the pit filter (5) is positioned at the connection between the pool (1) and the first main pipeline (2);
the first main pipeline (2) is further provided with a pipeline heater (21), a coil cooler (22), a thermometer (23) and a first electromagnetic flowmeter (24), and a first branch pipeline (25) which is communicated with the water pool (2) in a bypass mode is further arranged on one side, close to the second main pipeline (3), of the first main pipeline (2); wherein the first branch pipeline (25) is also provided with a first electric regulating valve (26); the first electromagnetic flowmeter (24) is in signal interconnection with each circulating pump (6);
a second electromagnetic flowmeter (31), a third electromagnetic flowmeter (32) and a second branch pipeline (33) which is arranged between the second electromagnetic flowmeter (31) and the third electromagnetic flowmeter (32) and is communicated with the water pool (2) in a bypass way are arranged on the second main pipeline (3); wherein, a second electric regulating valve (34) is also arranged on the second branch pipeline (33); the second electromagnetic flow meter (31) and the first electric regulating valve (26) and the third electromagnetic flow meter (32) and the second electric regulating valve (34) respectively realize signal correlation;
the fuel assembly simulation piece (4) is connected with an external data acquisition device;
wherein, bag filters (10) for intercepting fiber fragments in the test fragments are respectively arranged on the first main pipe (2) and the second main pipe (3);
wherein the adding sequence of the test fragments is particle fragments, chemical products and fiber fragments in turn;
wherein the fiber fragments in the test fragments are cylindrical glass fibers; the particle fragments in the test fragments are 10 mu m of silicon carbide; the chemical product in the test pieces was AlOOH.
2. Testing system according to claim 1, characterized in that the pit filter (5) consists of two hexagonal prism-shaped cartridges.
3. Testing system according to claim 2, characterized in that the fuel assembly simulation (4) comprises a test column made of transparent material and an AFA-3G fuel assembly of 1/2 length mounted inside the test column.
4. The testing system according to claim 3, further comprising an electric stirrer, a differential pressure gauge, a turbidity meter and a pH meter arranged in the water basin (1).
5. The test system according to claim 4, further comprising a configuration tank (7) connected to the basin (1) for configuring chemical products in the test pieces.
6. Test system according to claim 5, characterized in that it further comprises a pure water machine (8) connected to the basin (1) and adapted to produce pure water of class A meeting RCC-M requirements.
7. The testing system according to claim 6, further comprising a turbid pump (9) disposed in the communication conduit between the configuration tank (7) and the water purification machine (8).
8. Test system according to claim 7, characterised in that said circulation pumps (6) are two and in that two of said circulation pumps (6) are connected in parallel to said first main conduit (2).
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| CN107221362B (en) * | 2017-04-27 | 2021-06-18 | 中国核电工程有限公司 | Pit filter performance evaluation experimental system |
| CN111028961A (en) * | 2019-12-12 | 2020-04-17 | 华北电力大学 | Simulation system and method for fragment flow in fuel assembly after pressurized water reactor accident |
| CN116361972B (en) * | 2023-04-07 | 2024-01-16 | 上海核工程研究设计院股份有限公司 | Filter screen failure PSA modeling method and system for passive nuclear power plant |
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| KR101406715B1 (en) * | 2013-03-13 | 2014-06-12 | 한국수력원자력 주식회사 | Apparatus and method for testing in-vessel downstream effects of a pressurized water reactor |
| CN105206314A (en) * | 2015-08-18 | 2015-12-30 | 中科华核电技术研究院有限公司 | Visual testing column device for studying blockage behavior of fuel assembly |
| CN106448761A (en) * | 2016-11-17 | 2017-02-22 | 中国核动力研究设计院 | Comprehensive performance verification experiment device of containment sump filter screen of nuclear power plant |
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