CN113421661A - System for preventing steam generator from overflowing - Google Patents
System for preventing steam generator from overflowing Download PDFInfo
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- CN113421661A CN113421661A CN202110538581.4A CN202110538581A CN113421661A CN 113421661 A CN113421661 A CN 113421661A CN 202110538581 A CN202110538581 A CN 202110538581A CN 113421661 A CN113421661 A CN 113421661A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/10—Means for preventing contamination in the event of leakage, e.g. double wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
- F22B1/162—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour in combination with a nuclear installation
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
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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 invention belongs to the technical field of accident analysis of nuclear power plants, and particularly relates to a system for preventing a steam generator from overflowing, which comprises: the system comprises a pressure vessel, a steam generator, a main pump, an auxiliary water supply stepping adjusting subsystem, a rapid cooling subsystem, a medium-pressure safety injection subsystem and a sewage disposal subsystem; the auxiliary water supply stepping adjustment subsystem is connected with a main water supply pipeline of the steam generator through a first injection pipeline, the rapid cooling subsystem is connected with the main steam pipeline of the steam generator through a first discharge pipeline, the medium-pressure safety injection subsystem is connected with a cold pipe section of the pressure container through a second injection pipeline, and the blowdown subsystem is connected with the steam generator through a second discharge pipeline. According to the invention, the auxiliary water supply stepping adjustment subsystem, the rapid cooling subsystem, the medium-pressure safety injection subsystem and the sewage discharge subsystem are arranged to operate in a matched manner, so that the overflow of a damaged steam generator can be prevented after an SGTR accident, and the radioactive substance release after the accident meets the regulation requirements.
Description
Technical Field
The invention belongs to the technical field of accident analysis of nuclear power plants, and particularly relates to a system for preventing a steam generator from overflowing.
Background
Steam generator heat transfer tube failure (SGTR) is one of the design benchmark accidents of a pressurized water reactor nuclear power plant, and from the operating experience of a pressurized water reactor, more than ten accidents have occurred since the 80 s of the 20 th century, and the handling of the accidents has stricter radioactive consequence acceptance criteria. In case of SGTR accident, the damaged steam generator may overflow, and the high radioactive substance effluent will release a great amount of radioactive substance through the atmospheric vent valve or safety valve, so that the nuclear power plant should be designed to avoid the overflow of the steam generator as much as possible.
At present, in the design of the second generation and second generation improved power plants in domestic use, the improved measures after the SGTR accident are not provided. For example, the high-pressure safety injection pump design adopted by the domestic in-service M310 unit has higher injection pressure head, so that the cooling and pressure reduction rate of a primary circuit is slower, and the leakage from the primary side to the secondary side is aggravated; the rapid cooling subsystem and the auxiliary water supply subsystem are manually adjusted, the opening degrees of the auxiliary water supply system and the rapid cooling system adjusting valve are manually adjusted according to the cooling and pressure reducing rate of the primary loop after an accident, the rapid cooling and pressure reducing effect of the primary loop cannot be achieved, and the steam generator still has the risk of overflow within 30 minutes after the accident without intervention; the blowdown subsystem does not set up the discharge pipe of preventing overflowing, if normal blowdown pipeline is available after the accident, only discharge through normal non-safety level's blowdown pipeline, if unavailable, then can't alleviate accident steam generator overflow risk.
Thus, with existing designs, it is difficult to avoid steam generator overfill after an SGTR event.
Disclosure of Invention
The invention aims to provide a system for preventing a steam generator from overflowing, which can prevent the overflow of a damaged steam generator after an SGTR accident by arranging an auxiliary water supply stepping adjusting subsystem, a quick cooling subsystem, a medium-pressure safety injection subsystem and a sewage discharge subsystem for matching operation, and ensure that the radioactive substance release after the accident meets the requirements of regulations.
The technical scheme for realizing the purpose of the invention is as follows:
a system for preventing steam generator overfill, said system comprising: the system comprises a pressure vessel, a steam generator, a main pump, an auxiliary water supply stepping adjusting subsystem, a rapid cooling subsystem, a medium-pressure safety injection subsystem and a sewage disposal subsystem;
the steam generator is connected with the pressure vessel through the heat pipe section, the main pump is connected with the pressure vessel through the cold pipe section, the main pump is connected with the steam generator through the transition section pipeline,
the auxiliary water supply stepping regulation subsystem comprises an auxiliary water supply storage tank, an auxiliary water supply pump and a first injection pipeline, wherein the auxiliary water supply storage tank is connected with a main water supply pipeline of the steam generator through the first injection pipeline and the auxiliary water supply pump;
the rapid cooling subsystem comprises a silencer and a first discharge pipeline, and the silencer is connected with a main steam pipeline of the steam generator through the first discharge pipeline;
the medium-pressure safety injection subsystem comprises a built-in refueling water tank, a medium-pressure safety injection pump and a second injection pipeline, wherein the built-in refueling water tank is connected with three loop injection pipelines of the reactor coolant system through the second injection pipeline and the medium-pressure safety injection pump and is connected with a pressure container cold pipe section through the three loop injection pipelines;
the blowdown subsystem comprises a bubbler and a second discharge pipeline, the bubbler is arranged in the built-in refueling water tank, and the bubbler is connected with the steam generator through the second discharge pipeline.
Furthermore, the auxiliary water supply step regulation subsystem further comprises a flow regulating valve, and the flow regulating valve is arranged on a first injection pipeline between the auxiliary water supply pump and a main water supply pipeline of the steam generator.
Further, the auxiliary water supply step regulation subsystem further comprises a first electric isolation valve assembly, and the first electric isolation valve assembly is arranged on a first injection pipeline between the auxiliary water supply pump and a main water supply pipeline of the steam generator and is positioned at the downstream of the flow regulating valve.
Further, the first electrically powered isolation valve assembly includes at least two first electrically powered valves in series.
Furthermore, the auxiliary water supply stepping regulation subsystem comprises at least two first injection pipelines connected in parallel, each first injection pipeline is sequentially provided with an auxiliary water supply pump, a flow regulating valve and a first electric isolation valve component in series, the auxiliary water supply pump is positioned at the upstream of the flow regulating valve, and the flow regulating valve is positioned at the upstream of the first electric isolation valve component; the initial end of each first injection pipeline is respectively connected with an auxiliary feed water storage tank or the initial end of each first injection pipeline is combined and then connected with an auxiliary feed water storage tank.
Further, the rapid cooling subsystem further comprises an atmospheric vent valve and a second electric isolation valve assembly, the atmospheric vent valve and the second electric isolation valve assembly are sequentially connected in series on the first vent line, and the second electric isolation valve assembly is located at the upstream of the atmospheric vent valve.
Further, the atmospheric vent valve is a remotely controlled pneumatic regulator valve.
Further, the rapid cooling subsystem further comprises a compressed air storage tank and a first air supply line, wherein the compressed air storage tank is connected with the atmosphere vent valve through the first air supply line.
Further, the rapid cooling subsystem further comprises a third electrically-operated isolation valve assembly disposed in the first air supply line between the compressed air storage tank and the atmospheric vent valve.
Further, the rapid cooling subsystem further comprises a compressed air system and a second air supply line, the normal compressed air system being connected to the first air supply line through the second air supply line, and the second air supply line being connected to the first air supply line upstream of the third electrically powered isolation valve assembly.
Further, the rapid cooling subsystem further comprises a first check valve disposed on the second air supply line between the normal compressed air system and the third electrically-operated isolation valve assembly and upstream of the compressed air storage tank.
Further, the rapid cooling subsystem comprises at least two first discharge pipelines connected in parallel, each first discharge pipeline is sequentially provided with a second electric isolation valve component and an atmospheric discharge valve in series, and the second electric isolation valve component is positioned at the upstream of the atmospheric discharge valve; the tail end of each first discharge pipeline is connected with a silencer respectively or the tail end of each first discharge pipeline is combined and then connected with a silencer.
Furthermore, an atmospheric vent valve on each first vent line in the rapid cooling subsystem is connected with a compressed air storage tank through one first air supply line, and the starting end of each first air supply line is connected with one compressed air storage tank or the starting ends of the first air supply lines are combined and then connected with one compressed air storage tank.
Further, the blowdown subsystem further comprises a fourth electric isolation valve assembly, a second check valve and a fifth electric isolation valve assembly, wherein the fourth electric isolation valve assembly, the second check valve and the fifth electric isolation valve assembly are sequentially arranged on the second discharge line in series, the second check valve is located at the upstream of the fifth electric isolation valve assembly, and the fourth electric isolation valve assembly is located at the upstream of the second check valve.
Further, the fourth electric isolation valve assembly comprises at least two rows of normally closed electric isolation valves connected in parallel, and each row of normally closed electric isolation valves are respectively powered by different power supplies.
Furthermore, the medium-pressure safety injection subsystem comprises at least two second discharge pipelines connected in parallel, and each second discharge pipeline is provided with a medium-pressure safety injection pump; the tail end of each second injection pipeline is respectively connected with a loop injection pipeline, a second loop injection pipeline and a third loop injection pipeline, or the tail end of each second injection pipeline is combined into a mother pipeline and then connected with the loop injection pipeline, the second loop injection pipeline and the third loop injection pipeline.
The invention has the beneficial technical effects that:
1. according to the system for preventing the overflow of the steam generator, the liquid level of the steam generator can be accurately controlled through the flow regulating valve and the first electric isolating valve component arranged on the auxiliary water supply stepping regulating subsystem, so that the overflow is avoided;
2. according to the system for preventing the overflow of the steam generator, the automatic-adjustment atmospheric discharge valve is arranged in the rapid cooling subsystem, so that the rapid cooling of the primary loop can be realized after an accident, the pressure of the primary loop and the pressure of the secondary loop are rapidly balanced, and the leakage from the primary side to the secondary side is slowed down;
3. the system for preventing the steam generator from overflowing reduces the injection pressure of the medium-pressure safety injection pump through the arranged medium-pressure safety injection subsystem, thereby being beneficial to quickly reducing the pressure of a primary circuit and reducing the leakage of a primary side to a secondary side;
4. the system for preventing the overflow of the steam generator provided by the invention can discharge the steam generator in time when the overflow risk occurs through the discharge pipeline in the sewage disposal subsystem, thereby avoiding the overflow and ensuring that radioactive substances meet the standard requirements of regulations after an accident.
Drawings
FIG. 1 is a schematic diagram of a system for preventing steam generator flooding according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a system for preventing an overflow of a steam generator according to the present invention.
In the figure:
1-a pressure vessel, 2-a steam generator, 3-a main pump, 4-a main water supply pipeline and 5-a main steam pipeline;
10-a first injection line, 11-an auxiliary feed water storage tank, 12-an auxiliary feed water pump, 13-a flow regulating valve, 14-a first electrically-operated isolation valve assembly;
20-a first discharge line, 21-a muffler, 22-a second electrically-operated isolation valve assembly, 23-an atmospheric discharge valve, 24-a compressed air storage tank, 25-a first air supply line, 26-a third electrically-operated isolation valve assembly, 27-a second air supply line, 28-a first check valve;
30-a second injection pipeline, 31-a built-in refueling water tank and 32-a medium-pressure safety injection pump;
40-second discharge line, 41-fourth electrically powered isolation valve assembly, 42-second check valve, 43-fifth electrically powered isolation valve assembly, 44-bubbler.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention provides a system for preventing an overfilling of a steam generator, comprising: the system comprises a pressure vessel 1, a steam generator 2, a main pump 3, an auxiliary water supply stepping adjusting subsystem, a rapid cooling subsystem, a medium-pressure safety injection subsystem and a sewage disposal subsystem. Steam generator 2 passes through the heat pipe section and is connected with pressure vessel 1, and main pump 3 passes through the cold leg section and is connected with pressure vessel 1, and main pump 3 passes through the transition pipeline and is connected with steam generator 2. When the nuclear power plant is operated, high-temperature coolant in the reactor pressure vessel 1 enters the steam generator 2 through the main loop heat pipe section to be cooled, and then returns to the reactor pressure vessel 1 through the main pump 3 through the transition section after being cooled. The auxiliary water supply step adjusting subsystem is connected with the main water supply pipe 4 of the steam generator 2 through a first injection pipeline 10; the rapid cooling subsystem is connected to the main steam pipe 5 of the steam generator 2 by means of a first discharge line 20; the medium pressure safety injection subsystem is connected with the cold pipe section of the pressure vessel 1 through a second injection pipeline 30; the blowdown sub-system is connected to the steam generator 2 through a second blowdown line 40.
Auxiliary water supply stepping adjusting subsystem
The auxiliary water supply stepping regulation subsystem comprises an auxiliary water supply storage tank 11, an auxiliary water supply pump 12, a flow regulating valve 13, a first electric isolation valve assembly 14 and a first injection pipeline 10, wherein the starting end of the first injection pipeline 10 is connected with the auxiliary water supply storage tank 11, the tail end of the first injection pipeline 10 is connected with a main water supply pipeline 4 of the steam generator 2, the auxiliary water supply pump 12, the flow regulating valve 13 and the first electric isolation valve assembly 14 are sequentially connected with the first injection pipeline 10 in series, the outlet of the auxiliary water supply storage tank 11 is connected with the inlet of the auxiliary water supply pump 12, the outlet of the auxiliary water supply pump 12 is sequentially provided with the flow regulating valve 13 and the first electric isolation valve assembly 14, and the first electric isolation valve assembly 14 is located at the downstream of the flow regulating valve 13. The auxiliary feed water pump 12 takes water from the auxiliary feed water storage tank 11, adjusts the flow rate by the flow rate adjustment valve 13, and finally injects the water into the steam generator 2.
The flow regulating valve 13 is in a fully open state when the power plant normally operates, and the opening degree is automatically regulated according to the liquid level of the steam generator 2 after an SGTR accident. The flow control valve 13 is provided with two control gears, a low gear and a high gear. After the SGTR accident, when the liquid level in the steam generator 2 reaches a high liquid level set value, the opening degree of the flow regulating valve 13 is regulated to a low level, so that the steam generator 2 is prevented from overflowing; when the liquid level in the steam generator 2 reaches the low liquid level set value, the flow regulating valve 13 is regulated to a high gear, so that the liquid level in the steam generator 2 is prevented from being too low.
The first electrically powered isolation valve assembly 14 may include at least two first electrically powered isolation valves in series. Alternatively, as shown in FIG. 1, the first electrically powered isolation valve assembly 14 includes two first electrically powered isolation valves in series.
The auxiliary water supply stepping regulation subsystem comprises at least two first injection pipelines 10 connected in parallel, each first injection pipeline 10 is sequentially connected with an auxiliary water supply pump 12, a flow regulating valve 13 and a first electric isolation valve assembly 14 in series, the auxiliary water supply pump 12 is positioned at the upstream of the flow regulating valve 13, and the flow regulating valve 13 is positioned at the upstream of the first electric isolation valve assembly 14; the initial end of each first injection line 10 is connected with an auxiliary feed water storage tank 11 or the initial end of each first injection line 10 is combined and then connected with an auxiliary feed water storage tank 11.
Optionally, as shown in fig. 2, the auxiliary water supply step adjustment subsystem includes two parallel first injection lines 10, each first injection line 10 is sequentially connected in series with an auxiliary water supply pump 12, a flow regulating valve 13 and a first electric isolation valve assembly 14, each first electric isolation valve assembly 14 includes two first electric isolation valves connected in series, and the starting ends of the two first injection lines 10 are combined and then connected to an auxiliary water supply storage tank 11.
Rapid cooling subsystem
The rapid cooling subsystem comprises a silencer 21, a second electric isolation valve assembly 22, an atmospheric discharge valve 23, a compressed air storage tank 24, a first air supply line 25, a third electric isolation valve assembly 26, a second air supply line 27, a first check valve 28 and a first discharge line 20, wherein the starting end of the first discharge line 20 is connected with the main steam pipeline 5 of the steam generator 2, the tail end of the first discharge line 20 is connected with the inlet of the silencer 21, the outlet of the silencer 21 is communicated with the atmosphere, and the steam in the main steam pipeline 5 is discharged to the atmosphere; a second electric isolation valve assembly 22 and an atmospheric discharge valve 23 are sequentially arranged on the first discharge pipeline 20 in series, and the second electric isolation valve assembly 22 is positioned at the upstream of the atmospheric discharge valve 23; the atmospheric vent valve 23 is connected to a compressed air storage tank 24 via a first air supply line 25, and a third electrically operated isolation valve assembly 26 is provided on the first air supply line 25.
Alternatively, as shown in FIG. 1, the atmospheric vent valve 23 may also be connected to the normal compressed air system through a second air supply line 27, with the second air supply line 27 being connected to the first air supply line 25 upstream of the third electrically powered isolation valve assembly 26. A first check valve 28 is provided on the second air supply line 27 between the normal compressed air system and the third electrically powered isolation valve assembly 26, the first check valve 28 being located upstream of the compressed air storage tank 24.
The atmospheric vent valve 23 is a remotely controlled pneumatic regulator valve that is automatically regulated by compressed air from a compressed air storage tank 24 and/or a normal compressed air system.
The inlet of the atmospheric discharge valve 23 receives the steam in the main steam pipe 5, and the outlet of the atmospheric discharge valve 23 is connected with the silencer 21 to discharge the steam in the main steam pipe 5 to the atmosphere; the post-SGTR event atmospheric vent valve 23 is powered by compressed air from the compressed air storage tank 24 and/or normal compressed air system to vent the vapor in the main vapor line 5 to atmosphere.
The rapid cooling subsystem comprises at least two parallel first discharge pipelines 20, each first discharge pipeline 20 is sequentially provided with a second electric isolation valve assembly 22 and an atmospheric discharge valve 23 in series, and the second electric isolation valve assembly 22 is positioned at the upstream of the atmospheric discharge valve 23; the tail end of each first discharge pipeline 20 is respectively connected with a silencer 21 or the tail end of each first discharge pipeline 20 is combined and then connected with a silencer 21. The atmospheric vent valve 23 of each first vent line 20 is connected to a compressed air storage tank 24 through a first air supply line 25, and the start end of each first air supply line 25 is connected to a compressed air storage tank 24 or the start ends of the first air supply lines 25 are combined and then connected to a compressed air storage tank 24. The second air supply line 27 connected to the normal compressed air system is branched into a plurality of branch lines of the second air supply line 27, which are connected to the first air supply line 25 corresponding to each atmospheric discharge valve 23 upstream of the third electrically operated isolation valve assembly 26, respectively, or the first air supply line 25 corresponding to each atmospheric discharge valve 23 upstream of the third electrically operated isolation valve assembly 26 is merged into a mother line of the first air supply line 25, and the second air supply line 27 is connected to the mother line of the first air supply line 25.
The rapid cooling subsystem comprises at least two first discharge pipelines 20, after an SGTR accident, the atmospheric discharge valve 23 is powered by compressed air of the compressed air storage tank 24 and/or a normal compressed air system, and the atmospheric discharge valve 23 discharges steam rapidly and controllably, so that the reactor coolant system is automatically and rapidly depressurized until the steam generator 2 reaches a controllable state.
Optionally, as shown in fig. 2, the rapid cooling subsystem includes two first discharge lines 20 connected in parallel, a start end of each first discharge line 20 is connected to the main steam pipe 5 of the steam generator 2, a second electrical isolation valve assembly 22 and an atmospheric discharge valve 23 are sequentially connected in series on each first discharge line 20, each second electrical isolation valve assembly 22 includes a second electrical isolation valve, and ends of the two first discharge lines 20 are merged and then connected to a silencer 21 to discharge steam in the main steam pipe 5 to the atmosphere. Each atmospheric vent valve 23 is connected to a compressed air storage tank 24 through a first air supply line 25, third electrically operated isolation valve assemblies 26 are provided on the first air supply lines 25, each set of third electrically operated isolation valve assemblies 26 includes a third electrically operated isolation valve, and each first air supply line 25 is connected to one compressed air storage tank 24 after being merged into a main line of the first air supply line 25 upstream of the third electrically operated isolation valve assemblies 26. The start end of the second air supply line 27 is connected to the normal compressed air system, the end of the second air supply line 27 is connected to the main line of the first air supply line 25, the second air supply line 27 is provided with a first check valve 28, and the first check valve 28 is located upstream of the compressed air storage tank 24.
Medium-pressure safety injection subsystem
The medium-pressure safety injection subsystem comprises a built-in refueling water tank 31, a medium-pressure safety injection pump 32 and a second injection pipeline 30, the starting end of the second injection pipeline 30 is connected with the built-in refueling water tank 31, the tail end of the second injection pipeline 30 is connected with three loop injection pipelines of the reactor coolant system, and the medium-pressure safety injection pump 32 is arranged on the second injection pipeline 30; the outlet of the built-in refueling water tank 31 is connected with the inlet of a medium-pressure safety injection pump 32, the outlet of the medium-pressure safety injection pump 32 is connected with three loop injection pipelines of a reactor coolant system through a second injection pipeline 30, and is connected with a cold pipe section of the pressure vessel 1 through the three loop injection pipelines 30. The three loop injection lines are a one loop injection line, a two loop injection line, and a three loop injection line, respectively. The medium pressure safety injection pump 32 takes water from the internal refueling water tank 31, injects the water into the reactor core through three loops of the reactor coolant system, and finally injects the water into the reactor core through the cold leg of the pressure vessel 1.
The medium-pressure safety injection subsystem comprises at least two second injection pipelines 30 connected in parallel, and each second injection pipeline 30 is provided with a medium-pressure safety injection pump 32; the end of each second injection line 30 is connected to a loop injection line, a second loop injection line, and a third loop injection line, respectively, or the end of each second injection line 30 is combined into a mother line and then connected to a loop injection line, a second loop injection line, and a third loop injection line.
The medium-pressure safety injection subsystem at least comprises two medium-pressure safety injection pumps 32, all the medium-pressure safety injection pumps 32 are started immediately after an SGTR accident, cooling water is injected into a cold pipe section of the pressure container 1, primary side secondary side leakage after the accident is compensated, and normal water filling quantity of a reactor coolant system is maintained.
Optionally, as shown in fig. 2, the medium-pressure safety injection subsystem includes two parallel second injection lines 30, and each second injection line 30 is provided with a medium-pressure safety injection pump 32; the ends of each second injection line 30 are combined into a mother line and then connected to a loop injection line, a second loop injection line, and a third loop injection line.
Blowdown subsystem
The blowdown subsystem comprises a fourth electrically-operated isolation valve assembly 41, a second check valve 42, a fifth electrically-operated isolation valve assembly 43, a bubbler 44 and a second discharge pipeline 40, wherein the bubbler 44 is arranged in the built-in refueling water tank 31, the bubbler 44 is connected with the steam generator 2 through the second discharge pipeline 40, the fourth electrically-operated isolation valve assembly 41, the second check valve 42 and the fifth electrically-operated isolation valve assembly 43 are sequentially arranged on the second discharge pipeline 40 in series, the fourth electrically-operated isolation valve assembly 41 is located at the upstream of the second check valve 42, and the second check valve 42 is located at the upstream of the fifth electrically-operated isolation valve assembly 43. The fourth electrically powered isolation valve assembly 41 includes at least two parallel rows of normally closed electrically powered isolation valves, each row of normally closed electrically powered isolation valves being powered by a different power source. The water in the steam generator 2 is discharged into the built-in refueling water tank 31 through the second discharge line 40, through the fourth electrically operated isolation valve assembly 41, the second check valve 42, and the fifth electrically operated isolation valve assembly 43, through the bubbler 44.
Each steam generator 1 comprises a second discharge pipeline 40, and after an SGTR accident, water in the steam generator 2 is discharged into the built-in refueling water tank 31 through the bubbler 44 by opening the normally closed electric isolation valve connected in parallel on the second discharge pipeline 40 according to the accident handling requirement, so that the water level of the steam generator 2 is reduced, and the steam generator 2 is prevented from overflowing.
Optionally, as shown in fig. 2, the blowdown subsystem includes a second discharge line 40, the bubbler 44 is disposed in the built-in refueling water tank 31, the bubbler 44 is connected to the steam generator 2 through the second discharge line 40, a fourth electrically-operated isolation valve assembly 41, a second check valve 42 and a fifth electrically-operated isolation valve assembly 43 are sequentially disposed on the second discharge line 40 in series from a start end of the second discharge line 40, and the fourth electrically-operated isolation valve assembly 41 includes two parallel normally-closed electrically-operated isolation valves.
The working principle of the system for preventing the overflow of the steam generator provided by the invention is as follows:
after the SGTR accident appears, this moment trigger the safety injection signal through stabiliser water level signal and steam generator liquid level signal and make the reactor scram, reduce reactor core power, the safety injection signal still can supply water to steam generator with the supplementary feedwater pump on the step-by-step regulation subsystem of automatic start auxiliary water supply, the well pressure safety injection pump automatic start on the well pressure safety injection subsystem simultaneously, provide the moisturizing to one loop, because well pressure safety injection pump injection pressure head is less than the pressure of one loop of accident initial stage, and there is not the actual flow of pouring into to one loop this moment, the safety injection signal still can trigger the quick cooling subsystem of steam generator secondary side to put into operation simultaneously, carry out rapid cooling step-down to one loop, reduce the leakage of steam generator's primary side direction secondary side.
The secondary side of steam generator passes through supplementary feedwater step adjustment subsystem automatically regulated steam generator liquid level this moment, when the steam generator liquid level is high, adjusts flow control valve to low flow gear, prevents that steam generator from taking place the overflow, when the steam generator liquid level is low, adjusts flow control valve to high flow gear, prevents that the steam generator liquid level from crossing excessively. The rapid cooling subsystem automatically adjusts the pressure value, discharges steam through the atmospheric discharge valve, and derives the heat of the reactor core. Under the coordination of the steam generator auxiliary water supply stepping adjustment subsystem and the rapid cooling subsystem, the temperature and the pressure of the primary loop are rapidly reduced. When the pressure of a loop is reduced to the injection pressure head of the medium-pressure safety injection pump, the medium-pressure safety injection pump supplements water to the loop to compensate the shrinkage of the water volume caused by the cooling of the loop and the leakage amount of the primary side secondary side of the steam generator. Before the pressure of the primary side of the steam generator is balanced with the pressure of the secondary side of the steam generator, the primary side can continuously leak to the secondary side, when the liquid level of the fault steam generator is high, a power plant operator opens an electric isolation valve assembly of a discharge pipeline on a pollution discharge subsystem according to judgment, liquid in the fault steam generator is discharged into a refueling water tank arranged in a containment, and the liquid is prevented from being released out of the containment.
After the SGTR accident, through a return circuit coolant of middling pressure ann notes subsystem compensation, the cooperation of steam generator supplementary feedwater step-by-step regulation subsystem and quick cooling subsystem reduces a return circuit temperature and pressure fast, simultaneously through blowdown subsystem's emission, prevents that trouble steam generator from taking place the overfilling for steam generator once inclines and secondary side pressure is balanced fast, and the breach flow stops.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (16)
1. A system for preventing overfilling of a steam generator, said system comprising: the system comprises a pressure container (1), a steam generator (2), a main pump (3), an auxiliary water supply stepping adjusting subsystem, a rapid cooling subsystem, a medium-pressure safety injection subsystem and a sewage disposal subsystem;
the steam generator (2) is connected with the pressure vessel (1) through a heat pipe section, the main pump (3) is connected with the pressure vessel (1) through a cold pipe section, the main pump (3) is connected with the steam generator (2) through a transition section pipeline,
the auxiliary water supply stepping adjusting subsystem comprises an auxiliary water supply storage tank (11), an auxiliary water supply pump (12) and a first injection pipeline (10), wherein the auxiliary water supply storage tank (11) is connected with a main water supply pipeline (4) of the steam generator (2) through the first injection pipeline (10) and the auxiliary water supply pump (12);
the rapid cooling subsystem comprises a silencer (21) and a first discharge pipeline (20), wherein the silencer (21) is connected with a main steam pipeline (5) of the steam generator (2) through the first discharge pipeline (20);
the medium-pressure safety injection subsystem comprises a built-in refueling water tank (31), a medium-pressure safety injection pump (32) and a second injection pipeline (30), wherein the built-in refueling water tank (31) is connected with three loop injection pipelines of a reactor coolant system through the second injection pipeline (30) and the medium-pressure safety injection pump (32) and is connected with a cold pipe section of the pressure container (1) through the three loop injection pipelines;
the blowdown subsystem comprises a bubbler (44) and a second discharge pipeline (40), the bubbler (44) is arranged in the built-in refueling water tank (31), and the bubbler (44) is connected with the steam generator (2) through the second discharge pipeline (40).
2. A steam generator overfill prevention system according to claim 1, wherein said secondary feedwater step adjustment subsystem further comprises a flow control valve (13), the flow control valve (13) being arranged on the first injection line (10) between the secondary feedwater pump (12) and the main feedwater conduit (4) of the steam generator (2).
3. A steam generator overfill prevention system according to claim 2, wherein the auxiliary feed water step adjustment subsystem further comprises a first electrically operated isolation valve assembly (14), the first electrically operated isolation valve assembly (14) being provided on the first injection line (10) between the auxiliary feed water pump (12) and the main feed water pipe (4) of the steam generator (2) downstream of the flow regulating valve (13).
4. A steam generator overfill prevention system according to claim 3, wherein said first electrically powered isolation valve assembly (14) comprises at least two first electrically powered valves in series.
5. The system for preventing the overflow of the steam generator according to claim 4, wherein the auxiliary water supply step adjustment subsystem comprises at least two first injection lines (10) connected in parallel, each first injection line (10) is provided with an auxiliary water supply pump (12), a flow regulating valve (13) and a first electric isolation valve assembly (14) in series, the auxiliary water supply pump (12) is positioned at the upstream of the flow regulating valve (13), and the flow regulating valve (13) is positioned at the upstream of the first electric isolation valve assembly (14); the initial end of each first injection pipeline (10) is respectively connected with an auxiliary feed water storage tank (11) or the initial ends of the first injection pipelines (10) are combined and then connected with the auxiliary feed water storage tank (11).
6. A steam generator overfill prevention system according to claim 1, wherein said rapid cooling subsystem further comprises an atmospheric vent valve (23) and a second electrically-operated isolation valve assembly (22), the atmospheric vent valve (23) and the second electrically-operated isolation valve assembly (22) being sequentially disposed in series on the first vent line (20), and the second electrically-operated isolation valve assembly (22) being located upstream of the atmospheric vent valve (23).
7. A steam generator overfill prevention system according to claim 6, wherein said atmospheric vent valve (23) is a remotely controlled pneumatic regulator valve.
8. The system of claim 6, wherein the rapid cooling subsystem further comprises a compressed air storage tank (24) and a first air supply line (25), the compressed air storage tank (24) being connected to the atmospheric vent valve (23) through the first air supply line (25).
9. The steam generator overfill prevention system of claim 8, wherein the rapid cooling subsystem further comprises a third electrically-operated isolation valve assembly (26), the third electrically-operated isolation valve assembly (26) being disposed on the first air supply line (25) between the compressed air storage tank (24) and the atmospheric vent valve (23).
10. The system of claim 9, wherein the rapid cooling subsystem further comprises a compressed air system and a second air supply line (27), the normal compressed air system being connected to the first air supply line (25) through the second air supply line (27), and the second air supply line (27) being connected to the first air supply line (25) upstream of the third electrically-operated isolation valve assembly (26).
11. The steam generator overfill prevention system of claim 10, wherein the rapid cooling subsystem further comprises a first check valve (28), the first check valve (28) disposed on the second air supply line (27) between the normal compressed air system and the third electrically-operated isolation valve assembly (26) and upstream of the compressed air storage tank (24).
12. A steam generator overfill prevention system according to claim 11, wherein said rapid cooling subsystem comprises at least two parallel first drain lines (20), each first drain line (20) having a second electrically-operated isolation valve assembly (22) and an atmospheric drain valve (23) disposed in series, in that order, with the second electrically-operated isolation valve assembly (22) being upstream of the atmospheric drain valve (23); the tail end of each first discharge pipeline (20) is respectively connected with a silencer (21) or the tail ends of each first discharge pipeline (20) are combined and then connected with a silencer (21).
13. A system for preventing steam generator flooding according to claim 12 wherein the atmospheric vent valve (23) of each first vent line (20) of the rapid cooling subsystem is connected to a compressed air storage tank (24) via a respective first air supply line (25), and the beginning of each first air supply line (25) is connected to a respective compressed air storage tank (24) or the beginning of each first air supply line (25) is combined and then connected to a compressed air storage tank (24).
14. A steam generator overfill prevention system according to claim 1, wherein said blowdown subsystem further comprises a fourth electrically powered isolation valve assembly (41), a second check valve (42), and a fifth electrically powered isolation valve assembly (43), the fourth electrically powered isolation valve assembly (41), the second check valve (42), and the fifth electrically powered isolation valve assembly (43) being sequentially disposed in series on the second drain line (40), and the second check valve (42) being upstream of the fifth electrically powered isolation valve assembly (43), the fourth electrically powered isolation valve assembly (41) being upstream of the second check valve (42).
15. A steam generator overfill prevention system according to claim 14, wherein said fourth electrically powered isolation valve assembly (41) comprises at least two parallel rows of normally closed electrically powered isolation valves, each row of normally closed electrically powered isolation valves being respectively powered by a different power source.
16. The system for preventing steam generator overfill according to claim 1, wherein said medium pressure safety injection subsystem comprises at least two second drain lines (40) connected in parallel, each second drain line (40) having a medium pressure safety injection pump (32) disposed thereon; the tail end of each second injection pipeline (30) is respectively connected with a loop injection pipeline, a second loop injection pipeline and a third loop injection pipeline, or the tail ends of the second injection pipelines (30) are combined into a mother pipeline and then connected with the loop injection pipeline, the second loop injection pipeline and the third loop injection pipeline.
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| CN202110538581.4A CN113421661A (en) | 2021-05-18 | 2021-05-18 | System for preventing steam generator from overflowing |
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