CN104879737B - Steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station - Google Patents
Steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station Download PDFInfo
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- CN104879737B CN104879737B CN201510259985.4A CN201510259985A CN104879737B CN 104879737 B CN104879737 B CN 104879737B CN 201510259985 A CN201510259985 A CN 201510259985A CN 104879737 B CN104879737 B CN 104879737B
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Abstract
The present invention relates to technical field of nuclear power, it provides steam generator secondary side partition method in a kind of kilowatt pressurized water reactor nuclear power station, comprising the following steps: main steam system blocks step: will be blocked at the steam (vapor) outlet current limiter between steam generator and main steam system；Water supply system blocks step: being sealed and is isolated with injection water in the connecting pipe of steam generator to main feed system；It is sealed and is isolated with injection water in the connecting pipe of steam generator to auxiliary feedwater system；Drainage blocks step: will block at the current limiter in the drainage connecting with steam generator；Valve closes step: the boundary valve penetrated through with steam generator secondary side is all closed.In the present invention, through the above steps, guarantee the good air-tightness of steam generator secondary side, realizes that steam generator secondary side is completely isolated.
Description
Technical field
The present invention relates to technical field of nuclear power, are to be related to steam in kilowatt pressurized water reactor nuclear power station more specifically
Generator secondary side partition method.
Background technique
Nuclear steam generator SG (steam generator) be three big equipment in million kilowatt presurized water reactor nuclear island it
One, it is the boundary of PWR nuclear power plant primary Ioops, secondary circuit, the heat transfer that it generates reactor is secondary to steam generator
The steam of side, generation pushes steam turbine generator power generation after I and II steam-water separator is dry.Steam generator with react stacking pressure
Force container is connected, and not only directly affects the power and efficiency in power station, but also when carrying out heat exchange, also play barrier radioactivity
The effect of catalyst carrier, it is most important to nuclear plant safety.
Specifically, in pressurized-water reactor nuclear power plant, steam generator by the heat in primary Ioops coolant be transmitted to secondary circuit to
Water makes it generate the power device in saturated vapor supply secondary circuit.On each loop be equipped with a steam generator, every
Capacity is designed according to the heat output of reactor for transmitting one third when Operation at full power.It is set as connection primary Ioops and secondary circuit
Standby, steam generator constitutes the second protective barrier for preventing radioactivity from leaking between two circuits.It is living after being irradiated due to water
Change and fuel can damaged may leak on a small quantity, cooling flow of primary Ioops for flowing through reactor core has radioactivity, and compressed water reactor nuclear power
Secondary circuit equipment of standing cannot be by radioactive pollution, and the tube sheet of steam generator and inverted U-tube are reactor coolants
The component part of pressure boundary belongs to one of second radioactivity protection barrier.
Currently used for nuclear power station steam generator contour structures as shown in Figure 1, its by lower member (evaporator section) and upper
Portion's component (steam-water separation section) two large divisions composition.Lower member mainly has: lower head, tube sheet, lower part shell ring, U-shaped heat-transfer pipe,
Restrain sleeve, supporting clapboard etc.；Upper component mainly has: primary separator, second-stage separator, water supply endless tube, current limiter, upper envelope
Head and top shell ring etc..The primary side of steam generator is exactly to enter steam generation from the coolant that reactor pressure vessel comes
That sidepiece part flowed through after device, that is, correspond to above-mentioned lower member；Secondary side is exactly to be heated and generate in water supply loop
That sidepiece part of steam, that is, correspond to above-mentioned upper component.But tube sheet and heat-transfer pipe are primary side on one side, another side is two
Secondary side.For nuclear safety classification, the component of primary side belongs to 1 grade of nuclear safety, and the component of secondary side belongs to 2 grades of nuclear safety.
According to the requirement of French specification RST-M97 editions (2000), nuclear power unit must be implemented to steam in each Ten-year outage
The test of 100% helium mass spectrum leak detection of vapour generator heat-transfer pipe.The test carries out after Primary hydraulic test, with primary Ioops water
Pressure test, the full eddy current inspection of steam generator heat-transfer pipe form an entirety, grasp the health of steam generator heat-transfer pipe comprehensively
Situation, this is conducive to the safe operation of unit.During operation, when primary side of steam generator is more than to the slip of secondary side
5L/H, it is necessary to carry out helium test for leak.
Steam generator heat-transfer pipe helium mass spectrum leak detection is search gas-helium to be filled with to steam generator secondary side, and protect
The pressure of 6bar is held, there may be leakage channels to enter primary side so that helium is by heat-transfer pipe, will show in the other side of inner wall
Track gas collection gets up, and is detected using helium mass analyzer, to determine the presence and size of leakage.
In helium mass spectrum leak detection test, after the cleaning, emptying of first and second side of completion, need steam generator
Secondary side is isolated, to avoid the gas loss being filled in follow-up test.Steam generator secondary side bounds are larger,
(bypass is arranged with VVP (main steam system), ARE (main feed system), ASG (auxiliary feedwater system), APG (drainage), GCT
Place system), REN (core sampling system), SIR (chemical reagent injecting systems) be connected, the steam generator secondary side master of standard
Isolation is unable to satisfy the requirement of leakproofness, especially ARE, ASG, APG and VVP system.Steam generator secondary side isolation boundary
Leakproofness be the key that helium mass spectrum leak detection test, if steam generator secondary side is not able to maintain the pressure of 6bar, helium mass spectrum
Leak test can not be implemented.The valve in each channel that existing isolation method is connected to generally by closing with steam generator,
Steam generator is isolated, but the isolation effect of such method is not poor air-tightness, to subsequent test result very well
Accuracy and sensitivity tool have a certain impact, therefore need to find the new partition method of one kind to solve the problems, such as this.
Summary of the invention
The purpose of the present invention is to provide steam generator secondary sides in a kind of kilowatt pressurized water reactor nuclear power station to be isolated
Method, it is intended to solve the problems, such as that steam generator secondary side poor air-tightness existing in the prior art, isolation effect are bad.
In order to solve the above technical problems, the technical scheme is that providing a kind of kilowatt pressurized water reactor nuclear power station
Middle steam generator secondary side partition method, comprising the following steps:
Main steam system blocks step: will seal at the steam (vapor) outlet current limiter between steam generator and main steam system
It is stifled；
Water supply system blocks step: and inject water into the connecting pipe of main feed system and steam generator and be sealed
Isolation；And it is sealed and is isolated with injection water in the connecting pipe of steam generator to auxiliary feedwater system；
Drainage blocks step: will block at the current limiter in the drainage connecting with steam generator；Valve
Door closes step: the boundary valve penetrated through with steam generator secondary side is all closed.
Optionally, it blocks in step in the main steam system, is blocked using guillotine to the steam (vapor) outlet current limiter
It is blocked.
Optionally, when being blocked using guillotine blocking, guillotine is filled in into the steaming at the top of steam generator
In vapour deflector hole.
Optionally, after guillotine being filled in the steam deflector hole at the top of steam generator, it is ensured that guillotine blocking is flat
The sealing ring and steam deflector hole inner wall and inletpiston in face are completely attached to and are compressed.
Optionally, water supply system blocks in step, injects into the connecting pipe of main feed system and steam generator
When water is sealed isolation, injection water is introduced into horizontal pipe, enters back into vertical pipeline, and reaches first in advance in vertical pipeline
If height of water level；Into the connecting pipe of auxiliary feedwater system and steam generator inject water be sealed be isolated when, injection
Water is introduced into horizontal pipe, enters back into vertical pipeline, and reaches the second preset water level height in vertical pipeline.
Optionally, it is blocked in step in water supply system, water level in the vertical pipeline of main feed system is monitored, water is worked as
When position is lower than the first preset water level height, water is injected until reaching the first preset water level height into the horizontal pipe of main feed system
Degree；Water level in the vertical pipeline of auxiliary feedwater system is monitored, when water level is lower than the second preset water level height, to auxiliary
Water is injected in the horizontal pipe of water supply system until reaching the first preset water level height.
Optionally, it is blocked in step in water supply system, the first level sensor is set in the vertical pipeline of main feed system
Device utilizes the water level in first water level sensor monitoring vertical pipeline；It is arranged in the vertical pipeline of auxiliary feedwater system
Second water level sensor utilizes the water level in second water level sensor monitoring vertical pipeline.
Optionally, it blocks in step in drainage, the current limiter in drainage is blocked using blocking.It is optional
Ground blocks in step in drainage, replaces the current limiter using blank flange and is blocked.Optionally, in drainage
It blocks in step, the current limiter is replaced using end socket, pipe cap or plug and is blocked.In the present invention, through the above steps, protect
The good air-tightness of steam generator secondary side is demonstrate,proved, realizes steam generator secondary side in kilowatt pressurized water reactor nuclear power station
It is completely isolated.
Detailed description of the invention
Fig. 1 is the connection of steam generator and main feed system and auxiliary feedwater system in nuclear power station in the embodiment of the present invention
Schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or it may be simultaneously present centering elements.When an element referred to as " is connected to " another element, it can be with
It is directly to another element or may be simultaneously present centering elements.
It should also be noted that, the positional terms such as left and right, upper and lower in the present embodiment, be only each other relative concept or
It is reference with the normal operating condition of product, and should not be regarded as restrictive.
Steam generator secondary side partition method in nuclear power station provided by the invention the following steps are included:
Main steam system blocks step；
Water supply system blocks step；
Drainage blocks step；
Valve closes step.
Without sequencing between above steps, can also carry out simultaneously.
Step is blocked in main steam system, mainly by the steam (vapor) outlet current limliting between steam generator and main steam system
It is blocked at device.Specifically, the function of main steam system is that the steam for generating steam generator is sent to main steam turbine and its auxiliary
Equipment (such as steam turbine gland system, condenser and separator, steam by-pass system, auxiliary feed water pump steam turbine
Deng).Main steam system is connected with a steam generator outlet respectively by three main steam pipes, every root canal line.And in steam
It is equipped with steam (vapor) outlet current limiter between generator and main steam system, this is arranged between the two logical using dedicated be blocked in
Road is blocked.
Preferably, dedicated blocking is that guillotine blocks.When being blocked using guillotine blocking, guillotine is filled in into steaming
In steam deflector hole at the top of vapour generator, and ensure sealing ring and steam deflector hole inner wall and the import of guillotine blocking plane
Plane is completely attached to and is compressed, in this way, just can guarantee the solid and reliable of guillotine blocking installation.
Specifically, when the blocking of installation guillotine, it is necessary first to remove the drier at the top of steam generator secondary side, then
Cover board is set on U-Shaped Tube for PWR Steam Generator overhead vapor outlet tube sheet upper berth, prevents foreign matter from falling into inside；And check steam generator
Whether overhead vapor deflector hole plane smooth, check deflector hole inside whether have penetrability scratch, check deflector hole inside whether
There is burn into foreign matter, is cleared up in time if necessary；Then check whether the attachment of guillotine blocking is complete, and guillotine is stifled
Whether plug seal rubber column surface has scratch, then fills in guillotine in the steam deflector hole at the top of steam generator.
It needs to stop after its clockwise is rotated multi-turn using special spanner during installation.Seven water conservancy diversion are shared at the top of steam generator
Hole, the guillotine blocking installation method at each deflector hole are same as above.
When steam generator helium mass spectrum leak detection after the test, need to remove guillotine blocking, at this point, depleted of steam first
Generator interior media prevents from suffocating when disassembly, dismantle with oxygen content inside oxygen table monitoring steam generator before working
It needs to buttress guillotine blocking in the process, in order to avoid guillotine blocking is fallen, be checked after guillotine blocking is removed in guillotine blocking
Whether attachment has missing.Seven guillotine blockings at the top of steam generator are all removed according to same method.
Block in step in above-mentioned water supply system: the valve between main feed system and steam generator is non-return valve, inverse
Only valve is automatically closed, and is sealed and is isolated with injection water in the connecting pipe of steam generator to main feed system after closing；Together
When, the non-return valve between auxiliary feedwater system and steam generator is also automatically closed, to auxiliary feedwater system and steam generator
Connecting pipe in injection water be sealed isolation.This is because main feed system, auxiliary feedwater system and steam generator it
Between the valve that is arranged be non-return valve, so good sealing effect cannot be reached only by the mode for closing non-return valve, because
This needs to combine water-stop.Fig. 1 is the connection schematic diagram of steam generator 10 and main feed system 20 and auxiliary feedwater system 30.
The connecting pipe 40 that main feed system 20 and auxiliary feedwater system 30 lead to steam generator 10 includes two sections: with steam generation
The vertical pipeline 41 that device 10 is directly connected to and the horizontal pipe 42 being connected with vertical pipeline 41, and on each horizontal pipe 42 respectively
Equipped with a water inlet 421, can be injected water by way of water service pipe at two water inlets 421 scene.To main water supply
System 20 in the connecting pipe 40 of steam generator 10 inject water be sealed be isolated when, injection water be introduced into horizontal pipe
42, vertical pipeline is entered back into, and reach the first preset water level height in vertical pipeline；It is sent out to auxiliary feedwater system and steam
When injection water is sealed isolation in the connecting pipe of raw device, injection water is introduced into horizontal pipe 42, enters back into vertical pipeline 41,
And reach the second preset water level height in vertical pipeline 41.Herein, the first preset water level height and the second preset water level height
It can be the same or different, preset water level actual height can be determined by the actual situation.
Further, since the leakproofness of pipe downstream valve is not especially good, in injection connecting pipe 40 water possibility
It can slowly be oozed out with the extension of time, therefore water level monitoring system is set in connecting pipe 40, it is main to water system when monitoring
When water level is lower than the first preset water level height in the vertical pipeline 41 of system 20, then infused into the horizontal pipe 42 of main feed system 20
Enter water until reaching the first preset water level height；It, can be with if water level is maintained at the first preset water level height or is higher than this height
Without water filling；Likewise, water level in the vertical pipeline 41 of auxiliary feedwater system 30 is monitored using water level monitoring system, when
When water level is lower than the second preset water level height, water is injected into the horizontal pipe 42 of auxiliary feedwater system and is preset until reaching first
Height of water level can not have to water filling if water level is maintained at the second preset water level height or is higher than this height.
Specifically, water level monitoring system includes the first level sensor being arranged in the vertical pipeline 41 of main feed system 20
Device (not shown) utilizes the water level in the first water level sensor monitoring vertical pipeline 41；Water level monitoring system further includes setting
It sets and the second water level sensor (not shown) is set in the vertical pipeline 41 of auxiliary feedwater system 30, passed using the second water level
Sensor monitors the water level in vertical pipeline 41.Water level monitoring system can also include passing with the first water level sensor and the second water level
The alarm system of sensor connection, prompts operator to carry out water flood operations using alarm system；Alternatively, by the first level sensor
Device and the second water level sensor are connect with a controller respectively, and controllable injection switches on-off the controller simultaneously, in this way, working as
When water level is lower than preset water level height, signal is fed back to controller respectively by the first water level sensor or the second water level sensor,
Water filling switch is opened and is filled the water by controller.
It blocks in step in drainage: will mainly be sealed at the current limiter in the drainage being connect with steam generator
It is stifled.Specifically, current limiter is restricting orifice.Preferably, it is blocked using blank flange replacement restricting orifice.Blank flange is
Intermediate non-porous totally enclosed flange can play isolation, cutting action well.And blank flange good seal performance, for needing
Completely isolated system is wanted, can be used as reliable isolating means.Certainly, using other method for blocking, blocking pair is such as directlyed adopt
Current limiter is blocked, or is blocked also using the substitution blank flange such as end socket, pipe cap, welding plug in guarantor of the invention
Within the scope of shield.
Step is closed in valve: the boundary valve penetrated through with steam generator secondary side is all closed.Specifically further include
It is all closed with the boundary valve of GCT (bypass discharge leg system), REN (core sampling system) and SIR (chemical reagent injecting systems).
By the operation of above steps, guarantee the good air-tightness of steam generator secondary side, realizes steam generator
Secondary side is completely isolated.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (7)
1. steam generator secondary side partition method in a kind of kilowatt pressurized water reactor nuclear power station, which is characterized in that including with
Lower step:
Main steam system blocks step: will block at the steam (vapor) outlet current limiter between steam generator and main steam system；
Water supply system blocks step: being sealed and is isolated with injection water in the connecting pipe of steam generator to main feed system；
And it is sealed and is isolated with injection water in the connecting pipe of steam generator to auxiliary feedwater system；
Drainage blocks step: will block at the current limiter in the drainage connecting with steam generator；Valve closes
It closes step: the boundary valve penetrated through with steam generator secondary side is all closed；
It is blocked in step in water supply system, connecting pipe includes: horizontal pipe and vertical pipeline, is sent out to main feed system and steam
When injection water is sealed isolation in the connecting pipe of raw device, injection water is introduced into horizontal pipe, enters back into vertical pipeline, and
Reach the first preset water level height in vertical pipeline；Water is being injected into the connecting pipe of auxiliary feedwater system and steam generator
When being sealed isolation, injection water is introduced into horizontal pipe, enters back into vertical pipeline, and reaches second in vertical pipeline and preset
Height of water level；
It is blocked in step in water supply system, the first water level sensor is set in the vertical pipeline of main feed system, using described
First water level sensor monitors the water level in vertical pipeline, when water level is lower than the first preset water level height, to main feed system
Horizontal pipe in injection water until reach the first preset water level height；It is arranged second in the vertical pipeline of auxiliary feedwater system
Water level sensor, using the water level in second water level sensor monitoring vertical pipeline, when water level is lower than the second preset water level
When height, water is injected until reaching the first preset water level height into the horizontal pipe of auxiliary feedwater system；
First water level sensor and the second water level sensor are electrically connected with alarm system.
2. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as described in claim 1, special
Sign is, blocks in step in the main steam system, is blocked using guillotine blocking to the steam (vapor) outlet current limiter.
3. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as claimed in claim 2, special
Sign is, when being blocked using guillotine blocking, guillotine is filled in the steam deflector hole at the top of steam generator
In.
4. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as claimed in claim 3, special
Sign is, after guillotine is filled in the steam deflector hole at the top of steam generator, it is ensured that the sealing of guillotine blocking plane
Ring and steam deflector hole inner wall and inletpiston are completely attached to and are compressed.
5. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as described in claim 1, special
Sign is, blocks in step in drainage, is blocked using blocking to the current limiter in drainage.
6. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as described in claim 1, special
Sign is, blocks in step in drainage, replaces the current limiter using blank flange and is blocked.
7. steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station as described in claim 1, special
Sign is, blocks in step in drainage, replaces the current limiter using end socket, pipe cap or plug and is blocked.
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| CN201510259985.4A CN104879737B (en) | 2015-05-20 | 2015-05-20 | Steam generator secondary side partition method in kilowatt pressurized water reactor nuclear power station |
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| CN107289436A (en) * | 2016-03-31 | 2017-10-24 | 华北电力大学 | It is a kind of that there is the support flow-guiding structure for improving steam generator heat exchange efficiency |
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| JPS5895239A (en) * | 1981-12-01 | 1983-06-06 | Toshiba Corp | Monitoring device for leakage of valve |
| EP0146305A2 (en) * | 1983-12-19 | 1985-06-26 | The Babcock & Wilcox Company | Controlling leaks between primary and secondary circuits of a steam generator of a pressurised water reactor system |
| CN202736508U (en) * | 2012-08-22 | 2013-02-13 | 中广核工程有限公司 | Emergency water injection system of secondary side of nuclear power plant |
-
2015
- 2015-05-20 CN CN201510259985.4A patent/CN104879737B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5895239A (en) * | 1981-12-01 | 1983-06-06 | Toshiba Corp | Monitoring device for leakage of valve |
| EP0146305A2 (en) * | 1983-12-19 | 1985-06-26 | The Babcock & Wilcox Company | Controlling leaks between primary and secondary circuits of a steam generator of a pressurised water reactor system |
| CN202736508U (en) * | 2012-08-22 | 2013-02-13 | 中广核工程有限公司 | Emergency water injection system of secondary side of nuclear power plant |
Non-Patent Citations (1)
| Title |
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| 氦质谱检漏技术在蒸发器制造与停堆期间的应用;李光伟，李宏艳;《科技创新与应用》;20131231(第12期);第23-24页 * |
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