CN105139902A - Nuclear-power-plant improved type medium-pressure safety injection system - Google Patents
Nuclear-power-plant improved type medium-pressure safety injection system Download PDFInfo
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- CN105139902A CN105139902A CN201510378319.2A CN201510378319A CN105139902A CN 105139902 A CN105139902 A CN 105139902A CN 201510378319 A CN201510378319 A CN 201510378319A CN 105139902 A CN105139902 A CN 105139902A
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- pipeline
- safety injection
- injection system
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- power plant
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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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- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention relates to a nuclear-power-plant improved type medium-pressure safety injection system. The system is composed of two safety injection boxes, corresponding connecting pipelines, injection pipelines and a serial of valves. The two safety injection boxes are both connected with a nuclear-power-plant reactor coolant system via the connecting pipelines and the injection pipelines, each connecting pipeline is provided with two electric isolating valves and two inverted valves, and the electric isolating valves and the inverted valves are in serial connection. A communication pipeline is arranged between two positions, adjacent to the bottoms of the corresponding safety injection boxes, respectively on the two connecting pipelines, and is provided with an electric isolating valve. Each injection pipeline is provided with a detector used for detecting a broken port on the injection pipelines. The electric isolating valves on the two connecting pipelines are at an opening state when running is normal, and the electric isolating valve on the communication pipeline is at a closing state when running is normal. The system possesses relatively high value on safety and economy of a nuclear power plant.
Description
Technical field
The present invention relates to nuclear power technology, be specifically related to a kind of nuclear reactor safety injection system.
Background technology
In nuclear power plant's engineered safeguards features, very important one is exactly safety injection system.One of them function of safety injection system is to reactor core water filling, again to flood and to cool reactor core, and the rising of fuel limitation component temperature.Peace note case (being generally a part for middle pressure safety injection system) is as a kind of non-active injection means, can after there is primary Ioops cut loss of-coolant accident (LOCA) in nuclear power plant, the cooling medium that quick compensation is lost, every platform peace note case provides and floods 50% of volume needed for reactor core.The no matter active or active nuclear power station of right and wrong, peace note case is all indispensable important peace water filling source and accident mitigation means.
In existing middle pressure safety injection system design, no matter be two loops or three-loop nuclear power plant, if there is cut (even reactor coolant loop generation cut) in the pipeline of connection peace note case and major loop, then the cooling medium of major loop is lost from cut, and the peace water filling of cut correspondence peace note case is lost, while increasing Core damage risk, leaving the time that operator carries out accident mitigation operation for also shortens relatively.
The present invention has higher value to the security and economy that improve nuclear power plant.
Summary of the invention
The object of the invention is to the needs for nuclear plant safety design, there is provided in a kind of modified and press safety injection system, when there is peace note case injection pipeline cut accident or major loop cut accident in nuclear power plant, reduce or avoid pacifying the loss waste of water filling, strengthen the relief capabilities of nuclear power plant's reply loss of-coolant accident (LOCA), improve the security of nuclear power plant.
Technical scheme of the present invention is as follows:
Press safety injection system in a kind of nuclear power plant modified, the associated line of pacifying to note casees and correspondence thereof by two, injection pipeline and connecting pipeline and a series of valve form.
Further, press safety injection system in a kind of nuclear power plant as above modified, two peace note casees are connected on nuclear power plant's reactor coolant loop respectively by associated line, injection pipeline.Every bar associated line is respectively arranged with 2 motor-operated isolation valve and 2 non-return valve of series connection.
Further, in a kind of nuclear power plant as above modified, press safety injection system, note between the position bottom case near peace at two associated lines, be provided with connecting pipeline.Connecting pipeline is provided with a motor-operated isolation valve.
Further, press safety injection system in a kind of nuclear power plant as above modified, every bar injects pipeline and is provided with detector, for detecting the cut injected on pipeline.
Further, press safety injection system in a kind of nuclear power plant as above modified, be in opening when the motor-operated isolation valve on two associated lines normally runs, when the motor-operated isolation valve on connecting pipeline normally runs, be in closed condition.
Beneficial effect of the present invention is as follows: (1) system can when pacifying note case and injecting pipeline loss of-coolant accident (LOCA), corresponding pipeline is effectively avoided to pacify the loss pacifying water filling in note case, add the peace water injection rate entering reactor coolant loop, strengthen nuclear power plant and alleviate the ability that peace note case injects pipeline cut loss of-coolant accident (LOCA), enhance the security of nuclear power plant; (2) system robotization can realize the peace split stream of injected water that cut peace note case injects the isolation of pipeline, robotization realizes cut pipeline correspondence peace note case, can faster, more effective alleviations nuclear power plant peace note case injection pipeline cut loss of-coolant accident (LOCA); (3) improve in tradition and press safety injection system in the shortcoming running into peace note case water depletion when peace note case injects pipeline cut loss of-coolant accident (LOCA), be of value to and reduce Core damage frequency in nuclear power plant's probabilistic safety analysis; (4) when peace note case occurring and injecting pipeline cut loss of-coolant accident (LOCA), system can be injected from trend reactor pressure vessel and more pacify water filling, while raising npp safety, for operator's subsequent action provides more plenty of time, be conducive to reducing people because of failure probability; (5) the present invention is for two loop plants, and same thinking and countermeasure can be used for Three links theory (or other type) nuclear power plant, applicability and generalization stronger.
Accompanying drawing explanation
Fig. 1 presses safety injection system in tradition;
Fig. 2 is water filling schematic diagram when pressing safety injection system injection pipeline cut accident in tradition;
Fig. 3 presses safety injection system in modified of the present invention;
Fig. 4 is water filling schematic diagram when pressing safety injection system injection pipeline cut accident in modified of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Fig. 1 presses safety injection system in tradition.Two peace note casees 1 and 2 in Fig. 1 are connected on reactor coolant loop 13 respectively by associated line 3 and 4, injection pipeline 11 and 12.Associated line 3 and 4 there are respectively 1 motor-operated isolation valve and 2 non-return valve.
Fig. 2 is water filling schematic diagram when pressing safety injection system injection pipeline cut accident in tradition.As can be seen from the figure, when injecting pipeline 11 and cut 14 occurring, the peace water filling energy piii reactor coolant system 13 of peace note case 2, and the peace water filling of peace note case 1 will be run off from cut 14.In like manner, when injecting pipeline 12 and cut occurring, the peace water filling of peace note case 2 will be run off from cut.
Fig. 3 presses safety injection system in nuclear power plant of the present invention modified.With press compared with safety injection system in Fig. 1 tradition, press in modified and the associated line 3 and 4 of safety injection system respectively adds 1 often open motor-operated isolation valve 7 and 8, inject each increase by 1 cut detector assembly 13 and 14 on pipeline, add connecting pipeline 18 between associated line 3 and 4, connecting pipeline 18 has a normally closed motor-operated isolation valve 19.Often open motor-operated isolation valve 5 and 6, during normal shutdown, when primary Ioops absolute pressure is closed lower than during 7.0MPa, prevent peace note case from injecting boron water to reactor coolant loop.Often open motor-operated isolation valve 5 and 7,6 and 8 when accident conditions, can judge automatically to close according to signal.
Have boron water in peace note case 1 and 2, the nitrogen being about 4.2MPa by absolute pressure covers.When the pressure of reactor coolant loop drops to below peace note case pressure, by nitrogen pressure, boron water is injected into reactor pressure vessel descending branch, reactor core can be flooded at short notice, avoid fuel rod to melt.Each peace note case can provide and flood 50% of volume needed for reactor core.
As shown in Figure 4, when injecting pipeline 15 and cut occurring, first sniffer 13 detects the existence of cut, and often open motor-operated isolation valve 5 and 7 and automatically close, the normally closed motor-operated isolation valve 19 on connecting pipeline 18 is opened automatically.Peace water filling in the peace note case 1 that cut pipeline is corresponding can be injected into reactor coolant loop 17 by the injection pipeline 16 of peace note case 2 correspondence.In like manner, when injecting pipeline 16 and cut occurring, sniffer 14 detects the existence of cut, and often open motor-operated isolation valve 6 and 8 and automatically close, the normally closed motor-operated isolation valve 19 on connecting pipeline 18 is opened automatically.Peace water filling in the peace note case 2 that cut pipeline is corresponding can be injected into reactor coolant loop 17 by the injection pipeline 15 of peace note case 1 correspondence.Like this, no matter cut occurs in is injected pipeline 15 or 16, and the water of 2 peace note casees can be injected into reactor coolant loop, adds the injection rate IR of peace water filling when accident occurs.
Detector 13 and 14 on injection pipeline, for the detection of cut, can pass through accomplished in many ways.Wherein feasible way considers that the pressure at detector two ends is different from when normally running when injection pipeline 15 or 16 there being cut.During normal operation, the pressure of detector should basically identical with reactor coolant loop (being generally 15.5MPa).When cut occurs, the pressure at cut place can decline rapidly, causes this pipeline upward pressure to decline rapidly.Then can decline rapidly according to the detector pressure detecting certain one side, such as declining is greater than 6MPa, then close this pipeline, open the isolation valve 19 on connecting pipeline 18.
Be more than for cut occur in peace note case inject on pipeline time, to the explanation of pressing safety injection system embodiment to carry out in modified.When cut occurs on reactor coolant loop, also can use the thinking of the design, by the mode of pressing safety injection system to increase detector, motor-operated isolation valve and connecting pipeline in tradition, when increasing cut loss of-coolant accident (LOCA), pacify the peace water filling that note case injects.
The present invention carries out design for two loop plants (2 peace note casees) to improve and explanation.Identical for Three links theory (or other type) nuclear power plant's principle, also the mode to pressing safety injection system to increase detector, motor-operated isolation valve and associated line in tradition can be passed through, avoid injecting pipeline cut even reactor coolant loop cut loss of-coolant accident (LOCA) time, cut place correspondence peace note case pacifies the forfeiture of water filling, increases the security of nuclear power plant.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technology thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. press a safety injection system in nuclear power plant's modified, it is characterized in that:
Described system is made up of two associated lines of pacifying to note casees and correspondence thereof, injection pipelines and connecting pipelines and a series of valve.
2. press safety injection system in nuclear power plant as claimed in claim 1 modified, it is characterized in that:
Two peace note casees are connected on nuclear power plant's reactor coolant loop respectively by respective associated line and injection pipeline, and every bar associated line is respectively arranged with 2 motor-operated isolation valve and 2 non-return valve of series connection.
3. press safety injection system in nuclear power plant as claimed in claim 2 modified, it is characterized in that:
Note between the position bottom case near peace at two associated lines, be provided with described connecting pipeline, connecting pipeline is provided with a motor-operated isolation valve.
4. press safety injection system in the nuclear power plant's modified as described in claim 1-3 any one, it is characterized in that:
Every bar injects pipeline and is provided with detector, for detecting the cut injected on pipeline.
5. press safety injection system in nuclear power plant as claimed in claim 3 modified, it is characterized in that:
Article two, the motor-operated isolation valve on associated line is in opening when normally running, and is in closed condition when the motor-operated isolation valve on connecting pipeline normally runs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510378319.2A CN105139902B (en) | 2015-07-01 | 2015-07-01 | Safety injection system is pressed in a kind of nuclear power plant's modified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510378319.2A CN105139902B (en) | 2015-07-01 | 2015-07-01 | Safety injection system is pressed in a kind of nuclear power plant's modified |
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| Publication Number | Publication Date |
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| CN105139902A true CN105139902A (en) | 2015-12-09 |
| CN105139902B CN105139902B (en) | 2018-10-12 |
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Citations (9)
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| CN101847451A (en) * | 2009-06-19 | 2010-09-29 | 中广核工程有限公司 | Safety injection system |
| CN102034559A (en) * | 2010-09-19 | 2011-04-27 | 中广核工程有限公司 | Rapid mutual-backup system of nuclear power station and mutual-backup method thereof |
| US20120263268A1 (en) * | 2011-04-15 | 2012-10-18 | Korea Hydro And Nuclear Power Co., Ltd. | Passive high pressure safety injection tank system (hpsit) for responding to station blackout (sbo) and loss-of-coolant accidents (loca) |
| CN102903403A (en) * | 2012-09-27 | 2013-01-30 | 中国核电工程有限公司 | Active and non-active combined core water injection heat lead-out device |
| CN103578582A (en) * | 2012-08-03 | 2014-02-12 | 韩国原子力硏究院 | Hybrid safety injection tank system pressurized with safety valve of pressurizer |
| US20140050292A1 (en) * | 2012-08-16 | 2014-02-20 | Korea Atomic Energy Research Institute | Separate type safety injection tank and integral type reactor having the same |
| CN203596180U (en) * | 2013-09-06 | 2014-05-14 | 中国核电工程有限公司 | Emergency reactor core cooling system |
| CN103996418A (en) * | 2013-02-14 | 2014-08-20 | 韩国原子力研究院 | Multi stage safety injection device and passive safety injection system having the same |
| KR101463441B1 (en) * | 2013-05-31 | 2014-11-21 | 한국원자력연구원 | High concentration boron injection system and safety injection system having the same |
-
2015
- 2015-07-01 CN CN201510378319.2A patent/CN105139902B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847451A (en) * | 2009-06-19 | 2010-09-29 | 中广核工程有限公司 | Safety injection system |
| CN102034559A (en) * | 2010-09-19 | 2011-04-27 | 中广核工程有限公司 | Rapid mutual-backup system of nuclear power station and mutual-backup method thereof |
| US20120263268A1 (en) * | 2011-04-15 | 2012-10-18 | Korea Hydro And Nuclear Power Co., Ltd. | Passive high pressure safety injection tank system (hpsit) for responding to station blackout (sbo) and loss-of-coolant accidents (loca) |
| CN103578582A (en) * | 2012-08-03 | 2014-02-12 | 韩国原子力硏究院 | Hybrid safety injection tank system pressurized with safety valve of pressurizer |
| US20140050292A1 (en) * | 2012-08-16 | 2014-02-20 | Korea Atomic Energy Research Institute | Separate type safety injection tank and integral type reactor having the same |
| CN102903403A (en) * | 2012-09-27 | 2013-01-30 | 中国核电工程有限公司 | Active and non-active combined core water injection heat lead-out device |
| CN103996418A (en) * | 2013-02-14 | 2014-08-20 | 韩国原子力研究院 | Multi stage safety injection device and passive safety injection system having the same |
| KR101463441B1 (en) * | 2013-05-31 | 2014-11-21 | 한국원자력연구원 | High concentration boron injection system and safety injection system having the same |
| CN203596180U (en) * | 2013-09-06 | 2014-05-14 | 中国核电工程有限公司 | Emergency reactor core cooling system |
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| Publication number | Publication date |
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| CN105139902B (en) | 2018-10-12 |
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