CN202887744U - Combined active and passive emergency shut-down system - Google Patents
Combined active and passive emergency shut-down system Download PDFInfo
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- CN202887744U CN202887744U CN2012205096045U CN201220509604U CN202887744U CN 202887744 U CN202887744 U CN 202887744U CN 2012205096045 U CN2012205096045 U CN 2012205096045U CN 201220509604 U CN201220509604 U CN 201220509604U CN 202887744 U CN202887744 U CN 202887744U
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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
Abstract
The utility model belongs to a reactor design technology, and particularly relates to a combined active and passive emergency shut-down system. The combined active and passive emergency shut-down system comprises a control rod emergency shut-down subsystem and an emergency boron injection subsystem. A shut-down breaker of the control rod emergency shut-down subsystem is connected with a reactor protection system, so as to receive emergency shut-down signals emitted by the reactor protection system and realize dropping-down of a control rod; the emergency boron injection subsystem comprises a thick boron storage tank and an injection pump on an injection pipeline; the thick boron storage tank is connected with a reactor pressure container and a reactor core through the injection pipe; and an injection pump control system is connected with the reactor protection system, so as to receive emergency shut-down failure signals or high-neutron-flux signals of the reactor core, which are emitted by the reactor protection system, and inject thick boron into the reactor pressure container and the reactor core. By utilizing the combined active and passive emergency shut-down system provided by the utility model, the reliability of the reactor emergency shut-down system in an accident condition can be improved, and the security of the reactor is improved.
Description
Technical field
The utility model belongs to the reactor designing technique, be specifically related to a kind of actively with the non-last moment emergency shut-down that actively combines.
Background technology
In the nuclear power plant accident situation, realize that last moment emergency shut down is the important prerequisite of protective reaction heap safety.For traditional presurized water reactor design, the main realization approach of last moment emergency shut down is to insert the control rod that is comprised of neutron poison to make reactor enter at once subcritical state in reactor core.This dependence control rod realizes that the process of emergency shut-down is: reactor protection system is carried out logical operation, produces the reactor emergency shut-down and drives signal, and emergency shut-down drives signal and makes shutdown breaker coil dead electricity; the shutdown isolating switch is opened; rod power supply dead electricity, control rod falls, the reactor shutdown.This last moment emergency shut down method exists control rod can not descend to insert to cause the Potential feasibility that reactor can not emergency shut-down.
When failing the such least favorable accident of emergency shut-down when the normal feedwater of forfeiture and forfeiture off-site power occur, need to start auxiliary feedwater system and make halt turbines guarantee reactor safety by the accident mitigation system, and these two conditions can not be guaranteed to realize.That is to say that the last moment emergency shut down means are relatively single in the traditional design can't guarantee reactor safety, need to utilize the shutdown means of different mechanism to close down with realization response heap safety.
Comprise chemical volume control system in the reactivity control of pressurized-water reactor nuclear power plant, regulate the boron concentration of a Loop Water by in cooling medium, adding boric acid, thereby reactivity is regulated.At present, traditional chemical volume control system can't in time provide emergent boron to inject, and also can't realize the injection of high concentration of boric acid, and therefore, the means that it can only be regulated as reactor capability can not be as a kind of means of last moment emergency shut down.
The utility model content
The purpose of this utility model is the defective for prior art, and a kind of active and the non-last moment emergency shut-down that actively combines are provided, and strengthens the reliability of reactor emergency shutdown system under the accident conditions, the security of raising reactor.
The technical solution of the utility model is as follows: a kind of actively with the non-last moment emergency shut-down that actively combines, comprise control rod last moment emergency shut down subsystem, the shutdown isolating switch of control rod last moment emergency shut down subsystem is connected with reactor protection system, and the scram signal that the reception reactor protection system is sent also realizes that control rod falls; Comprise that also emergent boron injects subsystem; emergent boron injects subsystem and comprises dense boron storage tank; dense boron storage tank is by injecting pipeline coupled reaction core pressure vessel and reactor core; inject pipeline and be provided with injection pump; injection pump is connected with reactor protection system, and failing of receiving that reactor protection system sends realized emergency shut-down accident protection signal or the high signal of reactor core neutron flux and with dense boron piii reactor pressure vessel and reactor core.
Further, aforesaid actively with the non-last moment emergency shut-down that actively combines, wherein, in described dense boron storage tank, be provided be used to guaranteeing that solution temperature is not less than the electrical heating elements of boron Tc.
Further, aforesaid actively with the non-last moment emergency shut-down that actively combines, wherein, described injection pipeline one end connects dense boron tank bottom, the other end is connected with the flow in pipes of cold section of reactor safety injection system.
Further, aforesaid active and the non-last moment emergency shut-down that actively combines, wherein, described emergent boron injected system comprise two independently serial, each series is provided with separately a dense boron storage tank and an injection pipeline, and the dense boron capacity of each series all satisfies 100% injectability.
Further, aforesaid actively with the non-last moment emergency shut-down that actively combines, wherein, described dense boron storage tank is connected with the water make-up system with reactor boron.
Further, aforesaid active and the non-last moment emergency shut-down that actively combines, wherein, the concentration of B solution is 7000-9000ppm in the described dense boron storage tank, the environment temperature in boron notes room, case place is higher than 9000ppm BAS Tc limit value.
The beneficial effects of the utility model are as follows: the utility model provide a kind of actively with the non-last moment emergency shut-down that actively combines and method, when accident conditions occur, when needing emergency shut-down, both can rely on the non-active lower slotting realization emergency shut-down of control rod self gravitation, can when non-active means lost efficacy, inject concentrated boric acid solution by active means again and make the reactor sudden closure, greatly improve the security of reactor.
Description of drawings
Fig. 1 is that system of the present utility model forms and the steering logic synoptic diagram.
Among the figure, 1. reactor pressure vessel and reactor core 2. steam generators 3. voltage stabilizers 4. main pumps 5. control rod driving systems 6. shutdown isolating switchs 7. emergent boron injected system 8. dense boron storage tank 9. electrical heating elements 10. injection pumps 11. inject pipeline 12. containments
Embodiment
Actively with the non-last moment emergency shut-down that actively combines be two generation modified npp safety system ripe mentality of designing and the basis of the design means of risk-informed on, after optimizing original control rod outage, rely on outside the last moment emergency shut down means of inserting under the gravity, increase emergent boron injected system as active last moment emergency shut down means.This kind configuration belongs to actively and the non-safety practice that actively combines, both can close down by non-active Dropping of control rod realization response heap, also can inject by active emergent boron realization response heap safety closes down, make the last moment emergency shut down means have redundancy and diversity, thereby improved nuclear reactor safety.
Provided by the utility model actively with the non-last moment emergency shut-down that actively combines, comprise that control rod last moment emergency shut down subsystem and emergent boron inject subsystem, the shutdown isolating switch of control rod last moment emergency shut down subsystem is connected with reactor protection system, and the scram signal that the reception reactor protection system is sent also realizes that control rod falls; Emergent boron injected system comprises dense boron storage tank; in described dense boron storage tank, be provided be used to guaranteeing that solution temperature is not less than the electrical heating elements of boron Tc; dense boron storage tank is by injecting pipeline coupled reaction core pressure vessel and reactor core; inject pipeline one end and connect dense boron tank bottom; the other end is connected with the flow in pipes of cold section of reactor safety injection system; inject pipeline and be provided with injection pump; injection pump is connected with reactor protection system, and failing of receiving that reactor protection system sends realized emergency shut-down accident protection signal or the high signal of reactor core neutron flux and with dense boron piii reactor pressure vessel and reactor core.Described dense boron storage tank is connected with the water make-up system with reactor boron.
It is active as follows with the non-last moment emergency shut down method that actively combines that said system adopts: under accident conditions, reactor protection system is sent the reactor scram signal to the shutdown isolating switch of control rod last moment emergency shut down subsystem, scram signal makes shutdown breaker coil dead electricity, the shutdown isolating switch is opened, control rod power supply dead electricity, control rod falls; When control rod falls to losing efficacy; reactor protection system is sent to emergent boron injected system and is failed to realize emergency shut-down accident protection signal or the high signal of reactor core neutron flux; after receiving signal, emergent boron injected system starts injection pump; with dense boron piii reactor pressure vessel and reactor core, realize last moment emergency shut down.
Below in conjunction with drawings and Examples the utility model is described in detail.
Embodiment
As shown in Figure 1; the conventional presurized water reactor that is used for nuclear power station comprises reactor pressure vessel and reactor core 1, steam generator 2, voltage stabilizer 3, main pump 4, control rod last moment emergency shut down subsystem 5, in addition; the design of nuclear power plant heap protection system that responds is comprised of relevant measurement instrument and control system etc.When having an accident, reactor protection system is carried out logical operation, sends the reactor emergency shut-down and drives signal (automatically shutdown signal or manual shutdown signal), triggers the control rod driving system 5 in the reactor emergency shutdown system.Emergency shut-down driving signal makes shutdown isolating switch 6 coil losing electricities in the control rod last moment emergency shut down subsystem 5, and shutdown isolating switch 6 is opened, control rod power supply dead electricity, and control rod falls, the reactor shutdown.In addition; if insert under the control rod unsuccessfully; by parameters such as monitoring reaction pile neutron fluences; the affirmation control rod fails to realize last moment emergency shut down (ATWS); reactor protection system is sent to emergent boron injected system and is failed to realize scram signal (ATWS signal) or the high signal of reactor core neutron flux, thereby starts emergent boron injected system 7.
In the present embodiment, emergent boron injects subsystem 7 and is provided with two independently series, and each serial capacity is 100% injectability.Each series comprises separately a dense boron storage tank 8, in dense boron storage tank 8, be provided be used to guaranteeing that solution temperature is not less than the electrical heating elements 9 of boron Tc, dense boron storage tank 8 is by injecting pipeline 11 coupled reaction core pressure vessel and reactor cores, inject the bottom that pipeline 11 1 ends connect dense boron storage tank 8, the other end is connected with the flow in pipes of cold section of reactor safety injection system, injects pipeline 11 and is provided with injection pump 10.Dense boron storage tank 8 is connected with the water make-up system with reactor boron.Two boron of two series inject pipeline and be merged into a female pipe of injection after entering containment 12, then can be further divided into three and inject pipelines are connected to reactor coolant loop by the flow in pipes of cold section of safety injection system three cold legs.Certainly, this connected mode just proposes as a kind of embodiment, and those skilled in the art can adopt other pipeline connected mode with dense boron piii reactor pressure vessel and reactor core fully.
Emergent boron injects subsystem and can automatically start, and also can manually boot, and the dense B solution in the dense boron storage tank is injected into reactor-loop.When inserting unsuccessfully under control rod, emergent boron injected system is received the ATWS signal, with dense boron piii reactor pressure vessel and reactor core, realizes last moment emergency shut down.In addition, under the accident conditionses such as Main steam line break, in order to guarantee shut down depth, prevent the reactor recovery of critical, after inserting control rod, start simultaneously emergent boron injected system according to the reactor protection signal, guarantee that reactor remains on the state of closing down safely.
At the nuclear power station normal operation period, the control rod group is in the normal position, and emergent boron injection pump is in stand-by state; After scram signal produces, be seated anxious shutdown under the control rod, inefficacy will produce the ATWS signal or thereby the emergent boron injection pump of the high signal startup of reactor core neutron flux absorbs water from dense boron storage tank if insert under the control rod, the boron injection pump has enough pressure heads to guarantee under any circuit pressure to reactor core B Implanted acid solution, thus realization response heap safe shutdown.
In addition, the utility model can also arrange the boric acid recirculation line in order to the BAS in the dense boron storage tank of regular circulation, can be provided for pipeline and the valve of moisturizing and boron make-up acid solution on the dense boron storage tank.
The utility model provides two approach for the last moment emergency shut down of reactor, and dual mode mutually combines, and jointly plays a role, and has greatly improved on the whole the reliability that last moment emergency shut down is realized, thus the security that has improved reactor.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technology thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (6)
- One kind actively with the non-last moment emergency shut-down that actively combines, comprise control rod last moment emergency shut down subsystem (5), the shutdown isolating switch (6) of control rod last moment emergency shut down subsystem (5) is connected with reactor protection system; It is characterized in that: comprise that also emergent boron injects subsystem (7); emergent boron injects subsystem (7) and comprises dense boron storage tank (8); dense boron storage tank (8) is by injecting pipeline (11) coupled reaction core pressure vessel and reactor core (1); inject pipeline (11) and be provided with injection pump (10), injection pump (10) is connected with reactor protection system.
- As claimed in claim 1 actively with the non-last moment emergency shut-down that actively combines, it is characterized in that: in described dense boron storage tank (8), be provided be used to guaranteeing that solution temperature is not less than the electrical heating elements of boron Tc (9).
- 3. active and the non-last moment emergency shut-down that actively combines as claimed in claim 1 or 2, it is characterized in that: described injection pipeline (11) one ends connect bottom the dense boron storage tank (8), and the other end is connected with the flow in pipes of cold section of reactor safety injection system.
- As claimed in claim 1 or 2 actively with the non-last moment emergency shut-down that actively combines, it is characterized in that: described emergent boron injected system (7) comprises two independently series, each series is provided with separately a dense boron storage tank (8) and an injection pipeline (11), and the dense boron capacity of each series all satisfies 100% injectability.
- As claimed in claim 4 actively with the non-last moment emergency shut-down that actively combines, it is characterized in that: described dense boron storage tank (8) is connected with the water make-up system with reactor boron.
- As claimed in claim 1 or 2 actively with the non-last moment emergency shut-down that actively combines, it is characterized in that: the concentration of B solution is 7000-9000ppm in the described dense boron storage tank, and the environment temperature that boron is annotated room, case place is higher than 9000ppm BAS Tc limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205096045U CN202887744U (en) | 2012-09-27 | 2012-09-27 | Combined active and passive emergency shut-down system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205096045U CN202887744U (en) | 2012-09-27 | 2012-09-27 | Combined active and passive emergency shut-down system |
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| CN202887744U true CN202887744U (en) | 2013-04-17 |
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| CN2012205096045U Withdrawn - After Issue CN202887744U (en) | 2012-09-27 | 2012-09-27 | Combined active and passive emergency shut-down system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881340A (en) * | 2012-09-27 | 2013-01-16 | 中国核电工程有限公司 | Emergency shut-down system and method combining activeness and passiveness |
| CN104658619A (en) * | 2015-02-11 | 2015-05-27 | 中国科学院合肥物质科学研究院 | Inherent safety protection method of fast neutron zero power device under flooding severe accident |
| CN104992733A (en) * | 2015-05-25 | 2015-10-21 | 中国核电工程有限公司 | Safety injection system |
| CN105161143A (en) * | 2014-05-29 | 2015-12-16 | 江苏核电有限公司 | Effect-improved energy-efficient integrated method during physical starting of reactor |
| CN108766600A (en) * | 2018-05-31 | 2018-11-06 | 中国核动力研究设计院 | A kind of primary Ioops flood pattern |
| CN109147967A (en) * | 2017-06-15 | 2019-01-04 | 广东核电合营有限公司 | A kind of boron concentration control apparatus and method for nuclear power station |
| CN111292862A (en) * | 2020-03-27 | 2020-06-16 | 江苏核电有限公司 | Emergency reactor shutdown method based on signal state of safety important instrument of nuclear power plant |
-
2012
- 2012-09-27 CN CN2012205096045U patent/CN202887744U/en not_active Withdrawn - After Issue
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014048291A1 (en) * | 2012-09-27 | 2014-04-03 | 中国核电工程有限公司 | Combined active and passive emergency shutdown system and method |
| GB2519920A (en) * | 2012-09-27 | 2015-05-06 | China Nuclear Power Eng Co Ltd | Combined active and passive emergency shutdown system and method |
| CN102881340A (en) * | 2012-09-27 | 2013-01-16 | 中国核电工程有限公司 | Emergency shut-down system and method combining activeness and passiveness |
| CN102881340B (en) * | 2012-09-27 | 2015-09-23 | 中国核电工程有限公司 | A kind of active and non-active last moment emergency shut-down of combining and method |
| GB2519920B (en) * | 2012-09-27 | 2018-08-08 | China Nuclear Power Eng Co Ltd | Combined active and passive emergency shutdown system and method |
| CN105161143A (en) * | 2014-05-29 | 2015-12-16 | 江苏核电有限公司 | Effect-improved energy-efficient integrated method during physical starting of reactor |
| CN104658619A (en) * | 2015-02-11 | 2015-05-27 | 中国科学院合肥物质科学研究院 | Inherent safety protection method of fast neutron zero power device under flooding severe accident |
| CN104992733A (en) * | 2015-05-25 | 2015-10-21 | 中国核电工程有限公司 | Safety injection system |
| CN104992733B (en) * | 2015-05-25 | 2019-01-04 | 中国核电工程有限公司 | A kind of safety injection system |
| CN109147967A (en) * | 2017-06-15 | 2019-01-04 | 广东核电合营有限公司 | A kind of boron concentration control apparatus and method for nuclear power station |
| CN109147967B (en) * | 2017-06-15 | 2022-08-16 | 广东核电合营有限公司 | Boron concentration control device and method for nuclear power station |
| CN108766600A (en) * | 2018-05-31 | 2018-11-06 | 中国核动力研究设计院 | A kind of primary Ioops flood pattern |
| CN108766600B (en) * | 2018-05-31 | 2021-08-17 | 中国核动力研究设计院 | Primary loop water injection system |
| CN111292862A (en) * | 2020-03-27 | 2020-06-16 | 江苏核电有限公司 | Emergency reactor shutdown method based on signal state of safety important instrument of nuclear power plant |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20150923 |
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| RGAV | Abandon patent right to avoid regrant |