CN106033686B - A kind of high nuclear reactor shutdown unit of reliability - Google Patents
A kind of high nuclear reactor shutdown unit of reliability Download PDFInfo
- Publication number
- CN106033686B CN106033686B CN201510598555.5A CN201510598555A CN106033686B CN 106033686 B CN106033686 B CN 106033686B CN 201510598555 A CN201510598555 A CN 201510598555A CN 106033686 B CN106033686 B CN 106033686B
- Authority
- CN
- China
- Prior art keywords
- burnable poison
- guide pipe
- fuel tank
- nuclear reactor
- poison ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the reactive control technology field of nuclear reactor, more particularly to a kind of nuclear reactor shutdown unit with higher reliability.The device is installed in command bundle rods for nuclear reactors and is oriented to above tube support plate, and whole device is using fuel tank as agent structure；Fuel tank upper end is provided with top cover, and inside is equipped with burnable poison ball, and is provided with guiding grid separator plate and electromagnetic switch, and valve and burnable poison guide pipe are installed in lower end.When nuclear reactor needs shutdown, electromagnetic switch power-off, valve is opened, and the burnable poison club in fuel tank falls under gravity, and is flowed into along burnable poison ball guide pipe in control rod guide pipe, into reactor core；Boron element in burnable poison ball can absorb the neutron in nuclear reactor so that the reactivity decline of nuclear reactor, reach the purpose of shutdown.Apparatus structure manufacture is simple, occupies little space, and without carrying out perforate to pressure vessels top cover, falls accurate, is swift in response, will not occur rod seizure accident, possess higher reliability.
Description
Technical field
The invention belongs to the emergent security technology area of nuclear power plant, more particularly to a kind of nuclear reactor with higher reliability
Shutdown unit.
Background technology
Reactivity control system is used for the reactivity for controlling nuclear reactor, and the system includes molten control system and rod control system.
When nuclear power plant occurs accident and needs shutdown, boric acid solution can be injected into nuclear reactor, while control rod falls into nuclear reaction
Heap reactor core, absorbs the neutron in reactor core, makes reactive reduction, final shutdown.
The reactor normally run belongs to critical reactor, in order to control its reactive need to be added in fuel rod containing boron element
Control rod, boric acid solution is added in cooling agent.Boron element has higher neutron-capture cross section, can absorb neutron, because
This can reach the effect of control pile reactivity by the boric acid solution concentration in elevating control rod and regulation cooling agent.
In first time dress heap, reactor includes, fuel rod, control rod, burnable poison and resistance plug assembly.Circulated at second
In, burnable poison is removed, and changes resistance plug assembly.And in addition to these control assemblies, some is shutdown control
Rod, generally these shut-down rods and is not inserted into reactor core, until accident occurs for nuclear power plant, shut-down rod can fall into nuclear reaction
Heap reactor core, plays a part of shutdown.
When reactor accident occurs and needs emergency shut-down, CRDM power-off is about 1 centimetre of 3 rice diameter
Control rod can drop to reactor core along control rod guide pipe under gravity, and under powering-off state, control rod is from most
The maximum duration that high position freely falls to extreme lower position is 3.2 seconds.Concentrated boric acid solution is injected into reactor coolant simultaneously.
In place of above-mentioned reactor shut-off system Shortcomings：
（1）The molten control system response cycle is slower；
（2）Control rod is long, because thermal expansion may deform in the reactor of high temperature, therefore in dropping process
In can occur card rod；
（3）CRDM is complex, it is possible to occurs card rod or falls accident by mistake；
（4）Control rod length is longer, takes larger space；
（5）Control rod length is longer, it is necessary to which the perforate on top cover of reactor pressure vessel, reduces pressure vessel safety;
（5）Original burnable poison position is idle, and causes the waste using space.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of high spherical nuclear reactor emergency shut-down dress of reliability
Put.
The technical solution adopted by the present invention is：
The nuclear reactor shutdown unit replaces original control rod shut-down rod；Described device is positioned in original insertion shutdown
The position of rod, is oriented to above tube support plate positioned at control rod；Described device main body is the fuel tank of a cuboid, and top is carried
Top cover, inside is equipped with burnable poison ball, is oriented to grid separator plate and electro-magnet switch, and lower end connecting valve and burnable poison ball are oriented to
Pipe.When accident, which occurs, for nuclear reactor needs shutdown, electromagnet is opened the light power-off, and valve is opened, the burnable poison ball in fuel tank
It is flowed into by burnable poison ball guide pipe in control rod guide pipe, burnable poison ball accumulates rise in control rod guide pipe,
Boron element in burnable poison ball absorbs the neutron in nuclear reactor so that nuclear reactor reactivity declines final shutdown.
Fuel tank in described device is a cuboid cavity, and its bottom surface is more bigger than shutdown rod assembly, if the length of side is L,
Then height is 3.1 times of its base length of side, and cavity wall thickness is 2 millimeters；Upper end is covered tightly after being fed with top cover；The drift angle of lower end four
With alignment pin；Lower surface is not fully sealed, and possesses the square hollow slots of n block lengths, and every piece of dead slot one row control rod of correspondence is oriented to
The pipe mouth of pipe.
Burnable poison ball in described device, is made up of 304 stainless steels, for the stainless steel bead with through hole, bead
Internal to be perforated with a toroidal cavity around pipe, toroidal cavity volume accounts for 95 the percent of burnable poison ball complement product, empty
Intracavitary be divided into above and below two parts, upper part accounts for the 20% of total cavity volume, is filled with helium, and internal pressure is side pressure of reactor
Strong 0.25 times.The self gravitation of burnable poison ball can be reduced by adding helium, prevent and treat that falling speed is too fast to be made to bottom device
Into infringement.Meanwhile, annular helium chamber, which is inclined to one end, can make neutron reflection ball axially fall along through hole at whereabouts；Lower part
Boron glass is inserted, its composition is SiO2 and B2O3.When an accident occurs, burnable poison ball is fallen into control rod guide pipe, boron glass
Boron element in glass has larger neutron absorption cross-section, can absorb neutron, reduces pile reactivity so that nuclear reactor
Gradually shutdown.Now, the helium chamber in burnable poison, can be with except playing a part of controlling burnable poison ball falling state
For accommodating the helium that the boron element in boron glass is produced with neutron reaction, caused by preventing and treating burnable poison ball internal pressure is excessive
It is damaged.The burnable poison radius of a ball is 0.6 times of burnable poison ball guide pipe outlet diameter, and more than control rod guide pipe flowing water
Bore dia, allows it to fall in vertical pipeline, and will not be flowed out from discharge orifice；The wherein a diameter of burnable poison of through hole
0.28 times of ball, when burnable poison ball is flowed into control rod guide pipe, through hole is used for balancing bead in control rod guiding
Hydraulic pressure up and down when in pipe；When nuclear reactor safety is run, burnable poison ball is placed in fuel tank.
Guiding grid separator plate in described device, positioned at fuel tank interior, is that two hollow right-angle prismatic cones are formed by connecting, pacifies
On fuel tank lower surface, rectangular space is used to install electro-magnet switch below grid separator plate, is oriented to grid separator plate laterally common n
Block, longitudinally there is n blocks, for making burnable poison ball smoothly be flowed into burnable poison ball guide pipe, and is led to flowing into control rod
Burnable poison ball into pipe is quantified.
Whether electro-magnet switch and valve in corresponding device can for controlling the burnable poison ball in fuel tank to fall into
Fire in poisonous substance ball guide pipe；Have n electro-magnet switch and n valve, one valve of each electro-magnet switch correspondence.Electromagnet
It is located at fuel tank interior for cuboid switch, is being oriented to below grid separator plate, is being evenly arranged inside cuboid comprising 6 iron staffs, iron
Rod lower end, to flat, be tied with wire and form independent electromagnet, circuit uses parallel way with fuel cell bottom end on each iron staff,
Overall electro-magnet switch failure, causes burnable poison ball to fall by mistake caused by preventing portion separated time road is damaged；Power supply uses factory of nuclear power plant
Electricity consumption, when occurring the loss of power accident, electro-magnet switch disconnects automatically；Valve is a rectangle stainless steel substrates, wherein one long
While being hinged on fuel tank lower end, when valve is closed, electro-magnet switch is close in the one end not being hinged, and is held by electromagnet, long
Square stainless steel substrates can just seal the hollow slots below fuel tank, prevent burnable poison ball from falling.
Burnable poison ball guide pipe in described device, n × n, similar to funnel shaped, big opening is upwards and fuel tank
Lower end is connected, and big opening is corresponding with valve openings.Lower end is inserted into control rod guide pipe.After valve opening, burnable poison
Fallen under ball in burnable poison ball guide pipe, and fallen under guide pipe in control rod guide pipe.
Beneficial effects of the present invention are：
（1）The present invention compares compacter with structure for Traditional control rod；
（2）The present invention is due to compact conformation, therefore without the perforate on top cover of reactor pressure vessel；
（3）The present invention absorbs seed using burnable poison ball, will not occur rod seizure accident, security is higher；
（4）The present invention is compared to designing concise for CRDM, reliability is stronger；
（5）Flexibility of the present invention is strong, just applicable by simply adjustment for different heap-type, different requirements；
（6）Strong adaptability of the present invention, is applicable to active service nuclear reactor and larger without being carried out to equipment in reactor
Change；
（7）The present invention is larger in the area coverage that control rod is oriented on tube support plate, to having more above reactor vessel
Strong radiation protection ability.
Brief description of the drawings
Fig. 1, Fig. 2 are respectively the schematic diagram and diagrammatic cross-section of reactor emergency stop means；
Fig. 3, Fig. 4 are respectively the schematic diagram of fuel tank and the schematic diagram of fuel tank section；
Fig. 5, Fig. 6 are respectively the schematic diagram of burnable poison ball and the schematic diagram of burnable poison ball section；
Fig. 7, Fig. 8 are respectively the schematic diagram for the left side view for being oriented to grid separator plate and the signal for being oriented to grid separator plate right side view
Figure；
Fig. 9, Figure 10 are respectively the schematic diagram of electromagnetic switch and the schematic diagram of electromagnetic switch section；
Figure 11 is the schematic diagram of valve；
Figure 12,13 are respectively the schematic diagram of burnable poison guide pipe and the schematic diagram of burnable poison guide pipe section；
Symbol description
1 is electromagnet
B is the vitreum containing boron element.
Embodiment
The present invention provides a kind of reliability high nuclear reactor emergency stop means, below in conjunction with the accompanying drawings and specific embodiment party
The present invention will be further described for formula.
Assuming that nuclear reactor control cluster is three structures for multiplying three, show as shown in Figure 1 for an entirety of apparatus of the present invention
Be intended to, present device is externally using fuel tank as agent structure, above it plus top set lid, inside be provided with steering gate every
Plate, positioned beneath burnable poison guide pipe；Profile as shown in Figure 2, it can be seen that fuel tank interior lower end will also install electromagnetism additional
Switch and valve, and neutron reflection ball and burnable poison ball are placed in fuel tank；When nuclear reactor needs shutdown, electricity
Magnetic switch is powered off, and valve is opened, and the burnable poison ball in fuel tank falls, and control rod is fallen on along under burnable poison ball guide pipe
In conduit, it is flowed into reactor core, the boron element in burnable poison ball can absorb neutron, reduction nuclear reactor is reactive, so that
Reach the effect of shutdown.
It is as shown in Figure 3, Figure 4 the fuel tank with top cover, is formed using plate sheet welding, upper articulation has top cover, lower end
Three slots are provided with, lower end corner carries alignment pin, and lower end both sides are used to link valve with hinge hole.
Such as Fig. 5, Fig. 6 are burnable poison ball, using 304 stainless steels, and through hole is carried in the middle part of bead, internal with cavity,
Boron glass is inserted below cavity, its composition is SiO2 and B2O3；Superjacent air space is filled with helium, falls for alleviating in burnable poison ball
The pressure that gas is brought is produced after entering in nuclear reactor.Entrance is welded after helium is filled with.
As shown in Figure 7, Figure 8 to be oriented to grid separator plate, three pieces of longitudinal direction is horizontal two pieces, by intercalating dye case after interpolation.With
It is rationed in the burnable poison ball in fuel tank is carried out,
As shown in Figure 9, Figure 10, electromagnetic switch is rectangular parallelepiped structure, and inside includes 5 electromagnet elements, using parallel connection side
Formula is linked on the station service of nuclear power plant, it is to avoid the Wu that single fault is caused opens phenomenon.Whole electromagnetic switch uses screw
The back of the body is fixed on fuel tank lower shoe.
It is as shown in figure 11 valve, simple structure, wherein one end are directly hinged on the hinge hole below fuel tank.
It is as shown in Figure 12 and Figure 13 burnable poison guide pipe, by the way of welding, is placed in below fuel tank, is oriented to
Pipe lower end is inserted into control rod guide pipe.
When nuclear reactor needs shutdown, electro-magnet switch disconnects, effect of the burnable poison ball in fuel tank in gravity
Valve opening door is pushed, is flowed into along burnable poison guide pipe in control rod guide pipe, the boron element in burnable poison absorbs neutron,
Make its gradually shutdown so as to reduce nuclear reactor reactivity.
Claims (1)
1. the high water-cooled reactor shutdown unit of reliability, it is characterised in that shutdown unit includes：Fuel tank, burnable poison ball,
It is oriented to grid separator plate, electromagnetic switch and the part of burnable poison ball guide pipe five；
Fuel tank is rectangular box structure, and top carries top cover, and bottom carries several rectangle hollow slots；In burnable poison ball
Portion carries through hole, has toroidal cavity around through hole, toroidal cavity top is filled with helium, and boron glass is inserted in toroidal cavity bottom
Glass；Guiding grid separator plate is many plate Inserting structures, is oriented to grid separator plate and is installed in fuel tank interior, is oriented to grid separator plate each to falling into
Burnable poison ball number in burnable poison ball guide pipe is defined；
Electromagnetic switch is made up of electro-magnet switch and valve two parts, and electro-magnet switch switchs for cuboid, and is placed in fuel
Inside case, positioned at being oriented to below grid separator plate, 6 electromagnet posts in parallel are installed inside electro-magnet switch, electro-magnet switch and
Valve is corresponded；Burnable poison ball guide pipe top is cuboid, and bottom is funnel-shaped structure；Burnable poison ball guide pipe quilt
Installed in fuel lower box part, electromagnetic switch of the burnable poison ball guide pipe upper orifice just to fuel lower box part；Water-cooled reactor stops
Stack device is installed in the hanging basket inside Technologies of PWR Vessels, directly over fuel assembly, burnable poison ball guide pipe
Lower nozzle is just to original presurized water reactor control rod guide pipe upper orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598555.5A CN106033686B (en) | 2015-09-21 | 2015-09-21 | A kind of high nuclear reactor shutdown unit of reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598555.5A CN106033686B (en) | 2015-09-21 | 2015-09-21 | A kind of high nuclear reactor shutdown unit of reliability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106033686A CN106033686A (en) | 2016-10-19 |
| CN106033686B true CN106033686B (en) | 2017-10-03 |
Family
ID=57149040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510598555.5A Expired - Fee Related CN106033686B (en) | 2015-09-21 | 2015-09-21 | A kind of high nuclear reactor shutdown unit of reliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106033686B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210104336A1 (en) * | 2017-03-28 | 2021-04-08 | A. Robert Abboud and Company | Changing Density Particles Having a Neutron Absorbent and a Thermal Conductor |
| CN111063461B (en) * | 2019-12-31 | 2022-07-08 | 中国科学院合肥物质科学研究院 | Solid critical device |
| CN111613348B (en) * | 2020-05-20 | 2023-11-14 | 中国核电工程有限公司 | Magnetic attraction type critical experiment device and method for non-contact arrangement of neutron poison rod |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4279697A (en) * | 1977-12-03 | 1981-07-21 | Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung | Method of and apparatus for shutting down a gas-cooled nuclear reactor |
| US4378329A (en) * | 1979-06-18 | 1983-03-29 | Hitachi, Ltd. | Nuclear reactor core construction |
| US4411860A (en) * | 1980-03-22 | 1983-10-25 | Ght, Gesellschaft Fur Hochtemperaturreaktor-Technik Mbh | Pebble bed reactor with feeding device for absorber material and method for its operation |
| CN1447342A (en) * | 2003-04-04 | 2003-10-08 | 清华大学 | Second shutdown system of absorption ball applicable to gas-cooled reactor |
| CN101789271A (en) * | 2010-01-26 | 2010-07-28 | 清华大学 | Neutron absorption ball |
| CN101814325A (en) * | 2010-04-09 | 2010-08-25 | 吕应中 | Method for automatically producing high-temperature nuclear energy for long term under any power |
| CN102262907A (en) * | 2011-04-29 | 2011-11-30 | 清华大学 | High temperature gas cooled reactor absorption ball pneumatic conveying feeder and conveying system |
| CN103928061A (en) * | 2013-01-14 | 2014-07-16 | 上海核工程研究设计院 | Reverse pushing type reactor pressure vessel and reactor internals thereof |
| CN104094359A (en) * | 2011-12-02 | 2014-10-08 | 原子能和替代能源委员会 | Device for triggering and inserting absorbing members and/or mitigators in fissile area of nuclear reactor and nuclear fuel assembly comprising the device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003227892A (en) * | 2002-02-05 | 2003-08-15 | Mitsubishi Heavy Ind Ltd | Fuel assembly for nuclear reactor and excess reactivity control method |
| JP5665672B2 (en) * | 2011-07-01 | 2015-02-04 | 株式会社東芝 | Nuclear fuel reactivity suppression method and reactivity suppression device |
-
2015
- 2015-09-21 CN CN201510598555.5A patent/CN106033686B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4279697A (en) * | 1977-12-03 | 1981-07-21 | Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung | Method of and apparatus for shutting down a gas-cooled nuclear reactor |
| US4378329A (en) * | 1979-06-18 | 1983-03-29 | Hitachi, Ltd. | Nuclear reactor core construction |
| US4411860A (en) * | 1980-03-22 | 1983-10-25 | Ght, Gesellschaft Fur Hochtemperaturreaktor-Technik Mbh | Pebble bed reactor with feeding device for absorber material and method for its operation |
| CN1447342A (en) * | 2003-04-04 | 2003-10-08 | 清华大学 | Second shutdown system of absorption ball applicable to gas-cooled reactor |
| CN101789271A (en) * | 2010-01-26 | 2010-07-28 | 清华大学 | Neutron absorption ball |
| CN101814325A (en) * | 2010-04-09 | 2010-08-25 | 吕应中 | Method for automatically producing high-temperature nuclear energy for long term under any power |
| CN102262907A (en) * | 2011-04-29 | 2011-11-30 | 清华大学 | High temperature gas cooled reactor absorption ball pneumatic conveying feeder and conveying system |
| CN104094359A (en) * | 2011-12-02 | 2014-10-08 | 原子能和替代能源委员会 | Device for triggering and inserting absorbing members and/or mitigators in fissile area of nuclear reactor and nuclear fuel assembly comprising the device |
| CN103928061A (en) * | 2013-01-14 | 2014-07-16 | 上海核工程研究设计院 | Reverse pushing type reactor pressure vessel and reactor internals thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106033686A (en) | 2016-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201689688U (en) | System for cooling reactor core, filling water in reactor cavity and guiding out heat of containment | |
| KR101242746B1 (en) | Integrated passive safety system outside containment for nuclear power plants | |
| WO2010038358A1 (en) | Pressurized water nuclear power plant | |
| US20020085660A1 (en) | Boiling water reactor nuclear power plant and its construction method | |
| US3498880A (en) | Liquid cooled nuclear reactor with means for isolating heat exchanger | |
| CN106033686B (en) | A kind of high nuclear reactor shutdown unit of reliability | |
| KR100813939B1 (en) | Passive type emergency core cooling system for an integral reactor with a safeguard vessel | |
| CN104919531A (en) | Passive system for cooling the core of a nuclear reactor | |
| WO2014048290A1 (en) | Combined active and passive reactor cavity water injection cooling system | |
| CN202102730U (en) | Out-of-pile cooling and curing device of reactor core fusant in reactor severe accident and system | |
| CN103337264A (en) | Residual heat removal system for molten salt reactor buffer salt accident | |
| CN103440891B (en) | The non-active moisturizing spray system of Spent Fuel Pool | |
| CN114121313B (en) | Passive safety system of compact reactor | |
| Zheng et al. | Water-ingress analysis for the 200áMWe pebble-bed modular high temperature gas-cooled reactor | |
| CN103390436B (en) | Integral reactor passive heap chamber flow passage system and application process | |
| KR101250479B1 (en) | Apparatus for safety improvement of passive type emergency core cooling system with a safeguard vessel and Method for heat transfer-function improvement using thereof | |
| KR101463441B1 (en) | High concentration boron injection system and safety injection system having the same | |
| JP2023520355A (en) | reactor controller | |
| CN202563900U (en) | Uranium-plutonium fuel sphere bed type reactor | |
| CN103413582B (en) | Peace note case | |
| CN203070791U (en) | Built-in spent fuel pool of containment | |
| CN114334192B (en) | Passive waste heat discharging device of microminiature horizontal reactor | |
| US4859406A (en) | Reactor | |
| JPS62172291A (en) | Long-term stopping method and device for high-temperature reactor | |
| EP4250315A1 (en) | Safety system and safety control method for preventing molten corium from melting through rpv |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171003 Termination date: 20180921 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |