CN203070788U - Pressurized water nuclear reactor flow distribution device - Google Patents
Pressurized water nuclear reactor flow distribution device Download PDFInfo
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- CN203070788U CN203070788U CN2013200168075U CN201320016807U CN203070788U CN 203070788 U CN203070788 U CN 203070788U CN 2013200168075 U CN2013200168075 U CN 2013200168075U CN 201320016807 U CN201320016807 U CN 201320016807U CN 203070788 U CN203070788 U CN 203070788U
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- distribution device
- flow distribution
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- ball bowl
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model provides a pressurized water nuclear reactor flow distribution device which has a spherical bowl shaped mesh hole structure. A plurality of supporting rib plates are fixed below the bottom of the distribution device; multiple rows of equal-diameter circular holes are rotationally and symmetrically formed on the middle upper part of the peripheral side wall of the spherical bowl of the distribution device; each row of circular holes comprise a plurality of circular holes which are uniformly distributed along the circumferential direction; three rows of square drainage holes are formed on the lower part of the peripheral side wall of the spherical bowl of the distribution device with different radial distances away from the central shaft; each row of square drainage holes comprise a plurality of square holes which are distributed along the circumferential direction; square holes are not formed at the supporting rib plates; and a plurality of round drainage holes are formed in the central area of the bottom of the spherical bowl of the distribution device. According to the device, the related requirements of the flow field in the lower cavity of the pressure container can be well met, enough metals can be provided under the severe accident conditions of the reactor core so as to meet the related requirements of reactor core fusion; and meanwhile, the structure has the advantages of being convenient in maintenance and inspection, reducing the in-pile member vibration and the like.
Description
Technical field
The utility model relates to the PWR nuclear power plant nuclear reactor designs, is specifically related to a kind of pressurized-water reactor flow distribution device.
Background technology
Nuclear reactor is the important component part of nuclear steam supply system (NSSS), nuclear fuel is kept controlled chain reaction of nuclear fission here, the energy that nuclear fission produces raises the coolant temperature of the reactor of flowing through, and by coolant circulation circuit heat energy is derived from reactor core then.The degree of uniformity that reactor coolant distributes in reactor core will directly have influence on the Temperature Distribution of reactor core, the while opposite heat tube factor, and reactor core critical security parameters such as DNBR produce significant effects.
Before entering reactor core, the degree of uniformity of cooling medium has great importance, can it is related to the reactor core heat in time derive smoothly, the position of reactor core focus and the size of hot channel factor have directly been determined, and hot channel factor is directly connected to the safety of whole nuclear reactor and even whole nuclear power plant, has influence on the economy of nuclear steam simultaneously.
Simultaneously aspect the npp safety assessment, suppose under the major accident operating mode, to take place the reactor core fusion (hereinafter to be referred as: IVR), following all the in-pile component Metal Melting of reactor core change into liquid state, contact with the pressure vessel inwall, and the reactor core heat is derived.Under this accident conditions, need there be the metal of enough volumes to contact with the pressure vessel inwall, thereby increases heat transfer area, to guarantee that pressure vessel is not by burn through.
In view of the importance of cooling medium degree of uniformity and npp safety assessment, the heap flow distribution device that a kind of design performance is good is significant to safety and the economy of nuclear reactor.
Guarantee that the cooling medium that enters reactor core can evenly distribute, key is before cooling medium enters reactor core it to be distributed uniformly, and will reduce the generation of eddy current in the assignment of traffic process as far as possible, to reduce loss and the generation of vibration of coolant pressure.
Traditional flow distribution device mostly is the orifice-plate type structure, is formed by stacking by certain support by one or more layers orifice plate, and this structure flow distribution effects is undesirable, and structure and installation relative complex, be not easy to maintenance, and resistance coefficient is higher relatively.
External novel flow distribution device has adopted isolating construction, matched by an assignment of traffic ring of having processed a large amount of discharge orifices and an eddy current suppressing plate and to form, this structure assignment of traffic relative ideal, but the assignment of traffic boxing connects and is fixed on the pressure vessel, and maintenance is difficulty quite.
Summary of the invention
The purpose of this utility model is to provide a kind of can satisfy the related request in pressure vessel lower chambers flow field, the pressurized-water reactor flow distribution device with advantages such as being convenient to maintenance overhaul, the vibration of reduction in-pile component preferably.
Realize the technical scheme of the utility model purpose: a kind of pressurized-water reactor flow distribution device, it is that the ball bowl-type is mesh-structured, fixedly there are some bearing ribs below, distributor bottom; Be the isodiametric round hole of the many rows of rotation symmetric arrangement in distributor ball bowl circumferential side wall middle and upper part, every row's round hole comprises several circumferentially uniform circular ports; Be provided with the square discharge orifice of three rows at distributor ball bowl circumferential side wall bottom, distance center axle different radial distances place, the square discharge orifice of every row comprises the square opening of several circumferential arrangement, is having supporting gusset place not open square opening; Offer several circular discharge orifices in distributor ball bowl bottom central area.
Aforesaid a kind of pressurized-water reactor flow distribution device, described bearing rib has eight, is fixedly connected on below, distributor bottom by attachment screw.
Effect of the present utility model is:
Flow distribution device described in the utility model has adopted the ball bowl-type of having processed a large amount of discharge orifices mesh-structured, this structure can satisfy the related request in pressure vessel lower chambers flow field preferably, and can provide enough metal filled to satisfy the related request of reactor core fusion under reactor core major accident operating mode.This structure also has advantages such as the maintenance overhaul of being convenient to, the vibration of reduction in-pile component simultaneously.
Nuclear reactor flow distribution device major function of the present utility model is to make the cooling medium that enters from pressure vessel inlet, behind ring cavity, after entering pressure vessel lower chambers flow distribution device, realize turning to along pressure vessel low head arc surface and discharge orifice, flow distribution device bottom, during this time by its side and discharge orifice, bottom, from around and the cooling medium of bottom surface in flow distribution device, carry out entering reactor core after the mixing to a certain degree.Owing to there are eight supporting gussets to be connected and fixed, make whole flow distribution device have good rigidity, enough resist side knock and the hydraulic hoist power of cooling medium.
Regulate distribution effects and friction loss before cooling medium enters reactor core by size, quantity, shape, the position of change flow distribution device side and discharge orifice, bottom, distribute deviation allowable value, maximum average discharge, indexs such as pressure drop with the inlet flow rate that satisfies adjacent assemblies.The metal volume of whole device can satisfy the IVR related request preferably.
Description of drawings
Fig. 1 is a kind of pressurized-water reactor flow distribution device cut-open view described in the utility model.
Fig. 2 is assignment of traffic body structure synoptic diagram.
Among the figure: the 1-RPV bottom head, the anti-breaking base plate of 2-, the 3-flow distribution device, the 4-energy absorbing device, the 6-circular port, the 7-attachment screw, the 8-square opening, the circular discharge orifice of 9-, 10-supports gusset.
Embodiment
Below in conjunction with the drawings and specific embodiments a kind of pressurized-water reactor flow distribution device described in the utility model is further described.
As shown in Figure 1, a kind of pressurized-water reactor flow distribution device described in the utility model, it is that the ball bowl-type is mesh-structured, and below, distributor bottom fixedly has 10, eight bearing ribs 10 of eight bearing ribs to be fixedly connected on below, distributor bottom by attachment screw 7.
Be rotation symmetric arrangement 10 row's round holes in distributor ball bowl circumferential side wall middle and upper part, every row's round hole comprises 100 circumferential uniform circular ports 6, each rows of openings diameter difference is 66mm, 64mm, 62mm, 60mm, 58mm, 56mm, 54mm, 52mm, 50mm and 48mm from top to bottom successively.
Be provided with the square discharge orifice of 3 rows at distributor ball bowl circumferential side wall bottom, distance center axle different radial distances place, the quantity of the square discharge orifice 8 of every row's circumferential arrangement is respectively 56,40 and 24 from outside to inside, is having supporting gusset 10 places not open square opening.
Offer the circular discharge orifice 9 that 9 diameters are 80mm in distributor ball bowl bottom central area.
Can be the isodiametric round hole of the many rows of rotation symmetric arrangement in the utility model in distributor ball bowl circumferential side wall middle and upper part, every row's round hole comprises several circumferentially uniform circular ports 6; Be provided with the square discharge orifice of three rows at distributor ball bowl circumferential side wall bottom, distance center axle different radial distances place, the square discharge orifice of every row comprises the square opening 8 of several circumferential arrangement; Offer several circular discharge orifices 9 in distributor ball bowl bottom central area.Regulate distribution effects and friction loss before cooling medium enters reactor core by size, quantity, shape, the position of change flow distribution device side and discharge orifice, bottom, distribute deviation allowable value, maximum average discharge, indexs such as pressure drop with the inlet flow rate that satisfies adjacent assemblies.
As shown in Figure 1, nuclear reactor flow distribution device 3 described in the utility model adopts the ball bowl-type mesh-structured, has the design discharge distributed uniform, and IVR metal volume abundance is convenient to characteristics such as maintenance overhaul and the vibration of reduction in-pile component.The appearance profile of this flow distribution device 3 adopts suitable streamlined design according to the flow performance of bottom chamber fluid, to be conducive to all even stable of lower chambers flow field.The anti-breaking base plate 2 of flow distribution device 3 and in-pile component has certain clearance, guarantees that energy absorbing device 4 can be realized function preferably under the reactor core fallen accident.Because the total metal volume is bigger, so can satisfy the IVR related request preferably.After this flow distribution device machines, this device is independently a part of as in-pile component, is fixed on during work on the RPV bottom head 1, and flow distribution device is connected by screw with the supporting gusset, for detachable, be convenient to flow distribution device is carried out maintenance and inspection.
Claims (5)
1. pressurized-water reactor flow distribution device, it is characterized in that: this nuclear reactor flow distribution device is that the ball bowl-type is mesh-structured, fixedly there are some bearing ribs (10) below, distributor bottom;
Be the rotation symmetric arrangement in distributor ball bowl circumferential side wall middle and upper part and arrange round hole more, every row's round hole comprises several circumferentially uniform circular ports (6); Be provided with the square discharge orifice of three rows at distributor ball bowl circumferential side wall bottom, distance center axle different radial distances place, the square discharge orifice of every row comprises the square opening (8) of several circumferential arrangement, is having supporting gusset (10) to locate not open square opening; Offer several circular discharge orifices (9) in distributor ball bowl bottom central area.
2. a kind of pressurized-water reactor flow distribution device according to claim 1, it is characterized in that: described bearing rib (10) has eight, is fixedly connected on below, distributor bottom by attachment screw (7).
3. a kind of pressurized-water reactor flow distribution device according to claim 1, it is characterized in that: be rotation symmetric arrangement (10) row round hole in distributor ball bowl circumferential side wall middle and upper part, every row's round hole comprises 100 circumferential uniform circular ports (6), each rows of openings diameter difference is 66mm, 64mm, 62mm, 60mm, 58mm, 56mm, 54mm, 52mm, 50mm and 48mm from top to bottom successively.
4. a kind of pressurized-water reactor flow distribution device according to claim 1, it is characterized in that: be provided with the square discharge orifice of 3 rows at distributor ball bowl circumferential side wall bottom, distance center axle different radial distances place, the quantity of the square discharge orifice (8) of every row's circumferential arrangement is respectively 56,40 and 24 from outside to inside, is having supporting gusset 10 places not open square opening.
5. a kind of pressurized-water reactor flow distribution device according to claim 1 is characterized in that: offer the circular discharge orifice (9) that 9 diameters are 80mm in distributor ball bowl bottom central area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200168075U CN203070788U (en) | 2013-01-14 | 2013-01-14 | Pressurized water nuclear reactor flow distribution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200168075U CN203070788U (en) | 2013-01-14 | 2013-01-14 | Pressurized water nuclear reactor flow distribution device |
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| Publication Number | Publication Date |
|---|---|
| CN203070788U true CN203070788U (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200168075U Expired - Lifetime CN203070788U (en) | 2013-01-14 | 2013-01-14 | Pressurized water nuclear reactor flow distribution device |
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| Country | Link |
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| CN (1) | CN203070788U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177780A (en) * | 2013-01-14 | 2013-06-26 | 上海核工程研究设计院 | Flow distribution device for pressurized-water nuclear reactor |
-
2013
- 2013-01-14 CN CN2013200168075U patent/CN203070788U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177780A (en) * | 2013-01-14 | 2013-06-26 | 上海核工程研究设计院 | Flow distribution device for pressurized-water nuclear reactor |
| CN103177780B (en) * | 2013-01-14 | 2015-11-25 | 上海核工程研究设计院 | A kind of pressurized-water reactor flow distribution device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. Address before: No.29, Hongcao Road, Xuhui District, Shanghai 200233 Patentee before: Shanghai Nuclear Engineering Research & Design Institute |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
|
| CX01 | Expiry of patent term |