CN116682584A - Integral suspension type reactor pressure vessel heat preservation layer structure - Google Patents
Integral suspension type reactor pressure vessel heat preservation layer structure Download PDFInfo
- Publication number
- CN116682584A CN116682584A CN202310516337.7A CN202310516337A CN116682584A CN 116682584 A CN116682584 A CN 116682584A CN 202310516337 A CN202310516337 A CN 202310516337A CN 116682584 A CN116682584 A CN 116682584A
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- CN
- China
- Prior art keywords
- pressure vessel
- reactor pressure
- runner
- radial
- steel lining
- 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.)
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- 239000000725 suspension Substances 0.000 title claims abstract description 24
- 238000004321 preservation Methods 0.000 title abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- 238000009413 insulation Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims abstract description 6
- 239000000498 cooling water Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 14
- 239000002184 metal Substances 0.000 description 11
- 238000009423 ventilation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/08—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/024—Supporting constructions for pressure vessels or containment vessels
-
- 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 invention belongs to the technical field of reactor pressure vessel design, and particularly relates to an integral suspension type reactor pressure vessel heat preservation structure. In the invention, the runner steel lining adopts a shell ring and end socket structure, the cylindrical section barrel is divided into a plurality of sections and is connected by welding, and the runner steel lining is matched with the outside of the reactor pressure vessel; the outer surface of the runner steel lining is welded with a plurality of layers of angle steel rings according to a certain interval, the heat insulation blocks are arranged on the angle steel rings, and the heat insulation blocks are connected by rivets; the upper and lower parts of the runner steel lining cylinder body are circumferentially and uniformly distributed with a plurality of radial hanging bosses, the reactor pressure vessel cylinder body is provided with radial supporting grooves matched with the radial hanging bosses, and the runner steel lining is fixed on the reactor pressure vessel cylinder body through the radial hanging bosses. The invention not only reduces the heat loss of the pressure vessel under the normal operation working condition, but also realizes the core water injection cooling function under the severe accident working condition.
Description
Technical Field
The invention belongs to the technical field of reactor pressure vessel design, and particularly relates to an integral suspension type reactor pressure vessel heat preservation structure.
Background
To address severe accidents of core fusion, the third generation nuclear reactor has introduced a cavity water injection cooling system. Under the severe accident working condition, cooling water flows through the outer surface of the reactor pressure vessel, and heat generated by melting of the reactor core is timely taken away, so that the reactor pressure vessel is prevented from being melted through. In order to realize the function, a runner steel lining (or called a guide plate) is additionally arranged between the reactor pressure vessel and the heat insulation layer, and a cooling water runner is formed with the outer surface of the pressure vessel. Thus, the third generation reactor pressure vessel insulation structure comprises two parts, namely an insulation block and a runner steel liner. The pressure vessel heat insulation block and the runner steel lining are composed of a plurality of plates, are spliced on site during installation, and are fixed on the pit embedded part through the support penetrating through the heat insulation block, so that a stable cooling water runner is established.
However, the above structure has three drawbacks due to its inherent properties:
1) Thermal insulation performance attenuation under normal operating conditions
Because the runner steel lining is fixed on the embedded part of the concrete wall through the support, the metal heat insulation block is required to be provided with a plurality of through passages for the support. Because of the requirement of mounting tolerance, a gap is unavoidably generated between the support and the metal heat insulation block. When cooling ventilation blows over the outer surface of the metal insulation block, convective heat transfer will take place with the cooling water flow path through this gap. In this way, on the one hand, the heat of the outer wall surface of the reactor pressure vessel is directly transferred into the reactor cavity; on the other hand, the cooling air quantity in the reactor cavity is lost by about 28 percent, the cooling effect of ventilation of the reactor cavity is weakened, and the heat loss of the reactor is increased, so that the temperature in the reactor cavity is increased. This heat loss due to the large number of partial gap heat release and ventilation losses is difficult to calculate by theory and experimentation.
2) Local temperature rise of pile pit concrete wall embedded part
Because the metal heat preservation blocks and the runner steel lining are all fixed on the metal embedded parts of the concrete wall of the inner wall of the pile cavity through a plurality of supports, the support components are all stainless steel structural parts, the heat resistance of metal is very low, heat is directly transferred to the concrete wall of the inner wall of the pile cavity through a plurality of support parts, and the local temperature of concrete at the support position is increased, even the temperature limit of the concrete at the pile pit is exceeded by 65 ℃. During normal operation of the reactor, the local temperature of the concrete at the heat-preserving supporting position is in a high-temperature state for a long time, so that extra burden is brought to a ventilation system of the reactor cavity, the self-organization performance of the concrete is deteriorated, and the bearing capacity is reduced.
3) High installation difficulty and long installation period
The runner steel lining is fixed on the concrete wall embedded plate through a support, and the connection mode between the support and the concrete embedded plate is welding. Because the construction tolerance of concrete and embedded parts thereof is larger, the manufacturing tolerance and the installation tolerance of the metal heat insulation block, the runner steel lining plate and the support are smaller, and the support and the embedded parts are easy to deform due to welding, the metal heat insulation, especially the support, is difficult to install, and the installation period is long (about 4-6 months). Meanwhile, the installation of the heat preservation layer occupies a main line of engineering construction, so that the installation period of main equipment is seriously influenced.
Disclosure of Invention
The invention solves the technical problem, and provides an integral suspension type reactor pressure vessel heat preservation layer structure, which not only reduces heat loss of the pressure vessel under normal operation working conditions, but also realizes a reactor core water injection cooling function under severe accident working conditions.
The invention adopts the technical scheme that:
the integral suspension type reactor pressure vessel insulation layer structure comprises an insulation block, a radial supporting groove, a runner steel liner, an angle steel ring and a radial suspension boss, wherein the runner steel liner adopts a cylindrical section and a seal head structure, a cylindrical section cylinder body is divided into a plurality of sections and is connected through welding, and the runner steel liner is matched with the outside of the reactor pressure vessel; the outer surface of the runner steel lining is welded with a plurality of layers of angle steel rings at certain intervals, the heat insulation blocks are arranged on the angle steel rings, and the heat insulation blocks are connected by rivets; the upper part and the lower part of the runner steel lining cylinder body are circumferentially and uniformly provided with a plurality of radial hanging bosses, the reactor pressure vessel cylinder body is provided with radial supporting grooves matched with the radial hanging bosses, and the runner steel lining is fixed on the reactor pressure vessel cylinder body through the radial hanging bosses.
The certain interval is 700-1000mm.
The bottom of the runner steel lining is provided with a through hole, and a water injection pipe passes through the through hole and is communicated with an annular cavity between the reactor pressure vessel and the runner steel lining.
And a steam-water discharge window is arranged at the top of the runner steel lining.
Under the working condition of serious accident, cooling water enters the annular cavity between the reactor pressure vessel and the runner steel lining from the water injection pipe, heat on the outer surface of the reactor pressure vessel is taken away, and the generated steam-water mixture is discharged from the steam-water discharge window at the top.
The upper and lower radial hanging bosses are arranged in a radial dislocation mode, and the radial supporting grooves are arranged in a radial dislocation mode.
The heat insulation block keeps a certain gap with the runner steel lining through the angle steel ring.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides an integral suspension type reactor pressure vessel heat preservation layer structure, which adopts an integral suspension type fixing structure to replace a support penetrating through a heat preservation block, so that a gap between the support and the heat preservation block and connection between a steel lining and a pit concrete drawing are avoided, the defects of weakening heat insulation performance of the heat preservation layer and local heating of a pit concrete wall caused by the support are overcome, and the heat insulation effect of the heat preservation layer is ensured.
(2) The invention provides an integral suspension type reactor pressure vessel heat preservation layer structure which is applied to severe accident working conditions of a reactor, and on the basis of providing heat preservation performance of the pressure vessel and cooling water flow passage functions, the heat preservation layer structure is modularized to reduce the installation difficulty of a metal heat preservation block and a flow passage steel lining and shorten the installation period.
(3) The invention provides an integral suspension type reactor pressure vessel heat preservation layer structure, which can be arranged outside a main equipment installation main line, wherein heat preservation plates are firstly arranged on angle steel at the periphery of a cylindrical steel lining and an end socket steel lining, then the integral heat preservation layer is hung into a pile pit, and the heat preservation layer is integrally fixed on a supporting boss of the outer wall of the pressure vessel through bolts before the pressure vessel is installed.
Drawings
Fig. 1 is a schematic view of an insulation layer structure of an integral suspension type reactor pressure vessel.
In the figure: 1-a reactor pressure vessel; 2-a pressure vessel insulation block; 3-stacking pit concrete walls; 4-a water injection pipe; 5-a soda water discharge window; 6-radial support grooves; 7-runner steel lining; 8-angle steel rings; 9-radial hanging boss.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the invention provides an integral suspension type reactor pressure vessel insulation layer structure, which comprises a reactor pressure vessel 1, a pressure vessel insulation block 2, a pit concrete wall 3, a water injection pipe 4, a steam-water discharge window 5, a radial supporting groove 6, a runner steel liner 7, an angle steel ring 8 and a radial suspension boss 9,
the runner steel lining 7 adopts a shell ring and end socket structure, the cylindrical section barrel is divided into a plurality of sections and is connected through welding, and the runner steel lining 7 is matched with the outside of the reactor pressure vessel 1; the support between the steel lining 7 and the pit concrete wall 3 is eliminated. The outer surface of the runner steel lining 7 is welded with a plurality of layers of angle steel rings 8 at certain intervals, wherein the certain intervals are 700-1000mm; the heat preservation blocks 2 are arranged on the angle steel rings 8, and the heat preservation blocks 2 are connected by rivets. The upper part and the lower part of the barrel body of the runner steel lining 7 are circumferentially and uniformly distributed with a plurality of radial hanging bosses 9 in a staggered manner, a radial supporting groove 6 matched with the radial hanging bosses 9 is formed in the barrel body of the reactor pressure vessel 1, and the runner steel lining 7 is fixed on the barrel body of the reactor pressure vessel 1 through the radial hanging bosses 9.
During installation, outside a main installation line of the main equipment, the heat-insulating plate 2 is firstly installed on the angle steel ring 8 at the periphery of the runner steel lining 7, then the whole heat-insulating layer is hung into a pile pit, the heat-insulating layer is fixed on the radial supporting groove 6 on the outer wall of the reactor pressure vessel 1 through the radial hanging boss 9 before the reactor pressure vessel 1 is installed, and finally the heat-insulating layer is hung into the pile pit along with the reactor pressure vessel 1 and the installation is completed.
The bottom of the runner steel lining 7 is provided with a through hole, the water injection pipe 4 passes through the through hole to be communicated with an annular cavity between the reactor pressure vessel 1 and the runner steel lining 7, the top of the runner steel lining 7 is provided with a steam-water discharge window 5,
under the severe accident condition, cooling water enters the annular cavity between the reactor pressure vessel 1 and the runner steel lining 7 from the water injection pipe 4, heat on the outer surface of the reactor pressure vessel 1 is taken away, and the generated steam-water mixture is discharged from the steam-water discharge window 5 at the top. In order to overcome the three defects of reduced heat insulation performance, local heating of a pit concrete wall, high installation difficulty and long period, an integral suspension type heat preservation layer structure is provided. The support for connecting the runner steel lining 7 with the pile pit concrete wall is canceled, the runner steel lining 7 is formed by connecting cylindrical sections and sealing heads, and a plurality of radial hanging bosses 9 are uniformly distributed on the upper part and the lower part of the cylinder body of the runner steel lining 7 in a circumferential staggered manner. Simultaneously, a plurality of radial supporting grooves 6 are respectively and circumferentially distributed at the upper part and the lower part of the cylinder body of the reactor pressure vessel 1 in a staggered way, and the integral runner steel liner 7 is fixed on the radial supporting grooves 6 of the reactor pressure vessel through radial hanging bosses 9 uniformly distributed on the cylinder sections of the runner steel liner 7. A plurality of layers of angle steel rings 8 are welded on the outer sides of cylindrical sections and sealing heads of the runner steel lining 7 according to a certain interval, the heat insulation blocks 2 are arranged on the angle steel rings 8, a certain gap is kept between the angle steel rings 8 and the runner steel lining 7, and the heat insulation blocks 2 are connected by rivets to form a whole.
The steel lining forming the cooling water flow passage is formed by connecting the cylindrical shell section and the end socket, and the whole steel lining is hung on a radial support groove of the reactor pressure vessel through a radial hanging boss and is not in direct contact with a concrete wall of a pile pit;
the upper and lower radial hanging bosses and the radial supporting grooves are uniformly arranged in a staggered manner;
the runner steel lining shell ring can be one section or a plurality of sections;
the outside of the runner steel lining shell ring and the end socket are provided with a plurality of angle steel rings at certain intervals, the metal heat insulation is arranged on the angle steel rings, and the gap distance between the metal heat insulation and the runner steel lining is controlled by the angle steel rings.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The integral suspension type reactor pressure vessel insulation layer structure is characterized by comprising an insulation block (2), a radial supporting groove (6), a runner steel liner (7), an angle steel ring (8) and a radial suspension boss (9), wherein the runner steel liner (7) adopts a cylindrical section and a seal head structure, a cylindrical section cylinder body is divided into a plurality of sections and is connected through welding, and the runner steel liner (7) is matched with the outside of the reactor pressure vessel (1); the outer surface of the runner steel lining (7) is welded with a plurality of layers of angle steel rings (8) according to a certain interval, the heat insulation blocks (2) are arranged on the angle steel rings (8), and the heat insulation blocks (2) are connected by rivets; the reactor pressure vessel is characterized in that a plurality of radial hanging bosses (9) are circumferentially and uniformly distributed at the upper part and the lower part of the cylinder body of the runner steel lining (7), radial supporting grooves (6) matched with the radial hanging bosses (9) are formed in the cylinder body of the reactor pressure vessel (1), and the runner steel lining (7) is fixed on the cylinder body of the reactor pressure vessel (1) through the radial hanging bosses (9).
2. The integrated suspension reactor pressure vessel insulation structure of claim 1, wherein the certain spacing is 700-1000mm.
3. The integral suspension type reactor pressure vessel insulation layer structure according to claim 1, wherein a through hole is formed at the bottom of the runner steel lining (7), and the water injection pipe (4) passes through the through hole to be communicated with an annular cavity between the reactor pressure vessel (1) and the runner steel lining (7).
4. A structure of an insulation layer of an integral suspension reactor pressure vessel according to claim 3, characterized in that the top of the runner steel lining (7) is provided with a steam-water discharge window (5).
5. The integral suspension type reactor pressure vessel insulation structure according to claim 4, wherein under severe accident conditions, cooling water enters the annular cavity between the reactor pressure vessel (1) and the runner steel lining (7) from the water injection pipe (4), heat of the outer surface of the reactor pressure vessel (1) is taken away, and the generated steam-water mixture is discharged from the steam-water discharge window (5) at the top.
6. The integral suspension reactor pressure vessel insulation structure of claim 1, wherein the upper and lower radial suspension bosses (9) are arranged in radial offset, and the radial support grooves (6) are arranged in radial offset.
7. The insulation layer structure of the integral suspension reactor pressure vessel according to claim 1, characterized in that the insulation blocks (2) are kept at a certain gap with the runner steel lining (7) through angle steel rings (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310516337.7A CN116682584A (en) | 2023-05-09 | 2023-05-09 | Integral suspension type reactor pressure vessel heat preservation layer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310516337.7A CN116682584A (en) | 2023-05-09 | 2023-05-09 | Integral suspension type reactor pressure vessel heat preservation layer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116682584A true CN116682584A (en) | 2023-09-01 |
Family
ID=87789893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310516337.7A Pending CN116682584A (en) | 2023-05-09 | 2023-05-09 | Integral suspension type reactor pressure vessel heat preservation layer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116682584A (en) |
-
2023
- 2023-05-09 CN CN202310516337.7A patent/CN116682584A/en active Pending
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