CN221057152U

CN221057152U - Integral forging stock for nuclear island reactor core surrounding cylinder

Info

Publication number: CN221057152U
Application number: CN202322595812.2U
Authority: CN
Inventors: 王元华; 马武江; 宣禹澄; 王玉琪
Original assignee: SHANGHAI XINMIN (DONGTAI) HEAVY FORGING CO Ltd
Current assignee: SHANGHAI XINMIN (DONGTAI) HEAVY FORGING CO Ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2024-05-31
Anticipated expiration: 2033-09-25

Abstract

The utility model relates to an integral forging stock of a nuclear island reactor core surrounding cylinder, which comprises a forging stock body, wherein blank sample sections are arranged at two ends of the forging stock body, and the forging stock body and the blank sample sections are cast into a whole; the wall surface of the inner wall of the forging stock body is a folded surface, and each concave folded angle k of the folded surface is positioned on the circumference with the radius R; the outer cylinder wall of the forging stock body is provided with a plurality of outer cylinder vertical edges, the outer edge surface of each outer cylinder vertical edge is an arc surface, the circle center O ₁ of a circle where the arc surface is located on a radius extension line passing through a corresponding concave folding angle k on the inner cylinder wall, the distance between the circle center O ₁ and the corresponding concave folding angle k is b, and the radius r= (1.5-2.0) b and R= (6-8) b of the circle where the outer cylinder vertical edges are located. The wall surface of the inner wall is a right-angle folded surface. The integral forging stock not only can form an integral structure with uniform internal tissues of the forging, but also has reasonable design of machining allowance and sample taking positions, and ensures near-net machining forming and the quality of a reactor core surrounding cylinder finished product.

Description

Integral forging stock for nuclear island reactor core surrounding cylinder

Technical Field

The utility model relates to a large forging blank of a key structural member of a nuclear power island, in particular to a reactor core surrounding cylinder forging blank with an integral structure in a nuclear island of a pressurized water reactor nuclear power station.

Background

The nuclear reactor internals belong to nuclear island reactor core equipment, are arranged in a pressure shell, and are internally provided with nuclear fuel assemblies, so that the internals must have various special properties and requirements, such as good corrosion resistance, high normal temperature and high temperature performance and performance stability under long-term service environment. The reactor core enclosure of the reactor internals is also a key part of the reactor core power equipment, and is characterized by large size, large weight, complex shape, large working load and high requirements on safety and reliability.

At present, the reactor core enclosure structure adopted by the main stream pressurized water reactor nuclear power plant at home and abroad mainly has two structural forms, namely a coaming-forming plate structure and a welding enclosure structure. The coaming-forming plate structure is largely connected by bolts and is loose-proof by a plurality of spot welds; the welded type enclosure structure has hundreds of butt welds and fillet welds, the welding workload is large, the requirement is high, and the welding points and the welding joints can form irradiation embrittlement under high irradiation so as to have failure risk. The stacked core surrounding tube is manufactured in a splicing mode no matter the surrounding plate is a forming plate structure or a welding surrounding tube structure, although the welding performance and the materials are greatly improved along with the development of material science, the splicing method can not always form complete metal streamline, uniformity of metal tissues can not be ensured, uneven stress distribution and stress concentration of structural members are extremely easy to cause, fatigue, creep and damage are generated, and great nuclear safety risks exist. The core surrounding barrel adopting the integral structure is necessary to design a forging blank with good manufacturability, the forging blank is required to reasonably design the sample position and reserve proper machining allowance, and the quality of the finished product of the integral core surrounding barrel is required to be ensured. Therefore, how to forge and form a large integral reactor core shroud forging is a technical problem which is always focused in the industry.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a nuclear island reactor core surrounding cylinder integral forging stock, which not only can form an integral structure with uniform internal tissues of a forging, but also has reasonable design of machining allowance and sample taking positions so as to ensure near-net machining forming and reactor core surrounding cylinder finished product quality.

In order to solve the technical problems, the nuclear island reactor core surrounding barrel integral forging stock comprises a forging stock body, wherein blank sample sections are arranged at two ends of the forging stock body, and the forging stock body and the blank sample sections are cast into a whole; the wall surface of the inner wall of the forging stock body is a folded surface, and each concave folded angle k of the folded surface is positioned on the circumference with the radius R; the outer cylinder wall of the forging stock body is provided with a plurality of outer cylinder vertical edges, the outer edge surface of each outer cylinder vertical edge is an arc surface, the circle center O ₁ of a circle where the arc surface is located on a radius extension line passing through a corresponding concave folding angle k on the inner cylinder wall, the distance between the circle center O ₁ and the corresponding concave folding angle k is b, and the radius r= (1.5-2.0) b and R= (6-8) b of the circle where the outer cylinder vertical edges are located.

In the structure, the forging stock body and blank sample sections at the two ends of the forging stock body are forged into a whole, so that an integrated integral forging structure is formed, and the integral forging forms a continuous and complete metal streamline, so that the uniformity of forging tissue and excellent mechanical properties are maintained, and the quality control requirements of nuclear pile components can be met. Because the inner cylinder wall surface of the forging stock body is a folded surface, not only is guiding circulation provided for the reactor coolant to pass through the reactor core, but also the radial flow speed or injection of the coolant entering the reactor core is limited, and meanwhile, the use requirement of accommodating and installing the inner member of the cylinder is met; the outer cylinder wall is provided with a plurality of outer cylinder vertical edges and is positioned on the radius of the concave folding angle, and the structure of the concave folding angle corresponding to the outer cylinder vertical edges not only meets the use requirement of the cylinder cavity folding surface wall, but also achieves the reinforcing effect, thereby ensuring the reliable mechanical property of the cylinder wall and ensuring the balance of the mechanical properties such as higher impact strength, impact toughness, plasticity, fracture toughness and the like of the cylinder wall. The outer edge surface of the vertical edge of the forging stock outer cylinder is an arc surface, the arc surface is similar to the near-final section shape and leaves reasonable machining allowance, blank sample sections are arranged at two ends of the forging stock body, and accuracy of blank detection results can be guaranteed.

In the preferred embodiment of the utility model, the wall surface of the inner cylinder wall adopts a symmetrical structure, and the wall surface of the inner cylinder wall is a right-angle folded surface. Not only can better meet the use requirement, but also is convenient for forging processing.

In a preferred embodiment of the utility model, the height h=2100 mm of the forging stock body; the blank sample section comprises a surface removal layer and a sample layer, wherein the thickness h=50 mm of the blank sample section and the thickness h ₁ =25 mm of the surface removal layer. The outer edge surface of the vertical edge of the outer cylinder is a semicircular arc surface. The radius R=1800-2300 mm of the circle where the concave folding angle k is located; the distance between the circle center O ₁ and the corresponding concave folding angle k is b=350-400 mm, and the radius r of the vertical edge of the outer cylinder is 200-220 mm.

Drawings

The utility model relates to a nuclear island reactor core shroud integral forging stock, which is further described below with reference to the accompanying drawings and the detailed description.

FIG. 1 is a front view of a block diagram of one embodiment of the nuclear island core shroud of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 1.

In the figure, 1-forging stock body, 2-blank sample section, 3-outer cylinder wall vertical edge, 4-cylinder cavity, 5-outer cylinder wall and 6-inner cylinder wall.

Detailed Description

As shown in fig. 1, the integral forging stock of the nuclear island reactor core surrounding cylinder is characterized in that a forging stock body 1 is a large stainless steel special-shaped integral member, and a cylinder wall with a special-shaped structure surrounds a cylinder cavity 4. The two ends of the forging stock body 1 are provided with blank sample sections 2, the blank sample sections 2 comprise surface removal layers and sample layers, the total thickness H of the blank sample sections 2 is=50 mm, the thickness H ₁ of the surface removal layers is=25 mm, and the total height H of the forging stock body 1 is=2100 mm.

As shown in fig. 2 and 3, the wall surface of the inner tube wall 6 of the forging stock body 1 is forged into a stepped right-angle folded surface by a square forging die rod, and the inner tube wall surface of the right-angle folded surface is symmetrical to the longitudinal and transverse axes of the tube cavity 4, namely, has the same tube wall structure in four quadrants divided by a longitudinal axis and a transverse axis, and has four stepped folded surfaces in the inner wall surface of any quadrant, so that four concave folded angles k far from the center line O of the tube cavity 4 and three convex folded angles near the center line O of the tube cavity 4 are formed.

The concave angle k of the inner cylinder wall 6, which is remote from the centre line O of the cylinder chamber 4, is located on the same circumference, the radius r=1700 mm of which. The outer cylinder wall 5 and the circumference are concentric circles, and the distance b=290 mm between the corner ridge line of each concave corner k and the outer cylinder wall 5. The outer cylinder wall 5 of the forging stock body 1 is provided with 12 outer cylinder wall vertical edges 3 which are arranged along the vertical direction, the outer edge surfaces of the outer cylinder wall vertical edges 3 are semicircular cambered surfaces, the circle center of the circle where the semicircular cambered surfaces are positioned is positioned at the intersection point O ₁ of the corresponding concave folding angle k on the inner cylinder wall 6 and the circle where the outer cylinder wall 5 is positioned, and the radius r=350 mm of the circle where the outer cylinder vertical edges 3 are positioned.

The above-described embodiment of the present utility model is given, but the present utility model is not limited thereto. The radius R of the circle where the concave bevel k of the inner cylinder wall 6 is positioned is preferably 1800-2300 mm according to the design and specific structure of the finished reactor core enclosure; the distance between the circle center O ₁ and the corresponding concave folding angle k is preferably 350-400 mm, and the radius r of the outer cylinder vertical edge 3 on the outer cylinder wall 5 is preferably 200-220 mm.

Claims

1. The utility model provides a nuclear island reactor core enclosure whole forging stock, includes forging stock body (1), its characterized in that: the two ends of the forging stock body (1) are provided with blank sample sections (2), and the forging stock body (1) and the blank sample sections (2) are cast into a whole; the wall surface of the inner wall (6) of the forging stock body (1) is a folded surface, and each concave folded angle k of the folded surface is positioned on the circumference with the radius R; the forging stock body (1) is characterized in that a plurality of outer barrel vertical edges (3) are arranged on an outer barrel wall (5), the outer edge surface of each outer barrel vertical edge (3) is an arc surface, the circle center O ₁ of a circle where the arc surface is located on a radius extension line passing through a corresponding concave folding angle k on an inner barrel wall (6), the distance between the circle center O ₁ and the corresponding concave folding angle k is b, and the radius r= (1.5-2.0) b and R= (6-8) b of the circle where the outer barrel vertical edges (3) are located.

2. The nuclear island core shroud unitary forging of claim 1, wherein: the wall surface of the inner cylinder wall (6) adopts a symmetrical structure, and the wall surface of the inner cylinder wall (6) is a right-angle folded surface.

3. The nuclear island core shroud unitary forging of claim 1, wherein: -height h=2100 mm of the forging stock body (1); the blank sample section (2) comprises a surface removal layer and a sample layer, wherein the thickness h=50 mm of the blank sample section (2) and the thickness h ₁ =25 mm of the surface removal layer.

4. The nuclear island core shroud unitary forging of claim 1, 2, or 3, wherein: the outer edge surface of the outer cylinder vertical edge (3) is a semicircular arc surface.

5. The nuclear island core shroud unitary forging of claim 1, wherein: the radius R=1800-2300 mm of the circle where the concave folding angle k is located;

The distance between the circle center O ₁ and the corresponding concave folding angle k is b=350-400 mm, and the radius r of the circle where the vertical edge (3) of the outer cylinder is located is 200-220 mm.