KR20160060134A - Steam generator and method of securing tubes within a steam generator against vibration - Google Patents

Abstract

The steam generator 2 includes a tube bundle 200, 300, 500 having a plurality of tubes arranged in rows and columns. The first row 210, 310, 510 of tubes includes a first tube 212, 312 having a curved centerline 214 disposed in a first plane 216, 316, 516. The second row of tubes 230,330 and 530 includes a second tube 232,332 having a curved centerline 234 disposed in a second plane 236,336 and 536, Parallel to the first plane and spaced apart from the first plane by distances 206, The steam generator further includes a first plurality of solid vibration-proof bars (220, 320, 520) disposed between the first row of tubes and the second row of tubes, each tube having a tube outer diameter (204, 304 , Each of the first plurality of anti-vibration bars having a thickness (222, 322, 522) that is generally transverse to the first plane and the second plane, the thickness of which is between the first plane and the second plane It is larger than the distance minus the tube diameter.

Description

TECHNICAL FIELD [0001] The present invention relates to a steam generator and a method for fixing a tube in a steam generator against vibration. BACKGROUND OF THE INVENTION [0002]

The disclosed concept relates generally to steam generators, and more particularly to a steam generator including an anti-vibration bar. The disclosed concept also relates to a method of securing a tube in a steam generator against vibration using a plurality of anti-vibration bars.

Heat exchangers with tube bundles are commonly employed in pressurized water nuclear reactor systems. The steam generator typically comprises a vertically oriented shell, a tube bundle formed by a tube that includes two vertical components each meeting at a bend portion, a tube sheet for supporting the tube at the end opposite the bend, a partition plate cooperating with the tube sheet and a primary fluid inlet header at one end of the tube bundle and a primary fluid outlet header at the other end of the tube bundle, Shaped channel head. The primary fluid inlet nozzle is in fluid communication with the primary fluid inlet header, and the primary fluid outlet nozzle is in fluid communication with the primary fluid outlet header. The secondary side of the steam generator is a wrapper disposed between the tube bundle and the shell and defining an annular chamber comprised of an outer shell and an inner wrapper, the wrapper and a feedwater ring disposed above the bend of the tube bundle ).

The primary fluid heated by the circulation through the reactor core enters the steam generator through the primary fluid inlet nozzle. From the primary fluid inlet nozzle, the primary fluid is directed through the primary fluid inlet header, through the interior of the tube bundle, out of the primary fluid outlet header, through the primary fluid outlet nozzle, to the reactor coolant pump for recirculation. At the same time, the feedwater is introduced to the secondary side of the steam generator through the feed nozzle connected to the feedwater ring inside the steam generator. Upon entering the steam generator, the feedwater is mixed with water returning from a moisture separator located on the tube bundle, referred to as the recycle stream. This mixture, referred to as downcomer flow, is guided beneath the annular chamber between the shell and the wrapper, which allows the tube sheet near the bottom of the annular chamber to change direction causing heat exchange with the exterior of the tube Until it passes up through the inside of the wrapper. While the water is circulating in the heat exchange relationship with the tube bundle, heat is transferred from the primary fluid in the tube to the water around the tube so that a portion of the water outside the tube is converted to steam. The steam-water mixture then rises and is guided through a number of wet separators that separate any entrained water from the vapor, which then escapes from the steam generator and is typically circulated through the turbine generator Electricity is generated in a known manner.

The portion of the steam generator which includes most of the tube bends and below the channel head is typically referred to as the evaporator section. The portion of the steam generator on the tube containing the wet separator is typically referred to as a steam drum. The feedwater enters the steam generator through an inlet nozzle disposed in the upper portion of the cylindrical shell. The feedwater is dispensed, mixed with the water removed by the wet separator, and then flows under an annular channel surrounding the tube bundle.

The tube is supported at its open end by conventional means for welding the end of the tube to a tube sheet disposed generally transversely to the longitudinal axis of the steam generator. In order to support the straight sections of the tubing, a series of tube support plates or grids arranged in axially spaced relation to one another are provided along straight portions of the tube. With regard to tube bundles, the various steam generators utilize different tube configurations, for example the curves are curved or U-shaped, or the vertical components of the tube are each curved at an acute angle to form a relatively horizontal bend.

Typically, a plurality of anti-vibration bars disposed between the tubes of each column are located within the bend of the tube. The anti-vibration bar provides support and does not substantially interfere with the flow of vapor containing wetting. The anti-vibration bar is intended to prevent excessive vibration of the individual tubes of the entire tube bundle, which can potentially damage the tube. It is well known that the bend of the tube bundle is more severely affected by vibration, and due to the flexure configuration, it is more difficult to adequately support to eliminate vibration.

The typical motion of the tube experiencing normal vibration is transverse to the plane of the U-curve, and such vibration is therefore referred to as out-of-plane vibration. Under unusual conditions, the tube may also experience in-plane vibrations. In such a situation, adjacent tubes in a given row may contact each other, resulting in severe damage to the tube. Fabrication and assembly of tube bundles is a major obstacle to mechanical solutions to these problems. For this reason, current anti-vibration bar assembly designs do not significantly limit the in-plane motion of the tube.

These and other needs are met by the disclosed concept that a solid anti-vibration bar with increased thickness is structured to be located within the tube bundle.

According to one aspect of the disclosed concept, a steam generator is provided. The steam generator has a primary side for circulating the heated fluid and a secondary side for circulating the fluid to be heated by the heated fluid circulating on the primary side. The steam generator includes a channel head for receiving the heated fluid; A tube sheet separating the channel head from the secondary side; A tube bundle having a plurality of tubes arranged in rows and columns, said tube bundles extending from a channel head, through a tube sheet, and through at least a portion of a secondary side; And a first plurality of solid state anti-vibration bars. The plurality of tubes include a first row of tubes and the first row of tubes includes a first tube having a curved centerline disposed in a first plane. The plurality of tubes further include a second row of tubes, each of the first plurality of anti-vibration bars disposed between a first row of tubes and a second row of tubes. The second row of tubes includes a second tube having a curved centerline disposed in a second plane, the second plane being parallel to the first plane and spaced a predetermined distance from the first plane. Each tube has a tube outer diameter. The first plurality of anti-vibration bars each have a thickness that is generally transverse to the first plane and the second plane. The thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first plane and the second plane minus the tube outer diameter.

According to another aspect of the disclosed concept there is provided a method for securing a tube in a steam generator against vibration, the tube being arranged in rows and columns and having a lane between the rows, There is provided a method for securing a tube in a container. The method includes providing a first row of tubes including a first tube having a curved centerline disposed in a first plane; Providing a first plurality of solid vibration-resistant bars; And a second row of tubes, wherein each of the first plurality of anti-vibration bars is disposed between a first row of tubes and a second row of tubes, and the second row of tubes comprises a curve And a second tube having a shaped centerline, the second plane being parallel to the first plane and spaced a predetermined distance from the first plane. Each tube has a tube outer diameter. The first plurality of anti-vibration bars each have a thickness that is generally transverse to the first plane and the second plane. The thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first plane and the second plane minus the tube outer diameter.

A full understanding of the concepts disclosed from the following description of the preferred embodiments when read in conjunction with the accompanying drawings can be obtained.

1 is a partially cutaway perspective view of a vertical tube and shell steam generator,
2 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having a vibration-
3 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having an anti-vibration bar according to an embodiment of the disclosed concept;
Figure 4a is a schematic front view of a plurality of tubes of the tube bundle of Figure 3,
Figure 4b is a schematic side view of the tube of Figure 4a,
Figure 4c is a schematic isometric view of the tube of Figure 4a,
5 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having an anti-vibration bar according to an alternative embodiment of the disclosed concept,
6A is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having an anti-vibration bar according to a further embodiment of the disclosed concept,
Figure 6b is a schematic cross-sectional view of the tube bundle of Figure 6a with the anti-vibration bar displaced, and
7 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having an anti-vibration bar according to a further embodiment of the disclosed concept.

Referring now to the drawings, FIG. 1 illustrates a plurality of heat exchanger tubes 3 that form tube bundles 4 to provide the heating surface necessary to transfer heat from the primary fluid to vaporize or boil the secondary fluid. The steam generator 2 shown in FIG. The steam generator 2 comprises a vertically oriented tubular shell portion 6 and an upper enclosure or dish-like head 8 surrounding the upper end and a generally hemispherical-shaped channel head 10 surrounding the lower end And a vessel having the same. The lower shell portion 6 is smaller in diameter than the upper shell portion 12 and the frustoconical-shaped transition portion 14 connects the upper portion and the lower portion. A tube sheet 16 is attached to the channel head 10 and has a plurality of apertures 18 disposed therein for receiving the ends of the tube 3. A dividing plate 22 is centrally disposed in the channel head 10 and divides the channel head 10 into two compartments 24 and 26 which divide the tube bundle 4 As a header. The compartment 26 is a primary fluid inlet compartment and has a primary fluid inlet nozzle 27 in fluid communication with the inlet compartment. The compartment 24 is a primary fluid outlet compartment and has a primary fluid outlet nozzle 28 in fluid communication with the outlet compartment. Thus, the primary fluid entering the fluid compartment 26, or reactor coolant, flows through the tube bundle 4 and flows out through the outlet nozzle 28.

The tube bundle 4 is surrounded by a wrapper 30 which forms an annular passage 32 between the wrapper 30 and the shell and transition portions 6 and 14 respectively. The upper portion of the wrapper 30 is covered by a lower deck plate 34 that includes a plurality of openings 36 in fluid communication with a plurality of riser tubes 38. A swirl vane 40 is disposed in the riser tube 38 to cause the vapor flowing through the riser tube 38 to be pivoted so that as it flows through this primary centrifuge, Remove some of them by centrifugal force. The water separated from the steam in this primary separator is returned to the upper surface of the lower deck plate 34. After flowing through the primary centrifuge, the steam passes through the secondary separator 42 before reaching the steam outlet nozzle 44 centrally located in the dish-shaped head 8. The water separated from the steam in the secondary separator 42 is returned and mixed with the water returned from the primary separator on the lower deck plate 34.

The water inlet structure of this steam generator 2 includes a water inlet nozzle 46 having a generally horizontal portion called a water supply ring 48 and a discharge nozzle 50 raised above the water supply ring 48 do. The water supplied through the water inlet nozzle 46 passes through the water supply ring 48, escapes through the discharge nozzle 50, and is mixed with the water that has been separated from the steam and recirculated. The mixture then flows down onto the lower deck plate 34 and into the annular precipitation channel 32. The water then enters the tube bundle 4 at the lower part of the wrapper 30 and flows between the tubes 3 and over the tube bundle 4, where it is heated to generate steam.

As mentioned above, the tube bundle 4 has a plurality of anti-vibration bars (not shown in FIG. 1) positioned between the tubes 3. Figure 2 shows a portion of a tube bundle 100 comprising a plurality of rows of tubes 110,130, Anti-vibration bar 120 is positioned between the first row 110 of tubes and the second row 130 of tubes. Anti-vibration bar 140 is positioned between the second row 130 of tubes and the third row 150 of tubes. The anti-vibration bar 120 has a thickness 122 and the anti-vibration bar 140 has a thickness 142. As shown, since the anti-vibration bars 120, 140 are linear, the thicknesses 122, 142 are limited by the distance 101 between the rows 110, 130, 150 of the tube. As a result, in operation, the anti-vibration bars 120, 140 do not significantly reduce the amount of in-plane motion possible within the rows 110, 130, 150 of the tube.

As will be discussed with respect to Figures 3-7, in-plane vibration can be greatly reduced by including a number of improved anti-vibration bars 220, 240, 320, 460, 480, 3, there is shown a cross-section of a portion within a U-shaped bend of a tube bundle 200 of a steam generator (not shown). The tube bundle 200 includes a plurality of tube rows 210,230 and 250 wherein any two adjacent tubes have the same distance 203 between their centers (e.g., a triangular pitch) (accompanied by tolerance). It will be appreciated that although the disclosed concept will be described with reference to a triangular pitch, it will be appreciated that the disclosed concept may be employed in alternative orientations (e.g., tube bundles (not shown) with tubes having a square pitch rotated by 45 degrees, Will be.

The first row 210 of tubes may be in the middle of the tube bundles 200 or may be at the ends. Anti-vibration bar 220 is positioned between the first row 210 of the tube and the second row 230 of the tube. The anti-vibration bar 220 is solid and has a thickness 222. Referring to Figures 3 to 4C, the first row 210 of tubes includes a tube 212 having a curved centerline 214 located within a plane 216. Similarly, the second row 230 of tubes includes a tube 232 having a curved centerline 234 located in a plane 236. As shown in FIG. 3, the plane 216 and the plane 236 are parallel and spaced apart by a distance 206. The distance 206 is substantially equal to twice the outer radius 202 (e.g., tube outer diameter 204) + distance 201). The distance 201 corresponds to the distance 101 shown in Fig.

As shown in FIG. 3, the thickness 222 of the anti-vibration bar 220 is generally transverse to the planes 216, 236 and is greater than the distance 201 between the rows 210, 230 of the tube. 3, a second anti-vibration bar 240 is positioned between the second row 230 of the tube and the third row 250 of the tube. Similar to the anti-vibration bar 220, the anti-vibration bar 240 is solid and has a thickness 242. Referring to Figures 3 to 4C, the third row 250 of tubes includes a tube 252 having a curved centerline 254 located in a plane 256. The plane 256 is parallel to the plane 236 and spaced from it by a distance 208. The distance 208 is substantially equal to two times the radius 202 (e.g., tube outer diameter 204) + distance 201 '.

Similar to the thickness 222 of the anti-vibration bar 220, the thickness 242 of the anti-vibration bar 240 is generally transverse to the plane 236, 256, As shown in FIG. In operation, this increased thickness prevents movement in significant planes (e.g., see planes 216, 236, 256) in the rows 210, 230, 250 of the tube, 0.0 > 200, < / RTI > As shown in Figure 3, the anti-vibration bar 220 is curved and includes a plurality of bends 224 structured to meander between the first row 210 of tubes and the second row 230 of tubes do.

Similarly, the anti-vibration bar 240 is curved and includes a plurality of bends 244 structured to meander between the second row 230 of tubes and the third row 250 of tubes. The flexures 224 and 244 enable the thicknesses 222 and 242 of the anti-vibration bars 220 and 240 to be greater than the thicknesses 122 and 142 of the anti-vibration bars 120 and 140.

In addition, the thicknesses 122, 142 of the anti-vibration bars 120, 140 are not greater than the distance 101, while the thicknesses 222, 242 of the anti-vibration bars 220, (For example, the tube outer diameter 204) of the radius 202 in the inner tube 203 is subtracted.

Figure 5 illustrates a portion within a U-shaped bend of a tube bundle 300 of a steam generator (not shown) according to an alternative embodiment of the disclosed concept. As shown, the tube bundle 300 includes a vibration-preventing bar 320 positioned between the first row 310 of tubes and the second row 330 of tubes. The first row 310 of tubes may be in the middle of the tube bundle 300 or may be at the end. In addition, the first row 310 of tubes includes a tube 312 having a curved centerline (not shown) located within the plane 316. The second row 330 of tubes includes a tube 332 having a curved centerline (not shown) located in plane 336. The plane 336 is parallel to the plane 316 and spaced from it by a distance 306. Similar to the anti-vibration bars 220 and 240, the anti-vibration bar 320 has a thickness 322. The thickness 322 is generally transverse to the planes 316 and 336 and is greater than the distance 301 between the rows 310 and 330 of the tube.

As shown, distance 301 corresponds to distance 306 minus twice the radius 302 (e.g., tube outer diameter 304). In a manner similar to the anti-vibration bars 220 and 240, the anti-vibration bar 320 is structured to meander between the first row 310 of tubes and the second row 330 of tubes. However, the anti-vibration bars 220 and 240 include a plurality of curved bends 224 and 244, while the anti-vibration bar 320 includes a plurality of bends 324 that are substantially serpentine. The bend 324 of the anti-vibration bar 320 may be configured such that the anti-vibration bar 320 has an increased thickness 322, similar to the bends 224, 244 of the anti-vibration bars 220, Allow. In addition, the increased thickness 322 of the anti-vibration bar 320, when in operation, similar to the anti-vibration bars 220 and 240, (See planes 316, 336) motion, which advantageously corresponds to a significant reduction in in-plane vibration in tube bundle 300. [

Figure 6a shows a portion within a U-shaped bend of a tube bundle 400 that includes a plurality of anti-vibration bars 460, 480. The anti-vibration bar 460 is positioned between the first row 410 of the tube and the second row 430 of the tube. The first row of tubes 410 may be in the middle of the tube bundles 400 or may be at the ends. The anti-vibration bar 480 is positioned between the second row 430 of the tube and the third row 450 of the tube. Similar to the anti-vibration bars 220 and 240, the anti-vibration bars 460 and 480 include a plurality of bends 464 and 484 structured to meander between the rows 410, 430 and 450 of the tube. do. However, the anti-vibration bars 460, 480 are less thick than the anti-vibration bars 220, 240.

6A, the first row 410 of the tube includes a tube 412 and the second row 430 of tubes includes a tube 432, which is coupled to a tube (not shown) 412, and 432, respectively. There is a gap (e.g., see gap 467) between the vibration-preventing bar 460 and the tubes 412 and 432 because the vibration-preventing bar 460 is less thick. Similarly, the anti-vibration bar 480 is positioned adjacent to the tube 432 and each tube in the third row 450 of tubes. Since the anti-vibration bar 480 is less thick, there is a gap (e.g., a gap) between the anti-vibration bar 480 and the tube in the second row of tubes 430 and the third row of tubes 450 487)) exists.

As shown, the anti-vibration bar 460 is positioned substantially along the longitudinal axis 465 and the anti-vibration bar 480 is positioned substantially along the longitudinal axis 485. Figure 6B shows a portion of a tube bundle 400 ', in which vibration-preventing bars 460 and 480 are displaced along longitudinal axes 465 and 485. As shown in FIGS. 6A and 6B, the anti-vibration bar 460 is displaced in the first direction 461 along the longitudinal axis 465. The anti-vibration bar 480 is displaced in the second direction 481 along the longitudinal axis 485. The first direction 461 and the second direction 481 are substantially parallel to each other and opposite to each other. The anti-vibration bars 460 and 480 may be displaced by the operator after manufacture of the tube bundle or by being pulled out or pushed out by use of suitable mechanisms known in the art.

As shown in Figure 6b, as the anti-vibration bar 460 moves in the first direction 461 along the longitudinal axis 465, the anti-vibration bar 460 engages the tube 412, (Or the gap 467 shown in Fig. 6A is substantially reduced in size). Similarly, as the anti-vibration bar 480 moves in the second direction 481 along the longitudinal axis 485, the anti-vibration bar 480 engages the tube 432, leaving no gap Or the gap 487 shown in FIG. 6A is substantially reduced in size). In this manner, the gap between the vibration-preventing bars 460, 480 and the tubes in the tubes 410, 430, 450 of the tube (see for example gaps 467, 487 in FIG. 6A) , Further reducing the amount of in-plane motion possible.

Figure 7 illustrates a portion within a U-shaped bend of a tube bundle 500 of a steam generator (not shown) according to an alternative embodiment of the disclosed concept. As shown, the tube bundle 500 includes a plurality of rows of tubes 510, 530, and 550. The first row 510 of tubes may be in the middle of the tube bundle 500 or may be at the end. Anti-vibration bar 520 is positioned between the first row 510 of tubes and the second row 530 of tubes. The anti-vibration bar 520 is substantially similar to the anti-vibration bar 220, 240 and is substantially transverse to the plane 516, 536 and less than the distance 501 between the columns 510, 530 of the tube And has a large thickness 522.

An anti-vibration bar 540 substantially similar to the anti-vibration bars 120, 140 shown in FIG. 2 is positioned between the second row 530 of the tube and the third row 550 of the tube. The anti-vibration bar 540 has a thickness 542 that is generally transverse to the plane 536 parallel to the plane 556 and spaced a distance 508 from the bar 540. The thickness 542 of the anti-vibration bar 540 is less than the thickness 522 of the anti-vibration bar 520. Similar to thicknesses 122 and 142 of anti-vibration bars 120 and 140, thickness 542 is limited by distance 501 and may be substantially the same as distance 501 but not greater. As shown, the anti-vibration bar 540 is substantially straight and does not have a curvature or curvature along its longitudinal axis.

In this way, by including the anti-vibration bar 520, the in-plane vibration in the tube bundle 500 can be greatly reduced, and at the same time, the vibration-preventing bar 540 The cost can advantageously be saved. Figure 7 illustrates one of many alternative embodiments within the scope of the disclosed concepts. For example and without limitation, it is contemplated to have a number of anti-vibration bars 220, 240, 320, 460, 480, 520 arranged in any configuration with the conventional anti-vibration bars 120, 140, Is within the scope of the disclosed concept. Additionally, it is contemplated that the anti-vibration bars 220, 240, 320, 460, 480, 520, 540 may be formed of structures or structures (not shown) extending around the tube bundle bend in one of several ways known in the art Not shown).

The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. In order to best explain the principles of the invention and its practical application and to enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated, . It is intended that the appended claims be construed to cover other alternative embodiments of the invention, except as so limited by the prior art.

As used herein, the term "solid" shall mean having no internal cavity or opening. As used herein, the term "number" shall mean an integer of 1 or greater than 1 (i.e., plural).

Claims (15)

1. A steam generator (2) having a primary side for circulating a heated fluid and a secondary side for circulating a fluid to be heated by the heated fluid circulating on the primary side,
A channel head (10) for receiving the heated fluid;
A tube sheet (16) separating the channel head from the secondary side;
CLAIMS What is claimed is: 1. A tube bundle (200, 300, 500) having a plurality of tubes arranged in rows and columns, the tube bundle comprising at least a portion of the channel head, Said tube bundle extending through said tube bundle; And
A first plurality of solid anti-vibration bars (220, 320, 520)
The plurality of tubes may include:
The first row of tubes 210, 310, 510 including the first tubes 212, 312 having the curved centerline 214 disposed in the first plane 216, 316,
Wherein each of said first plurality of anti-vibration bars is disposed between a first row of said tubes and a second row of said tubes, and wherein said second rows of tubes (230, 330, 530) And a second tube (232, 332) having a curved centerline (234) disposed in a second plane (236, 336, 536), the second plane being parallel to the first plane (230, 330, 530) of said tube, spaced apart from said second row (206, 306)
Each of the tubes has a tube outer diameter (204, 304)
Wherein each of said first plurality of anti-vibration bars has a thickness (222, 322, 522) that is generally transverse to said first plane and said second plane,
Wherein the thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first plane and the second plane minus the tube outer diameter
Steam generator. The method according to claim 1,
Wherein each of said first plurality of anti-vibration bars (220, 520) includes a plurality of bends (224, 524), wherein each of said first anti- (210, 510) and the second row of tubes (230, 530), wherein the bend of each of said first plurality of anti-vibration bars is curved
Steam generator. The method according to claim 1,
Wherein each of the first plurality of vibration-preventing bars (320) includes a plurality of bends (324), wherein each bend of the first plurality of vibration-preventing bars comprises a first row (310) (330), wherein the bend of each of the first plurality of anti-vibration bars is substantially serpentine
Steam generator. The method according to claim 1,
The steam generator (2) further comprises a second plurality of solid vibration-proof bars (240)
Said plurality of tubes further comprising a third row of tubes (250)
Wherein each of said second plurality of anti-vibration bars is disposed between a second row of said tubes and a third row of said tubes,
The third row of tubes includes a third tube 252 having a curved centerline 254 disposed in a third plane 256,
The third plane is parallel to the second plane 236 and is spaced from the second plane 236 by a distance 208,
Wherein each of said second plurality of anti-vibration bars has a thickness (242) that is generally transverse to said second plane and said third plane,
Wherein the thickness of each of the second plurality of anti-vibration bars is greater than a distance between the second plane and the third plane minus the tube outer diameter (204)
Steam generator. 5. The method of claim 4,
Wherein the plurality of tubes have a triangular pitch and the tube bundle includes a U-shaped bend, wherein the first plurality of vibration-preventing bars and the second plurality of vibrating- Each of the barrier bars 240 is disposed within the U-
Steam generator. 5. The method of claim 4,
Wherein the plurality of tubes have a rotated square pitch and the tube bundle (200) includes a U-shaped bend, wherein the first plurality of vibration-preventing bars (220) and the second plurality Each of the anti-vibration bars 240 of the U-
Steam generator. The method according to claim 1,
The steam generator (2) further comprises a second plurality of anti-vibration bars (540)
Said plurality of tubes further comprising a third row of tubes 550,
Wherein each of said second plurality of anti-vibration bars is disposed between a second row (530) of said tube and a third row of said tube,
The third row of tubes includes a third tube having a curved centerline disposed in a third plane 556,
The third plane is parallel to the second plane 536 and is spaced a distance 508 from the second plane 536,
Wherein each of said second plurality of anti-vibration bars has a thickness (542) that is generally transverse to said second plane and said third plane,
The thickness of each of the second plurality of anti-vibration bars is less than the thickness (522) of each of the first plurality of anti-vibration bars (520)
Steam generator. 8. The method of claim 7,
The thickness 542 of each of the second plurality of anti-vibration bars 540 is substantially equal to the distance 508 between the second plane 536 and the third plane 556 minus the tube outer diameter
Steam generator. A method of securing a tube in a steam generator (2) against vibration, the tube being arranged in rows and columns and disposed in a tube bundle (200, 300, 400, 400 ', 500) ) In the steam generator (2), the method comprising the steps of:
(210, 310, 410, 510) comprising a first tube (212, 312, 412) having a curved centerline (214) disposed in a first plane (216, 316, 516) ;
Providing a first plurality of solid vibration-proof bars (220, 320, 460, 520); And
Providing a second row of tubes 230, 330, 430, 530, wherein each of the first plurality of anti-vibration bars is disposed between a first row of the tubes and a second row of the tubes, The second row of the first plane includes a second tube 232, 332, 432 having a curved centerline 234 disposed in a second plane 236, 336, 536, Providing a second row of tubes (230, 330, 430, 530) parallel and spaced apart from the first plane by a distance (206, 306)
Each of the tubes has a tube outer diameter 204, 304,
Wherein each of said first plurality of anti-vibration bars has a thickness (222, 322, 522) that is generally transverse to said first plane and said second plane,
Wherein the thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first plane and the second plane minus the tube outer diameter
A method for securing a tube in a steam generator. 10. The method of claim 9,
Wherein each of said first plurality of anti-vibration bars (220, 460, 520) includes a plurality of bends (224, 464, 524), said bends of each of said first plurality of anti- Wherein the curvature of each of the first plurality of vibration-preventing bars is curved between a first row (210, 410, 510) and a second row (230, 430, 530)
A method for securing a tube in a steam generator. 10. The method of claim 9,
Wherein each of the first plurality of vibration-preventing bars (320) includes a plurality of bends (324), wherein each bend of the first plurality of vibration-preventing bars comprises a first row (310) (330), wherein the bend of each of the first plurality of anti-vibration bars is substantially serpentine
A method for securing a tube in a steam generator. 10. The method of claim 9,
Providing a second plurality of solid vibration-proof bars (240, 480); And
Providing a third row of tubes (250, 450), each of the second plurality of vibration-preventing bars being disposed between a second row (230, 430) of the tube and a third row of the tube, Wherein the third row of tubes includes a third tube (252) having a curved centerline (254) disposed in a third plane (256), the third plane being parallel to the second plane (236) Further comprising providing a third row (250, 450) of the tube spaced a distance (208) from the second plane (236)
Wherein each of said second plurality of anti-vibration bars has a thickness (242) that is generally transverse to said second plane and said third plane,
Wherein the thickness of each of the second plurality of anti-vibration bars is greater than a distance between the second plane and the third plane minus the tube outer diameter (204)
A method for securing a tube in a steam generator. 13. The method of claim 12,
The first plurality of anti-vibration bars (460) comprise a first anti-vibration bar disposed substantially along a first longitudinal axis (465), and the second plurality of anti-vibration bars (480) And a second anti-vibration bar disposed along a second longitudinal axis (485) parallel to the first longitudinal axis, the first anti-vibration bar comprising a first anti- And the second anti-vibration bar is disposed adjacent to the second tube and the third tube, wherein a first gap is formed between the first anti-vibration bar and the first tube There is a second gap between the first anti-vibration bar and the second tube, a third gap 487 between the second anti-vibration bar and the second tube, A fourth gap is present between the second anti-vibration bar and the third tube,
Displacing the first anti-vibration bar in a first direction (461) along the first longitudinal axis; And
(481) along the second longitudinal axis, wherein the second direction is opposite to the first direction, and wherein the first gap, Wherein each of the first gap, the third gap, and the fourth gap has a size such that the first anti-vibration bar is displaced in the first direction and the second anti-vibration bar decreases in the second direction, Further comprising displacing the second anti-vibration bar
A method for securing a tube in a steam generator. 14. The method of claim 13,
The tube has a triangular pitch and the tube bundle 400 includes a U-shaped bend and the first plurality of vibration-preventing bars 460 and the second plurality of vibration-preventing bars 480 Is disposed within the U-shaped bend
A method for securing a tube in a steam generator. 10. The method of claim 9,
Providing a second plurality of anti-vibration bars (540); And
Providing a third row (550) of tubes, wherein each of the second plurality of vibration-preventing bars is disposed between a second row (530) of the tube and a third row of the tube, The third row includes a third tube having a curved centerline disposed in a third plane 556 that is parallel to the second plane 536 and is spaced from the second plane 536 by a distance 508 ) Of said tube, said third row of said tube (550)
Wherein each of said second plurality of anti-vibration bars has a thickness (542) that is generally transverse to said second plane and said third plane,
The thickness of each of the second plurality of anti-vibration bars is less than the thickness (522) of each of the first plurality of anti-vibration bars (520)
A method for securing a tube in a steam generator.

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