JP2012045639A - Method for joining pipe base, method for producing vapor generator, member for pipe base and vapor generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for joining a pipe base, in which a member for the pipe base can be easily positioned relative to a base material and can be joined to the base material with high precision even after the welding is performed, and to provide a method for producing a vapor generator, and further to provide the member for the pipe base and the vapor generator.SOLUTION: The member for the pipe base, which becomes the pipe base, has a fixation part to be fixed to the base material. The method for joining the pipe base has: a temporarily-fixing step of temporarily fixing the member for the pipe base to the base material by means of the fixation part; a joining step of joining at least a part of a gap between the member for the pipe base and the base material, which are fixed temporarily to each other, by welding; and a hole forming step of forming a hole extending from the welded member for the pipe base to the base material. As a result, since positioning can be easily performed without preheating, the member for the pipe base can be joined to the base material with high precision.

Description

  The present invention relates to a method for joining a nozzle to a nozzle installed on a base material of a structure, a method for manufacturing a steam generator, a member for a nozzle, and a steam generator.

  For example, a pressurized water reactor (PWR) uses light water as a reactor coolant and a neutron moderator. Light water becomes high-temperature and high-pressure water that does not boil throughout the core. The pressurized water nuclear reactor is one in which this high-temperature high-pressure water is sent to a steam generator to generate steam by heat exchange, and this steam is sent to a turbine generator for power generation. The pressurized water reactor transfers heat of the high-temperature and high-pressure primary cooling water to the secondary cooling water via the steam generator, and generates water vapor of the secondary cooling water. In the steam generator, primary cooling water flows inside a large number of thin heat transfer tubes, and heat is transferred to secondary cooling water flowing outside to generate steam. The pressurized water reactor uses the steam to turn the turbine to generate electricity.

  A steam generator arrange | positions a tube group outer cylinder in the trunk | drum which makes | forms a hollow airtight shape with the inner wall surface and predetermined spacing. A plurality of U-shaped heat transfer tubes are arranged in the tube group outer cylinder, and the end portions of the heat transfer tubes are supported on the tube plate. In addition to the heat transfer tube, the tube may be supported by a tube plate, a tube group outer tube, or a body for draining or inspection. To support the tube, a nozzle is used. The nozzle is supported by being welded to a tube plate or a trunk.

  The nozzle must be accurately positioned before it is welded to the tube plate or the trunk. Patent Documents 1 and 2 disclose conventional nozzle connection methods. In a conventional nozzle connection method, an end portion of a tube is inserted into a through hole of a tube sheet, and a circumferential weld joint is formed and joined to an inner surface of the through hole at the end portion.

JP 58-108395 A JP 2008-214746 A

  However, the circumferential welded joint must first be pre-welded and positioned after preheating the nozzle member. Preheating is necessary in order to prevent the occurrence of welding defects in the welding of low alloy steel, which is a high-strength member constituting the steam generator. Temporary welding may cause the nozzle member to be affected by deformation / inclination and displacement due to preheating thermal expansion. Therefore, it is necessary to inspect the state of deformation of the nozzle member or the state where the nozzle member is positioned at a predetermined position of the tube plate. When deformation or misalignment has occurred, re-temporary welding may be necessary. Alternatively, if the main welding is performed with a positional deviation or tilt, it may not fit within the specified dimensions after the main welding. To perform main welding on the outer periphery of the nozzle, consider the influence of the thermal distortion of the main welding. It was necessary to perform welding work.

  The present invention has been made in view of the above, and the nozzle member can be easily positioned with respect to the base material, and the nozzle member and the base material can be joined with high accuracy even after welding. An object is to provide a nozzle connection method, a steam generator manufacturing method, a nozzle member, and a steam generator.

  In order to solve the above-described problems and achieve the object, the nozzle joining method of the present invention is a nozzle joining method for joining a base material and a nozzle, and is a nozzle member that becomes the nozzle Has a fixing part that can be fixed to the base material, and temporarily fixing the nozzle member to the base material by the fixing part, the temporarily fixed member for the nozzle base and the base material A joining step of welding at least a part of the gap between the two, and an opening step of opening a passage from the nozzle member after welding to the base material.

  In the nozzle joining method of the present invention, positioning can be easily performed without preheating the nozzle nozzle member. Moreover, since there is no deformation | transformation by preheating, the member for nozzles and a base material can be joined with high precision at a joining process.

  Moreover, the nozzle joining method according to the present invention is characterized in that the fixing portion is removed in the opening step.

  Since the fixing portion is removed together with the opening, the manufacturing time can be shortened without removing the unnecessary fixing portion as a separate process. Further, along with the removal of the fixed portion, the weld toe of the welded portion inside the opened passage is removed. Accordingly, it is possible to eliminate a problem associated with the weld toe. Furthermore, by removing the weld toe, the joining between the nozzle member and the base material is completely melted and the joining reliability is improved.

  In the nozzle joining method according to the present invention, it is preferable that the fixing portion has a structure that regulates the removal of the nozzle member from the base material.

  Even if a tensile force or other force is applied to the temporarily fixed nozzle member by the bonding process and the lifting force is received, the removal of the nozzle member from the base material is restricted, so the bonding accuracy is high. it can.

  In addition, in the nozzle joining method according to the present invention, it is preferable that the fixing portion has a fastening structure that can be fastened to the base material. Preferably, the fixing portion is a male screw, and a female screw is formed on the base material. The engagement of the male screw and the female screw restricts the removal of the nozzle member from the base material so that the nozzle member does not float with respect to the base material.

  In addition, the nozzle joining method according to the present invention preferably has a concave shape in which a convex shape is formed on one of the fixing portion and the base material, and the convex shape is fitted on the other. . By fitting the projections and depressions, the nozzle member is prevented from coming off from the base material so that the nozzle member does not float with respect to the base material.

  Further, in the nozzle joining method according to the present invention, the nozzle base member has an abutting surface that can abut against the surface of the base material around the fixed portion, and is capable of contacting the base material surface. It is preferable to have a contact portion.

  The posture of the nozzle member with respect to the substrate is stabilized by the contact portion. Further, even when a force such as a tensile stress is applied to the temporarily fixed nozzle member by the joining process and a force for inclining the nozzle member is received, the force can be received at the contact portion. Since welding can be performed while maintaining the orientation of the nozzle member with respect to the base material, the joining accuracy between the base material and the nozzle member can be increased.

  In the nozzle joining method according to the present invention, it is preferable that the contact portion is removed in the opening step.

  Since the fixing portion and the abutting portion are removed together with the opening, the manufacturing time can be shortened without removing the unnecessary fixing portion and the abutting portion as separate processes. Further, along with the removal of the fixed portion and the contact portion, the weld toe of the welded portion located inside the opened passage is removed. Therefore, even if a defect associated with the weld toe exists, it can be eliminated. Furthermore, by removing the weld toe, the joining between the nozzle member and the base material is completely melted and the joining reliability is improved.

  Further, in the nozzle joining method according to the present invention, it is preferable that the nozzle member has a tapered shape in which an outer diameter decreases as the fixing member is approached. The tapered shape makes it easier for the operator to reach a gap between the nozzle member and the base material with a welding tool such as a torch. Moreover, it becomes easy for an operator to recognize the back of the clearance gap between the member for nozzles, and a base material by taper shape.

  Moreover, the nozzle joining method according to the present invention is characterized in that the nozzle member is processed with an opening tool having an outer diameter larger than the outer diameter of the fixed portion in plan view.

  When the outer diameter of the opening tool is larger than the outer diameter of the fixing portion, the fixing portion is removed by the opening tool by performing the opening process. It is preferable to make the inner diameter of the processing hole of the nozzle member larger than the outer diameter of the fixed portion. By selecting the outer diameter of the tool for opening so as to follow the inner diameter of the processing hole, the processing hole serves as a guide for the opening process. If it does so, a fixed part will be reliably removed with the tool for opening by performing an opening process.

  Further, the nozzle joining method according to the present invention is characterized in that the machining center of the opening tool and the outer diameter center of the fixing portion overlap each other in a plan view. Therefore, the fixing portion is surely removed by the opening tool.

  Moreover, it is preferable that the said base material is the trunk | drum or tube sheet of a steam generator as for the manufacturing method of the steam generator manufactured using the nozzle joining method concerning this invention. Since the present invention can realize a state of complete penetration of the nozzle joint in the facility of the nuclear power plant, reliability can be ensured.

  In order to solve the above-described problems and achieve the object, the nozzle member according to the present invention is a nozzle member for joining to a base material as a nozzle, and the nozzle member is the base material. It has the fixing | fixed part which can be fixed to.

  The member for nozzles of this invention can position the member for nozzles easily with respect to a base material, without adding preheating to the member for nozzles. Moreover, since there is no deformation | transformation by preheating, there exists an advantage which raises the joining precision of a base material and the member for nozzles.

  Further, the nozzle member according to the present invention has a processing hole into which an opening tool can be inserted, and the diameter of the processing hole is larger than the outer diameter of the fixing portion in plan view.

  When the outer diameter of the tool is larger than the outer diameter of the fixing portion, the fixing portion is removed by the opening tool by performing the opening process. It is preferable to make the inner diameter of the processing hole of the nozzle member larger than the outer diameter of the fixed portion. By selecting the outer diameter of the tool so as to follow the inner diameter of the processing hole, the processing hole serves as a guide for the opening process. If it does so, a fixed part will be reliably removed with the tool for opening by performing an opening process.

  The nozzle member according to the present invention is characterized in that the center of the inner diameter of the processing hole and the center of the outer diameter of the fixing portion overlap in a plan view. Therefore, the fixing portion is surely removed by the opening tool.

  In order to solve the above-described problems and achieve the object, the steam generator of the present invention includes a base material for the steam generator, a nozzle base welded to the surface of the base material via a weld, A passage that penetrates at least the welded portion, the welded portion is exposed to the passage, and the thickness of the welded portion in the direction of the central axis of the welded portion decreases as it approaches the passage.

  In the steam generator according to the present invention, since the welded portion is exposed to the passage by removing the weld toe, the joint between the nozzle member and the base material is completely melted, and the joint reliability is improved.

  The nozzle joining method, the steam generator manufacturing method, the nozzle nozzle member, and the steam generator according to the present invention can be easily positioned, and even after welding, the nozzle nozzle member and the base material are highly accurate. The effect that it can join to is produced.

FIG. 1 is an explanatory diagram showing a configuration of a nuclear power plant. FIG. 2 is an explanatory diagram showing the configuration of the steam generator of the nuclear power plant described in FIG. FIG. 3 is a cross-sectional view illustrating the nozzle according to the first embodiment. FIG. 4 is a cross-sectional view illustrating the nozzle member and the base material according to the first embodiment. FIG. 5 is a cross-sectional view illustrating temporary fixing between the nozzle member and the base material according to the first embodiment. FIG. 6 is an explanatory diagram illustrating a joining process and an opening process of the nozzle member and the base material according to the first embodiment. FIG. 7 is an explanatory diagram illustrating an opening process of the nozzle member and the base material according to the first embodiment. FIG. 8 is a cross-sectional view illustrating a tube according to the second embodiment. FIG. 9 is an explanatory view illustrating the nozzle member and the base material according to the second embodiment. FIG. 10 is an explanatory view illustrating the nozzle member and the base material according to the third embodiment. FIG. 11 is an explanatory view illustrating the nozzle member and the base material according to the fourth embodiment. FIG. 12 is an explanatory view illustrating a nozzle member and a base material according to a modification of the fourth embodiment. FIG. 13A is an explanatory diagram illustrating a nozzle member and a base material according to another modification of the fourth embodiment. FIG. 13-2 is a plan view of the main part of FIG. 13-1. FIG. 13C is a plan view of the main part of FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

  FIG. 1 is an explanatory diagram showing a configuration of a nuclear power plant. FIG. 2 is an explanatory diagram showing the configuration of the steam generator of the nuclear power plant described in FIG. FIG. 3 is a cross-sectional view illustrating the nozzle according to the first embodiment. 4-7 is explanatory drawing for demonstrating the joining method of the member for nozzles concerning Example 1. FIG.

[Nuclear Power Plant]
The nuclear power plant 100 includes, for example, a pressurized water light reactor nuclear power generation facility (see FIG. 1). In this nuclear power plant 100, a reactor containment vessel 110, a reactor 120, a pressurizer 130, a steam generator 140, and a pump 150 are sequentially connected by a primary coolant pipe 160, and a primary coolant circulation path (primary system circulation path). ) Is configured. Further, a secondary coolant circulation path (secondary system circulation path) is formed between the steam generator 140 and the turbine 210.

  In this nuclear power plant 100, first, the primary coolant is heated to a high temperature and a high pressure by the reactor 120, and is pressurized by the pressurizer 130 and supplied to the steam generator 140 while maintaining the pressure constant. Next, when the steam generator 140 performs heat exchange between the primary coolant and the secondary coolant, the secondary coolant evaporates to become steam. Then, the secondary coolant that has become the steam is supplied to the turbine 210, whereby the turbine 210 is driven and power is supplied to the generator 220. The primary coolant that has passed through the steam generator 140 is recovered via the primary coolant pipe 160 and supplied to the reactor 120 side. Further, the secondary cooling water that has passed through the turbine 210 is cooled by the condenser 230, and then recovered through the secondary coolant pipe 240 and supplied to the steam generator 140. The nuclear power plant 100 handles high-temperature / high-pressure fluid and fluid that may contain radioactive substances. For this reason, strict management is required at the time of production. Since these pipes are composed of a welded structure, the soundness of welding is an essential condition.

[Steam generator]
The steam generator 140 includes a body 141, a plurality of heat transfer tubes 142, a steam separator 143, and a moisture separator 144 (see FIG. 2). The body 141 has a substantially cylindrical shape and a hollow sealed structure, and is arranged with the longitudinal direction thereof directed in the vertical direction. Moreover, the trunk | drum 141 has a pair of water chamber 1413, 1414 divided by the tube plate 1411 and the partition plate 1412 in the bottom part. The water chamber 1413 (1414) is connected to the primary coolant pipe 160 via an inlet side nozzle 1415 (outlet side nozzle 1416). The heat transfer tube 142 has a substantially U shape, and is disposed in the body 141 with both ends directed vertically downward. Both ends of the heat transfer tube 142 are inserted into the tube plate 1411 and supported. Further, both end portions of the heat transfer tube 142 open to the inlet side water chamber 1413 and the outlet side water chamber 1414, respectively. Further, a tube group outer cylinder 145 having a cylindrical shape is disposed in the body portion 141, and a plurality of heat transfer tubes 142 are disposed in the tube group outer cylinder 145. A plurality of tube support plates 146 are arranged in the tube group outer tube 145 at a predetermined interval. The heat transfer tubes 142 are supported by these tube support plates 146. Further, the tube group outer cylinder 145 is disposed with a gap with respect to the inner wall of the body portion 141. The steam separator 143 is a device that separates feed water into steam and hot water. The moisture separator 144 is a device that removes moisture from the separated steam and brings it into a state close to dry steam.

  In the steam generator 140, the primary coolant flows into the inlet-side water chamber 1413 from the inlet-side nozzle 1415, enters the outlet-side water chamber 1414 through the heat transfer pipe 142, and is discharged from the outlet-side nozzle 1416 to the outside. Further, the secondary coolant is introduced from the water supply pipe 1417 into the body 141 and passes through the pipe group outer cylinder 145. At this time, heat exchange between the primary coolant and the secondary coolant is performed, and the secondary coolant is heated. Then, when the secondary coolant passes through the steam separator 143 and the moisture separator 144, the steam component of the secondary coolant is taken out and supplied to the turbine 210 side.

  In addition to the heat transfer tube, the steam generator 140 is supported by a tube plate, a tube group outer tube, and a body portion for draining and inspection. In order to support the tube, the nozzles 10 and 20 are used. The nozzle is supported by being welded to a tube plate or a trunk. In order to maintain the soundness of welding, the steam generator 140 needs to weld the nozzles 10 and 20 to the tube sheet, the tube group outer cylinder, and the body portion in a completely melted state. Here, complete penetration refers to a state of penetration in which a welded joint that joins two members is welded over the entire region of at least one joint thickness. In the facility of the nuclear power plant 100 such as the steam generator 140, it is an essential requirement that a state of complete penetration is realized in the welding of the nozzle.

[Tube head]
A nozzle 10 according to the first embodiment will be described with reference to the drawings. FIG. 3 is a cross-sectional view of the nozzle according to the first embodiment.

  First, as shown in FIG. 3, in the nozzle 10, the nozzle 11 that is a tubular joint is welded to the body 141 of the steam generator 140 that is a base material. The nozzle part 11 has a substantially cylindrical outer diameter. The nozzle part 11 is formed of, for example, low alloy steel or carbon steel. Moreover, the outer diameter of the nozzle part 11 is about φ50 mm to 150 mm and the height is about 100 mm to 150 mm. Inside, a nozzle hole 11x having a central axis in a direction perpendicular to the outer surface 141b of the body 141 is opened, and a nozzle hole wall 21 is provided. The inner diameter of the nozzle hole 11x is, for example, about φ10 mm to 50 mm. Moreover, the nozzle part 11 has the taper part 17 used as the welding surface welded with the trunk | drum 141 which is a base material, the joint end part 12 for connecting, and the joint end part 12 to the nozzle hole wall 21 It has a mortar-shaped mortar wall 22 whose diameter is gradually reduced.

  Further, the body portion 141 has a base material hole 141x that passes through the outer surface 141b and the inner surface 141c, and has a base material hole wall 141a. The nozzle part 11 is welded and joined to the body part 141 via the welding part 14 so that the central axis of the nozzle hole 11x of the nozzle part 11 is aligned with the central axis O of the base material hole 141x. And it opens from the nozzle hole 11x to the base material hole 141x, and the welding part hole 14x has penetrated. A passage is formed by the nozzle hole 11x, the weld hole 14x, and the base material hole 141x. In the passage, the welded portion is exposed to the welded portion hole inner wall 14a. The passage has the same inner diameter, and the nozzle hole wall 21, the welded hole inner wall 14a, and the base material hole wall 141a are connected to each other so that the surface is smoothly connected. The tapered portion 17 of the nozzle pedestal portion 11 is opposed to the outer surface 141b of the body portion 141 via a welded portion. Due to the tapered portion 17 of the nozzle pedestal 11, the distance between the nozzle pedestal 11 and the outer surface 141b of the trunk 141 is gradually increased. Accordingly, the thickness of the welded portion in the direction of the central axis O formed at least in the gap between the tapered portion 17 of the nozzle pedestal 11 and the outer surface 141b of the trunk portion 141 becomes smaller as it approaches the inner wall 14a of the welded portion hole. Moreover, since the nozzle 10 of Example 1 is the penetration welded with the welding part over the whole area | region of the taper part 17 of the nozzle part 11, it is in the state of complete penetration. The boundary between the nozzle 11 and the welded portion 14 is a bond portion 14b. Further, the boundary between the body portion 141 and the welded portion 14 becomes a bond portion 14c. Moreover, the outer peripheral surface 11b of the nozzle part 11 and the outer peripheral surface 14d of the welding part 14 are surface-finished. The outer peripheral surface 14d of the welded portion 14 is cut so as to have a predetermined curvature.

  The nozzle 10 has a passage having a nozzle hole 11x, a weld hole 14x, and a base material hole 141x. Since it has the channel | path which penetrates a welding part at least, the welding part 14 is exposed to the channel | path. The nozzle 10 can be connected to the outside through the nozzle 11 that is welded to the barrel 141 in a completely melted state. Moreover, the nozzle 10 is joined at an accurate position, and can be highly reliable as a joint even at high temperature and high pressure.

[Method of manufacturing nozzle]
The nozzle joining method according to the first embodiment will be described with reference to FIGS. As shown in FIG. 5, a nozzle member 111 that becomes the nozzle part 11 in FIG. 3 is prepared. The nozzle member 111 has a substantially cylindrical outer diameter. And the taper part 17 becomes a taper shape in which an outer diameter becomes small, so that the cylindrical center axis | shaft O of the nozzle member 111 is approached. A fixing portion 13 having the same central axis as the cylindrical central axis O of the nozzle member 111 is formed on the bottom portion of the nozzle member 111 on the tapered portion 17 side. In the first embodiment, the tapered portion 17 and the fixed portion 13 are connected via the bottom raising portion 16. The bottom raised portion 16 is not an essential component of the present invention, but by raising the bottom, the thickness in the direction of the central axis O of the welded portion after welding can be defined. The outer shape of the bottom raised portion 16 according to the first embodiment is substantially the same shape as the fixed portion 13. In addition, the nozzle member 111 has a taper portion 17 serving as a welding surface to be welded to the body portion 141 which is a base material, a joint end portion 12 for connecting, and a diameter from the joint end portion 12 in the inner diameter direction sequentially. It has a mortar-shaped mortar wall 22 that becomes smaller. The mortar wall 22 is connected to the processing hole 23. A center guide 24 for guiding the opening tool 41 is provided at the center of the processing hole 23. A male screw 15 is threaded on the outer periphery of the fixed portion 13.

  As shown in FIG. 4, a guide hole 31 is formed in the body portion 141 that is a base material after processing the prepared hole 32. The guide hole 31 is tapped to form a female screw that can receive the male screw of the fixing portion 13 of the nozzle member 111. The fixing portion 13 is a male screw 15, and since the female screw is formed on the base material, the fastening strength can be increased. If the guide hole 31 is formed in advance when the internal thread processing is performed on the body portion 141, the guide hole 31 can be processed continuously with other internal thread processing that is processed on the body portion 141.

  Next, the temporary fixing step will be described with reference to FIGS. 4 is fastened and temporarily fixed to the guide hole 31 shown in FIG. 4 as shown in FIG. By simply screwing the male screw 15 into the female screw of the guide hole 31, it is possible to easily position the nozzle member 111 with respect to the body 141 without applying preheating. In addition, it is possible to omit the inspection in temporary fixing.

  Next, a joining process is demonstrated using FIG. As shown in FIG. 6, at least a part of the gap between the nozzle member 111 and the body 141 that is the base material is joined by welding. Specifically, the bottom raised portion 16 defines the distance between the outer surface 141 b of the body portion 141 and the taper portion 17 in the direction of the central axis O. A welding tool such as a torch is inserted into the gap between the tapered portion 17 of the nozzle member 111 and the outer surface 141b, and overlay welding is performed. The presence of the tapered portion 17 of the nozzle member 111 ensures a space extending toward the outer periphery between the reference surface of the outer surface 141 b of the trunk portion 141 and the tapered portion 17 of the nozzle member 111. Further, since the tapered portion 17 of the nozzle member 111 is provided, the operator can easily reach the gap between the nozzle member 111 and the base material. In addition, the operator can easily recognize the depth of the gap between the nozzle member 111 and the base material. Therefore, the operator can improve the welding quality of the weld toe L. It is preferable that the overlay welding is performed so that the weld toe M is formed beyond the tapered outer peripheral end 17a of the tapered portion 17. This is because it becomes easy to finish the weld toe M in a subsequent process.

  By the way, a force such as tensile stress is applied to the nozzle member 111 temporarily fixed by the joining process, and the nozzle member 111 may receive a lifting force. The engagement between the male screw and the female screw restricts the nozzle member 111 from coming off the base so that the nozzle member 111 does not float with respect to the base. Due to the fastening structure (screw structure) fastened in the temporary fixing step, the nozzle member 111 is unlikely to be lifted from the trunk part 141, so that the nozzle member 111 and the trunk part 141 can be joined with high accuracy. Since it has a structure that regulates the removal of the nozzle member 111 from the body portion 141, an error in accuracy in the joining process (differences in the reference surfaces, misunderstandings) is minimized. The weld toe on the outer surface 141 b of the body 141 is a weld toe N.

  Next, an opening process is demonstrated using FIG.6 and FIG.7. Here, FIG. 7 is an explanatory diagram for explaining overlapping in a plan view of the nozzle member 111 of FIG. As shown in FIG. 6, after the joining process, the nozzle member 111 joined to the barrel 141 is opened from the nozzle member 111 to the barrel 141 with an opening tool 41 such as a drill. Here, the processing hole 23 of the nozzle member 111 serves as a processing guide for the opening tool 41. Processing is started from the center guide 24 that coincides with the cylindrical center axis O of the nozzle member 111. The opening process is continued until the opening tool 41 reaches at least the body 141. The opening process may be a passage that penetrates at least the welded portion 14. In the opening step, the machining by the opening tool 41 may be stopped not only in the opening through which the entire body portion 141 is penetrated. In this case, the base material hole 141x in FIG. 3 is not a through hole but a concave shape. Even in the case of the base hole 141x having a concave hole shape, for example, another side hole is formed in the body portion 141, and the other side hole is connected to the base hole 141x having a concave hole shape to form a passage. Can do. Here, as shown in FIG. 7, the center guide 24 coincides with the cylindrical central axis O, and the machining is performed along the cylindrical central axis O. Since the opening tool 41 is processed in the direction of the cylindrical center axis O, the processing center of the opening tool 41 and the center of the outer diameter of the fixed portion 13 coincide on the extension line of the cylindrical center axis O. When the diameter Q of the machining hole for guiding the opening tool 41 is made larger than the outer diameter P of the fixed portion 13 indicated by a broken line in FIG. 7, the outer diameter R of the opening tool 41 generally follows the guide. Therefore, the outer diameter R of the opening tool 41 is larger than the outer diameter P of the fixed portion 13. If it does so, the fixing | fixed part 13 will be removed with the tool 41 for opening by performing an opening process. Since the fixing part 13 is removed together with the opening process, the manufacturing time can be shortened without removing the unnecessary fixing part 13 as a separate process. In addition, along with the removal of the fixing portion 13, the weld toe L between the nozzle member 111 and the base material is removed. Therefore, even if a defect associated with the weld toe L exists, it can be eliminated. Furthermore, by removing the weld toe L, the joining between the nozzle member 111 and the base material is completely melted, and the joining reliability is improved. If the outer diameter R of the opening tool 41 is larger than the outer diameter P of the fixing portion 13, the central axis of the fixing portion 13 and the machining axis do not necessarily have to coincide with each other. As shown in FIG. 7, the center of the inner diameter of the processing hole 23 and the outer side of the fixing portion 13 so that the center axis (outer diameter center) of the fixing portion and the cylindrical center axis O that is the processing axis coincide with each other. The fixing portion 13 is surely removed by the opening tool 41 when the center of the diameter overlaps.

  In the first embodiment, as shown in FIG. 3, the opening process is performed until the opening tool 41 of FIG. 6 reaches the inner surface 141c from the outer surface 141b of the body 141. The opening process may not be performed until the opening tool 41 reaches the inner surface 141c from the outer surface 141b of the body 141, or may be stopped halfway. When the opening tool 41 exceeds the outer surface 141b of the body part 141, the weld toe L shown in FIG. 6 is removed, so that the pipe is connected to the outside through the nozzle part 11 welded and joined in a completely melted state. can do.

  Next, a finishing process is demonstrated using FIG.3 and FIG.6. In the finishing process, the weld toes M and N shown in FIG. 6 are gently smoothed by a grinder or the like. This is to improve the long-term fatigue strength of the nozzle 10. With the finishing process, as shown in FIG. 3, the outer peripheral surface 11 b of the nozzle base 11 and the outer peripheral surface 14 d of the welded portion 14 are surface-finished. The outer peripheral surface 11b of the nozzle 11 is ground and thinned, for example, by an outer diameter of 1 mm to 6 mm. Moreover, the outer peripheral surface 14d of the welding part 14 is processed so as to have a predetermined curvature. In order to smooth the inner wall of the passage, it is preferable that the nozzle hole wall 21, the welded hole inner wall 14a, and the substrate hole wall 141a are also ground. Then, it is preferable to perform a general annealing process etc. after welding.

  The present invention can join a nozzle member and a base material with high accuracy. Further, since the welded portion is exposed to the passage by removing the weld toe, the joint between the nozzle member and the base material is completely melted, and the joint reliability is improved. Reliability can be ensured because it is possible to realize the complete penetration of the nozzle joint in the nuclear plant equipment. In the nozzle 10 of the first embodiment, the base material has been described as the body 141 of the steam generator 140, but the base material is not limited. For example, the base material may be the tube plate 1411.

[Tube head]
FIG. 8 is a cross-sectional view illustrating the nozzle according to the second embodiment. FIG. 9 is a cross-sectional view for explaining the nozzle joining method according to the second embodiment. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted. In the nozzle 20 of the second embodiment, as shown in FIG. 8, the nozzle 20 is joined to a tube plate 1411 of a steam generator 140 that is a base material by a nozzle 19 that is a tubular joint. The nozzle part 19 has a substantially cylindrical outer shape, and a nozzle hole 19x having a central axis in the direction perpendicular to the outer surface 1411b of the tube sheet 1411 is opened inside. have.

  Further, the tube plate 1411 has a base material hole 1411x that passes through the outer surface 1411b and the inner surface 1411c, and has a base material hole wall 1411a. The pedestal portion 19 is welded to the tube plate 1411 via the welded portion 14 so that the central axis of the pedestal hole 19x of the pedestal portion 19 is aligned with the central axis of the base material hole 1411x. And it opens from the nozzle hole 19x to the base material hole 1411x, and the welding part hole 14x has penetrated. A passage is formed by the nozzle hole 19x, the weld hole 14x, and the base material hole 141x. In the passage, the welded portion 14 is exposed to the welded portion hole inner wall 14a. The passage has the same diameter, and the nozzle hole wall 21, the welded hole inner wall 14a, and the base material hole wall 1411a are connected to each other so that the surface is smoothly connected. Similarly to the nozzle 10 of the first embodiment, the nozzle 20 of the second embodiment is a weld that is welded to the welding material over the entire region of the tapered portion 17 of the nozzle 19, so that the complete penetration is achieved. It is in a state. The boundary between the nozzle 19 and the welded portion 14 is a bond portion 14b. Further, the boundary between the tube sheet 1411 and the welded portion 14 becomes a bond portion 14c. The outer peripheral surface 19b of the nozzle base part 19 and the outer peripheral surface 14d of the weld part 14 are surface-finished. In the nozzle 20 of the second embodiment, the outer peripheral surface 19b of the nozzle base 19 and the outer peripheral surface 14d of the welded portion 14 are cut so as to have a predetermined curvature. The nozzle 20 has a passage having a nozzle hole 19x, a weld hole 14x, and a base material hole 1411x. Since it has the channel | path which penetrates the welding part 14 at least, the welding part 14 is exposed to the channel | path. The nozzle 20 can be connected to the outside through a nozzle 19 that is welded to the tube sheet 1411 in a completely melted state. Moreover, the nozzle 20 is joined at an accurate position, and can be highly reliable as a joint even at high temperature and high pressure.

[Method of manufacturing nozzle]
The nozzle joining method according to the second embodiment will be described with reference to FIG. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted. As illustrated in FIG. 9, a nozzle member 191 that becomes the nozzle portion 19 in FIG. 8 is prepared. The nozzle member 191 has a substantially cylindrical outer shape. The nozzle base member 191 has a tapered portion 17 serving as a welding surface to be welded to the tube plate 1411 as a base material. The tapered portion 17 has a tapered shape in which the outer diameter decreases as it approaches the cylindrical central axis O of the nozzle member 191. A fixing portion 13 having the same central axis as the cylindrical central axis O of the nozzle member 191 is formed on the bottom portion of the nozzle member 191 on the tapered portion 17 side. In the second embodiment, the bottom portion of the nozzle member 191 and the fixing portion 13 are formed via the bottom raising portion 16. The bottom raised portion 16 is not an essential component of the present invention, but by raising the bottom, the thickness in the direction of the central axis O of the welded portion 14 after welding can be defined. The outer diameter S of the raised bottom portion 16 according to the second embodiment is larger than the outer diameter P of the fixed portion 13 and is substantially similar to the fixed portion 13. The bottom surface of the raised bottom portion 16 is an abutting portion 18 that forms an abutting surface that can be abutted against the outer surface 1411b of the tube plate 1411 that is located around the fixed portion 13 and is the base material surface. The abutting surface of the contact portion 18 includes a surface orthogonal to the central axis O.

  In addition, the nozzle member 191 includes a joint end portion 12 for connecting, and a mortar-shaped mortar wall 22 whose diameter gradually decreases from the joint end portion 12 in the inner diameter direction.

  Next, the temporary fixing step will be described with reference to FIG. As shown in FIG. 9, the fixing portion 13 of the nozzle base member 191 is fastened and temporarily fixed to the guide hole 31. By simply screwing the male screw 15 into the female screw of the guide hole 31, the nozzle member 191 can be easily positioned with respect to the tube plate 1411 without preheating. In addition, it is possible to omit the inspection in temporary fixing. In the nozzle member 191 of the second embodiment, the fixing portion 13 of the nozzle member 191 is fastened to the guide hole 31, and the abutting portion 18 is in contact with the outer surface 1411b of the tube plate 1411 which is the base material surface. Touched.

  Next, the joining process will be described with reference to FIG. As shown in FIG. 9, at least a part of the gap between the nozzle member 191 and the tube sheet 1411 as the base material is joined by welding.

  By the way, a force such as a tensile stress is applied to the nozzle member 191 temporarily fixed by the joining process, and the nozzle member 191 may receive a lifting force. By the engagement of the male screw and the female screw, the nozzle member 191 is prevented from coming off from the base material so that the nozzle member 191 does not float with respect to the tube plate 1411. Due to the fastening structure (screw structure) fastened in the temporary fixing step, the nozzle member 191 does not easily float from the tube plate 1411, so that the nozzle member 191 and the tube plate 1411 can be joined with high accuracy. Since it has a structure that restricts the removal of the nozzle member 191 from the tube plate 1411, the accuracy in the joining process (difference between reference planes, misunderstandings) is minimized.

  Further, in the nozzle joining method according to the second embodiment, the contact portion 18 is further in contact with the outer surface 1411b of the tube plate 1411 which is the base material surface. The contact portion 18 stabilizes the posture of the nozzle base member 191 with respect to the tube plate 1411 which is a base material. Further, even if a force such as a tensile stress is applied to the tube member 191 temporarily fixed by the joining process, and the tube member 191 receives a force for inclining with respect to the tube plate 1411, the contact portion 18. Can accept the power. Since welding can be performed while maintaining the posture of the nozzle 191 with respect to the base material, the nozzle 191 and the tube plate 1411 can be joined with high accuracy.

  Next, the opening process will be described with reference to FIG. As shown in FIG. 9, after the joining process, the nozzle member 191 joined to the tube sheet 1411 is transferred from the nozzle member 191 to the tube sheet 1411 with an opening tool 41 that is an opening tool such as a drill. Open. Here, the processing hole 23 of the nozzle member 191 serves as a processing guide for the opening tool 41. Processing is started from the center guide 24 that coincides with the cylindrical central axis O of the nozzle member 191. The opening process is continued until the opening tool 41 reaches at least the tube sheet 1411. The opening process may be a passage that penetrates at least the welded portion 14. In the opening process, not only the opening through which the tube sheet 1411 is completely penetrated, but the processing by the opening tool 41 may be stopped halfway. In this case, the base material hole 1411x in FIG. 8 is not a through hole but a concave shape. Even if the base hole 1411x has a concave hole shape, for example, another side hole is formed in the tube plate 1411, and the other side hole is connected to the base hole 1411x having the concave hole shape to form a passage. Can do. Here, as shown in FIG. 9, the center guide 24 coincides with the cylindrical central axis O, and the machining is performed along the cylindrical central axis O. In FIG. 9, when the diameter Q of the machining hole 23 for guiding the opening tool 41 is made larger than the outer diameter S of the contact portion 18 (bottom raising portion 16), the outer diameter R of the opening tool 41 follows the guide. Thus, the outer diameter R of the opening tool 41 is larger than the outer diameter S of the contact portion 18 (bottom raising portion 16). If it does so, the contact part 18 (bottom raising part 16) and the fixing | fixed part 13 will be removed with the tool 41 for opening by performing an opening process. Since the fixing part 13 and the contact part 18 are removed together with the opening process, the manufacturing time can be shortened without removing the unnecessary fixing part 13 and contact part 18 as a separate process. Further, along with the removal of the fixing portion 13 and the contact portion 18, the weld toe L between the nozzle member 191 and the base material is removed. Therefore, even if a defect associated with the weld toe L exists, it can be eliminated. Furthermore, by removing the weld toe L, the joining of the nozzle member 191 and the base material is completely melted, and the joining reliability is improved.

  In the second embodiment, as shown in FIG. 8, the opening process is performed until the opening tool 41 reaches the inner surface 1411c from the outer surface 1411b of the tube sheet 1411. The opening process may not be performed until the opening tool 41 reaches the inner surface 1411c from the outer surface 1411b of the tube sheet 1411, or may be stopped halfway. When the opening tool 41 exceeds the outer surface 1411b of the tube plate 1411, the weld toe L shown in FIG. 9 is removed, so that the pipe is connected to the outside through the nozzle base 19 welded and joined in a completely melted state. can do.

  Next, the finishing process will be described with reference to FIGS. In the finishing step, the weld toes M and N shown in FIG. 9 are gently made with a grinder or the like. This is to improve the long-term fatigue strength of the nozzle 20. In accordance with the finishing step, as shown in FIG. 8, the outer peripheral surface 19 b of the nozzle part 19 and the outer peripheral surface 14 d of the welded part 14 are surface-finished. The outer peripheral surface 19b of the nozzle 19 is ground and thinned by about 1 mm to 6 mm in outer diameter, for example. Moreover, the outer peripheral surface 19b of the nozzle part 19 and the outer peripheral surface 14d of the welding part 14 are processed so that it may have a predetermined curvature. Further, in order to smoothen the machining traces that are opened, it is preferable that the nozzle hole wall 21, the welded hole inner wall 14a, and the base material hole wall 1411a are also ground and the like. Then, it is preferable to perform a general annealing process etc. after welding.

  The present invention can join a nozzle member and a base material with high accuracy. Further, since the welded portion is exposed to the passage by removing the weld toe, the joint between the nozzle member and the base material is completely melted, and the joint reliability is improved. Reliability can be ensured because it is possible to realize the complete penetration of the nozzle joint in the nuclear plant equipment. The base 20 of the second embodiment has been described as the tube plate 1411 of the steam generator 140 as a base material. However, the base material is not limited. For example, the base material may be the body 141 as in the first embodiment.

  FIG. 10 is a cross-sectional view for explaining the nozzle joining method according to the third embodiment. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 10, a nozzle member 112 that becomes the nozzle part 11 in FIG. 3 is prepared. The nozzle member 112 has a substantially cylindrical outer shape. In the third embodiment, the bottom raising portion 16 is formed on the bottom portion of the nozzle member 112 on the tapered portion 17 side, and the guide hole 33 serving as a fixing portion is formed in the bottom raising portion 16. A female screw 36 is tapped on the inner wall surface of the guide hole 33. The guide hole 33 of the fixed portion has the same central axis as the cylindrical central axis O of the nozzle member 112. The bottom raised portion 16 is not an essential component of the present invention, but by raising the bottom, the thickness in the direction of the central axis O of the welded portion after welding can be defined. The outer shape of the bottom raised portion 16 according to the third embodiment is substantially the same shape as the guide hole 33 and has an outer diameter larger than the inner diameter of the guide hole 33. The bottom surface of the bottom raised portion 16 is an abutting portion 18 that forms a flat surface parallel to the outer surface 141b of the body portion 141 that is a base material surface and is located around the fixed portion.

  As shown in FIG. 10, the protrusion part 34 is formed in the trunk | drum 141 which is a base material. The protruding portion 34 is threaded to form a male screw 35 that can be inserted into the female screw 36 of the guide hole 33 that is a fixing portion of the nozzle member 112.

  Next, the temporary fixing process will be described. As shown in FIG. 10, the protruding portion 34 is fastened and temporarily fixed to the guide hole 33 which is a fixing portion. By simply screwing the male screw 35 into the female screw 36, the nozzle member 112 can be easily positioned without preheating.

  Thereafter, similarly to the first and second embodiments, the joining step, the opening step, and the finishing step are performed to complete the nozzle as shown in FIG. By the way, in the joining process, a force such as a tensile stress may be applied to the nozzle member 112 that is temporarily fixed to receive a lifting force. As the male screw 35 and the female screw 36 are engaged with each other, the nozzle member 112 is prevented from coming off from the barrel 141 so that the nozzle member 112 does not float from the barrel 141. In the temporary fixing step, due to the tightened fastening structure (screw structure), the nozzle member 112 does not float from the body 141, and the joining accuracy can be improved. Since it has a structure that regulates the removal of the nozzle member 112 from the body portion 141, accuracy inaccuracy in the joining process (differences between reference surfaces, misunderstandings) is minimized.

  FIG. 11 is a cross-sectional view for explaining the nozzle joining method according to the fourth embodiment. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 11, a nozzle-use member 113 which becomes the nozzle part 11 in FIG. 3 is prepared. The nozzle member 113 has a substantially cylindrical outer shape. A fixing portion 51 having the same central axis as the cylindrical central axis O of the nozzle member 113 is formed on the bottom portion of the nozzle member 113 on the tapered portion 17 side. In Example 4, the bottom raising part 16 is formed in the bottom part of the nozzle member 113, and the bottom raising part 16 and the fixing part 51 are continuously formed. The bottom raised portion 16 is not an essential component of the present invention, but by raising the bottom, the thickness in the direction of the central axis O of the welded portion after welding can be defined. The outer shape of the bottom raised portion 16 according to the fourth embodiment is substantially the same shape as the fixed portion 51 and has the same diameter.

  As shown in FIG. 11, a guide hole 52 is formed in the body 141 which is a base material. The outer diameter T of the fixing portion 51 is set in a range that is more suitable for a tight fit than the inner diameter U of the guide hole 52.

  Next, the temporary fixing process will be described. As shown in FIG. 11, the fixing portion 51 is press-fitted into the guide hole 52 and fastened to be temporarily fixed. The fixed portion 51 forms a convex shape, and a concave shape is formed in the guide hole 52 formed in the base material so that the fixed portion 51 and the guide hole 52 can be fitted together. The concave / convex fitting between the fixing portion 51 and the guide hole 52 may be reversed. The nozzle member 113 can be easily positioned with respect to the body 141 without preheating only by fitting the unevenness. Thereafter, similarly to the first and second embodiments, the joining step, the opening step, and the finishing step are performed to complete the nozzle as shown in FIG. By the way, a force such as tensile stress is applied to the nozzle member 113 temporarily fixed by the joining process, and the nozzle member 113 may receive a lifting force. Due to the uneven fitting, the nozzle member 113 is prevented from coming off from the base material so that the nozzle member 113 does not float with respect to the base material. In the temporary fixing step, the nozzle member 113 is unlikely to be lifted from the body 141 due to the fastening structure (fitting structure) fastened. That is, since it has a structure that restricts the removal of the nozzle member 113 from the body portion 141, the accuracy in the joining process (difference between reference planes, misunderstandings) is minimized. .

  FIG. 12 is an explanatory view illustrating a modification of the nozzle joining method according to the fourth embodiment. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 12, the nozzle member 114 which becomes the nozzle part 11 in FIG. 3 is prepared. The nozzle member 114 has a pin-shaped fixing portion 53 as shown in FIG. The outer surface 141b of the trunk portion 141 has a hole-shaped guide hole 54 corresponding to the fixing portion 53 as shown in FIG. As shown in FIG. 12, the fixing portion 53 is attached to the guide hole 54 and fastened by being fastened. That is, the fixing portion 53 forms a convex shape, and a concave shape is formed in the guide hole 54 formed in the base material so that the fixing portion 53 and the guide hole 54 can be fitted together. The concave / convex fitting between the fixing portion 53 and the guide hole 54 may be reversed. The nozzle member 114 can be easily positioned with respect to the body 141 without preheating only by fitting the unevenness. Thereafter, similarly to the first and second embodiments, the joining step, the opening step, and the finishing step are performed to complete the nozzle as shown in FIG. By the way, a force such as tensile stress is applied to the nozzle member 114 temporarily fixed by the joining process, and the nozzle member 114 may receive a lifting force. By fitting the unevenness, the nozzle member 114 is prevented from coming off from the base material so that the nozzle member 114 does not float with respect to the base material. In the temporary fixing step, the nozzle member 114 is unlikely to be lifted from the body portion 141 due to the tightened fastening structure (fitting structure). That is, since it has a structure that restricts the withdrawal of the nozzle member 114 from the body portion 141, the accuracy in the joining process (difference between reference planes, misunderstandings) is minimized. .

  FIG. 13A, FIG. 13B, and FIG. 13C are explanatory diagrams for explaining another modification of the nozzle joining method according to the fourth embodiment. Note that the same members as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted. As illustrated in FIG. 13A, a nozzle member 115 that serves as the nozzle unit 11 in FIG. 3 is prepared. The nozzle member 115 has a fixing portion 55 with an engaging convex portion 56 as shown in FIG. The body 141 has a guide hole 57 and has a hole shape with an engagement recess 59 as shown in FIG. FIG. 13B is a plan view of only the fixing portion 55 as seen in a plan view from the bottom of the nozzle member 115 on the tapered portion 17 side. The fixing portion 55 has an engaging convex portion 56 on a part of the outer periphery of the fixing portion 55. FIG. 13C is a plan view of the guide hole 57 as seen in a plan view from the upper surface on the body 141b side. The guide hole 57 has an insertion groove 58, and the engagement recess 59 is behind the body 141b except for the insertion groove 58. The engagement between the fixing portion 55 and the guide hole 57 will be described with reference to FIGS. 13-1, 13-2, and 13-3. The engaging convex portion 56 of the fixing portion 55 is inserted so as to pass through the insertion groove 58 of the guide hole 57. After insertion, the nozzle member 115 is rotated so that the engaging convex portion 56 and the engaging concave portion 59 are engaged with each other as shown in FIG. The engagement convex portion 56 and the engagement concave portion 59 mesh with each other, so that the nozzle member 115 is prevented from coming off from the body portion 141 and is fastened and temporarily fixed. The nozzle member 115 can be easily positioned with respect to the body 141 without preheating only by engaging the concaves and convexes. Thereafter, similarly to the first and second embodiments, the joining step, the opening step, and the finishing step are performed to complete the nozzle as shown in FIG. By the way, a force such as tensile stress is applied to the nozzle member 115 temporarily fixed by the joining process, and the nozzle member 115 may receive a lifting force. Due to the engagement of the projections and recesses, the nozzle member 115 is prevented from coming off from the base material so that the nozzle member 115 does not float with respect to the body 141. In the temporary fixing step, the nozzle member 115 is unlikely to be lifted from the body 141 due to the fastening structure (engagement structure) fastened. That is, since it has a structure that restricts the removal of the nozzle member 115 from the body 141, the accuracy in the joining process (difference between reference planes, misunderstandings) is minimized. .

  As described above, the tube can be supported on the tube plate, the tube group outer tube, and the body portion for the heat transfer tube, the drain, and the inspection by using the nozzles described in the embodiments. Although a pressurized water type light water reactor nuclear power generation facility has been described as an example, it can be applied to a boiling water type and other nuclear power plants. It can also be applied to general heat exchangers and thermal power plants. The present invention is more effective in high-temperature and high-pressure piping.

  As described above, the nozzle connection method and the nozzle member according to the present invention are useful for, for example, a heat exchanger such as a steam generator and a manufacturing method thereof, and are particularly suitable for a nuclear power plant, a thermal power plant, and the like. ing.

10, 20 Tubular head 11x, 19x Tubular hole 13, 33, 51, 53, 55 Fixing part 14a Welding part hole inner wall 14d Outer peripheral surface 14x Welding part hole 15 Male screw 17 Taper part 17a Taper outer peripheral end 18 Contact part 11, 19 Tubular portion 11b, 19b Outer peripheral surface 21 Tubular hole wall 24 Center guide 31, 52, 54, 57 Guide hole 34 Projection portion 41 Opening tool 58 Insertion groove 100 Nuclear power plant 110 Reactor containment vessel 111, 191 113, 114, 115 Tubular member 130 Pressurizer 141 Body 141a Body base hole wall 141b Body outer surface 141c Body inner surface 141x Base hole 1411 Tube plate 1411a Tube plate base wall 1411b Tube plate outer surface 1411c Tube plate inner surface 1411x Base material hole 1413, 1414 Water chamber 1415 Inlet side Sul 1416 Outlet side nozzle 142 Heat transfer tube 143 Air / water separator 145 Tube group outer cylinder 146 Tube support plate 160 Primary coolant tube 210 Turbine 220 Generator 230 Condenser L, M, N Weld toe O Cylindrical center shaft

Claims (16)

A nozzle joining method for joining a base material and a nozzle,
The nozzle member that becomes the nozzle has a fixing part that can be fixed to the base material, and the temporary fixing step of temporarily fixing the nozzle member to the base material by the fixing part;
A joining step of welding at least a part of a gap between the temporarily fixed member for the nozzle and the base material;
An opening step of opening a passage from the nozzle member after welding to the base material.   The nozzle connection method according to claim 1, wherein the fixing portion is removed in the opening step.   The nozzle connection method according to claim 1, wherein the fixing portion has a structure that regulates the removal of the nozzle member from the base material.   The nozzle connection method according to claim 1, wherein the fixing portion has a fastening structure that can be fastened to the base material.   The nozzle joining method according to claim 3 or 4, wherein the fixing portion is a male screw, and a female screw is formed on the base material.   The nozzle joining method according to claim 3 or 4, wherein a convex shape is formed on one of the fixing portion and the base material, and the convex shape is fitted on the other, and the convex shape is fitted on the other.   The said nozzle member has an abutting part which has an abutting surface which can be abutted on the said base material surface around the said fixing | fixed part, and can contact | abut with the base material surface. The nozzle joining method according to any one of the above.   The nozzle joining method according to claim 7, wherein the contact portion is removed in the opening step.   The said nozzle member is a nozzle joining method as described in any one of Claim 1 to 8 which has a taper shape in which an outer diameter becomes small as it approaches the said fixing | fixed part.   10. The nozzle connection method according to claim 1, wherein the nozzle member is processed by an opening tool having an outer diameter larger than an outer diameter of the fixed portion in a plan view. .   11. The nozzle connection method according to claim 10, wherein, in the plan view, the processing center of the opening tool and the center of the outer diameter of the fixing portion overlap each other in plan view.   The said base material is a trunk | drum or a tube sheet of a steam generator, The manufacturing method of the steam generator manufactured using the nozzle nozzle joining method as described in any one of Claim 1 to 11. It is a member for a nozzle for joining as a nozzle to a base material,
The said nozzle member has the fixing | fixed part which can be fixed to the said base material, The member for nozzles characterized by the above-mentioned.   14. The nozzle member according to claim 13, wherein the nozzle member has a processing hole into which an opening tool can be inserted, and the diameter of the processing hole is larger than the outer diameter of the fixing portion in plan view. .   15. The nozzle member according to claim 14, wherein the center of the inner diameter of the processing hole and the center of the outer diameter of the fixing portion overlap in a plan view. A steam generator substrate;
A nozzle that is welded and joined on the surface of the base material via a welded portion; and at least a passage that penetrates the welded portion;
The steam generator is characterized in that the welded portion is exposed to the passage and the thickness of the welded portion in the central axis direction of the passage becomes smaller toward the passage.

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