JP2016145785A - Reactor core internal structure assembly adjustment device and assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform height adjustment of lower part reactor core support columns.SOLUTION: The assembly adjustment device for a reactor core internal structure, which comprises a lower part reactor core plate with an outer edge attached to a ring-formed fixing member 141 secured to an inner wall of a reactor core tank 127, a lower part reactor core support plate 124 secured at a bottom end of the reactor core tank 127, and a plurality of lower part reactor core support columns 129 that are provided between the lower part reactor core plate and the lower part reactor core support plate 124 and support the lower part reactor core plate, is provided with: a swivel base 181 attached at a center of the lower part reactor core support plate 124 so as to be rotatable around a vertical axis; a beam member 182 having a base end attached to the swivel base 181 and a top end supported by the fixing member 141 via a roller 182A such that the beam member is horizontally bridged and rotationally moves with a rotation of the swivel base 181; and a measurement device 183 that measures dimensions of an upper end surface of the lower part reactor core support columns 129 provided so as to stand on the lower part reactor core support plate 124, and a bottom surface of the beam member 182.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for assembling an internal structure of a pressurized water reactor and an assembling adjustment apparatus.

  Conventionally, for example, as shown in Patent Document 1, in a pressurized water reactor (PWR: Pressurized Water Reactor), an in-reactor structure (internal structure) is arranged inside a reactor vessel forming a pressure vessel. The in-core structure has a lower core structure and an upper core structure. In the lower core structure, a lower core plate is provided in the lower part of the core tank supported from the upper opening of the reactor vessel, and a lower core support plate is provided at the lower end. The lower core plate supports a plurality of fuels (fuel assemblies). The lower core support plate supports the lower core plate and also supports an in-core instrumentation guide tube that guides insertion / extraction of a thimble tube with a neutron flux detector attached to the fuel assembly. On the other hand, in the upper core structure, the upper core plate is supported below the upper core support plate via a core support rod. The upper core structure is inserted into the lower core structure from above, the upper core support plate is positioned and fixed with respect to the upper end of the core tank, and the upper core plate is positioned and supported inside the core tank. . The upper core support plate is fixed with a plurality of control rod cluster guide tubes through which the control rods are inserted into and extracted from the fuel assembly. The upper core plate holds the upper part of the fuel assembly.

JP-A-10-111379

  By the way, the pressurized water reactor described above periodically inspects various structures in order to ensure sufficient safety and reliability, and repairs necessary parts as necessary, Or replace it. When replacing the in-core structure, the new lower core plate supports the fuel assembly and needs to be attached to the core tank in a state in which the level is kept accurately. The lower core plate is supported via a plurality of lower core support columns provided between the lower core support plate and the lower core support plate. Therefore, when the lower core plate is attached to the core tank, it is necessary to adjust the lower core support plate to be horizontal.

  Generally, when adjusting the height of the lower core support column, a rigid structure beam called a stretch is used against a fixed member called a fan-shaped plate that is fixed to the inner wall of the core tank in order to attach the outer periphery of the lower core plate. In order to level the stretch by placing a level on the upper surface of this stretch and leveling the stretch, the upper end of each lower core support column is placed on the lower surface of the stretch. The height of each lower core support column is adjusted by contact.

  However, in such adjustment of the height of the lower core support column, a level is used for the final level measurement. However, the level takes more time than necessary because it takes time to stabilize the bubbles. become. Moreover, in order to make the stretch horizontal, workability is poor because a plurality of lower core support pillars on the lower side of the stretch are adjusted together. In addition, the stretch is handled by a crane because the lower core support pillars underneath it are adjusted and then moved in response to the other lower core support pillars, and the stretch is a rigid structure. Therefore, care must be taken not to allow the stretch to collide with the inner wall of the reactor core, which takes time. In addition, since the stretch is horizontal with the upper ends of the lower core support columns in contact with each other and is away from the upper surface of the fixing member, the height between the upper ends of the lower core support columns and the upper surface of the fixing member It is difficult to align.

  The present invention solves the above-described problems, and an object thereof is to provide an assembly adjustment device and an assembly method for an in-core structure capable of easily and accurately adjusting the height of a lower core support column. .

  In order to achieve the above-described object, an assembly adjustment device for an in-core structure according to the present invention includes a lower core plate having an outer edge attached to a ring-shaped fixing member fixed to an inner wall of the core tank, and the core tank. A lower core support plate is fixed to the lower end of the lower core plate, and an assembly adjustment apparatus for an in-core structure in which a plurality of lower core support columns for supporting the lower core plate are provided between the lower core plate and the lower core support plate. A swivel mounted at the center of the lower core support plate and provided so as to be rotatable about a vertical axis, and a base end is mounted on the swivel and the distal end is supported on the fixing member via a roller to maintain the level. Measure the dimensions of the beam material that is stretched over and rotated with the rotation of the swivel base, and the upper end surface of the lower core support column that is erected on the lower core support plate and the lower surface of the beam material. And having a measuring instrument And butterflies.

  In order to achieve the above-described object, the method for assembling a reactor internal structure according to the present invention includes a lower core plate having an outer edge attached to a ring-shaped fixing member fixed to an inner wall of the core tank, In the method of assembling a reactor internal structure, a lower core support plate is fixed to a lower end, and a plurality of lower core support pillars for supporting the lower core plate are provided between the lower core plate and the lower core support plate. A swivel mounted at the center of the core support plate and provided to be rotatable around a vertical axis, and a base end is mounted on the swivel and the tip is supported on the fixed member via a roller so as to be kept horizontal. A measuring instrument that measures the dimensions of the beam material passed and rotated as the swivel rotates, and the upper end surface of the lower core support column and the lower surface of the beam material that are erected on the lower core support plate An assembly adjustment device comprising: The lower core support plate is attached to the lower end of the core tank, and the lower core support pillars are attached to the lower core support plate, and the level of the fixing member is maintained. The beam member is rotated and the dimensions of the upper end surface of the lower core support column below the beam member and the lower surface of the beam member are measured by the measuring instrument, and the upper surface of the fixing member and the beam are measured. The height of the lower core support column attached to the lower core support plate is adjusted so as to match the size of the lower surface of the material, and the lower core plate is attached to all the lower core support columns adjusted in height. It is characterized by that.

  According to the present invention, the height confirmation of the lower core support column uses a measuring instrument that measures the dimensions of the upper end surface of the lower core support column and the lower surface of the beam material, and does not use a level. It can be shortened. Moreover, since the height is confirmed and adjusted for each lower core support column, the workability is good and accurate. Moreover, since the beam material used for height confirmation is rotationally moved, the number of work steps can be reduced without using a crane. Moreover, since the tip of the beam member is placed on the upper surface of the fixing member via a roller, the upper end surface of the lower core support column and the lower surface of the beam member are based on the dimensions of the upper surface of the fixing member and the lower surface of the beam member. By matching these dimensions, the heights of the upper ends of the lower core support columns and the upper surfaces of the fixing members can be easily aligned, and workability can be improved. Therefore, according to the present invention, the height of the lower core support pillar can be adjusted easily and accurately.

FIG. 1 is a longitudinal sectional view of a pressurized water reactor. FIG. 2 is a process diagram of the method for assembling the in-furnace structure according to the embodiment of the present invention. FIG. 3 is a process diagram of the method for assembling the in-furnace structure according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  Although not shown, the nuclear power plant has a nuclear reactor and a steam generator arranged in a reactor containment vessel, and a steam turbine power generation facility. The nuclear reactor of the present embodiment uses light water as a reactor coolant and a neutron moderator, and produces high-temperature and high-pressure water that does not boil over the entire core, and sends this high-temperature and high-pressure water to a steam generator to generate steam by heat exchange. This is a pressurized water reactor (PWR) that generates electricity by sending this steam to a turbine generator.

  The nuclear reactor heats the primary cooling water by fuel fission, and the steam generator exchanges heat between the high-temperature and high-pressure primary cooling water and the secondary cooling water to generate high-pressure steam. The steam turbine power generation facility generates power by driving the steam turbine with the steam. On the other hand, the steam that has driven the steam turbine is cooled by a condenser to become condensate, and is returned to the steam generator.

  FIG. 1 is a longitudinal sectional view of a pressurized water reactor. In the pressurized water reactor of the nuclear power plant described above, as shown in FIG. 1, the reactor vessel 101 is a pressure vessel, and the reactor internal structure including the fuel assembly 120 can be accommodated therein. A reactor vessel lid 101b is fixed to the reactor vessel main body 101a by a plurality of stud bolts 121 and nuts 122. The reactor vessel main body 101a has a cylindrical shape in which an upper portion can be opened by removing the reactor vessel lid 101b and a lower portion is closed by a lower mirror 101e having a hemispherical shape.

  For the reactor internal structure, an upper core support plate 123 is disposed above the inlet side nozzle 101c and the outlet side nozzle 101d of the reactor vessel main body 101a, and a lower core support plate 124 is disposed near the lower mirror 101e below. Is done. The upper core support plate 123 and the lower core support plate 124 are disk-shaped and have many communication holes (not shown). The upper core support plate 123 is connected to the upper core plate 126 downward via a plurality of core support rods 125. The upper core plate 126 has a large number of communication holes (not shown). The upper core support plate 123 and a structure in which the upper core plate 126 is connected to the upper core support plate 123 via the core support rod 125 are referred to as an upper core structure.

  Further, for the reactor internal structure, a cylindrical reactor core 127 is disposed inside the reactor vessel main body 101a with a predetermined gap from the inner wall surface. The lower core support plate 124 is fixed to the lower end of the core tank 127. Further, the core tank 127 is provided with a lower core plate 128 below the inside thereof. The lower core plate 128 is disk-shaped and has a large number of communication holes (not shown), and is supported by the lower core support plate 124 via a plurality of lower core support columns 129. The core core 127, the lower core plate 128 provided for the core tank 127, and the lower core support plate 124 are referred to as a lower core structure. In the core tank 127 of the lower core structure, the upper core structure is inserted from above, and the upper core plate 126 is connected to the upper end. The lower core support plate 124 of the lower core structure is fixed to the reactor vessel main body 101a. That is, the lower core structure and the upper core structure are supported by the reactor vessel main body 101a via the lower core support plate 124.

  Further, a core 130 is formed by the upper core plate 126, the core tank 127, and the lower core plate 128 of the internal structure. In the core 130, a large number of fuel assemblies 120 are disposed inside the core tank 127 and loaded on the lower core plate 128. The core 130 has a large number of control rods 135 disposed therein. A large number of control rods 135 are combined at the upper end portion to form a control rod cluster 136 that can be inserted into the fuel assembly 120. The upper core support plate 123 is fixed with a large number of control rod cluster guide tubes 137 passing therethrough.

  The reactor vessel lid 101 b constituting the reactor vessel 101 is provided with a magnetic jack control rod drive device 138. The control rod driving device 138 is housed in a housing 139 that is integral with the reactor vessel lid 101b. The control rod cluster drive shaft 140 extending downward from the control rod drive device 138 extends through the control rod cluster guide tube 137 to the fuel assembly 120 so that the control rod cluster 136 can be gripped. It is done.

  Further, in the reactor vessel 101, the upper plenum 142 communicating with the outlet side nozzle 101 d is formed in the reactor core 127 and in the upper region of the upper core plate 126 with respect to the core 130 with the above-described configuration. On the other hand, a lower plenum 143 is formed outside the core tank 127 and below the lower core support plate 124. A downcomer portion 144 that communicates with the inlet side nozzle 101 c and the lower plenum 143 is formed between the inner wall of the reactor vessel 101 and the core tank 127.

  The reactor vessel main body 101a is provided with a number of instrumentation nozzles 145 that penetrate the lower mirror 101e. In each instrumentation nozzle 145, an in-core instrumentation guide tube 146 is connected to the upper end portion inside the furnace, and a conduit tube 147 is connected to the lower end portion outside the furnace. Each in-core instrumentation guide tube 146 has an upper end connected to the lower core support plate 124. Then, a thimble tube 148 equipped with a neutron flux detector (not shown) capable of measuring a neutron flux passes from the conduit tube 147 through the instrumentation nozzle 145 and the in-core instrumentation guide tube 146, and passes through the lower core plate 128. And the fuel assembly 120 can be inserted. Each in-core instrumentation guide tube 146 is provided with upper and lower connecting plates 150 and 151 for suppressing vibration. The connecting plates 150 and 151 are connected to the lower core support plate 124 through support columns 152. In addition, the connecting plates 150 and 151 are supported by a shock absorber 153. The shock absorber 153 is disposed between the bottom plate 154 fixed to the bottom of the lower mirror 101e and the lower connecting plate 151.

  2 and 3 are process diagrams of the method for assembling the in-furnace structure according to the embodiment of the present invention.

  In the above-described reactor internal structure, as shown in FIG. 2, the lower reactor core structure is provided with a lower core support plate 124 attached to the lower end of a cylindrical core tank 127, and a number of lower core support plates 124 are attached to the lower core support plate 124. A core support column 129 is installed upright. In addition, a ring-shaped fixing member (also referred to as a fan-shaped plate) 141 is fixed to the inner wall of the core tank 127, and the outer edge of the lower core plate 128 is attached to the fixing member 141 with bolts (not shown). Further, the lower core plate 128 is attached to the upper end surface of each lower core support column 129 by bolts (not shown).

  The lower core plate 128 supports the fuel assembly 120 and needs to be attached to the core tank 127 in a state where the levelness is kept accurately. For this reason, if the height of each lower core support column 129 is not uniform, the level of the lower core plate 128 is impaired. Therefore, when the lower core plate 128 is attached to the core tank 127, it is necessary to adjust the height of each lower core support column 129. Here, the lower core support column 129 is attached by being screwed into a female screw hole 124a penetrating vertically in the lower core support plate 124 (vertical direction when the lower core support plate 124 is horizontally disposed). The column main body 129a protrudes from the hole 124a. The lower core support column 129 is formed on the lower side of the column main body 129a, and a male screw portion 129b is formed at a lower end portion screwed into the female screw hole 124a. Further, the lower core support column 129 has a nut 129c screwed into the male screw portion 129b from the lower surface side of the lower core support plate 124, and the nut 129c is fastened to a stepped portion at the lower end of the female screw hole 124a. It is fixed to the support plate 124. Further, the lower core support column 129 changes the protruding height of the column main body 129a by loosening the nut 129c and changing the position of the male screw portion 129b screwed into the female screw hole 124a. In this way, the height of the lower core support column 129 can be adjusted.

  In the present embodiment, the assembly adjusting device 180 shown in FIG. 3 is used to adjust the height of the lower core support column 129. The assembly adjustment apparatus 180 includes a swivel 181, a beam member (also referred to as a stretch) 182, and a measuring instrument 183.

  The swivel base 181 of the assembly adjustment apparatus 180 includes a bulkhead 181A, a bearing receiver 181B, and a bearing 181C.

  The bulkhead 181 </ b> A is attached to the upper surface at the center of the lower core support plate 124. The bulkhead 181A has a rod-shaped fixed trunk 181Aa extending from the lower end thereof. The holding member 181Ab is attached to the extending end of the fixed trunk 181Aa. The bulkhead 181A is placed on the upper surface at the center of the lower core support plate 124, and the fixed trunk 181Aa protrudes from the lower surface of the lower core support plate 124 through a manhole 124b formed at the center of the lower core support plate 124. The holding member 181Ab is attached to the protruding portion, and the lower core support plate 124 is sandwiched between the bulkhead 181A and the holding member 181Ab.

  The bearing receiver 181B is placed on the upper surface of the bulkhead 181A and supports the bearing 181C. The bearing receiver 181B is integrally provided with a flange 181Ba on the lower surface thereof. The flange 181Ba has a nut fixed thereto, and is provided with a bolt penetrating from above so as to be screwed into the nut. Nuts and bolts are provided in a large number (at least three) in the circumferential direction of the flange 181Ba, and the ends of the bolts come into contact with the upper surface of the bulkhead 181A to become the legs 181Bb of the bearing receiver 181B. And the length of leg 181Bb changes by rotating a volt | bolt with respect to a nut, and the up-and-down position of the bearing receiver 181B with respect to the upper surface of the bulkhead 181A can be adjusted.

  The bearing 181C is mounted on the upper surface of the bearing receiver 181B and rotates around the vertical axis S. As for bearing 181C, the rotation support part 181Ca is provided in the rotor. The turning support portion 181Ca supports the beam member 182.

  The beam member 182 of the assembly adjusting device 180 is a long member having a rigid structure made of, for example, H steel. The base end of the beam member 182 is supported by the turning support portion 181Ca of the bearing 181C in the turntable 181. That is, the beam member 182 rotates around the vertical axis S via the bearing 181C while being supported by the swivel base 181. Further, the beam member 182 is provided with a roller 182A at the tip thereof. The roller 182A is supported by a roller support portion 182Aa fixed to the tip of the beam member 182. The roller 182A is provided so as to contact the upper surface of the fixing member 141 to which the outer edge of the lower core plate 128 is attached. That is, the beam member 182 rotates and moves while the roller 182A rotates along the upper surface of the fixing member 141 by causing the vertical axis S of the bearing 181C to coincide with the ring-shaped center of the fixing member 141. The beam member 182 can be arranged horizontally by adjusting the length of the leg 181Bb of the bearing receiver 181B in the swivel 181 in a state where the roller 182A is in contact with the upper surface of the fixing member 141. The level of the beam member 182 can be confirmed with a level 184 placed on the upper surface of the beam member 182.

  The measuring instrument 183 of the assembly adjustment apparatus 180 measures the dimensions of the upper end surface of the lower core support column 129 and the lower surface of the beam member 182. The measuring instrument 183 of the present embodiment is a dial gauge, and measures the above dimensions by contacting a dial gauge probe installed on the upper end surface of the lower core support column 129 with the lower surface of the beam member 182. Although not shown in the drawing, the measuring instrument 183 may use an optical sensor that irradiates a laser or infrared light between the upper end surface of the lower core support column 129 and the lower surface of the beam member 182. .

A method for assembling the in-furnace structure using the assembly adjusting device 180 will be described.
(1) The axial force data of the lower core support column 129 is collected when the bolt torque is tightened on the lower core support column 129 later.
(2) The plate thickness of the lower core plate 128 at the mounting position of the lower core support column 129 and the plate thickness of the fixing member 141 are measured.
(3) At the position where the lower core support column 129 is attached to the lower core plate 128, the value with the thickest plate thickness is set to “0” to perform subtraction calculation. Note that the offset amount of the measuring instrument 183 when adjusting the height of the lower core support column 129 is taken into account for ± minutes. That is, the height of the lower core support column 129 is calculated in consideration of the plate thickness so that the upper surface level of the lower core plate 128 is horizontal from the measured value of (2). Here, the plate thickness at the connection portion of the fixing member 141 is also taken into consideration. The reason why the subtraction calculation is performed by setting the thickest value as “0” is because the lower core support column 129 has the lowest height.
(4) Screw the lower core support column 129 into the lower core support plate 124.
(5) The level of the core tank 127 is adjusted to ensure the level of the fixing member 141.
(6) The bulkhead 181A, the bearing receiver 181B, and the bearing 181C are installed on the lower core support plate 124.
(7) Level the upper surface of the bearing 181C and align the rotation center of the bearing 181C with the vertical axis S.
(8) The turning support portion 181Ca of the bearing 181C is attached to the beam member 182, the beam member 182 is installed on the bearing 181C, and the roller 182A is placed on the upper surface of the fixed member 141.
(9) The beam material 182 is leveled by the legs 181Bb while checking with a level. Then, the beam member 182 is rotated to adjust the entire circumference.
(10) A shim is inserted between the bearing receiver 181B and the bearing 181C, and the center height is set to be small (in units of 0.1 mm). The lower core plate 128 and the lower core support column 129 are attached to the lower core support plate 124, and when all the fuel assemblies 120 are loaded, the lower core support plate 124 bends due to the load (for example, 0.1 mm). Considering this, the center height is set higher by the amount of deflection. Further, if the center height is set high, the fuel assembly 120 is inclined outward when being loaded, so that contact during insertion or removal can be avoided. For example, when the fuel assembly 120 is tilted inward, there is no gap when the central fuel assembly 120 is inserted, and insertion and removal are impossible.
(11) In the measuring instrument 183, the height H from the upper surface of the fixing member 141 to the lower surface of the beam member 182 is used as a reference. When the measuring instrument 183 is a dial gauge, the scale is set to “0” at the height H.
(12) Rotate and move the beam member 182 on an arbitrary lower core support column 129, and support the lower core so that the height H (which takes into account the thickness of the lower core plate 128) by the measuring instrument 183 is reached. The height of the column 129 is adjusted.
(13) Torque the nut 129c of the lower core support column 129.
(14) Record the sinking amount of the lower core support column 129, loosen the nut 129c, add the sinking amount, adjust the height, and tighten the nut 129c again with torque.
(15) When the adjustment of all the lower core support pillars 129 is finished, the assembly adjustment device 180 is removed, the lower core board 128 is suspended in the core tank 127, and the lower core board 128 is fixed to the fixing member 141 and the lower core support pillar 129. Torque the bolt against
(16) The upper surface level of the lower core plate 128 is measured (level). If there is a fine adjustment location in the recording, the nut 129c is loosened and the screwing amount of the lower core support column 129 is finely adjusted. After the adjustment, the nut 129c is torque-tightened again. Then, the upper surface level of the lower core plate 128 is again measured and confirmed.

  As described above, in the assembly adjustment apparatus for a reactor internal structure according to this embodiment, the outer core of the lower core plate 128 is attached to the ring-shaped fixing member 141 fixed to the inner wall of the core tank 127 and the core In an assembly adjustment apparatus for an in-core structure, a lower core support plate 124 is fixed to a lower end, and a plurality of lower core support columns 129 for supporting the lower core plate 128 are provided between the lower core plate 128 and the lower core support plate 124. A swivel base 181 that is attached to the center of the lower core support plate 124 and is provided so as to be rotatable about a vertical axis; a base end is attached to the swivel base 181; and a distal end is supported by the fixed member 141 via a roller 182A. A beam member 182 that is stretched while keeping the level and rotates as the swivel base 181 rotates, and an upper end surface of the lower core support column 129 erected on the lower core support plate 124. Comprising a measuring device 183 for measuring the dimensions of the lower surface of the beam member 182, a.

  Further, in the method of assembling the reactor internal structure according to the present embodiment, the lower core plate 128 is attached to the ring-shaped fixing member 141 fixed to the inner wall of the core tank 127 and the lower edge of the core tank 127 is attached to the lower end. In a method of assembling a reactor internal structure in which a core support plate 124 is fixed and a plurality of lower core support columns 129 for supporting the lower core plate 128 are provided between the lower core plate 128 and the lower core support plate 124, the lower core support is provided. A swivel base 181 that is attached to the center of the plate 124 and is provided so as to be rotatable about a vertical axis, and a base end is attached to the swivel base 181 and a distal end is supported by the fixing member 141 via a roller 182A to maintain the level. The beam member 182 that is stretched and rotated along with the rotation of the swivel 181, the upper end surface of the lower core support column 129 erected on the lower core support plate 124, and the beam member 182 An assembly adjustment device 180 including a measuring instrument 183 that measures the dimensions of the surface, and a lower core support plate 124 is attached to the lower end of the reactor core 127, and each lower core support column 129 is attached to the lower core support plate 124. In this state, the beam member 182 is rotated and moved via the swivel 181 while maintaining the level of the fixing member 141, and the upper end surface of the lower core support column 129 below the beam member 182 and the lower surface of the beam member 182 Is measured by the measuring instrument 183, and the mounting height of the lower core support column 129 to the lower core support plate 124 is adjusted so as to match the dimensions of the upper surface of the fixing member 141 and the lower surface of the beam member 182, The lower core plate 128 is attached to all the lower core support columns 129 whose heights are adjusted.

  According to the assembly adjustment apparatus and method for assembling the reactor internal structure, the height confirmation of the lower core support column 129 is performed by measuring the instrument 183 that measures the dimensions of the upper end surface of the lower core support column 129 and the lower surface of the beam member 182. Since the level is not used, the confirmation work time can be shortened. Moreover, since the height is confirmed and adjusted for each lower core support column 129, the workability is good and accurate. And since the beam material 182 used for height confirmation is rotationally moved, an operation man-hour can be reduced without using a crane. In addition, since the tip of the beam member 182 is placed on the upper surface of the fixing member 141 via the roller 182A, the upper surface of the lower core support column 129 is determined based on the dimensions of the upper surface of the fixing member 141 and the lower surface of the beam member 182. By matching the dimensions of the end surface and the lower surface of the beam member 182, the heights of the upper ends of the lower core support columns 129 and the upper surface of the fixing member 141 can be easily aligned, and workability can be improved. Therefore, according to the assembly adjustment apparatus and the assembly method for the reactor internal structure, the height adjustment of the lower core support pillar 129 can be easily and accurately performed.

124 Lower core support plate 124a Female screw hole 127 Core tank 128 Lower core plate 129 Lower core support column 129a Post body 129b Male screw portion 129c Nut 141 Fixing member 180 Assembly adjusting device 181 Swivel stand 181A Bulk stand 181Aa Fixed stem member 181A Bearing receiver 181Ba Flange 181Bb Leg 181C Bearing 181Ca Rotating support portion 182 Beam material 182A Roller 182Aa Roller support portion 183 Measuring instrument S Vertical axis

Claims (2)

A lower core plate has an outer edge attached to a ring-shaped fixing member fixed to an inner wall of the core tank, and a lower core support plate is fixed to a lower end of the core tank, and the lower core plate, the lower core support plate, In the assembly adjustment apparatus for a reactor internal structure in which a plurality of lower core support pillars for supporting the lower core plate are provided between,
A swivel mounted at the center of the lower core support plate and provided rotatably about a vertical axis;
A beam member that is attached to the swivel base and has a distal end supported by the fixing member via a roller and stretched around the swivel base in a horizontal manner while being rotated horizontally;
A measuring instrument that measures the dimensions of the upper end surface of the lower core support column and the lower surface of the beam material that are erected on the lower core support plate;
An assembly adjustment apparatus for an in-furnace structure, comprising: A lower core plate has an outer edge attached to a ring-shaped fixing member fixed to an inner wall of the core tank, and a lower core support plate is fixed to a lower end of the core tank, and the lower core plate, the lower core support plate, In the method of assembling the in-core structure in which a plurality of lower core support columns for supporting the lower core plate are provided between
A swivel mounted at the center of the lower core support plate and provided rotatably about a vertical axis;
A beam member that is attached to the swivel base and has a distal end supported by the fixing member via a roller and stretched around the swivel base in a horizontal manner while being rotated horizontally;
A measuring instrument that measures the dimensions of the upper end surface of the lower core support column and the lower surface of the beam material that are erected on the lower core support plate;
Using an assembly adjustment device comprising
The lower core support plate is attached to the lower end of the core tank, and each lower core support column is attached to the lower core support plate, and the level of the fixing member is maintained, and the fixing member is maintained through the swivel. Rotating and moving the beam material, the dimensions of the upper end surface of the lower core support column below the beam material and the lower surface of the beam material are measured by the measuring instrument, and the upper surface of the fixing member and the beam material Adjusting the mounting height of the lower core support column to the lower core support plate so as to match the size of the lower surface, and mounting the lower core plate to all the lower core support columns adjusted in height A method for assembling a furnace internal structure.

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