CN113793708A - In-position adjusting device and in-position adjusting method for lower reactor internals of nuclear power station - Google Patents
In-position adjusting device and in-position adjusting method for lower reactor internals of nuclear power station Download PDFInfo
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- CN113793708A CN113793708A CN202110657160.3A CN202110657160A CN113793708A CN 113793708 A CN113793708 A CN 113793708A CN 202110657160 A CN202110657160 A CN 202110657160A CN 113793708 A CN113793708 A CN 113793708A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/19—Reactor parts specifically adapted to facilitate handling, e.g. to facilitate charging or discharging of fuel elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a device and a method for adjusting the in-position of a nuclear power station lower reactor component, relating to the technical field of nuclear power station construction, comprising a pressure vessel, a pressure vessel flange, a hanging basket flange and a plurality of adjusting tools, wherein the upper surface of the hanging basket flange is distributed at the phase positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees clockwise; the adjusting tool comprises a fixing mechanism and an adjusting mechanism, the fixing mechanism is arranged on the hanging basket flange, the adjusting mechanism is arranged on the pressure container flange, the adjusting mechanism comprises a polytetrafluoroethylene rod and adjusting jackscrews arranged on two sides of the polytetrafluoroethylene rod, the adjusting jackscrews are used for adjusting the position of the polytetrafluoroethylene rod, a connecting mechanism is arranged at the upper end of the polytetrafluoroethylene rod, and the polytetrafluoroethylene rod is rotatably connected with the fixing mechanism through the connecting mechanism. This application has realized that lower part is piled interior member adjustment and has standardized the operation, has practiced thrift instrument manufacturing cost, has improved the installation effectiveness, has reduced equipment damage risk.
Description
Technical Field
The invention relates to the technical field of nuclear power station construction, in particular to a positioning adjusting device and a positioning adjusting method for a lower reactor component of a nuclear power station.
Background
The position adjusting process of the lower reactor internals suspended in the pressure vessel at present mainly has two modes:
(1) the lower reactor internals are adjusted by manpower in a critical hoisting state (namely, about 95-99% of the weight of the annular hoisting equipment), by using a crow bar and other traditional tools, the method cannot realize accurate adjustment, and the problems of excessive adjustment, repeated adjustment and the like easily occur.
(2) Under the critical hoisting state (namely, about 95-99% of the weight of the annular hoisting equipment) of the lower reactor internals, a reactor internals manufacturer provides a special tool for adjustment, the special tool can only be matched with the reactor internals corresponding to the nuclear reactor types for use, different reactor types cannot be used universally, and only part of the reactor internals of the nuclear reactor types are matched with the special tool currently. The special tool has a complex structure and high manufacturing precision, and cannot be designed and imitated with reference on site.
Disclosure of Invention
The invention aims to provide a device and a method for adjusting the in-position of a lower reactor internals of a nuclear power station, which are used for solving the technical problem.
The technical scheme adopted by the invention is as follows:
a positioning adjusting device for a nuclear power station lower reactor internals comprises a pressure vessel, a pressure vessel flange arranged on the upper surface of the pressure vessel, a hanging basket flange arranged on the upper surface of the pressure vessel flange and a plurality of adjusting tools fixed on the hanging basket flange, wherein the number of the adjusting tools is four, and the adjusting tools are distributed on the upper surface of the hanging basket flange in a clockwise phase manner of 0 degrees, 90 degrees, 180 degrees and 270 degrees;
each the adjustment instrument all includes fixed establishment and guiding mechanism, fixed establishment sets up on the hanging flower basket flange, guiding mechanism sets up on the pressure vessel flange, wherein, guiding mechanism includes polytetrafluoroethylene stick and locates the adjustment jackscrew of polytetrafluoroethylene stick both sides, the adjustment jackscrew is used for the adjustment the position of polytetrafluoroethylene stick, the upper end of polytetrafluoroethylene stick is equipped with coupling mechanism, the polytetrafluoroethylene stick passes through coupling mechanism with fixed establishment rotates the connection.
Preferably, the hanging flower basket flange is annular, the upper surface of hanging flower basket flange is the hanging flower basket holding surface, even a plurality of king bolt holes have been seted up on the hanging flower basket holding surface, and adjacent two contained angle between the king bolt hole is 60, fixing mechanism locates adjacent two the king bolt is downthehole.
Preferably, the fixing mechanism comprises an equilateral angle steel with an included angle of 60 degrees and reducing bolts arranged at two free ends of the equilateral angle steel, the reducing bolts are positioned in two adjacent main bolt holes, and the included angle part of the equilateral angle steel is connected with the connecting mechanism.
As a further preference, the connecting mechanism comprises a first hexagon bolt and a long screw, the first hexagon bolt is in threaded connection with the long screw, the long screw penetrates through the included angle part and is connected with the upper end of the polytetrafluoroethylene rod, and the first hexagon bolt is used for fixing the included angle part on the long screw.
As a further preferred option, the connecting mechanism further comprises a flat washer and a compression nut, the compression nut and the flat washer are further arranged on the long screw, the compression nut is located on the lower side of the included angle portion, and the flat washer is located between the compression nut and the polytetrafluoroethylene rod.
Preferably, a groove is formed between the inner peripheral wall of the hanging basket flange and the upper surface of the pressure container flange, a centering pin hole is formed in the bottom wall of the groove, the polytetrafluoroethylene rod is arranged in the centering pin hole, and a gap of at least 5mm is formed between the outer peripheral wall of the polytetrafluoroethylene rod and the inner peripheral wall of the centering pin hole.
Preferably, the adjusting mechanism further comprises a second hexagon bolt and an angle steel, one end of the adjusting jackscrew penetrates through the angle steel and is rotatably connected with the polytetrafluoroethylene rod, and the second hexagon bolt is arranged on the angle steel and used for fixing the angle steel on the bottom wall of the groove.
As a further preferred option, the polytetrafluoroethylene rod is provided with a backing plate and a self-tapping screw, the backing plate is fixed on the polytetrafluoroethylene rod by the self-tapping screw, and one end of the adjusting jackscrew is rotatably connected with the backing plate.
Preferably, the pressure vessel further comprises a dial indicator, the bottom wall of the groove is provided with the dial indicator, and a measuring rod of the dial indicator abuts against a lower in-pile component located in the pressure vessel.
A method for adjusting the position of a lower reactor internals of a nuclear power plant, comprising:
s1, hoisting the lower reactor internals into the pressure vessel by the annular hoisting equipment, and hoisting 95-99% of the weight of the lower reactor internals by the annular hoisting equipment to enable the lower reactor internals to reach a hoisting critical state;
s2, determining the adjusting mode and the adjusting amount of the adjusting tool according to the first inspection result after the lower in-pile component is hung into the pressure container;
the adjusting mode comprises a horizontal adjusting mode and a circumferential adjusting mode;
the horizontal adjustment mode is as follows: loosening the adjusting jackscrews in the adjusting tools at 90-degree and 270-degree positions, loosening the adjusting jackscrews close to the 90-degree side in the adjusting tools at 0-degree and 180-degree positions, and tightening and adjusting the adjusting jackscrews close to the 270-degree side in the adjusting tools at 0-degree and 180-degree positions, so that the lower in-pile component can be translated in the 90-degree direction, and corresponding adjusting jackscrews are loosened and tightened in the same way in the translation to other angles;
the circumferential adjusting mode is as follows: loosening the adjusting top threads on one side of 0 degrees, 90 degrees, 180 degrees and 270 degrees, and then screwing and adjusting the adjusting top threads on the other side of 0 degrees, 90 degrees, 180 degrees and 270 degrees to realize the rotation of the lower reactor internals.
The technical scheme has the following advantages or beneficial effects:
according to the invention, the lower in-pile member in-place adjustment carried out by the adjusting tool can try to realize the quick and accurate adjustment of the lower in-pile member after the first stacking, so that the problem that the traditional adjusting process is extensive and has no seal is effectively solved, the adjustment standard operation of the lower in-pile member is realized, the manufacturing cost of the tool is saved, the installation efficiency is improved, and the equipment damage risk is reduced.
Drawings
FIG. 1 is a schematic structural view of a lower internals in-situ adjustment device of a nuclear power plant according to the present invention;
FIG. 2 is a schematic view showing the installation of the lower internals positioning adjusting device of the nuclear power plant according to the present invention.
In the figure: 1. a pressure vessel; 2. a basket flange; 3. a pressure vessel flange; 4. adjusting the tool; 41. a fixing mechanism; 411. angle steel with equal edges; 412. a variable diameter bolt; 42. an adjustment mechanism; 421. a polytetrafluoroethylene rod; 422. adjusting a jackscrew; 423. a second hexagon bolt; 424. angle steel; 425. a base plate; 426. self-tapping screws; 43. a first hexagon bolt; 44. a long screw; 45. a flat washer; 46. a compression nut; 5. a main bolt hole; 6. and (4) a groove.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
FIG. 1 is a schematic structural view of a lower internals in-situ adjustment device of a nuclear power plant according to the present invention; fig. 2 is a schematic installation diagram of the device for adjusting the in-position of the lower internals of the nuclear power plant according to the present invention, and as shown in fig. 1-2, a preferred embodiment is shown, which includes a pressure vessel 1, a pressure vessel flange 3 disposed on the upper surface of the pressure vessel 1, a basket flange 2 disposed on the upper surface of the pressure vessel flange 3, and a plurality of adjusting tools 4 fixed on the basket flange 2, wherein four adjusting tools 4 are provided, and are distributed on the upper surface of the basket flange 2 at phases of 0 °, 90 °, 180 °, and 270 ° clockwise;
each adjusting tool 4 all includes fixed establishment 41 and guiding mechanism 42, fixed establishment 41 sets up on hanging flower basket flange 2, guiding mechanism 42 sets up on pressure vessel flange 3, wherein, guiding mechanism 42 includes polytetrafluoroethylene stick 421 and locates the adjustment jackscrew 422 of polytetrafluoroethylene stick 421 both sides, adjustment jackscrew 422 is used for adjusting the position of polytetrafluoroethylene stick 421, the upper end of polytetrafluoroethylene stick 421 is equipped with coupling mechanism, polytetrafluoroethylene stick 421 passes through coupling mechanism and is connected with fixed establishment 41 rotation. In this embodiment, the pressure vessel flange 3 and the pressure vessel 1 are welded or fixed by bolts, and the basket flange 2 and the pressure vessel flange 3 are fixed by bolts. The adjusting tools 4 are distributed on the upper surface of the hanging basket flange 2 in the phase positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees, and can realize fine adjustment of four directions of the lower reactor component and counterclockwise and clockwise rotation. The adjustment tool 4 in this embodiment is detachably connected to the pressure vessel flange 3 and the basket flange 2. In this embodiment, the adjusting jackscrew 422 is rotated, so that the adjusting jackscrew 422 pushes the ptfe rod 421 to drive the lower internals to move or rotate. In the embodiment, the lower part in-pile member in-place adjustment performed by the adjusting tool 4 can be used for trying to realize the quick and accurate adjustment of the lower part in-pile member after the first time of stacking, so that the problem that the traditional adjusting process is extensive and has no seal is effectively solved, the adjustment standard operation of the lower part in-pile member is realized, the manufacturing cost of the tool is saved, the installation efficiency is improved, and the equipment damage risk is reduced.
Further, as a preferred embodiment, the basket flange 2 is annular, the upper surface of the basket flange 2 is a basket supporting surface, a plurality of main bolt holes are uniformly formed in the basket supporting surface, an included angle between two adjacent main bolt holes is 6, the main bolt hole is 0 °, and the fixing mechanism 41 is arranged in the two adjacent main bolt holes. In this embodiment, the included angle between the main bolt holes can be set as required, and the fixing mechanism 41 is connected with the main bolt holes through threads.
Further, as a preferred embodiment, the fixing mechanism 41 includes an equilateral angle steel 411 with an included angle of 0 ° in a 6-degree main bolt hole, and reducing bolts 412 disposed at two free ends of the equilateral angle steel 411, the two reducing bolts 412 are disposed in two adjacent main bolt holes, and an included angle portion of the equilateral angle steel 411 is connected with the connecting mechanism. In this embodiment, as shown in fig. 1, the reducing bolt 412 is screwed to the main bolt hole. The included angle portion of the equilateral angle iron 411 in this embodiment is rotatably connected to the connecting mechanism.
Further, as a preferred embodiment, the connection mechanism includes a first hexagon bolt and a long screw, the first hexagon bolt is in threaded connection with the long screw, the long screw passes through the included angle portion and is connected with the upper end of the teflon rod 421, and the first hexagon bolt is used for fixing the included angle portion on the long screw. As shown in fig. 1, an external thread is provided on the outer peripheral wall of the long screw, an internal thread is provided on the inner wall of the first hexagon bolt for matching with the external thread on the screw, and the long screw is used for fixing the equilateral angle steel 411 on the polytetrafluoroethylene rod 421.
Further, as a preferred embodiment, the connection mechanism further comprises a flat washer and a compression nut, the long screw is further provided with the compression nut and the flat washer, the compression nut is located on the lower side of the included angle portion, and the flat washer is located between the compression nut and the polytetrafluoroethylene rod 421.
Further, as a preferred embodiment, a groove is formed between the inner peripheral wall of the basket flange 2 and the upper surface of the pressure vessel flange 3, a centering pin hole is formed on the bottom wall of the groove, the polytetrafluoroethylene rod 421 is arranged in the centering pin hole, and a gap of at least 5mm of a compression nut is formed between the outer peripheral wall of the polytetrafluoroethylene rod 421 and the inner peripheral wall of the centering pin hole.
Further, as a preferred embodiment, the adjusting mechanism 42 further includes a second hexagon bolt 423 and an angle steel 424, one end of the adjusting top thread 422 passes through the angle steel 424 and is rotatably connected with the teflon rod 421, and the second hexagon bolt 423 is disposed on the angle steel 424 and is used for fixing the angle steel 424 on the bottom wall of the groove.
Further, as a preferred embodiment, the polytetrafluoroethylene rod 421 further comprises a backing plate 425 compression nut and a self-tapping screw 426 main bolt hole, wherein the backing plate 425 compression nut is arranged on the polytetrafluoroethylene rod 421, the self-tapping screw 426 main bolt hole is used for fixing the backing plate 425 compression nut on the polytetrafluoroethylene rod 421, and one end of the adjusting jackscrew 422 is rotatably connected with the backing plate 425 compression nut.
Further, as a preferred implementation mode, the pressure vessel further comprises a dial indicator, the bottom wall of the groove is provided with the dial indicator, and a measuring rod of the dial indicator abuts against a lower in-pile component located in the pressure vessel 1.
The preferred method of adjusting the position of the lower internals of a nuclear power plant according to the invention is described below.
A method for adjusting the position of a lower reactor internals of a nuclear power plant comprises the following steps:
s1, hoisting the lower reactor internals into the pressure vessel 1 by the annular hoisting equipment, and hoisting 95-99% of the weight of the lower reactor internals by the annular hoisting equipment to enable the lower reactor internals to reach the hoisting critical state; in this embodiment, after the lower internals are first hoisted into the pressure vessel 1, about 95% to 99% by weight of the lower internals are hoisted by using a ring hoisting apparatus to reach a critical state. Four sets of adjusting tools 4 designed and manufactured on site are matched to realize horizontal movement of the lower reactor internals in the pressure vessel 1 along four directions of 0-180 degrees, 90-270 degrees and clockwise or anticlockwise rotation along the center circumference of the pressure vessel 1, and the adjusting amount is monitored in real time by a dial indicator in the adjusting process. By adjusting the position of the lower in-pile component until the requirement that the gap between a hanging basket outlet nozzle of the lower in-pile component and an outlet connecting pipe of the pressure container 1 is 2.35 +/-0.13 mm and the gap between a flange of the lower in-pile component and the inner wall of the pressure container 1 is 6 +/-1 mm is met at the same time, the centering pin is arranged in a centering pin hole of the pressure container 1, and then the lower pin shaft can be inserted into the centering pin hole after the lower in-pile component flange is installed.
S2, determining the adjusting mode and the adjusting amount of the adjusting tool 4 according to the first inspection result after the lower in-pile component is hung into the pressure vessel 1;
the adjusting mode comprises a horizontal adjusting mode and a circumferential adjusting mode;
the horizontal adjustment mode is as follows: loosening the adjusting jackscrews 422 in the adjusting tools 4 positioned at 90-degree and 270-degree positions, loosening the adjusting jackscrews 422 on the side close to 90-degree in the adjusting tools 4 positioned at 0-degree and 180-degree positions, and tightening and adjusting the adjusting jackscrews 422 on the side close to 270-degree in the adjusting tools 4 positioned at 0-degree and 180-degree positions, so that the lower reactor component can be translated towards 90-degree direction, and corresponding adjusting jackscrews 422 are loosened and tightened in the same way towards other angles;
the circumferential adjusting mode is as follows: the adjusting top threads 422 at one side of 0 degrees, 90 degrees, 180 degrees and 270 degrees are loosened, and then the adjusting top threads 422 at the other side of 0 degrees, 90 degrees, 180 degrees and 270 degrees are screwed and adjusted, so that the rotation of the lower reactor component is realized. When the lower reactor internals move and rotate in the pressure vessel 1, the position and movement of the lower reactor internals in the pressure vessel 1 can be monitored in real time by monitoring the change of the reading of the dial indicator in the adjustment process, thereby realizing the accurate adjustment of the lower reactor internals. And after each adjustment, completely releasing the weight of the lower in-pile member on the supporting surface of the hanging basket, checking and verifying whether the position of the lower in-pile member meets the design requirement, and if the position of the lower in-pile member does not meet the design requirement, adjusting again until the position of the lower in-pile member meets the design requirement.
In this embodiment, after the lower internals are first suspended into the pressure vessel 1, the lower internals nozzle gap, the lower internals flange gap and the inner wall gap of the pressure vessel 1, and the trial assembly results of the centering pin are checked and verified, and if the above three items simultaneously meet the design requirements, the lower internals do not need to be adjusted in position.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The in-place adjusting device for the lower reactor internals of the nuclear power station is characterized by comprising a pressure vessel, a pressure vessel flange arranged on the upper surface of the pressure vessel, a hanging basket flange arranged on the upper surface of the pressure vessel flange and a plurality of adjusting tools fixed on the hanging basket flange, wherein the number of the adjusting tools is four, and the adjusting tools are distributed on the upper surface of the hanging basket flange in a clockwise phase manner of 0 degrees, 90 degrees, 180 degrees and 270 degrees;
each the adjustment instrument all includes fixed establishment and guiding mechanism, fixed establishment sets up on the hanging flower basket flange, guiding mechanism sets up on the pressure vessel flange, wherein, guiding mechanism includes polytetrafluoroethylene stick and locates the adjustment jackscrew of polytetrafluoroethylene stick both sides, the adjustment jackscrew is used for the adjustment the position of polytetrafluoroethylene stick, the upper end of polytetrafluoroethylene stick is equipped with coupling mechanism, the polytetrafluoroethylene stick passes through coupling mechanism with fixed establishment rotates the connection.
2. The device for adjusting the in-situ position of the lower reactor component of the nuclear power station as claimed in claim 1, wherein the basket flange is annular, the upper surface of the basket flange is a basket supporting surface, a plurality of main bolt holes are uniformly formed in the basket supporting surface, the included angle between every two adjacent main bolt holes is 60 degrees, and the fixing mechanism is arranged in every two adjacent main bolt holes.
3. The device for adjusting the in-situ position of the lower reactor component in the nuclear power plant as claimed in claim 2, wherein the fixing mechanism comprises an equilateral angle steel with an included angle of 60 degrees and reducing bolts arranged at two free ends of the equilateral angle steel, the two reducing bolts are arranged in two adjacent main bolt holes, and an included angle part of the equilateral angle steel is connected with the connecting mechanism.
4. The apparatus for adjusting the position of a lower internals according to claim 3, wherein the connecting mechanism comprises a first hexagon bolt and a long screw, the first hexagon bolt is in threaded connection with the long screw, the long screw passes through the clamping corner part and is connected with the upper end of the PTFE rod, and the first hexagon bolt is used for fixing the clamping corner part on the long screw.
5. The apparatus for adjusting the position of a nuclear power plant lower internals according to claim 4, wherein the connecting mechanism further comprises a flat washer and a compression nut, the compression nut and the flat washer are further disposed on the long screw, the compression nut is disposed at the lower side of the clamping portion, and the flat washer is disposed between the compression nut and the PTFE rod.
6. The device for adjusting the in-position of the lower reactor internals of the nuclear power plant as claimed in claim 1, wherein a groove is formed between the inner peripheral wall of the basket flange and the upper surface of the pressure vessel flange, a centering pin hole is formed in the bottom wall of the groove, the polytetrafluoroethylene rod is arranged in the centering pin hole, and a gap of at least 5mm is formed between the outer peripheral wall of the polytetrafluoroethylene rod and the inner peripheral wall of the centering pin hole.
7. The device for adjusting the in-position of the lower internals of the nuclear power plant as claimed in claim 6, wherein the adjusting mechanism further comprises a second hexagon bolt and an angle steel, one end of the adjusting jackscrew passes through the angle steel and is rotatably connected with the polytetrafluoroethylene rod, and the second hexagon bolt is arranged on the angle steel and is used for fixing the angle steel on the bottom wall of the groove.
8. The device for adjusting the in-place of the lower reactor internals of the nuclear power plant as claimed in claim 6, further comprising a backing plate and a self-tapping screw, wherein the backing plate is arranged on the polytetrafluoroethylene rod, the self-tapping screw is used for fixing the backing plate on the polytetrafluoroethylene rod, and one end of the adjusting jackscrew is rotatably connected with the backing plate.
9. The apparatus for adjusting the position of a lower internals in a nuclear power plant according to claim 6, further comprising a dial indicator, wherein the bottom wall of the groove is provided with the dial indicator, and a measuring rod of the dial indicator abuts against the lower internals in the pressure vessel.
10. A method for adjusting the position of a lower internals of a nuclear power plant, comprising the apparatus for adjusting the position of a lower internals of a nuclear power plant according to any one of claims 1 to 9, the method comprising:
s1, hoisting the lower reactor internals into the pressure vessel by the annular hoisting equipment, and hoisting 95-99% of the weight of the lower reactor internals by the annular hoisting equipment to enable the lower reactor internals to reach a hoisting critical state;
s2, determining the adjusting mode and the adjusting amount of the adjusting tool according to the first inspection result after the lower in-pile component is hung into the pressure container;
the adjusting mode comprises a horizontal adjusting mode and a circumferential adjusting mode;
the horizontal adjustment mode is as follows: loosening the adjusting jackscrews in the adjusting tools at 90-degree and 270-degree positions, loosening the adjusting jackscrews close to the 90-degree side in the adjusting tools at 0-degree and 180-degree positions, and tightening and adjusting the adjusting jackscrews close to the 270-degree side in the adjusting tools at 0-degree and 180-degree positions, so that the lower in-pile component can be translated in the 90-degree direction, and corresponding adjusting jackscrews are loosened and tightened in the same way in the translation to other angles;
the circumferential adjusting mode is as follows: loosening the adjusting top threads on one side of 0 degrees, 90 degrees, 180 degrees and 270 degrees, and then screwing and adjusting the adjusting top threads on the other side of 0 degrees, 90 degrees, 180 degrees and 270 degrees to realize the rotation of the lower reactor internals.
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| CN113793708B (en) | 2023-07-07 |
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