CN101645315B - Method for removing support positioning structure of irradiation monitoring pipe - Google Patents
Method for removing support positioning structure of irradiation monitoring pipe Download PDFInfo
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- CN101645315B CN101645315B CN2009101699440A CN200910169944A CN101645315B CN 101645315 B CN101645315 B CN 101645315B CN 2009101699440 A CN2009101699440 A CN 2009101699440A CN 200910169944 A CN200910169944 A CN 200910169944A CN 101645315 B CN101645315 B CN 101645315B
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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 provides a method for removing a support positioning structure of an irradiation monitoring pipe, comprising the following steps: (a) incising all the bolts on the support positioning structure of the irradiation monitoring pipe; (b) incising all the position pins on the support positioning structure of the irradiation monitoring pipe; (c) incising all the welding lines between the support brackets of the rest layers of the support positioning structure of the irritation monitoring pipe except the intermediate layer thereof and the hanging basket wall; (d) lifting the support positioning structure of the irritation monitoring pipe and incising the welding lines between the support bracket of the intermediate layer of the support positioning structure of the irritation monitoring pipe and the hanging basket wall to lead the support positioning structure of the irritation monitoring pipe to be disassembled into a plurality of support brackets; and (e) incising the obtained multiple support brackets by three sections, and placing into a lead shielding container after incising. The method in the invention can lead the incision trace of the hanging basket wall to be neat and smooth, thus facilitating mounting a new support positioning structure of the irritation monitoring pipe.
Description
Technical field
The present invention relates to the nuclear power plant equipment service technique, be specifically related to the method for dismounting of a kind of pressurized-water reactor nuclear power plant through the support positioning structure of irradiation monitoring pipe behind the irradiation.
Background technology
Irradiation monitoring pipe is the change device of situation of monitoring response core pressure vessel material material character behind neutron irradiation; In pipe, be equipped with reactor pressure vessel cylindrical shell mother metal and the same material of weld seam, same heat (batch) number, with the irradiation monitoring pipe sample of technology and neutron flux measurement sheet, thermometric alloy etc., on the cylindrical of connecting pipe and grappling fixture, be provided with support fin and support spring.
After support spring in the support positioning structure of irradiation monitoring pipe and the fracture of ribs sheet, sample hose lacks fixing, and sample hose can break or rupture under the impact of vibration and current, loses the meaning of its supervision.And support fin that ruptures and spring can become metallic foreign body in pressure vessel inside, under the impact of current, can cause damage to fuel assembly and pressure vessel, threaten safe operation.If this defective is not eliminated, when fracture or other defect took place the irradiation monitoring pipe sample hose, power plant will stop transport, the loss that causes and influence inestimable.
Repairing support positioning structure of irradiation monitoring pipe is accomplished by following step: pack into special container → irradiation monitoring pipe is transported to the old support positioning structure of irradiation monitoring pipe → scene installation new support positioning structure of irradiation monitoring pipe of hot cell transformation → scene dismounting behind irradiation → improved irradiation monitoring pipe is packed in the new support → hanging basket return heap of all irradiation monitoring pipes is deposited on the hanging basket storage rack → taken out to hanging basket.And remove old support positioning structure of irradiation monitoring pipe is very important processing step wherein.
Summary of the invention
The object of the present invention is to provide a kind of cutting vestige of hanging basket barrel that can let smooth, smooth, be convenient to the method for dismounting of the pressurized-water reactor nuclear power plant of new support positioning structure of irradiation monitoring pipe installation through the support positioning structure of irradiation monitoring pipe behind the irradiation.
Realize the technical scheme of the object of the invention: a kind of method for dismounting of support positioning structure of irradiation monitoring pipe, it carries out as follows successively:
(a) all bolts on elder generation's cutting support positioning structure of irradiation monitoring pipe;
(b) cut all register pins on the support positioning structure of irradiation monitoring pipe again;
(c) cut the supporting bracket of support positioning structure of irradiation monitoring pipe all the other each layers except that middle one deck and all weld seams of hanging basket barrel then;
(d) support positioning structure of irradiation monitoring pipe of slinging, middle one deck supporting bracket and the weld seam of hanging basket barrel of cutting support positioning structure of irradiation monitoring pipe make that the support positioning structure of irradiation monitoring pipe disintegration is some supporting brackets;
(e) divide three sections cuttings to some supporting brackets of gained at last, put into the lead shield container after the cutting.
When cutting each bolt in the method for dismounting of aforesaid a kind of support positioning structure of irradiation monitoring pipe, its step (a), earlier this bolt is carried out rough lumber and cuts, again this bolt is carried out the essence cutting; Cut the part that does not cut to after the bolt distortion from above-mentioned rough lumber during smart the cutting and begin cutting.
When cutting each register pin in the method for dismounting of aforesaid a kind of support positioning structure of irradiation monitoring pipe, its step (b), earlier register pin is carried out rough lumber and cuts, again register pin is carried out the essence cutting; Cut the part that does not cut to after the register pin distortion from above-mentioned rough lumber during smart the cutting and begin cutting.
When cutting the weld seam of every layer of supporting bracket and hanging basket barrel in the method for dismounting of aforesaid a kind of support positioning structure of irradiation monitoring pipe, its step (c), first butt welded seam carries out rough lumber and cuts, and butt welded seam carries out the essence cutting again; Cut the part that does not cut to behind the seam deformation from above-mentioned rough lumber during smart the cutting and begin cutting; When cutting the weld seam of middle one deck supporting bracket and hanging basket barrel in the step (d), first butt welded seam carries out rough lumber and cuts, and butt welded seam carries out the essence cutting again; Cut the part that does not cut to behind the seam deformation from above-mentioned rough lumber during smart the cutting and begin cutting.
Effect of the present invention is: method for dismounting according to the invention is in the irradiated old support positioning structure of irradiation monitoring pipe process of cutting; Excise all bolts earlier; Excise all register pins again; Excise weld seam at last, this order can let the cutting vestige of hanging basket barrel smooth, smooth, is convenient to the installation of new support positioning structure of irradiation monitoring pipe.Simultaneously, when cutting bolt, register pin and weld seam, adopt thick, smart cutting twice; Do not change electrode after the smart cutting and carry out the technology that rough lumber is next time cut, both excised bolt, register pin and weld seam fully, fully played the effect of electrode again; Better controlled the use cost of electrode; Also reduce the workload of changing electrode, reduced the risk that foreign matter is fallen into refuelling pool, reduced the radiation dose that operating personnel accept.
Description of drawings
Fig. 1 is the structural representation of support positioning structure of irradiation monitoring pipe;
Fig. 2 is a support positioning structure of irradiation monitoring pipe supporting bracket partial view;
Among the figure: 1. register pin; 2. weld seam; 3. bolt; 4. supporting bracket; 5. protecting pipe; 6 hanging basket barrels.
Embodiment
Further describe below in conjunction with accompanying drawing and specific embodiment method for dismounting support positioning structure of irradiation monitoring pipe of the present invention.
As depicted in figs. 1 and 2; Support positioning structure of irradiation monitoring pipe is made up of eight protecting pipes 5, and every protecting pipe has six layers of supporting bracket 4, by register pin 1 location; Be installed on the reactor pressure vessel cradle cylinder body through bolt 3, the weld seam 2 through the supporting bracket both sides is fixed on bracketplant outer wall 6.
Support positioning structure of irradiation monitoring pipe is divided into two groups of symmetries and is fixed on the hanging basket outer tube wall.Can only accomplish as the remote-controlled operation under water of screen layer with boron water through the dismounting work that should support location structure behind the irradiation of several cycles of operation.
The dismounting step of each group support positioning structure of irradiation monitoring pipe is following:
(a) all bolts 3 of each layer of EDM equipment (electric cremate process equipment) cutting support positioning structure of irradiation monitoring pipe of the U.S. of employing earlier Hansvedt company; When each bolt 3 of cutting, adopt graphite electrode that this bolt is carried out rough lumber earlier and cut, adopt graphite electrode that this bolt is carried out the essence cutting again; Used old graphite electrode when when this bolt is cut in rough lumber, adopting in the smart cutting bolt adopts new graphite electrode when this bolt of essence cutting, and graphite electrode is to cut the part that does not cut to behind the electrode deformation from above-mentioned rough lumber to begin cutting during smart cutting.
(b) adopt EDM equipment to cut all register pins 1 of each layer of support positioning structure of irradiation monitoring pipe; When each register pin 1 of cutting, adopt graphite electrode that register pin is carried out rough lumber earlier and cut, adopt graphite electrode that register pin is carried out the essence cutting again; Used old graphite electrode when when register pin is cut in rough lumber, adopting essence to cut a register pin; When essence cutting register pin, adopt new graphite electrode, and graphite electrode is to cut the part that does not cut to behind the electrode deformation from above-mentioned rough lumber to begin cutting during smart cutting.
(c) adopt EMD equipment cutting support positioning structure of irradiation monitoring pipe except that the supporting bracket 4 of middle the 3rd layer of all the other each layer (first and second, four, five, six layers) and all weld seams 2 of hanging basket barrel 6 then; When every layer of weld seam of cutting, adopt the graphite electrode butt welded seam to carry out rough lumber earlier and cut, adopt the graphite electrode butt welded seam to carry out the essence cutting again; Used old graphite electrode when when weld seam is cut in rough lumber, adopting in the smart cutting weld seam adopts new graphite electrode when essence cutting weld seam, and graphite electrode is to cut the part that does not cut to behind the electrode deformation from above-mentioned rough lumber to begin cutting during smart cutting.
(d) adopt the electric block support positioning structure of irradiation monitoring pipe of slinging; Through the 3rd layer the supporting bracket of EMD equipment cutting support positioning structure of irradiation monitoring pipe and the weld seam of hanging basket barrel, make support positioning structure of irradiation monitoring pipe disintegrate and be many supporting brackets 4; When this layer of cutting weld seam, adopt the graphite electrode butt welded seam to carry out rough lumber earlier and cut, adopt the graphite electrode butt welded seam to carry out the essence cutting again; Used old graphite electrode when when weld seam is cut in rough lumber, adopting essence to cut a weld seam adopts new graphite electrode when essence cutting weld seam.
(e) adopt the many supporting brackets three sections cuttings in 4 fens of EDM equipment at last, put into the lead shield container after the cutting gained.
When above-mentioned technology was cut with smart cutting in rough lumber, the technological parameter of employing was as shown in table 1 below.
Table 1
| Parameter | Rough lumber is cut | Smart cutting | |
| The gap initial voltage | 300 | 300 | |
| Electrode | Graphite | Graphite | |
| Electrode is selected | + | + | |
| |
3 | 3 | |
| | FULL | 3/4 | |
| Arc duration | 128 | 128 | |
| The arc duration multiplier | 1.4 | 1.4 | |
| Efficient | 45％ | 40％ | |
| Electric current | 36 | 35 | |
| Dutycycle | 40％ | 40％ | |
| Servo velocity | 4.6 | 4.5 | |
| Gap width | 5.4 | 4.5 |
The present invention is in the irradiated old support positioning structure of irradiation monitoring pipe process of cutting; Excise all bolts earlier; Excise all register pins again; Excise weld seam at last, guaranteed before protecting pipe 5 breaks away from the hanging basket barrels, to accomplish the excision fully of bolt, register pin like this, bolt and register pin can not break in the hole because of old supporting bracket 4 and coming off of protecting pipe 5.When the excision weld seam; Keeping the 3rd layer of weld seam does not cut; Remaining first and second, four, five, six layers of support weld seam excise fully, old supporting bracket 4 every weight are about 18Kg, each long 15mm of the left and right sides weld seam of the 3rd layer of support; Have enough intensity guarantee excised first and second, behind four, five, six layers of support weld seam, what support was firm is fixed on the hanging basket barrel.Before the 3rd layer of weld seam of excision, earlier at the hoisting device support positioning structure of irradiation monitoring pipe of slinging, essence cut the 3rd layer of support weld seam accomplish after the old supporting bracket protecting pipe of this root disengaging hanging basket barrel automatically.This method can let the cutting vestige of hanging basket barrel smooth, smooth, is convenient to the installation of new support.
The present invention mainly is to rely on EDM equipment for the method for dismounting of irradiated old support positioning structure of irradiation monitoring pipe, through the graphite electrode discharge, produces the high temperature of moment, and the deposite metal realizes removing.Because electrode is lossy in cutting process, electrode waste after cutting is accomplished is about 11%～15%, and electrode is accomplished occiput in cutting and become taper, can cause minimum a part of bolt and register pin not to be excised, and stays in screw and the dowel hole.After completion is cut in screw and dowel hole rough lumber, change one group of new electrode, carried out the essence cutting to just carrying out the hole that rough lumber cuts.Electrode is partly to begin cutting from the workpiece that does not cut to after electrode deformation is cut in rough lumber during smart cutting, and after the essence cutting, the loss of electrode is very little, and the leading edge deformation amount is very little, can be with bolt and register pin complete resection.
If weld seam does not excise totally, final old supporting bracket can't come off from the hanging basket barrel.In order to excise weld seam between old supporting bracket and the hanging basket barrel fully,, excises weld seam a part of weld seam when cutting earlier.After completion is cut in the first pass rough lumber, change one group of new electrode, carried out the essence cutting to just carrying out the weld seam that rough lumber cuts; During smart the cutting; Electrode begins cutting from the root of support basically, and export license is very little after the smart cutting, and the electrode after the smart cutting need not to change direct rough lumber and cuts off a weld seam.
Claims (4)
1. the method for dismounting of a support positioning structure of irradiation monitoring pipe, it is characterized in that: this method is carried out as follows successively:
(a) all bolts (3) on elder generation's cutting support positioning structure of irradiation monitoring pipe;
(b) cut all register pins (1) on the support positioning structure of irradiation monitoring pipe again;
(c) cut the supporting bracket (4) of support positioning structure of irradiation monitoring pipe all the other each layers except that middle one deck and all weld seams (2) of hanging basket barrel (6) then;
(d) support positioning structure of irradiation monitoring pipe of slinging, middle one deck supporting bracket and the weld seam of hanging basket barrel (6) of cutting support positioning structure of irradiation monitoring pipe make that the support positioning structure of irradiation monitoring pipe disintegration is some supporting brackets (4);
(e) at last to three sections cuttings of some supporting brackets (4) branch of gained, put into the lead shield container after the cutting.
2. the method for dismounting of a kind of support positioning structure of irradiation monitoring pipe according to claim 1 is characterized in that: when cutting each bolt (3) in the step (a), earlier this bolt is carried out rough lumber and cuts, again this bolt is carried out the essence cutting; Cut the part that does not cut to after the bolt distortion from above-mentioned rough lumber during smart the cutting and begin cutting.
3. the method for dismounting of a kind of support positioning structure of irradiation monitoring pipe according to claim 1 is characterized in that: when cutting each register pin (1) in the step (b), earlier register pin is carried out rough lumber and cuts, again register pin is carried out the essence cutting; Cut the part that does not cut to after the register pin distortion from above-mentioned rough lumber during smart the cutting and begin cutting.
4. the method for dismounting of a kind of support positioning structure of irradiation monitoring pipe according to claim 1 is characterized in that: during the weld seam of every layer of supporting bracket of cutting (4) and hanging basket barrel (6), first butt welded seam carries out rough lumber and cuts in the step (c), and butt welded seam carries out essence cutting again; Cut the part that does not cut to behind the seam deformation from above-mentioned rough lumber during smart the cutting and begin cutting; When cutting the weld seam of middle one deck supporting bracket (4) and hanging basket barrel (6) in the step (d), first butt welded seam carries out rough lumber and cuts, and butt welded seam carries out the essence cutting again; Cut the part that does not cut to behind the seam deformation from above-mentioned rough lumber during smart the cutting and begin cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101699440A CN101645315B (en) | 2009-09-11 | 2009-09-11 | Method for removing support positioning structure of irradiation monitoring pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101699440A CN101645315B (en) | 2009-09-11 | 2009-09-11 | Method for removing support positioning structure of irradiation monitoring pipe |
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| CN101645315A CN101645315A (en) | 2010-02-10 |
| CN101645315B true CN101645315B (en) | 2012-08-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105489259B (en) * | 2014-09-18 | 2017-06-16 | 中国核动力研究设计院 | Reactor pressure vessel longevity phase irradiation method |
| CN113205895A (en) * | 2021-04-26 | 2021-08-03 | 中广核工程有限公司 | Neutron irradiation monitoring system and method for reactor pressure vessel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3773615A (en) * | 1969-06-06 | 1973-11-20 | Combustion Eng | Irradiation surveillance capsule assemblies for nuclear reactors |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3773615A (en) * | 1969-06-06 | 1973-11-20 | Combustion Eng | Irradiation surveillance capsule assemblies for nuclear reactors |
Non-Patent Citations (3)
| Title |
|---|
| 万德华等.核压力容器材料辐照监督管的设置.《核动力工程》.1984,第5卷(第2期),20-27. * |
| 王成林.核电站水下修复项目HDS关键技术研究.《浙江工业大学硕士学位论文》.2008,19-20. * |
| 黄庆等.辐照监督管支承定位结构的载荷分析与应力评定.《原子能科学技术》.2008,第42卷528-531. * |
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| CN101645315A (en) | 2010-02-10 |
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