CN103047925B - Measure the method for the concentricity of presurized water reactor in-pile component in nuclear power station after centering - Google Patents
Measure the method for the concentricity of presurized water reactor in-pile component in nuclear power station after centering Download PDFInfo
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Abstract
The present invention relates to the installing area of the presurized water reactor in-pile component in nuclear power station.For solving prior art complicated operation, high to personnel requirement, greatly affected by environment, contaminated environment also damages the problem of health.The present invention proposes a kind of method measuring the concentricity of presurized water reactor in-pile component in nuclear power station after centering, by nadir instrument and milscale translational coordination platform by be connected pedestal be arranged on be positioned at upper backup pad 3G hole place tripod on, milscale translational coordination platform is between connection pedestal and nadir instrument, set up the plumb datum line that 3G hole in following core plate is reference point, positioning tool is arranged on the 3G hole site on upper core plate and upper backup pad, measure 3G hole, be recorded as X
3G baseand Y
3G base, X
the upper reactor core of 3Gand Y
the upper reactor core of 3G, X
the upper support of 3Gand Y
the upper support of 3G; Calculate the concentricity of 3G hole group; In like manner, measure and calculate the concentricity of 7C, 7L and 11G hole group.This measuring method is simple to operate, and measurement result is little, pollution-free by the impact of environment, safe fanout free region.
Description
Technical field
The present invention relates to the installation of the presurized water reactor in-pile component in nuclear power station, particularly relate to the method for the concentricity of the presurized water reactor in-pile component after measuring centering.
Background technology
Pressurized water reactor core in nuclear power station is the heart of nuclear power station, and its installation quality represents the life of nuclear power station.When building nuclear power station, after the installation of presurized water reactor in-pile component, must measure its installation accuracy, to determine presurized water reactor in-pile component installation qualification, and then avoid because presurized water reactor in-pile component installs defective and bury great potential safety hazard to the operation of nuclear power station, even cause the catastrophic effect that cannot estimate.
At present, the normal employing distribution 3G as shown in Figure 2 measured with collimator 01 in the upper backup pad 02 of presurized water reactor in-pile component in nuclear power station, upper core plate 03 and lower core plate 04 as shown in Figure 1, the method of the concentricity of 7C, 7L and 11G tetra-hole groups, measures the concentricity of the PWR of Nuclear Power Station in-pile component after centering.For 3G hole group, concrete measuring process is as follows:
The first, collimator plumb datum line is set up according to autocollimation principle:
First collimator is placed in by collimator jaw on the 3G hole site on upper backup pad, and by frame level, collimator is adjusted to vertical state.Then, the center in the 3G hole in following core plate is datum mark, and is arranged on by register pin 2 by positioning tool 1 as shown in Figure 3 on the 3G hole in lower core plate.Then, cylindrical mercury pool is placed in the light target hole 11 on positioning tool 1, the mercury that 3-4mm (millimeter) is dark is injected in mercury pool, after covering mercury pool lid, the central point in the 3G hole in the central point of " ten " wordline that mercury pool covers and lower core plate is positioned on same vertical curve.Then, the telescope on collimation instrument is focused, and " ten " wordline covered with the mercury pool can clearly observed in the 3G hole in lower core plate is as the criterion.When " ten " word and telescopical center " ten " word that a mercury pool covers clearly can be observed in telescope, mobile collimator jaw, two " ten " words are overlapped, then, reusing frame level adjustment collimator makes it be in vertical state, and take off mercury pool lid, the telescopical focal length of adjustment collimator is on mercury face, after clearly can observing " ten " word silk image that mercury face is reflected, the plumb datum line of collimator on reference point is set up.
The second, the 3G hole in lower core plate is measured:
Remove mercury pool, foot piece light target is inserted in the light target hole 11 of positioning tool 1, and the vertical, horizontal micrometer wheel rotated on collimator, make the center of " ten " word on collimator telescope and the center superposition of foot piece light target, the reading on record vertical, horizontal micrometer wheel is respectively X
3G baseand Y
3G base.
Three, the 3G hole on upper core plate is measured:
Positioning tool 1 is arranged on the 3G hole site on upper core plate, and foot piece light target is inserted in the light target hole 11 on positioning tool 1, collimation instrument telescope is focused, make the center of " ten " word on collimator telescope and the center superposition of foot piece light target, the reading on record vertical, horizontal micrometer wheel is respectively X
the upper reactor core of 3Gand Y
the upper reactor core of 3G.
Four, the 3G hole on upper backup pad is measured:
First positioning tool 1 is arranged on the 3G hole site on upper backup pad, and foot piece light target is inserted in the light target hole 11 on positioning tool 1, regulate the telescopical focal length of collimator, make the center of " ten " word on collimator telescope and the center superposition of foot piece light target, the reading on record vertical, horizontal micrometer wheel is respectively X
the upper support of 3Gand Y
the upper support of 3G.
Five, the concentricity of 3G hole group is calculated:
3G hole on upper core plate is respectively relative to the deviate of 3G hole in vertical, horizontal in lower core plate:
Δ X
3G1=X
the upper reactor core of 3G-X
3G base,
Δ Y
3G1=Y
the upper reactor core of 3G-Y
3G base,
3G hole on upper core plate relative to the concentricity in the 3G hole in lower core plate is:
3G hole on upper backup pad is respectively relative to the deviate of 3G hole in vertical, horizontal on upper core plate:
Δ X
3G2=X
the upper support of 3G-X
the upper reactor core of 3G,
Δ Y
3G2=Y
the upper support of 3G-Y
the upper reactor core of 3G,
3G hole on upper backup pad relative to the concentricity in the 3G hole on upper core plate is:
Six, in like manner measure and calculate the concentricity of 7C, 7L and 11G hole group.
Although adopt this measuring method can draw the concentricity of 3G, 7C, 7L and 11G tetra-hole groups through survey calculation, but, before the concentricity utilizing collimator to 3G, 7C, 7L and 11G tetra-hole groups is measured, autocollimation image must be utilized to set up the plumb datum line of collimator according to autocollimation principle.When utilizing the autocollimation image of collimator to set up its plumb datum line, for ensureing that mirror surface is positioned at level, and have good reflecting effect, select the mercury face being positioned at mercury pool as reflecting surface, this just causes producing following problem:
First: when setting up collimator plumb datum line in this measuring method, complicated operation, consuming time longer, be applicable to set up maintain static, the datum line of Long-Time Service, as the manufacture axis of aircraft, steamer etc., and be not suitable for the datum line setting up interim measurement;
Second: the optics micro-alignment instrument complicated operation of employing, set up benchmark length consuming time, and utilize the mercury face of liquid mercury to set up plumb datum, require high to the professional skill of survey crew;
3rd: require very high to ambient environmental conditions, the sound wave in environment, air-flow, electromagnetic wave, vibrations, smog, dust etc. all can have an impact to mercury face, and then cause the collimator datum line of foundation inaccurate, cause measurement result inaccurate;
4th: when setting up plumb datum line, with mercury as reflecting surface, because mercury is volatile and poisonous, contaminated environment and infringement health.
For solving the problem, the method for the concentricity of presurized water reactor in-pile component in nuclear power station after a kind of measurement centering newly need be developed.
Summary of the invention
For solving the concentricity complicated operation adopting prior art to measure presurized water reactor in-pile component in the nuclear power station after centering, length consuming time, require high to survey crew, measurement result is greatly affected by environment, mercury face is used to set up plumb datum line, contaminated environment also damages the problem of the health of human body of workmen, and the present invention proposes a kind of method measuring the concentricity of presurized water reactor in-pile component in nuclear power station after centering, and this measuring method comprises the steps:
The first, tripod is placed on the 3G hole site on the upper backup pad of described presurized water reactor in-pile component, and milscale coordinate translation platform and nadir instrument are arranged on described tripod by connecting pedestal, and described milscale coordinate translation platform is between described connection pedestal and described nadir instrument;
The second, the described presurized water reactor in-pile component alignment degree positioning tool of measurement is arranged on the 3G hole site in the lower core plate of described presurized water reactor in-pile component, and foot piece light target is inserted in the light target hole on described positioning tool, the platform of milscale coordinate translation described in regulating step one makes the center of described nadir instrument telescopical " ten " word and the described center superposition being positioned at foot piece light target in lower core plate on 3G hole site, and X, Y reading recorded on described milscale coordinate translation platform is X
3G baseand Y
3G base;
Three, the measuring method that same step two-phase is same is adopted, described positioning tool is installed in 3G hole site on the upper core plate and upper backup pad of described presurized water reactor in-pile component, measure the upper core plate on described presurized water reactor in-pile component and the 3G hole on upper backup pad, X, Y reading recorded on described milscale coordinate translation platform is X
the upper reactor core of 3G, Y
the upper reactor core of 3G, X
the upper support of 3Gand Y
the upper support of 3G;
Four, the X adopting step 2, three to obtain
3G base, Y
3G base, X
the upper reactor core of 3G, Y
the upper reactor core of 3G, X
the upper reactor core of 3Gand Y
the upper reactor core of 3Gcalculate the concentricity of 3G hole group, in like manner, measure and calculate the concentricity of 7C, 7L or 11G hole group.
The centring concentric degree of this measuring method to the presurized water reactor in-pile component in nuclear power station is adopted to measure, simple to operate, consuming time short, it is convenient to measure, and measurement result is little by the impact of environment, does not need to use mercury, pollution-free, can not cause damage to the health of workmen, safety.
Preferably, in the first step of this measuring method, by regulating described tripod and described connection pedestal by the leveling of described nadir instrument.Like this, by regulating tripod and the foot screw connected on pedestal, leveling is carried out to nadir instrument, instrument at the bottom of leveling day after tomorrow is fixed on by foot screw and connects on pedestal, can not move horizontally run-off the straight in process, can ensure that the vertical centerline of nadir instrument is in vertical state.
Preferably, move horizontally described nadir instrument and carry out initial adjustment, the center of described nadir instrument telescopical " ten " word is overlapped in advance with the described center being positioned at foot piece light target in lower core plate on 3G hole site, and screw the micrometer wheel of described milscale coordinate translation platform, make the center of described nadir instrument telescopical " ten " word and the described center superposition being positioned at foot piece light target in lower core plate on 3G hole site.Like this, level moves nadir instrument, the vertical center line of nadir instrument is overlapped in advance with the foot piece light target center be positioned in lower core plate on 3G hole site, can reduce the adjusting range of milscale coordinate translation platform, improves accuracy of measurement; By the micrometer wheel screwing milscale coordinate translation platform, nadir instrument position is in the horizontal plane finely tuned, can measuring accuracy be improved.
Preferably, in described step 2 or three, when measuring, rotate described nadir instrument in the horizontal plane, and rotate the center superposition to the center with the foot piece light target be positioned on corresponding 3G hole site that make described nadir instrument telescopical " ten " word when 90 °, 180 °, 270 ° and 360 ° at described nadir instrument respectively, record the reading X of X, the Y on described milscale coordinate translation platform respectively
3G1, X
3G2, X
3G3and X
3G4, Y
3G1, Y
3G2, Y
3G3and Y
3G4, calculate X
3Gand Y
3Gmean value,
X
3G＝(X
3G1+X
3G2+X
3G3+X
3G4)/4，
Y
3G＝(Y
3G1+Y
3G2+Y
3G3+Y
3G4)/4。
Further, when described nadir instrument rotates to a certain angle position, at least measure three times, average.Record X, Y reading X on described milscale coordinate translation platform
3G1n, X
3G2n, X
3G3nand X
3G4n, Y
3G1n, Y
3G2n, Y
3G3nand Y
3G4n, pendulous frequency when n is in the rotation to a certain angle position of described nadir instrument, and n>=3, calculate X
3Gand Y
3Gmean value,
X
3G＝[(X
3G11+…+X
3G1n)+(X
3G21+…+X
3G2n)+(X
3G31+…+X
3G3n)+(X
3G41+…+X
3G4n)]/4n，
Y
3G＝[(Y
3G11+…+Y
3G1n)+(Y
3G21+…+Y
3G2n)+(Y
3G31+…+Y
3G3n)+(Y
3G41+…+Y
3G4n)]/4n。
Like this, when measuring same hole, by rotating nadir instrument, multiangular measurement being carried out to this hole, and taking multiple measurements on a certain angle position, by the concentricity in this hole of mean value calculation of measurement result, can further improve the precision of the concentricity calculated through meter.
The measuring method that the present invention proposes, simple to operate, consuming time short, it is convenient to measure, and measurement result is little by the impact of environment, does not need to use mercury, pollution-free, can not damage, safety to human body.In measuring process, the center of telescopical " ten " word of nadir instrument is first made to overlap in advance with the center of the foot piece light target be positioned on 3G hole site, to improve accuracy of measurement by coarse adjustment; Make the center of nadir instrument telescopical " ten " word by fine setting again and be positioned at the center superposition of the foot piece light target on upper backup pad on 3G hole site, to improve measuring accuracy.In addition, when same hole is measured, by rotating nadir instrument, multiangular measurement is carried out to this hole, and take multiple measurements on a certain angle position, with the concentricity of the mean value calculation hole group of measurement result, can further improve the precision of the concentricity calculated.
Accompanying drawing explanation
Fig. 1 is the schematic diagram adopting collimator to measure the concentricity of the presurized water reactor in-pile component after centering in nuclear power station in prior art;
Fig. 2 is the distribution schematic diagram in 3G, 7C, 7L and 11G hole in the presurized water reactor in-pile component in nuclear power station;
Fig. 3 is the perspective view of the alignment degree positioning tool of the presurized water reactor in-pile component measured in nuclear power station;
Fig. 4 is that the present invention adopts nadir instrument to measure the schematic diagram of the concentricity of the presurized water reactor in-pile component after centering in nuclear power station.
Embodiment
Before measurements, first respectively survey instrument is verified.
As shown in Figure 4, tripod 22 is laid in 3G hole site on upper backup pad 21, and milscale coordinate translation platform 24 and nadir instrument (plumb aligner) 25 are arranged on tripod 22 by connecting pedestal 23, and milscale coordinate translation platform 24 is between connection pedestal 23 and nadir instrument 25.Then, by regulating the foot screw of tripod 22 and connection pedestal 23 by nadir instrument 25 leveling, make the horizontal bubble of nadir instrument 25 placed in the middle.
The positioning tool 1 of the alignment degree of the presurized water reactor in-pile component in the measurement nuclear power station shown in Fig. 3 is arranged on the 3G hole site in lower core plate 26, and be fixed in lower core plate 26 by register pin 2, then foot piece light target is inserted in the light target hole 11 on positioning tool 1.
In surface level, mobile nadir instrument 25 to carry out initial adjustment to the position of nadir instrument 25 in surface level, and the center of " ten " word on the telescope on nadir instrument is overlapped in advance with the center of foot piece light target on the 3G hole site be positioned in lower core plate 26; The micrometer screwed on milscale coordinate translation platform 24 is taken turns to finely tune the position of nadir instrument 25 in surface level, make the center superposition of the center of " ten " word on the telescope on nadir instrument 25 and foot piece light target on the 3G hole site being positioned in lower core plate 26, now, the center in the 3G hole in following core plate 26 is that the plumb datum line of reference point has been set up.X on record milscale coordinate translation platform 24, the value X in Y-direction
3G baseand Y
3G base.
3G hole site on the upper core plate 27 of presurized water reactor in-pile component is installed positioning tool 1 as shown in Figure 3, and foot piece light target is inserted in the light target hole 11 on positioning tool 1.First the telescope on nadir instrument is focused, to carry out coarse alignment to the center of " ten " word on the telescope on nadir instrument with the center of the foot piece light target be positioned on upper core plate 27 on 3G hole site, the center of " ten " word on the telescope on nadir instrument is overlapped in advance with the center of the foot piece light target be positioned on upper core plate 27 on 3G hole site.Screw the micrometer wheel of milscale coordinate translation platform again, accurately to aim at the center of the foot piece light target be positioned on upper core plate 27 on 3G hole site to the center of " ten " word on the telescope on nadir instrument, make the center of " ten " word on the telescope on nadir instrument and be positioned at the center superposition of the foot piece light target on upper core plate 27 on 3G hole site.X on record milscale coordinate translation platform 24, the value X in Y-direction
the upper reactor core of 3Gand Y
the upper reactor core of 3G.
3G hole site on the upper backup pad 21 of presurized water reactor in-pile component is installed positioning tool 1 as shown in Figure 3, and foot piece light target is inserted in the light target hole 11 on positioning tool 1.First the telescope on nadir instrument is focused, to carry out coarse alignment to the center of " ten " word on the telescope on nadir instrument with the center of the foot piece light target be positioned on upper backup pad 21 on 3G hole site, the center of " ten " word on the telescope on nadir instrument is overlapped in advance with the center of the foot piece light target be positioned on upper backup pad 21 on 3G hole site.Screw the micrometer wheel of milscale coordinate translation platform again, accurately to aim at the center of the foot piece light target be positioned on upper backup pad 21 on 3G hole site the center of " ten " word on the telescope on nadir instrument, make the center of " ten " word on the telescope on nadir instrument and be positioned at the center superposition of the foot piece light target on upper backup pad 21 on 3G hole site.X on record milscale coordinate translation platform 24, the value X in Y-direction
the upper support of 3Gand Y
the upper support of 3G.
Then, according to the concentricity measuring the data calculating 3G hole group obtained.Wherein, the 3G hole on upper core plate is respectively relative to the 3G hole deviate in the x, y direction in lower core plate:
Δ X
3G1=X
the upper reactor core of 3G-X
3G base,
Δ Y
3G1=Y
the upper reactor core of 3G-Y
3G base,
3G hole on upper core plate relative to the concentricity in the 3G hole in lower core plate is:
3G hole on upper backup pad is respectively relative to the 3G hole deviate in the x, y direction on upper core plate:
Δ X
3G2=X
the upper support of 3G-X
the upper reactor core of 3G,
Δ Y
3G2=Y
the upper support of 3G-Y
the upper reactor core of 3G,
3G hole on upper backup pad relative to the concentricity in the 3G hole on upper core plate is:
When 3G hole in nuclear power station in presurized water reactor in-pile component is measured, nadir instrument is rotated in surface level, and when this nadir instrument rotates to 90 °, 180 °, 270 ° and 360 °, all milscale coordinate translation platform is regulated, make the center of " ten " word on the telescope on nadir instrument and the center superposition of the foot piece light target be positioned on corresponding 3G hole site, and the rotation of record nadir instrument is X to the micrometering wheel reading in the X direction on milscale coordinate translation platform when 90 °, 180 °, 270 ° and 360 ° respectively
3G1, X
3G2, X
3G3and X
3G4, reading is in the Y direction Y
3G1, Y
3G2, Y
3G3with
y3G4.When calculating the concentricity of 3G hole group, 3G hole mean value is in the X direction X
3G, mean value is in the Y direction Y
3G, that is:
X
3G＝(X
3G1+X
3G2+X
3G3+X
3G4)/4，
Y
3G＝(Y
3G1+Y
3G2+Y
3G3+Y
3G4)/4。
For improving the precision of the concentricity of the hole group obtained through survey calculation further, when nadir instrument rotates to 90 °, 180 °, 270 ° and 360 °, each position at least measures three times, and the reading recording the micrometering wheel on milscale coordinate translation platform is X
3G1n, X
3G2n, X
3G3nand X
3G4n, Y
3G1n, Y
3G2n, Y
3G3nand Y
3G4n, (n be nadir instrument rotate to an angle position time pendulous frequency, and n>=3).When calculating the concentricity of 3G hole group, 3G hole mean value is in the X direction X
3G, mean value is in the Y direction Y
3G, that is:
X
3G＝[(X
3G11+…+X
3G1n)+(X
3G21+…+X
3G2n)+(X
3G31+…+X
3G3n)+(X
3G41+…+X
3G4n)]4n
Y
3G＝[(Y
3G11+…+Y
3G1n)+(Y
3G21+…+Y
3G2n)+(Y
3G31+…+Y
3G3n)+(Y
3G41+…+Y
3G4n)]4n
In like manner, the center in 7C, 7L and 11G hole respectively in following core plate is reference point, measures and calculates the centring concentric degree of 7C, 7L and 11G hole group.
Finally, measuring accuracy the present invention being measured to the method for the concentricity of presurized water reactor in-pile component in the nuclear power station after centering is verified.
When select specification be 1/200000 come card NL nadir instrument, come card GDF22 connect pedestal and GMT5 milscale coordinate translation platform time, comprehensive maximum error source is respectively:
A, come card NL nadir instrument be m to point Linear error
1, m
1=0.05mm;
The error of b, positioning tool is m
2, m
2=0.04mm;
The mismachining tolerance of the concentricity of the centring hole in c, presurized water reactor in-pile component is m
3, m
3=0.01mm;
The error of d, connection pedestal is m
4: m
4=0.02mm;
Because above-mentioned error has correlativity independently of one another, not, therefore composite measurement medial error M can be calculated by Error Theory formula:
I.e. M=± 0.07mm
From the above, by precision estimation nadir instrument Alignment measuring medial error be: 0.07mm.Learn according to theory of errors, the possibility that the true error being greater than medial error occurs is about 32%; The possibility that the true error being greater than 2 times of medial error occurs is about 5%.Known according to " Code for engineering surveying GB50026-2007 ", usually get the limit of 2 times of medial error as error in measurement, it is poor that the permissible error specified in namely measuring or title are limit, that is:
Δ
allow=2M=2 × 0.07mm=0.14mm < 0.25mm.
From above-mentioned precision analysis, come card NL nadir instrument is adopted to coordinate milscale coordinate translation platform vertical centering measuring method, the error of centralization that can meet the main shaft of the upper core plate of presurized water reactor in-pile component in nuclear power station and the main shaft of lower core plate is less than the designing requirement of 0.25mm, therefore the present invention is applicable to the measurement of the concentricity of the presurized water reactor in-pile component in the nuclear power station after to centering.
Claims (5)
1. measure a method for the concentricity of presurized water reactor in-pile component in nuclear power station after centering, it is characterized in that, this measuring method comprises the steps:
The first, tripod is placed on the 3G hole site on the upper backup pad of described presurized water reactor in-pile component, and milscale coordinate translation platform and nadir instrument are arranged on described tripod by connecting pedestal, and described milscale coordinate translation platform is between described connection pedestal and described nadir instrument;
The second, the described presurized water reactor in-pile component alignment degree positioning tool of measurement is arranged on the 3G hole site in the lower core plate of described presurized water reactor in-pile component, and foot piece light target is inserted in the light target hole on described positioning tool, the platform of milscale coordinate translation described in regulating step one makes the center of described nadir instrument telescopical " ten " word and the described center superposition being positioned at foot piece light target in lower core plate on 3G hole site, and X, Y reading recorded on described milscale coordinate translation platform is X
3G baseand Y
3G base;
Three, the measuring method that same step two-phase is same is adopted, described positioning tool is installed in 3G hole site on the upper core plate and upper backup pad of described presurized water reactor in-pile component, measure the 3G hole on the upper core plate of described presurized water reactor in-pile component and upper backup pad, X, Y reading recorded on described milscale coordinate translation platform is X
the upper reactor core of 3G, Y
the upper reactor core of 3G, X
the upper support of 3Gand Y
the upper support of 3G;
Four, the X adopting step 2, three to obtain
3G base, Y
3G base, X
the upper reactor core of 3G, Y
the upper reactor core of 3G, X
the upper reactor core of 3Gand Y
on 3G reactor corecalculate the concentricity of 3G hole group, in like manner, measure and calculate the concentricity of 7C, 7L or 11G hole group.
2. the method for the concentricity of presurized water reactor in-pile component in nuclear power station after measurement centering according to claim 1, is characterized in that, in the first step of this measuring method, by regulating described tripod and described connection pedestal by the leveling of described nadir instrument.
3. the method for the concentricity of presurized water reactor in-pile component in nuclear power station after measurement centering according to claim 1, it is characterized in that, in described step 2, move horizontally described nadir instrument and carry out initial adjustment, the center of described nadir instrument telescopical " ten " word is overlapped in advance with the described center being positioned at foot piece light target in lower core plate on 3G hole site, and screw the micrometer wheel of described milscale coordinate translation platform, make the center of described nadir instrument telescopical " ten " word and the described center superposition being positioned at foot piece light target in lower core plate on 3G hole site.
4. according to the method for the concentricity of presurized water reactor in-pile component in nuclear power station after the measurement centering in claim 1-3 described in any one, it is characterized in that, in described step 2 or three, rotate described nadir instrument in the horizontal plane, and rotate the center superposition to the center with the foot piece light target be positioned on corresponding 3G hole site that make described nadir instrument telescopical " ten " word when 90 °, 180 °, 270 ° and 360 ° at described nadir instrument respectively, record the reading X of X, the Y on described milscale coordinate translation platform respectively
3G1, X
3G2, X
3G3and X
3G4, Y
3G1, Y
3G2, Y
3G3and Y
3G4, calculate X
3Gand Y
3Gmean value.
5. the method for the concentricity of presurized water reactor in-pile component in nuclear power station after measurement centering according to claim 4, is characterized in that, when described nadir instrument rotates to a certain angle position, at least measure three times, average.
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| CN103500591A (en) * | 2013-09-29 | 2014-01-08 | 中广核工程有限公司 | Cold test mis-centering device for reactor control rod drive wire of nuclear power plant |
| CN105783891B (en) * | 2016-03-21 | 2018-09-04 | 东方电气（武汉）核设备有限公司 | A kind of method of PWR of Nuclear Power Station in-pile component laser alignment centering |
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