JP3072501B2 - A holding and rotating device for measuring and inspecting the accuracy of welding position of a rectangular water channel in a fuel assembly for a boiling water reactor. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling water nuclear fuel assembly which is used for high burn-up as is known, and includes a square water channel as one component thereof.
In the case where each member such as the upper end plug, the small diameter tube, and the connecting member, and the water channel square tube and the lower end plug is manufactured by continuous bonding means such as TIG or laser welding means, the welding attachment position of each of the above members In order to check whether the accuracy satisfies the required standard value, the amount of axial runout of each member is measured and inspected, so that the square water channel can be rotated while being securely held. Related to a rotating device.

[0002]

2. Description of the Related Art As is known, a boiling water nuclear fuel assembly a
As illustrated in FIG. 6, between the upper tie plate b and the lower tie plate c, a large number of fuel elements d and water channels e are vertically mounted and held apart by a plurality of required spacers f. It has a configuration. Here, the above water channel e, those called conventional round is used, which is an upper end plug e ₁ and the lower end plug e ₂ in the upper and lower ends of the respective water channel round tube e ₃ Match,
In this state, they are connected by welding means.

[0003] Therefore, when the above-mentioned round water channel e is being manufactured or after the manufacture is completed, the axial runout is measured as described above, and the axial center of the water channel e and the upper end plug e are measured. It is required to strictly manage the difference by examining how much the difference between the axis values is generated with respect to _one axis. That is, when or have a slight inclination to the welds of each member, or the upper end plug e ₁ is has become impossible inserted Hamaana hole (not shown) of the upper tie plate b, the above inclination even fitted if, takes bending load through the fuel to the water channel round tube e _3, it's also a factor to cause this result large creep deformation.

Therefore, when the above-mentioned inspection is performed on the water channel e, which has been round,
RetsuSo placing a pair of V-block h on street platen g shown in FIG. 5, the V-type mounting contact surface h ₁ in the water channel round tube e ₃ of the water channel e sideways placing in contact, the water channel e While rotating, the first scale i ₁ is brought into contact with the water channel round tube e ₃ and the second scale i ₂ is brought into contact with the outer peripheral surface of the upper end plug e ₁ as shown in the illustrated example. I'm trying to do it.

In FIG. 5B, the difference between the axial value of the water channel round tube e _{3 and} the axial value of the upper end plug e ₁ is represented by L. The first, using the first scale i ₁ and the second scale i _2, the point A of the water channel round tube e ₃ in FIG. (B) With O, the upper end plug e ₁
Is measured, and after the water channel e is rotated by 180 ° on the V block h, the measurement is performed on the points B and b. Similarly, the C point is set to 0, the C point is measured, and the D point and the d point are further measured by 180 ° rotation.

A, B, C, D obtained as described above
And the measured values of the points a, b, c, and d,
Following as obtaining the respective axial position of a water channel e and an upper end plug e _1. Axial position of water channel e: (AB) / 2 =
X, (C−D) / 2 = Y The axial position of the upper end plug e ₁ : (ab) / 2 = x, (c−
d) / 2 = y When the above L is obtained from the above X, Y, x, y, L =
[(X−x) ² + (Y−y) ² ] ^1/2 . And
In practice, 2L is obtained, and if this value is smaller than or equal to the standard value, the inspection result is determined to be acceptable.

In the above-mentioned conventional measurement and inspection, since the water channel e is round, the water channel e is
It is possible to achieve the inspection purpose without any trouble by simply performing the operation of mounting and rotating the water channel. However, in order to satisfy the demand for higher burnup in recent years, a rectangular water channel 1 as shown in FIG. It is supposed to be. In this case, as clearly shown in the figure, the connection round pipe 4 is first round-welded to the upper end plug 2 at the upper welded portion 3a, and the upper end of the connection member 5 is connected to the welded round pipe 4 with the lower end. In addition to round welding at the welding portion 3b, the lower corner of the connecting member 5 is square-welded to the upper corner of the square or hexagonal water channel square tube 6 at the upper corner welding portion 6a. The lower end corner 7 of the water channel square tube 6 is square-welded with the upper end corner of the lower end line 7 at the lower square mouth welding portion 6b.

[0008]

Therefore, when the above-mentioned inspection is to be performed on the rectangular water channel 1 as described above, if the V block h is used,
A flat part 6d continuously provided to this through an arc-shaped corner part 6c,
When the mounting surface is to be replaced with the flat portions 6e and 6f after the mounting of the 6e, the square water channel 1 must be lifted and rotated each time. Therefore, in order to perform such an operation, the measuring instrument for measurement must be evacuated so as not to hinder the above-mentioned rotation operation, and it must be reset to a predetermined original position again. Not only is it bad, but the standard in the previous measurement is likely to shift, so that the burden on the operator is increased, there is a problem in reproducibility, etc., and moreover, the measurement requires skill.

The present invention is intended to solve the above-mentioned difficulties. According to the first aspect, instead of mounting a rectangular water channel on a V-block, a required number of rotary fastening chucks are provided. Fit and fix to the square water channel,
Each of these rotary tightening chucks is rotatably mounted on a rotary bearing holder mounted on a surface plate, and not only is it possible to transmit a rotational force to the rotary tightening chuck by a rotary power mechanism, but also, The rotary clamping chuck tool can be freely reduced in diameter using the slit for reducing the diameter of the square tube chuck ring simply by screwing the tightening ring onto the square tube chuck ring fitted with the water channel square tube. I do. By doing so, the water channel square tube can be gripped freely, and further, the square tube chuck ring can be rotatably supported on the rotary bearing holder as described above, so that measurement and inspection can be performed. While reducing the burden on the workers and improving the workability,
The purpose is to increase the reliability of the measurement result.

According to a second aspect of the present invention, two or more of the slits for reducing the diameter of the tubular chuck ring in the first aspect are selected from an inner opening slit, an outer opening slit, and both side opening slits. By arranging a large number of such holes, the tightening and gripping state of the square water channel by the square tube chuck ring is ensured, and the reliability of the measurement and inspection results is further improved.

According to a third aspect of the present invention, in addition to the technical contents of the first aspect, according to the configuration of the rotary bearing holder, a pair of receiving members provided on a lower guide fixed to a footrest. The rotary fastening chuck is rotatably mounted on the bearing roller, and a pair of mounting bearing rollers are provided on the upper guide which is detachable from the lower guide. A pair of outer peripheral shoulders is formed by providing a convex peripheral portion on the surface, and the receiving bearing roller and the mounting bearing roller described above are rollably abutted over the convex peripheral portion, respectively. Accordingly, it is intended to surely prevent the rotary fastening chuck tool from unintentionally detaching from the rotary bearing holder and to ensure smooth rotation of the rectangular water channel.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the first aspect of the present invention, a desired number of rotary bearing holders mounted on a surface plate in a desired number and a square water channel are provided. A rotary fastening chuck tool which is fitted to a plurality of locations and gripped so that it can be fastened freely, and a state in which each of the rotary fastening chuck tools is rotatably mounted on the corresponding rotary bearing holder. A rotary power mechanism for rotating the rectangular water channel about the axis of the water channel square tube by transmitting a rotational force to the one-rotation fastening chuck tool. The fastening chuck tool has a square tube chuck ring body having a chuck square shaft hole in which a water channel square tube can be fitted at an axial center thereof, and a fastening having a larger outer shape and a through hole for fastening. Ring or something In the former square tube chuck ring, a number of slits for reducing the diameter are provided, and an outer peripheral screw for fastening is engraved on the outer peripheral surface near one end surface in the axial direction, and the tightening is performed. A fastening taper peripheral surface is provided so as to be tapered from the terminal end side of the wearing outer male screw toward the other end surface in the axial direction, and the latter fastening ring has a shaft in the fastening shaft hole. On the inner peripheral surface near one end face in the center direction, an inner female screw that is screwed into the outer male screw for fastening the square tube chuck ring is engraved, and the axial center is set from the terminal side of the inner female screw. It is tapered toward the other end surface in the direction, and by screwing the inner peripheral female screw to the outer peripheral male screw for tightening, by pressing the taper peripheral surface for tightening, the diameter of the square tube chuck ring body is reduced, The tapered peripheral surface for diameter reduction makes it possible to grip the water channel square tube fitted in the chuck square shaft hole. It seeks to provide a holding and rotating device to be subjected to member welding position accuracy measurement test of the square water channels in a boiling water reactor fuel assembly, characterized in that have been made.

Further, according to a second aspect, the slit for diameter reduction according to the first aspect is cut in the radial direction from the inner surface of the chuck shaft hole, and is closed on the inner surface of the outer peripheral surface; An outer opening slit that is cut radially from the surface and is closed inside the inner surface of the chuck angular shaft hole, and is radially opened from the inner surface to the outer peripheral surface of the chuck angular shaft hole, and the other end from one end surface in the axial center direction. The content is that two or more of the slits on both sides closed on the inside of the side end face are selected and arranged.

According to a third aspect of the present invention, in addition to the technical content of the first aspect, the rotary bearing holder has a lower guide fixed to a footrest and has a rotation axis in a direction parallel to the axis. While a plurality of pairs of receiving bearing rollers are provided,
An upper guide that is fitted to the rotary fastening chuck tool mounted on the receiving bearing roller and that is fixed to the lower guide so as to be detachable, and an upper guide that is provided in a direction parallel to the axis. At least one pair of contact bearing rollers having a rotation axis are provided, and furthermore, a convex peripheral portion is provided on the outer peripheral surface of the tightening ring, so that the inner peripheral female screw side is provided. A certain outer peripheral shoulder surface and an outer peripheral shoulder surface which is a tapered peripheral surface side for diameter reduction are formed, and the pair of receiving bearing rollers and the mounting bearing roller are respectively straddled on the two outer peripheral shoulder surfaces, each straddling the convex peripheral portion. It is configured to be abutted.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to achieve the above object, according to the present invention, as shown in FIG. A rotary bearing holder 11 mounted and arranged, a rotary tightening chuck tool 12 fitted to a plurality of desired locations of the rectangular water channel 1 and capable of being gripped so as to be freely tightened, and a rotary tightening chuck for these. Each of the rotary bearing holders 11
The rotation of the square water channel 1 gripped by the rotary bearing holder 11 is achieved by transmitting rotational force to one of the rotary fastening chucks 12 in a state in which the rectangular water channel 1 is rotatably mounted on the rotary watertight chuck chuck 12. And a rotation power mechanism 14 that rotates about the axis 13.

Here, reference numeral 15 shown in FIG. 1A denotes a servo motor serving as a rotary power mechanism 14, which is controlled by a personal computer 16 to rotate a measurement point positioning index. Reference numerals 17 and 18 designate first and second control drivers, respectively, which are disposed so as to abut on the outer peripheral surface of the water channel square tube 6 of the rectangular water channel 1 and the outer peripheral surface of the upper end plug 2, respectively.
The electronic scale and the second electronic scale are shown. The outputs from the first and second electronic scales 17 and 18 are input to an A / D conversion display 19, and the output is input to the personal computer 16 so that the members of the square water channel 1 are formed. The welding position accuracy measurement inspection can be performed as described later.

Now, as shown in FIG. 1A, the rotary fastening mechanism 12 is actually rotated by the rotary power mechanism 14 via a gear mechanism or a pulley and a belt. Therefore, the rotary bearing holder 11 to which the rotary power mechanism 14 is attached is provided at a position about 200 to 300 mm away from the pipe end of the water channel square pipe 6, and the other rotary bearing holders 11 are each as described above. As described above, the platen 1 near the pipe end of the
0.

Next, the rotary fastening chuck device 12 will be described in detail with reference to FIGS. 1B and 2C and FIGS. 2 and 3.
Is constituted by a square tube chuck ring body 20 through which a chuck square shaft hole 20a which can be fitted is inserted, and a fastening ring 21 having a larger outer shape and through a fastening shaft hole 21a. ing. And the above-mentioned square tube chuck ring 20
As shown in FIG. 2, a plurality of slits 20b for reducing the diameter are used.
Not only is formed, but also on the outer peripheral surface near one end face in the axial direction, a fastening outer peripheral male screw 20c is engraved, and further, a shaft is formed from the terminal side of the fastening outer peripheral male screw 20c. A fastening tapered peripheral surface 20d is provided so as to taper toward the other end surface in the center direction.

Further, as understood from FIG. 1C and FIG. 3, the tightening ring 21 is provided on the inner peripheral surface of the above-mentioned tightening shaft hole 21a near one end face in the axial direction. An inner female screw 21b to be screwed into the outer male screw 20c for tightening of the square tube chuck ring 20 is engraved, and an axial direction from the terminal side of the inner female screw 21b to the other. The inner peripheral female screw 21b is tapered toward the side end surface, and the inner female screw 21b is screwed into the outer male screw 20c for tightening in the square tube chuck ring 20, so that the tightening taper circumferential surface is formed. A tapered peripheral surface 21c for reducing the diameter which presses 20d is formed.

Accordingly, with the water channel square tube 6 of the square water channel 1 as a completed product inserted into the chuck square shaft hole 20a of the square tube chuck ring 20, it is fastened to the square tube chuck ring 20. When the ring 21 is fitted and rotated, the diameter-reducing tapered peripheral surface 21c is slidably in contact with the fastening tapered peripheral surface 20d due to the screwing of the inner peripheral female screw 21b to the fastening outer peripheral male screw 20c, Since this is pressed, the square tube chuck ring 20 is deformed into a reduced diameter state by the provision of the plurality of slits 20b for reducing the diameter, and as a result, the water channel square tube 6 is removed from the square tube chuck ring 20. Will be seized.

Here, the square tube chuck ring 2 disclosed in FIG.
0, the slit 20b provided as described above may be formed in any manner as long as the purpose of reducing the diameter can be achieved.
0b is cut from the inner surface of the chuck angle shaft hole 20a in the radial direction, without reaching the outer peripheral surface, the inner opening slit 20b ₁ which is closed at its inner, conversely, the outer peripheral surface are cut in the radial direction from without reaching the inner surface of the chuck angle shaft hole 20a, so that is provided with an outer opening slit 20b ₂ which is closed at its inner side.

Further, in FIG. 2, the inner peripheral surface of the chuck angular shaft hole 20a is radially opened from the inner surface of the chuck angular shaft hole 20a to the outer peripheral surface, but one end surface 20e in the axial direction (length direction). without to reach the axial direction other end face 20f from discloses also a bilateral opening slit 20b ₃ that to be closed at its inner and disposed by selecting two or more of these slits In the illustrated slit 20b for reducing diameter, an enlarged portion 20g having a circular cross section is formed at the end or the center.

Further, in addition to the above-described structure, the tightening ring 21 according to the third aspect of the present invention shown in FIG. An outer peripheral shoulder 21e on the peripheral female screw 21b side and an outer peripheral shoulder 21f on the tapered peripheral surface 21c for diameter reduction are formed. The outer peripheral shoulders 21e and 21f are designed to be useful when the rotary fastening chuck tool 12 is loaded into the rotary bearing holder 11 described later in detail, so that the rotary fastening chuck tool 12 rotates smoothly without detachment. Further, in FIG. 3, reference numeral 21 g denotes a screw pin hole formed by drilling a desired number in the above-mentioned convex peripheral portion 21 d, and the fastening ring 21 is attached to the square tube chuck ring 20 as described above. If it is necessary to transmit a sufficient rotational force to the screwing operation when trying to screw the screw, a pin (not shown) is fitted into the screw pin hole 21g to perform the operation.

Further, 21h of FIG.
1d shows an outer peripheral screw portion engraved on the outer periphery of the rotary power mechanism 1h.
4 is for transmitting a rotational force to the tightening ring 21 by a gear mechanism (not shown) by the operation of 4.

Next, the rotary bearing holder 11 according to claim 3 is described.
This will be described in detail with reference to FIGS. 1B and 1C. The lower guide 11c fixed to the support 11b of the footrest 11a and formed in an arc shape so as to open upward has an axis and A plurality of pairs of receiving bearing rollers 11e having a rotation axis 11d in a parallel direction are provided. Further, it is fitted to the rotary fastening chuck tool 12 placed on the receiving bearing roller 11e, and is attached to and detached from the connection mounting plate portion 11g of the lower guide 11c using a screw 11f or the like. An upper guide 11h curved in an arc shape with a downward opening so as to be free is configured to be attachable by the connection mounting plate portion 11i.

Further, the upper guide 11h is provided with at least one pair of bearing bearing rollers 11k having a rotation axis 11j in a direction parallel to the axis, so that the screws 11f are fastened. In the state, the pair of receiving bearing rollers 11e and the bearing roller 1
1k are on the fastening ring 21 of the rotary fastening chuck device 12, and the respective outer peripheral shoulder surfaces 21e, 21f
The outer peripheral shoulder surfaces 21e and 21f are opposed to each other via the convex peripheral portion 21d, so that the tightening ring 21 is unintentionally detached from the rotary bearing holder 11. Without this, the rotary fastening chuck tool 12 is in the rotary bearing holding tool 11 and can rotate safely and smoothly.

Therefore, when the member water welding position accuracy measurement inspection of the square water channel 1 is to be performed using the above-described holding and rotating device, as will be understood from FIG. 1 and already explained, The square water channel 1 fitted into the chuck square shaft hole 20a of the square tube chuck ring 20 is
The rotary fastening chuck tool 12 thus gripped by screwing the fastening ring 21 to the square tube chuck ring 20 and thus structured.
Is mounted on the receiving bearing roller 11e of the lower guide 11c of the rotary bearing holder 11, and then the upper guide 11h
And the upper guide 11h is attached to the lower guide 11c.
The rectangular water channel 1 can be rotated by operating the rotary power mechanism 14 by attaching the power supply.

In this case, the procedure for measuring and inspecting the accuracy of the welding position of the member is substantially the same as that in the case of the round water channel described above, and as understood from FIG. 2-electronic scale 17, 1
8 is input to the personal computer 16 via the A / D conversion display 19, and the above-described measurement point data input to the personal computer 16 is L = [(X−x) ² +
According to the formula of (Y-y) ² ] ^1/2 , the arithmetic processing is performed by the personal computer 16 which is programmed in advance, and the quality is quickly determined by the obtained 2L.

[0029]

According to the first aspect of the present invention, the rectangular water channel is screwed to the square tube chuck ring by a fastening ring and the rotary fastening is performed. By simply mounting the clamping ring of the chuck tool on the rotary bearing holder, it can be rotated in exactly the same manner as a conventional round water channel. Therefore, it is not necessary to lift and rotate the square water channel every time a measurement is performed, as in the inspection of the accuracy of welding position of a member using a V-block, and it is necessary to evacuate and restore the measuring instrument for measurement. Disappears,
Not only can the workability be dramatically improved, but there is no reference deviation at the time of measurement, so that both reliability and reproducibility can be achieved.

Further, according to the present invention, two or more slits for reducing the diameter, which are formed in the square tube chuck ring of the rotary fastening chuck device, are selected from an inner opening slit, an outer opening slit and both side opening slits. Since a large number is selected and disposed, it is easy to perform the screwing operation of the tightening ring, and a sufficient diameter reduction result can be obtained.
The water channel square tube fitted into the chuck square shaft hole of the square tube chuck ring can be gripped with sufficient strength, and thus the reliability of the measurement and inspection results can be further improved.

Then, in the case of claim 3, claim 1
In addition to the configuration described above, a lower guide having a bearing roller for receiving the rotary bearing holder, and an upper guide with a mounting bearing roller that can be fixed in a fitted state with the lower guide are provided. The operation of loading the rotary bearing holder so as to be freely rotatable is also facilitated, and the smooth rotation of the rectangular water channel can be maintained. Moreover, a convex peripheral portion is formed on the tightening ring, and the outer peripheral shoulder surface is opposed to the pair of receiving bearing rollers and the mounting bearing rollers. A safe and highly reliable holding and rotating device can be provided without the chuck tool unintentionally falling off the rotary bearing holding tool.

[Brief description of the drawings]

FIG. 1A is an explanatory view of an overall configuration in a case where a member-welding position accuracy measurement inspection of a square water channel is performed using a holding and rotating device according to the present invention, and FIG. 1B shows an assembled state of the device. The side view is shown and (C) is the front view which cut out a part of the device.

FIGS. 2A and 2B show a square tube chuck ring which is a member of a holding and rotating device according to the present invention, wherein FIG. 2A is a front view with a part cut away, and FIG. is there.

FIG. 3 shows a tightening ring which is a member of the above device;
(A) is a front view in which a part is cut away, and (B) is a longitudinal side view in which the part is also cut out.

FIG. 4 is a principle explanatory diagram showing a difference between an axial value of a water channel square tube and an axial value of an upper end plug by an inspection device for measuring welding position accuracy of the same member by the same apparatus.

FIG. 5A is an explanatory view of a known entire configuration in a case where a member-welding position accuracy measurement inspection is performed on a round water channel, and FIG. 5B is a shaft of a water channel round tube corresponding to FIG. It is a principle explanatory view showing a deviation difference between a core value and an axial center value of an upper end plug.

FIG. 6 is a front view schematically showing a longitudinal section of a fuel assembly for a boiling water reactor using a round water channel.

FIG. 7A is a front view of a partially cutout relating to a square water channel, and FIG. 7B is a cross-sectional plan view showing the water channel square tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Square-shaped water channel 6 Water channel square tube 10 Surface plate 11 Rotation bearing holder 11a Footrest 11c Lower guide 11d Rotation shaft center 11e Receiving bearing roller 11h Upper guide 11j Rotation shaft center 11k Mounting bearing roller 12 Rotary fastening chuck Tools 13 Axis of water channel 14 Rotary power mechanism 20 Square tube chuck ring 20a Chuck square hole 20b Slit for diameter reduction 20b ₁ Inside opening slit 20b ₂ Outside opening slit 20b ₃ Both side opening slit 20c Tightening outer male screw 20d Tightening Tapered peripheral surface 20e One end surface in the axial direction 20f End surface on the other side in the axial direction 21 Tightening ring 21a Tightening shaft hole 21b Internal female screw 21c Tapered peripheral surface for reducing diameter 21d Convex peripheral portion 21e External shoulder surface 21f External shoulder surface

Claims (3)

(57) [Claims] A rotary bearing holder mounted and arranged in a desired number on a surface plate; a rotary fastening chuck tool which is fitted to a plurality of desired locations of a rectangular water channel and grips so as to be freely tightened; In a state in which each of these rotary fastening chucks is rotatably mounted on the corresponding rotary bearing holder, respectively, by transmitting a rotational force to the one-turn fastening chuck, A rotary power mechanism for rotating the square water channel about the axis of the water channel square tube is provided.
It consists of a square tube chuck ring body having a chuck square shaft hole in which a water channel square tube can be freely fitted at the axial center, and a tightening ring having a larger outer shape and having a through hole for tightening. In the square tube chuck ring, a number of slits for reducing the diameter are formed, and an outer peripheral male screw is engraved on the outer peripheral surface near one end face in the axial center direction, and the outer peripheral male screw is tightened. A fastening taper peripheral surface is provided so as to taper from the terminal end side of the screw toward the other end surface in the axial direction, and the latter fastening ring is provided with one axial direction in the fastening shaft hole. On the inner peripheral surface near the side end surface, an inner female screw that is screwed to the outer male screw for fastening the square tube chuck ring is engraved, and the other end in the axial direction from the terminal end side of the inner female screw. It is tapered toward the end surface, and the inner female screw is screwed into the outer male screw for fastening. By pressing the peripheral surface of the tightening taper, the diameter of the tubular chuck ring is reduced, and a tapered peripheral surface for reducing the diameter is formed so that the water channel square tube fitted into the chuck shaft hole can be gripped freely. A holding and rotating device for use in measuring and inspecting the accuracy of member welding position of a square water channel in a fuel assembly for a boiling water reactor. 2. An inner opening slit formed by cutting a large number of diameter reducing slits formed in a square tube chuck ring body in a radial direction from an inner surface of a chuck angular shaft hole and being closed on an inner peripheral surface.
An outer opening slit which is cut radially from the outer peripheral surface and is closed inside the inner surface of the chuck angular shaft hole, and is radially opened from the inner surface of the chuck angular shaft hole to the outer peripheral surface, and is opened from one end surface in the axial center direction to the other. 2. The rectangular water channel in the fuel assembly for a boiling water reactor according to claim 1, wherein two or more slits are selected from both side opening slits closed on the inner side of the side end face and disposed. 3. A holding and rotating device used for measuring and inspecting the accuracy of welding position of members. 3. A rotary bearing holder mounted and arranged in a desired number on a surface plate, a rotary fastening chuck tool which is fitted to a plurality of desired locations of a rectangular water channel and gripped so as to be freely fastened. In a state in which each of these rotary fastening chucks is rotatably mounted on the corresponding rotary bearing holder, respectively, by transmitting a rotational force to the one-turn fastening chuck, A rotary power mechanism for rotating the square water channel around the axis of the water channel square tube is provided, and the rotary bearing holder has a lower guide fixed to a footrest, and is provided in a direction parallel to the axis. A plurality of pairs of receiving bearing rollers having a rotation axis are provided, and the receiving bearing rollers are fitted on the rotary fastening chuck tool mounted on the receiving bearing rollers, and are detachably attached to the lower guide. Like An upper guide to be fixed, and at least one pair of mounting bearing rollers having a rotation axis in a direction parallel to the axis in the upper guide are provided,
The rotary fastening chuck device has a square tube chuck ring body having a chuck square shaft hole in which a water channel square tube can be freely fitted at an axial center thereof, and a fastening shaft hole having a larger outer shape than the square tube chuck ring. In the former square tube chuck ring body, a number of slits for diameter reduction are drilled,
An outer peripheral screw for fastening is engraved on the outer peripheral surface near one end face in the axial direction, and is tightened so as to taper from the end side of the outer peripheral screw to the other end face in the axial direction. The tightening ring, which is provided with a tapered circumferential surface, is provided on the inner circumferential surface of the tightening shaft hole near one axial end face of the tightening shaft hole. An inner female screw is screwed into the inner female screw, and the inner female screw is tapered from the terminal end side toward the other end face in the axial direction, and the inner female screw is screwed with respect to the outer male screw for tightening. In some cases, by pressing the tapered peripheral surface for tightening, the diameter of the square tube chuck ring body is reduced, and the tapered peripheral surface for diameter reduction that allows the water channel square tube fitted in the chuck square shaft hole to be gripped freely. Is formed, and furthermore, by forming a convex peripheral portion on the outer peripheral surface of the tightening ring, An outer peripheral shoulder surface which is a female screw side and an outer peripheral shoulder surface which is a taper peripheral surface for diameter reduction are formed, and the pair of receiving bearing rollers and the mounting bearing rollers are respectively provided on both the outer peripheral shoulder surfaces with the convexities. A holding and rotating device used for measuring and inspecting a member welding position accuracy of a square water channel in a fuel assembly for a boiling water reactor, wherein the holding and rotating device is configured to abut over a peripheral portion.