JP2000180577A - Delivery method and device of reactor pressure vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten construction period of reactor pressure vessel 1 replacement and reduce exposure. SOLUTION: At the upper end surface of a reactor pressure vessel 1, stud bolts 21 for attaching hanging metals are planted on both facing sides. The stud bolts 21 are projected upwards through the periphery of upper lid 5. The hanging metals 22 are attached to the stud bolts 21 above the upper lid 5. By connecting the hanging metals 22 and combining two metal plates 28 to form a hanging jig 27 for hanging the reactor pressure vessel 1 for lightening, the total weight for hanging the reactor pressure vessel 1 and a reactor shield wall 7 is lowered to carry out as one body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reactor pressure vessel (R).
The present invention relates to a method and an apparatus for carrying out of a reactor containment vessel (PCV) when replacing a PV), and more particularly to a method and an apparatus for carrying out a reactor pressure vessel together with a top cover and a reactor shield wall. Things.

[0002]

2. Description of the Related Art In carrying out replacement work of a reactor pressure vessel, when the reactor pressure vessel is taken out of the containment vessel, conventionally, the reactor pressure vessel and the upper lid at the upper end thereof are separately provided. I was trying to carry it out.

[0003] That is, the reactor pressure vessel 1 has internal auxiliary equipment such as a shroud 2 and a jet pump 3 and external auxiliary equipment such as a control rod drive mechanism housing (CRD housing) 4 as schematically shown in FIGS. In addition to having the equipment, an upper lid 5 is attached to the upper end, weighs about 950 tons, and is installed inside the reactor shield wall 7 installed in the reactor containment vessel 6. It is like that. 8a, 8b, 8c are holes provided at required height positions of the reactor shield wall 7, 8d is a cutout provided at the top of the reactor shield wall 7, 9 is an upper lattice plate, and 10 is a core support. Plate, 11 is a recirculation inlet nozzle, 12 is a recirculation outlet nozzle, 13 is a water supply nozzle, 14 is a core spray nozzle, 1
5 is a steam outlet nozzle, 16 is a hanging piece of the upper lid 5, 17
Is an upper shield, 18 is a core shield, and 19 is a lower shield. When the reactor pressure vessel 1 is installed inside the reactor shield wall 7, each of the above nozzles has a corresponding hole 8.
a, 8b, 8c and the notch 8d.

Conventionally, when the reactor pressure vessel 1 is to be carried out of the containment vessel 6 during the replacement work of the reactor pressure vessel 1, the upper cover 5 is removed from the reactor pressure vessel 1 and the upper cover 5 is removed. The reactor pressure vessel 1 is separately lifted and carried out. In this case, the upper lid 5 is connected to a hanging piece 17 by a hanging jig, lifted up by a crane or the like, and individually carried out, and then each of the nozzles 11, 12, 13, 1
After the pipes connected to 4, 4 and the like have been removed, as shown in FIG. 5, the upper part, the core part, and the lower part of the reactor pressure vessel 1 are covered with an upper shield 17, a core shield 18, and a lower shield. In a state shielded by the body 19, the suspension jig 20 is then connected to the upper end of the reactor pressure vessel 1 and the upper shield 17,
Hanging jig 2 with a crane or the like while leaving reactor shield wall 7
0, only the reactor pressure vessel 1 is shielded by the shields 17, 18,
A method of lifting and carrying out a reactor pressure vessel while shielding it at 19, while, when loading a new reactor pressure vessel, hanging it down by a crane or the like according to the above procedure and mounting it inside the reactor shielding wall 7 (Japanese Patent Laid-Open No. 9-1)
No. 45882).

[0005]

However, in the above-mentioned conventional method, the upper lid 5 and the reactor pressure vessel 1 are separated and lifted and carried out separately. It suffices if it has enough strength to lift the top lid 5 and the reactor pressure vessel 1 alone, and the weight of the suspending jig itself is a certain weight when viewed from the weight of the reactor pressure vessel 1 alone. However, since the total weight does not increase, a heavy structure can be used. On the other hand, the hanging pieces attached to the upper lid 5 and the reactor pressure vessel 1 also have the upper lid 5.
And the reactor pressure vessel 1 may be able to withstand the weight of the reactor vessel 1, but as described above, the upper lid 5 and the reactor pressure vessel 1 are separately lifted and carried out, and these are lifted and carried out together. And the reactor shield wall 7
Since the reactor pressure vessel 1 is carried out without being removed, it takes a lot of time to replace the reactor pressure vessel, and in order to reduce exposure, the upper shield 17 and the core shield Since the body 18 and the lower shield 19 were separately prepared and attached, much time and labor was required for replacing the reactor pressure vessel.

[0006] In order to shorten the period of replacing the reactor pressure vessel and greatly reduce the exposure, the inventors of the present invention have proposed that the upper cover 5 be removed when the reactor pressure vessel is replaced.
Together with the reactor pressure vessel 1 and the reactor shield wall 7
As a result of devising and studying about carrying out the same, the hanging jig and the hanging piece used in the conventional method cannot integrally lift the top cover 5, the reactor pressure vessel 1, and the reactor shielding wall 7. The present inventors have found that it is possible to lift the reactor pressure vessel and the reactor shield wall integrally by using special hanging jigs and hanging ear fittings, and made the present invention.

Accordingly, it is an object of the present invention to provide a method and apparatus for unloading a reactor pressure vessel which can significantly shorten the period for replacing the reactor pressure vessel and reduce exposure. .

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention removes a reactor shield wall disposed around a reactor pressure vessel when the reactor pressure vessel is installed from a reactor containment vessel, The reactor pressure vessel is lifted together with the top lid, and simultaneously the reactor shield wall is lifted and carried out as a unit. The stud bolts of the book are fixed upright, and hanging ear fittings are attached to the upper side of the upper lid which is passed through the stud bolts and adhered to the reactor pressure vessel using the upper end of the stud bolts, Further, a hanging jig that is connected to the hanging ear fitting to lift the reactor pressure vessel is made of a strong metal plate with a light weight, and the hanging jig is connected to the hanging ear fitting. It has a reactor pressure vessel so as to discharge the reactor shield wall and integrally lifting with an upper lid and unloading apparatus of the reactor pressure vessel, characterized in. In addition, the hanging jig is integrally formed by arranging two metal plates back and forth, and a hook hook for hooking a hook of a crane is fixed at a central portion, and furthermore, a hanging arm connected to hanging ear fittings at both ends. The configuration is provided with.

[0009] Since the reactor pressure vessel is lifted together with the upper lid and taken out integrally with the reactor shield wall, the construction period of the reactor pressure vessel replacement work can be greatly shortened, and the reactor shield wall reduces exposure. Can be achieved.

[0010] Since the suspension jig is made to be lightweight by combining two metal plates, the suspension jig is added to the weight when the reactor pressure vessel and the reactor shield wall are integrally suspended. Since the weight of the tool is light, an increase in the total weight can be suppressed, whereby the reactor pressure vessel and the reactor shield wall can be integrally suspended and carried out.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (a) (b) (c) (d), FIG. 2
(A) (b) and FIG. 3 show an embodiment of the present invention, in which the reactor pressure vessel 1 is unloaded when the reactor pressure vessel 1 is carried out for replacement work. Without lifting off the top lid 5 and lifting it off integrally with the reactor shield wall 7, it is possible to shorten the construction period and reduce the exposure.

More specifically, similarly to the reactor pressure vessel 1 shown in FIG. 4, it has internal auxiliary equipment such as a shroud 2 and a jet pump 3 and external auxiliary equipment such as a control rod drive mechanism housing 5. The reactor pressure vessel 1
In order to be able to lift the reactor pressure vessel 1 together with the reactor shield wall 7, a plurality of reactors (four at one location in the drawing) are provided at two opposing upper end surfaces of the reactor pressure vessel 1 (positions on both right and left sides). ) Are stood upright and fixed, and the upper end of the four stud bolts 21 on one side is used to withstand the weight (more than 1200 tons) of the reactor pressure vessel 1 and the reactor shield wall 7. The hanging ear fittings 22 are attached so as to have the obtained strength, and a strong and lightweight hanging jig 27 is formed to suppress an increase in the total weight and to prevent the reactor pressure vessel 1 from being shielded from the reactor. The wall 7 can be unified.

The hanging ear fittings 22 are provided on the upper surface of a support plate 23 having a required length and width having holes for inserting the stud bolts 21 in the vertical direction in accordance with the number of the stud bolts 21. Two ear plates 24 each having a hole 25 for inserting a pin are arranged at required intervals, and each ear plate 2
4 is fixed to the upper surface of the support plate 23 by welding, and the nut 26 is screwed into the upper end of the stud bolt 21 by passing each stud bolt 21 into each hole of the support plate 23. 21 so that it does not come off.

The suspension jig 27 which is connected to the suspension lug 22 to suspend and carry out the reactor pressure vessel 1 integrally with the reactor shield wall 7 includes the reactor pressure vessel 1 and the reactor shield wall 7. It has a structure that has strength enough to withstand the weight of the above and is lightweight. In other words, the upper and lower stud bolts 21 at the upper end of the reactor pressure vessel 1 are arranged so as to be slightly longer than the facing intervals of the stud bolts 21 and to have a slightly higher central portion so as to overlap in the front-rear direction at a required interval. Sheet of metal plate 28
In the meantime, a reinforcing member 30 is interposed and integrated, and a metal closing plate 29 is welded to the periphery except for a part of the lower surface of both ends to be reinforced, and a frame body reinforced with a rib 31 is made.
At the center of the upper part of the frame, two hooks 32 are attached in parallel, and a hook hook 34 which can hook the hook 33 of the crane on the pin 32 is fixed, thereby providing a strong suspension. A balance 35 is formed, and upper ends of suspension arms 36 inserted from below through open portions of lower surfaces of both ends of the suspension balance 35 are rotatably attached to the suspension balance 35 with pins 37, respectively. The lower end of 36 is connected to the hanging lug 22.

Further, as shown in FIG. 3, the reactor shield wall 7 has a recirculation inlet nozzle 11 at a lower position.
And a plurality of holes 8b corresponding to the recirculation outlet nozzle 12 are provided at substantially the same level in the circumferential direction, and a plurality of holes 8c corresponding to the core spray nozzle 14 are provided at an upper position. The notch 8d corresponding to the water supply nozzle 13 is provided at substantially the same level in the circumferential direction, and can be carried out integrally with the reactor pressure vessel 1,
The level position where the large number of holes 8a and 8b are located is a cutting position C
As L, the cutting position CL is cut in the circumferential direction so that the reactor shield wall 7 can be separated vertically and carried out.

A hole for penetrating the stud bolt 21 is formed in a peripheral portion of the upper lid 5 so that the upper lid 5 is attached to the reactor pressure vessel 1 through the stud bolt 21.

Reference numeral 38 denotes a pin for connecting the suspension arm 36 of the suspension jig 27 to the suspension lug 22, and reference numeral 39 denotes a portion extending from the upper end of the reactor pressure vessel 1 to the reactor shielding wall 7 and the control rod drive mechanism housing 5. Sheets arranged to cover the whole, 4
Reference numeral 0 denotes a connecting member between the reactor pressure vessel 1 and the reactor shield wall 7.

When the reactor pressure vessel 1 is to be lifted and carried out during the replacement work of the reactor pressure vessel 1, when the reactor pressure vessel 1 is lifted and carried out, the upper cover 5 is not detached but remains attached to the reactor pressure vessel 1, The shielding wall 7 is cut at the cutting position CL shown in FIG. 3 to be separated vertically and removed from the containment vessel. Next, the hook 33 of the crane is hooked on the hook hooking portion 34 of the hanging jig 27, the hanging jig 27 is carried into the reactor containment vessel, and the hanging balance 3 constituting the hanging jig 27 is loaded.
5 Connect the lower ends of the suspension arms 36 at both ends to the reactor pressure vessel 1
It is connected to the hanging ear fitting 22 at the upper end by a pin 38. Thereafter, the reactor pressure vessel 1 is lifted together with the upper lid 5 and the reactor shield wall 7 by a crane via the lifting jig 27. At this time, the hanging ear fitting 22 has a large weight (120) when the reactor pressure vessel 1 and the reactor shield wall 7 are integrally suspended.
In order to withstand the strength, the four stud bolts 21 on one side planted in the reactor pressure vessel 1 are mounted on the stud bolts 21 so that the suspension jig 22 has sufficient strength. The suspended balance 35 made of two metal plates 2
8, the weight of the suspending jig 27 is lighter than that of the conventional suspending jig 20, because it is constituted by the metal closing plate 29, the reinforcing member 30 and the like so as to be as light as possible. The total weight can be reduced.

When the upper lid 5 and the reactor pressure vessel 1 are lifted together and the reactor shield wall 7 is also lifted as a unit, the area around the reactor pressure vessel 1 is shielded by the reactor shield wall 7. By reducing the exposure and carrying the reactor pressure vessel out of the containment vessel as it is, the top cover 5 and the reactor pressure vessel 1 can be simultaneously carried out, greatly shortening the construction period of the reactor pressure vessel replacement work. You can do it.

Incidentally, the hanging jig 27 may have a structure other than that shown in the drawings as long as it has strength and weight.
In addition, although the case of the two-point hanging structure is shown in which the hanging ear fittings 22 are provided at two places, the hanging jigs 27 may be provided in three places at equal intervals and the hanging jig 27 may be formed in a triangular shape to form a three-point hanging structure. Of course, various changes can be made without departing from the spirit of the present invention.

[0022]

As described above, according to the method and apparatus for unloading a reactor pressure vessel of the present invention, a plurality of stud bolts implanted in at least two places at the upper end of the reactor pressure vessel are used. A hanging ear fitting is firmly attached above the upper lid, and a hanging jig connected to the hanging ear fitting is made of a strong metal plate to reduce the weight to form a hanging balance. Together with the reactor shield wall and carry it out, so that the work time for carrying out can be reduced as compared with the case where the reactor pressure vessel and the top lid are carried out separately and carried out. Since the reactor shield wall is removed and carried out integrally with the reactor pressure vessel, it is possible to eliminate the need to attach a shield wall to the outer periphery of the reactor pressure vessel separately to reduce exposure, and then carry out the vessel. Short construction period In addition, since the reactor shield wall is removed and taken out together, the exposure can be reduced, and the hanging jig is lightened by combining two metal plates. Due to the configuration, excellent effects can be achieved such that the total weight can be reduced by reducing the weight of the suspending jig added to the weight when the reactor pressure vessel and the reactor shield wall are integrally suspended. .

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for unloading a reactor pressure vessel according to the present invention, in which (a) is a partially cut side view showing a state before the reactor pressure vessel is lifted, and (b) is a lifted state. FIG. 3C is a schematic view showing the state, FIG. 3C is a view from arrow A in FIG. 3B, and FIG. 4D is a view from arrow B in FIG.

FIGS. 2A and 2B show hanging ear fittings attached to an upper end surface of a reactor pressure vessel, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is an expanded view of a reactor shield wall.

FIG. 4 is a cut-away side view schematically showing a reactor pressure vessel.

FIG. 5 is a diagram showing a procedure for unloading a conventional reactor pressure vessel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor pressure vessel 5 Top lid 7 Reactor shielding wall 21 Stud bolt 22 Hanging ear hardware 26 Nut 27 Hanging jig 28 Metal plate 35 Hanging balance 36 Hanging arm

Claims (3)

[Claims] 1. A reactor shield wall disposed around a reactor pressure vessel when the reactor pressure vessel is installed is removed from a reactor containment vessel, and the reactor pressure vessel is lifted together with an upper cover, and at the same time, the reactor shield is removed. A method for unloading a reactor pressure vessel, wherein the wall is lifted as a unit and unloaded. 2. At least two of the upper end of the reactor pressure vessel
A plurality of stud bolts are fixed upright at the location, and a suspension lug is used on the upper side of the upper lid, which is passed through the stud bolts and attached to the reactor pressure vessel, using the upper end of the stud bolts. A hanging jig, which is attached to the hanging ear fitting and lifts the reactor pressure vessel by being connected to the hanging ear fitting, is made of a strong metal plate with a light weight, and the hanging jig is connected to the hanging ear fitting. A reactor pressure vessel is lifted together with an upper lid to carry out the reactor pressure vessel integrally with the reactor shielding wall. 3. A hanging jig is integrally formed by arranging two metal plates back and forth, and a hook hooking portion for hooking a crane hook is fixed at a central portion, and further connected to hanging ear fittings at both ends. 3. The unloading device for a reactor pressure vessel according to claim 2, wherein the unloading device has a suspension arm.