JPS604887A - Method of installing sealing bellows unit in containment vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a seal bellows unit in a nuclear reactor containment vessel.

As shown in Fig. 1, the reactor containment vessel is constructed of a containment vessel 1 whose upper half is cylindrical with a bottom and whose upper half is conical. A dry well section 4 for accommodating the reactor pressure vessel 3 in
It is known to have a suppression chamber section 5, which is a pressure suppression chamber, formed at the bottom thereof. Further, between the containment vessel l and the diamond 7 ram 70a2, there is a seal bellows unit 6 that seals between the dry well part 4 and the suppression chamber part 5 while absorbing the difference in the heat resistance between the two. is provided.

This seal bellows unit 6 has a diameter of 72 mm, 7 lower 2
A seal bellows is provided between an annular upper plate and a lower plate along the peripheral edge of the ring.

By the way, conventionally, such a seal bellows unit 6
When installing the containment vessel l, the upper part of the containment vessel l is left intact, the diaphragm 70a2 is fabricated, and the seal bellows unit 6 is then divided in the circumferential direction and each piece is inserted from the same opening at the upper part of the containment vessel l. Then, each piece is connected to each other in the circumferential direction within the containment vessel l, and the upper plate of these heaths is attached to the lower inner wall of the upper half of the containment vessel l, and the lower plate is attached to the diamond 7 ram floor 2, respectively. A method of fixing by welding is used. However, in the conventional method of installing such a seal bellows unit, the seal bellows unit 6 is manufactured and installed inside the containment vessel 1 after most of the containment vessel 1 has been manufactured, which results in a long construction period. There were drawbacks.

Also, connect each piece of the cool bellows unit 6 to each other.
The disadvantage is that the work of making the 15 connections must be done inside the containment vessel l, which is very troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for installing a seal bellows unit in a nuclear reactor containment vessel, which can shorten the construction period and also allow the seal bellows unit to be easily manufactured. purpose.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, for convenience of explanation, the method of the present invention will be described with reference to the drawings.
The lifting jig used when lifting the Z Sirs unit with a crane or the like will be explained with reference to FIGS. 2 to 6.

In the figure, 21 indicates a lifting jig. 22 is the frame,
It is made up of H-beams connected in a ring shape, and is reinforced by lips 23 provided at intervals in the circumferential direction. A plurality of hanging fittings 24 are attached to the upper side of the frame 22 at intervals in the circumferential direction with T6 connections. Furthermore, an H-shaped steel 25 is attached to a portion of the lower side of the frame 22 corresponding to the hanging fitting 24 using an angle 26, a bolt 27, etc., and is lowered. An L-shaped receiving pedestal 28 is attached to the outside of the lower part of the H-shaped steel 25 using a connecting member 29, bolts 30, etc., and is lifted by a crane or the like and a lifting jig 21 is installed as described below. When moving the H-beam 25 above the lower half of the containment vessel l, if the H-beam 25 cannot be moved because it comes into contact with equipment, scaffolding, etc. installed at that position, H in the corresponding place
Instead of providing the shaped steel 25 and the receiving pedestal 28, a simple flat plate-like receiving pedestal 31 may be supported by the seven frames 22 via wires (not shown), as shown in FIG. . In addition, 32 in FIG. 6 is the said equipment or scaffolding. Support pieces 33 having holes are attached to predetermined positions inside the bases 28 and 31 by welding, respectively.

6 is a seal bellows unit, as shown in FIGS. 7 to 9, an upper plate (seal ring) 36 and a lower plate (base plate) 37 are formed in an annular shape along the periphery of the diamond 72m 70A2. Metal seal bellows 38 and 39 having a substantially Ω-shaped cross section are provided concentrically at 2M between the two. Furthermore, a female screw stud 40 is provided on the lower surface of the lower plate 37, as shown in FIGS. 3, 5, and 6, respectively. Further, the seal bellows unit 6 is attached with a maintenance cover and a temporary protection cover (each not shown).

Therefore, when installing the seal bellows unit 6 and manufacturing the containment vessel l, first fabricate the suppression chamber part which is the lower half of the containment vessel l and the beam 41 which is the framework of the diamond 7 ram floor. Seal bellows unit 6 on site in parallel with work
Manufacture.

Then, as shown in FIG. 2, place the seal bellows unit 6 on the pedestal 28.31, and then as shown in FIGS. 3, 5, and 6, the female screw of the seal bellows unit 6 is Washer 42 on stud 40
The seal bellows unit 6 is fixed to the receiving base 28.31 by screwing in the bolt 43 through the bolt 43.

Next, the lifting jig 21 on which the seal bellows unit 6 is mounted is hung by hooking a crane hook (not shown) or the like onto the lifting jig 24, and then the diamond 7 ram 70 is lifted up as shown in FIG. It is placed on beam 41, which is the framework of A.
After that, bolts 30 and connecting members 29 are removed, and frame 22 and H-beam 25 are removed from receiving pedestals 28.31 using the crane.

Next, as shown in Figure 8, the side plate 44 of the dry well section is attached to the upper part of the suppression chamber section of the containment vessel I by welding. Further, a block-like mounting member 45 having a cross-sectional shape is attached to a predetermined location on the inner wall of the side plate 44 by welding.

Note that the mounting member 45 may be attached to the side plate 44 in advance.

Next, as shown in Figure S9, the operating part (not shown) of a chain block or jack is placed on a cradle i28.3.
Is it aligned with the support piece 33 of 1? Then, the upper plate 36 of the seal bellows unit 6 is attached to the hanging portion of the mounting member 45 by contacting with the bath. After this, the bolt 43 and washer 42 are removed, and the pedestal 11i28.31 is removed from the seal bellows unit 6, and a male threaded stud (not shown) is erected on the beam 41, and this male threaded stud is It is screwed into the female threaded stud 40 of the seal bellows unit 6, and the lower plate 37 is welded to the formwork 46, thereby supporting the seal bellows unit 6. Next, concrete 47 is poured into the formwork 46 and the diamond 72m floor 2 is constructed. After this, the installation of the seal bellows unit 6 is completed.

As explained above, according to the method for installing a seal bellows unit in a reactor containment vessel according to the present invention, the suppression chamber part of the reactor containment vessel is manufactured, and in parallel with this, the seal bellows unit is manufactured on site. Then, using a crane or the like, lift the seal bellows unit as a single unit and place it on the beam passing through the framework of the diaphragm floor. Next, fabricate the lower part of the dry well part of the reactor containment vessel, and then lift the seal bellows unit. and fix the upper plate of the seal bellows unit to the lower inner wall of the dry well part of the reactor containment 'B',
Next, concrete was poured between the lower plate of the seal bellows unit and the beam to construct the Dia7 ram floor, so the seal bellows unit was manufactured in parallel with the fabrication of the subregion chamber of the reactor containment vessel. Therefore, the construction period can be shortened, and since the seal bellows unit can be manufactured on-site near the Dia7 ram floor instead of on the Dia 7 ram floor, the seal bellows unit can be manufactured easily. It has the effect of a hat.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the reactor containment vessel, kc
FIG. 2 is a plan view showing an example of a seal bellows unit lifting jig used in the method of the present invention, and FIG.
-A sectional view along the lit line, No. 4 is the l■ arrow diagram of Fig. 3, Fig. 5 is a side view of the - pedestal, Fig. 6 is a side view of the other eight receiver seats, No. 7 9 through 9 are diagrams each shown for explaining the installation process 11 of the seal bellows unit. 1...Containment vessel, 2...Diamond 72m floor, 6.
... Seal bellows unit, 21 ... Lifting jig,
28.31...Base is pedestal, 36...Upper plate (seal ring), 37...Lower plate (base plate), 38.3
9... Seal bellows, 41... Beam, 44...
・fill &, 47... concrete. Output r + people Ishikawajima Harima Heavy Industries Co., Ltd. ('l +'' Figure 2

Claims (1)

[Claims] A seal bellows unit, in which a seal bellows is provided between an annular upper plate and a lower plate, is installed between the lower inner wall of the dry well section of the reactor containment vessel and the Dia7 ram floor provided at the upper part of the suppression chamber section. In the installation method, the suppression chamber section of the reactor containment vessel is manufactured, and in parallel with this, the seal bellows unit is manufactured on site, and then the seal bellows unit is lifted using a crane or the like and the diamond 7
The frame of the ram floor is placed on the round beam, and then the lower part of the dry well part of the reactor containment vessel is fabricated, and then the seal bellows unit is lifted and the upper plate of the seal bellows unit is placed in the dry well part of the reactor containment vessel. A seal in a reactor containment vessel, characterized in that it is welded and fixed to a lower inner wall of a well portion, and then concrete is poured between the lower plate of the seal bellows unit and the beam to form a diaphragm floor. How to install the bellows unit.