JPS62896A - reactor 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 [Field of Industrial Application] The present invention relates to a reactor containment vessel that takes into account workability during the loading and unloading of equipment such as the upper mechanism of a main steam isolation valve in a main steam piping system.

"Prior Art" Various engineering safety facilities are installed in the reactor containment vessel in a nuclear power plant. In the example of the reactor containment vessel of a boiling water type light water reactor shown in Fig. 3, this through MLJSW 1 made in Japan is connected to the A main steam isolation valve 6 is installed in the main steam piping tunnel 5 to lead the main steam piping to the main steam pipe. Steam is shut off to prevent main steam from leaking directly to the outside. Further, the main steam isolation valve 6 is reassembled after disassembling the valve body and inspecting each function during regular inspections of the nuclear power plant. For this reason, the reactor containment vessel, for example, as shown in FIG.
Detour equipment transport path 1 for transporting the main steam isolation valve disassembly and assembly equipment R7 previously proposed in No. 920, and the upper mechanism 8 taken out from the valve box during disassembly to the intended location.
4. An equipment drawer hatch 15 etc. that penetrates the side wall of the reactor containment vessel is installed.

The inspection work for the main steam isolation valve 6 will be explained based on FIG. A schedule is adopted for dismantling the main steam isolation valve 6 located inside. That is, the main steam isolation valve 6 is disassembled by the disassembly and assembling device t7 shown in FIG. The equipment is transported along the circumferential direction, pulled out from the equipment drawer hatch 15 to the outside of the reactor containment vessel as shown by the arrow (c), and further transported to the main steam isolation valve wrapping room for necessary inspection, etc. will be implemented. Next, the upper mechanism 8 located inside the main steam piping tunnel 5 is pulled out of the main steam piping tunnel 5 through the linear outer conveyance path 9 passing through the tunnel side wall 13. Then, it is transported to the wrapping room for the main steam isolation valve, and the same inspection is carried out.

"Problems to be Solved by the Invention" However, when transporting such a main steam isolation valve, the following problems occur.

■Equipment unloader hatches are used for transporting the main steam isolation valve as well as for loading and unloading many other pieces of equipment, so it is necessary to coordinate schedules with loading and unloading of other equipment, and mutual interference is likely to occur.

■The conveyance path of the main steam isolation valve and the floor level of the equipment dispenser hatch do not necessarily match, and it is necessary to prepare a temporary beam truck, etc. to adjust the level before and after the equipment dispenser hatch.

(2) Due to the difference in floor level, it is necessary to rehang the equipment before and after the equipment drawer hatch using, for example, a jib crane type mortar.

■Since a device drawer hatch is used that is shared with other devices, the main steam isolation valve conveyance path is detoured, resulting in a decrease in work efficiency.

■When transporting the main steam isolation valve upper mechanism to the main steam isolation valve wrapping room, two routes are required: one from the inside of the reactor containment vessel and the other from the main steam isolation valve tunnel.

The present invention effectively solves these problems, and also
The purpose of the present invention is to provide a reactor containment vessel that can improve the efficiency of inspecting main steam isolation valves and other equipment during periodic inspections and reduce radiation exposure of workers.

``Means for Solving the Problems j'' In order to achieve such an object, the present invention provides a main steam isolation valve in each of the dry well and the main steam piping tunnel, and also provides a connection between the dry well and the main steam piping tunnel. By providing an equipment transport hatch that forms a short-circuit transport path on the side wall of the vessel that separates it from the steam piping tunnel, the upper mechanism disassembled inside the reactor containment vessel can be guided to the main steam piping tunnel. , through a common conveyance path with the upper mechanism of that part, it is connected to the intended wrapping chamber or the like over the shortest distance.

"Example" Hereinafter, an example of the reactor containment vessel of the present invention will be described based on FIGS. 1 and 2.

Also in this embodiment, as shown in FIGS. 1 and 2, the main steam pipe 3, which is laid from the reactor pressure vessel l through the dry well 2, penetrates the vessel side wall 4. A total of eight main steam isolation valves 6, four each, are installed at points leading to the main steam piping tunnel 5 and connected to an external turbine room, etc., and at positions close to the inside and outside of the vessel side wall 4. The point is that the disassembly and assembly device 7 is installed near the main steam isolation valve 6, and the upper mechanism 8 of the main steam isolation valve 6 in the main steam piping tunnel 5 is transported to the main steam isolation valve wrapping room. Although it is similar to the conventional reactor containment vessel examples shown in Figures 3 and 4 in that it is provided with an outer conveyance path 9 for transport, it differs greatly in the following points. be.

That is, the inner conveying path 10 for conveying the upper mechanism 8 of the main steam isolation valve 6 is straight and short as shown in FIG. The part along the circumference inside the reactor containment vessel is omitted, and
On the container side wall 4 between the inner conveyance path 10 and the outer conveyance path 9,
It has a structure in which a hatch 11 for transporting equipment is provided, and a linear short-circuit transport path 12 passing through the hatch 11 for transporting equipment is formed. Furthermore, as shown in FIG. 2, the heights of the inner and outer main steam isolation valves 6 are usually at the same level, so the short-circuit conveyance path 12 connects their side positions horizontally and orthogonally. . In addition, the code|symbol 13 in the figure is a tunnel side wall.

If the reactor containment vessel is configured in this way, the equipment transport hatch II must be closed during reactor operation to ensure airtightness between the dry well 2 and the main steam piping tunnel 5. Of course, during periodic inspections after the start of reactor operation, hatches for transporting equipment must be used! By opening the main steam isolation valve 6, workers can enter and exit the main steam isolation valve from this part.
The upper mechanism 8 can be carried in and out freely.

In this case, the schedule is to first dismantle the main steam isolation valve 6 located inside the vessel side wall 4, and then dismantle the main steam isolation valve 6 located in the main steam piping tunnel 5. Even if adopted, the disassembly and inspection work of the main steam isolation valve 6 will not cause mutual interference with other equipment. That is, the main steam isolation valve 6 located on the inside is disassembled by the disassembly and assembly device 7 shown in FIG. After shifting, use the hatch for transporting equipment! Short-circuit conveyance path I2 via 1
Then, it joins the outer conveyance path 9 as shown by the arrow (B), and is further conveyed to the wrapping chamber for the main steam isolation valve, where necessary inspections and the like are carried out.

Therefore, the transport distance of the upper mechanism 8 inside the reactor containment vessel is a short distance from the side of the main steam isolation valve 6 in parallel to the main steam pipe 3, and other equipment inside the reactor containment vessel is moved. This can be carried out independently from inspection work, etc. Furthermore, since the main steam isolation valve 6 is transferred between the sides of the main steam isolation valve 6 and the upper mechanism 8 located inside the main steam piping tunnel 5, interference with other parts may occur. can be reduced.

"Effects of the Invention" As explained above, the reactor containment vessel of the present invention is provided with a hatch for transporting equipment on the side wall of the container that partitions the dry well and the main steam piping tunnel to form a short-circuit transport path. As a result, the following excellent effects can be achieved.

(a) The conveyance path of the upper mechanism of the main steam isolation valve inside and outside the vessel side wall is connected by the shortest distance, and the conveyance path of the upper mechanism of the main steam isolation valve inside the reactor containment vessel is near the side of the main steam isolation valve. There is no possibility of mutual interference with the loading and unloading of other equipment.

(b) If the height levels of the inner and outer main steam isolation valves are the same, there will be no difference in level between the inner and outer side walls of the container, and the structure of the truck etc. will be simplified.

(c) It becomes easy to make the equipment transport path a straight line or a combination of straight lines, and the transport path and its auxiliary equipment can be simplified.

(d) Since the conveyance path of the main steam isolation valve does not detour through the reactor containment vessel, work efficiency is less likely to be degraded due to mutual interference between inspection operations.

(e) Since the inner and outer conveyance paths are connected by a short-circuit conveyance path,
The transportation route can be simplified.

(f) Since the dry well and the main steam piping tunnel have similar boundaries that accommodate the main steam piping, it is possible to simplify the structure of the hatch for transporting equipment that penetrates and closes the side wall of the container. can.

(g) Due to the remarkable improvement in work efficiency, there is no radiation risk for workers.
! I＾kc-su、邊-nepψshi上I-sepu

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the reactor containment vessel of the present invention. Figure 1 is a partially omitted plan view, Figure 2 is a partially sectional front view, and Figure 3 is a partially cutaway front view. The figure is a partially omitted plan view showing a conventional example of a nuclear reactor containment vessel, and FIG. 4 is a perspective view showing an example of a main steam isolation valve disassembly and assembly device. 1... Reactor pressure vessel, 2... Drywell, 3... Main steam piping, 4... Vessel side wall, 5... Main steam piping tunnel, 6...
...Main steam isolation valve, 7...Disassembly and assembly equipment,
8... Upper mechanism, 9... Outer conveyance path,
IO...Inner conveyance path, 11...Equipment conveyance hatch, 12...Short-circuit conveyance path, I3...
...Tunnel side wall.

Claims (1)

[Claims] A main steam isolation valve is provided in each of the dry well and the main steam piping tunnel, and an equipment transport hatch forms a short-circuit transport path on the side wall of the container that partitions the dry well and the main steam piping tunnel. A nuclear reactor containment vessel characterized by being provided with.