JPH01142500A - Travelling type valve carry-in/out apparatus - Google Patents

Abstract

PURPOSE:To facilitate disassembly and carry-out work of a valve, by a method wherein a monorail is mounted between an upper part of a valve for a main steam pipe and an upper part of a port for carrying in or out equipment and a rail is supported perpendicular thereto to provide a electric chain block on the rail. CONSTITUTION:Three monorails 20 are arranged horizontally between an upper part of a valve 6 for a main steam pipe and an upper part of an port for carrying in or out equipment. Wheels 8 are mounted movably on the monorails 20 and the center shaft of the wheels 8 is mounted on a wheel support frame 9. A rail support 11 is suspended on the wheel support frame 9 perpendicular to the monorail 20 and is movable along the monorail 20. The wheel 8 at the center is driven with a drive motor 10. A rail 13 is fastened at the bottom of the rail support 11 in the same direction as that of the rail support 11. Two electric chain blocks 4 having a hook 15 are provided on the rail 13.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a reactor containment vessel (hereinafter referred to as PCv) of a nuclear power plant.
Main steam relief safety valve (hereinafter referred to as SRV) or main steam isolation valve (hereinafter referred to as MS) installed in the main steam pipe in
(referred to as IV) and take it out of the PCv, or
This invention relates to a traveling type valve unloader device that is carried into a v-in and assembled.

(Prior art) In a nuclear power plant, a reactor pressure vessel is housed in a PCv, and steam generated in the reactor pressure vessel is sent to a steam turbine via a main steam pipe. Drive and get to work. For this reason,
The main steam pipe extends from the reactor pressure vessel through the PCv and is connected to the steam turbine. Additionally, an MSIV is installed in the main steam pipe inside the PCv in order to prevent the release of steam generated in the reactor pressure vessel to the outside of the PCv and to prevent the release of radioactive materials into the environment. Furthermore, in order to prevent overpressure within the reactor pressure vessel, an SRV is provided in the main steam pipe within the PCv.

In view of the importance of their functions, MSIVs and SRVs are periodically subjected to various tests, disassembly and inspections, etc.

Normally, this overhaul and inspection etc. are carried out outside the PCV because it is necessary to prevent exposure to radiation during work and improve workability and reliability.

At that time, the disassembly of the MSIV and SRV and the carrying out of the PCV are carried out as follows.

First, we will discuss the disassembly and transport work of MSIV.

To disassemble the MSIV, a first chain block is installed directly above the MSIV, and a second chain block is installed at an angle of 45 degrees to the main steam pipe in the axial direction of the MSIV. Next, the first chain block and the second chain block are connected to the MSIV
MSIV is disassembled by attaching it to the upper mechanism of the MSIV and making both chain blocks work together.

The cooperative work of the 1st and 2000th enblocks gradually hoisted both chain blocks and moved the upper mechanism of the MSIV to the MSIV.
This is done by pulling it out from the main body.

After this extraction, the upper mechanism of the MSIV is resuspended using a chain block attached to a monorail installed directly above the MSIV, and moved along the monorail to the outside of the PCV.

After the disassembly and inspection work, the work of attaching the upper mechanism of the MSIV to the main body of the MSIV is performed in the reverse procedure of the work of disassembling the upper mechanism of the MSIV described above.

Next, the disassembly and transport work of the SRV will be described.

The 1,000th enblock placed above the SRV is hung on the top of the SRV attached to the main steam pipe and lifted. Next, a second chain block is placed on the bottom of the SRV, and the SRV is turned sideways. Next, the SRV is resuspended using a chain block attached to the monorail, and is carried outside the PCV along the monorail for disassembly and inspection. The work of installing the SRV after the disassembly and inspection work is performed in the reverse order of the above-mentioned disassembly and transporting work of the SRV.

(Problems to be Solved by the Invention) As described above, conventionally, the work of disassembling an SRV or MSIV has been carried out by using a plurality of chain blocks and making them work together. Also SRV or MSI
To transport the V out of the PCV, suspend the SRV or MSIV on a chain block attached to the monorail.
This is being done by moving it along the monorail to outside the PCV.

However, the disassembly work of cooperating a plurality of chain blocks and the work of resuspending the monorail to the chain blocks require skill in the mutually related operations and require many working days.

Furthermore, MSIV generally has 4 units in PCV, and SRV has 4 units in PCV.
There are 6 to 18 units installed in the CV, but since the PCV is not very spacious, if a temporary chain block is used for answering, there is a problem that the workability is poor and the danger is high.

The present invention has been made in consideration of these points,
It is an object of the present invention to provide a traveling type valve unloading device inside a PCV that can easily disassemble, assemble, and carry in and out of (7) MS IV and SRV inside a PCV, and can significantly improve reliability, safety, and certainty. purpose.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a monorail that extends horizontally between the upper part of the main steam pipe valve in the reactor containment vessel and the upper part of the equipment loading/unloading entrance.
a movably suspended rail support with a drive motor; a rail supported by the rail support at right angles to the monorail; an electric chain block movably disposed along the rail; This is a traveling valve unloading device characterized by comprising a rail support and a control device for controlling a drive mechanism of the electric chain block.

(Operation) The control device places an electric chain block above the main steam pipe valve, lifts the valve using the electric chain block, and moves the valve along the monorail to the equipment loading/unloading entrance.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 to 4 illustrate an embodiment of a traveling type valve unloader device according to the present invention.

FIG. 2 is a schematic diagram of the inside of the PCM4. In Figure 2,
A reactor pressure vessel 3 is installed within the PCM, and one end of a main steam pipe 5 is connected to the reactor pressure vessel 3.

The other end of the main steam pipe 5 passes through the PCM 4 and passes through the steam turbine (
(not shown), so that steam generated within the reactor pressure vessel 3 is sent to the steam turbine via the main steam pipe 5.

The main steam pipe 5 in the PCM 4 is equipped with main steam pipe valves, such as 5RV6 and MSIV7. Also,
Equipment entrance/exit above 5RV6 and POY3 (not shown)
Three monorails 20 are disposed horizontally between the upper part of the rail and the upper part of the rail. Furthermore, three monorails 21 are horizontally arranged between the upper side of MSIV7 and the upper side of the equipment loading/unloading entrance of POY3.

These monorails, for example, the monorail 20, are equipped with a traveling valve unloader device 1 for 5RV6.
Furthermore, the monorail 21 is equipped with a traveling type valve unloader device 2 for the MSIV7.

Next, the traveling type valve discharger devices 1 and 2 will be explained in detail with reference to FIG. 11.

Traveling valve unloader device 1 for 5RV6 and MSIV7
, 2 have the same structure. As shown in Figure 1,
Three monorails 20.21 are arranged, wheels 8 are movably mounted on each monorail 20.21, and the central axis of each wheel 8 is attached to a wheel support frame 9.

Further, a rail support body 1 is suspended from the wheel support frame 9 so as to be perpendicular to the monorails 20 and 21, so that the rail support body 11 is movable along the monorails 20 and 21. Furthermore, among the wheels 8, the central wheel 8 is a driving wheel driven by a drive motor 10 provided on the rail support 11, and the wheels 8 on both sides are driven wheels.

Further, a rail 13 is fixed below the rail support 11 in the same direction as the rail support 11, and the rail 13 is also arranged perpendicular to the monorail 20.21.

Two electric chain blocks 14 having hooks 15 are provided on the rail 13. The electric chain block 14 is movable along the rail 13, and the movement of the electric chain block 14 along the rail 13 and the hook 15
The vertical movement of is driven by a drive mechanism (not shown) within the electric chase block 14. Also, rail 1
Stoppers 12 are fixed to both ends of 3.

Of the three wheel support frames 9, the central wheel support frame 9 is fixed to the rail support 11, but the wheel support frames 9 on both sides are movable along the rail support 11. . For this reason, the wheels 8 of the wheel support frames 9 on both sides
can easily follow the bends and width differences of the monorail 20°21.

Further, the drive motor 10 that drives the wheels 8 and the drive mechanism in the electric chase block 14 are controlled by a control device (not shown) built in the rail support 11.

Next, the operation of this embodiment having such a configuration will be explained with reference to FIGS. 3 and 4.

First, the disassembly and transport work of 5RV6 using the traveling type valve transporter device 1 will be explained with reference to FIG.

First, place the 5R on the top of the 5RV6 attached to the main steam pipe 5.
The hook 15 of the electric chain hoist 14 closest to the V6 is hung upward.

In this case, a biased load will be applied to the rail support 11 and the rail 13, but this biased load is borne by the three wheels 8 and the wheel support frame 9 mounted on the three monorails 20. .

Next, the hook 15 of the other electric chain block 14 is hooked below the 5RV6, and the 5RV6 is turned sideways. Subsequently, the drive motor 10 is started with the 5RV6 suspended in the groove by the two electric chain blocks 14. As a result, the wheels 8 in the center are driven, and the traveling valve unloader device 1 moves along the monorail 20, and the 5RV6 is transported to the equipment loading/unloading entrance.

Next, 5RV6 is transported to the outside of PCV4 through the equipment loading/unloading entrance, where disassembly and inspection work is performed.

Next, the 5RV6, which has undergone disassembly and inspection, is carried to the main steam pipe 5 in the PCVJ and assembled by performing the reverse operation as described above.

All operations of these traveling valve discharger devices 1 are automatically controlled by a control device.

Next, in FIG.
This section explains the disassembly and transport work.

First, one electric chain block 14 is placed diagonally above (45 degrees) the MS I V7 attached to the main steam pipe 5. Next, hook the hook 15 of this one electric chain block 14 onto the upper part of the upper mechanism 7a of the MSIV7, and
Pull up the upper mechanism 7a of the SIV7 diagonally upward from the main body 7b of the MSIV7.

In this case, the hook 15 of the other electric chain block 14
is hooked to the lower part of the upper mechanism 7a of MSIV7. By gradually lifting the lower part of the upper mechanism 7a of the MSIV 7, the upper mechanism 7a can be smoothly pulled out from the main body 7b.

Note that when lifting the upper mechanism 7a, the rail support 11
The offset load applied to the rail 13 is borne by the three wheels 8 and the wheel support frame 9 installed on the three monorails 21.

After completely pulling out the upper mechanism 7a of the MSIV7 from the main body 7b, the MSIV
The drive motor 10 is started with the device 7 suspended horizontally. This drives the wheels 8 in the center, and the traveling valve unloader device 2 moves along the monorail 21, causing the upper mechanism 7 to move.
a is carried to the equipment loading/unloading entrance.

. Next, the upper mechanism 7a is transported to the outside of the PCV 4 through the equipment loading/unloading entrance, and disassembly and inspection work is performed.

After the disassembly and inspection work has been completed, the upper mechanism 7a is carried to the main body 7b of the MSIV 7 in the main steam pipe 5 in the PCV 4 and assembled by performing the reverse operation as described above.

All operating operations of the traveling valve discharger device 2 are automatically controlled by the control device.

As described above, according to this embodiment, 5RV6 and MSIV
The disassembly and transport work in step 7 does not require a large number of chain blocks, and there is no need to change the suspension between chain blocks, making the work easier, reducing the number of workers and improving work safety. can be achieved.

In addition, in the above embodiment, the configuration of two traveling valve unloading devices 1 and 2 for 5RV6 and MSIV7 was shown,
There may be one traveling type valve unloader device of either 5RV6 or MSIV7.

〔Effect of the invention〕

According to the present invention, when disassembling and transporting main steam pipe valves, there is no need for a large number of chain blocks, and there is no need to change the suspension between chain blocks, so the work can be carried out easily. It is possible to reduce the number of personnel and improve work safety.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of a traveling type valve unloading device according to the present invention, Fig. 2 is a layout diagram of the traveling type valve unloading device inside a PCV, and Fig. 3 is a diagram showing an SRV disassembly/export operation. A diagram showing
FIG. 4 is a diagram showing the disassembly and transport work of MSIV. 1.2... Traveling valve unloader device, 3... Reactor pressure vessel, 4... PCV, 5... Main steam pipe, 6... S
RV, 7...MSIV, 8...Wheel, 9...Wheel support frame, 10...Drive motor, 11...Rail support, 13...Rail, 14...Electric chain block , 20.21...monorail. Applicant's representative Mr. Sato 3rd cause

Claims (1)

[Claims] A rail support with a drive motor is movably suspended from a monorail extending horizontally between the upper part of the main steam pipe valve and the upper part of the equipment loading/unloading entrance in the reactor containment vessel. A rail supported perpendicularly to the monorail, an electric chain block disposed movably along the rail, and a control device for controlling a drive mechanism of the rail support and the electric chain block. A traveling valve loading/unloading device featuring: