JPH05196781A - Handling equipment for internal pump - Google Patents

Abstract

PURPOSE:To check up the function of a secondary seal after the secondary seal is fitted in a motor casing by a handling tool and thereby to enable immediate replacement of the secondary seal. CONSTITUTION:A secondary seal 17 fitted in a motor casing 13 is removed and upper and lower tension bars 20b and 20a with a load cell 21 interposed are connected by screwing to a handling tool 18 for fitting. A disk 22 is connected to the upper end of the upper tension bar 20b and a cylinder part 23 is connected on the upper side of this disk 22. The disk 22 is provided with a sensor 24 and a water supply-drain port 28. The sensor 24 is connected to a mechanism part 18b by a signal cable 25 and detects the position of the secondary seal 17. The water supply-drain port 28 is provided for checking up the liquid-tightness of the secondary seal 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pump handling device for removing and installing a secondary seal of an internal pump from below a reactor pressure vessel.

[0002]

2. Description of the Related Art As shown in FIG. 3, an internal pump 3 provided on a pump deck 2 of a reactor pressure vessel 1 of an improved boiling water reactor comprises a pump section 4 and a motor section 5. Has been done. The pump section 4 is provided in the downcomer section between the inner wall of the reactor pressure vessel 1 and the shroud,
It is configured to include an impeller 6, a diffuser 7, and the like.

A pump shaft 8 connected to the motor unit 5 is connected to the impeller 6, and the rotation of the motor unit 5 is transmitted through the pump shaft 8. The diffuser 7 is fixed to the upper end of a pump deck 2 provided at the bottom of the reactor pressure vessel 1 via a stretch tube 9 with a stretch tube nut 10.

The motor unit 5 is composed of a rotor 11, a stator 12, etc., and is housed in a motor casing 13 welded to the lower portion of the reactor pressure vessel 1. A motor cover 14 is fixed to the lower end of the motor casing 13 by a stud bolt 15 and a nut 16 to keep the inside of the motor casing 13 liquid-tight.

The internal pump 3 constructed as described above is disassembled in a procedure as shown in FIG. 4 at the time of periodic inspection of the nuclear reactor, and each part is inspected and repaired. That is, the motor cover 14 is first removed from the motor casing 13, and the motor unit 5 is taken out from below the motor casing 13. Next, the secondary seal 17, the stretch tube nut 10 and the like are taken out from below the motor casing 13, and then the impeller 6 is removed from above the reactor pressure vessel 1. Then, finally, like the impeller 6, the diffuser 7 and the stretch tube 9 are removed from above the reactor pressure vessel 1. After the inspection, the installation is performed in the reverse order of the above procedure.

By the way, the secondary seal 17 is removed and attached from below the motor casing 13 by using a handling tool 18 as shown in FIG. The handling tool 18 includes guide screws 19a and 19b attached to the motor casing 13.
As shown in FIG. 6, it is inserted into the motor casing 13 and the secondary seal 17 is attached at a predetermined position. Secondary seal
After mounting the handling tool 18, the handling tool 18 is removed from the motor casing 13 and moved to the storage location of the handling tool 18.

The handling tool 18 includes a main body 18a, a mechanism portion 18b attached to the upper portion of the main body 18a, a vertical movement shaft 18c attached to the central portion of the mechanism portion 18b, and a vertical movement shaft 18c fixed on the vertical movement shaft 18c. The upper plate 18d and the first pin from the side of the upper plate 18d
Arm 18f pivotally supported via 18e and this arm 18f
And a seal retainer 18h pivotally supported by a second pin 18g.

The main body 18a and the mechanism portion 18b are connected by a hydraulic connecting pipe 18i.
Is connected, and the vertical moving shaft 18c is pulled down by hydraulic pressure to move the secondary seal 17 in the radial direction.
Can be mounted by pressing on the inner surface of the motor casing 13, and the secondary seal 17 can be removed by lifting the vertical moving shaft 18c upward. In addition, reference numerals in the figure
34 indicates a hook.

[0009]

By the way, as shown in FIG. 7, the pump shaft 8 is inserted into the secondary seal 17 to confirm whether or not the secondary seal 17 attached by the handling tool 18 operates normally. It must be confirmed by applying water pressure from the pressure line 17a for operating the secondary seal 17.

However, in the prior art, if an abnormality occurs in the secondary seal 17, the pump shaft 8 is removed from above the reactor pressure vessel 1 or the handling tool 18 is inserted again into the motor casing 13. However, the work of removing the secondary seal 17 occurs, and there is a problem that a lot of work time is required.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal pump handling device in which a secondary seal handling tool is provided with a member capable of confirming the function of the secondary seal. is there.

[0012]

DISCLOSURE OF THE INVENTION The present invention relates to a tension for fixing with a screw portion to a handling tool for removing and installing a secondary seal mounted in a motor casing of an internal pump from below a reactor pressure vessel. A bar, a load cell connected to the tension bar by a screw portion for detecting the tension of the tension bar, a plate body fixed to the upper part of the tension bar, and a secondary seal provided on the plate body. It is characterized by comprising a tubular body and a position detection sensor for detecting the position of the secondary seal provided on the plate body.

[0013]

After the secondary seal is installed in the casing, the cylindrical part having the same diameter as the impeller shaft is fixed to the handling tool. Next, the tubular body is inserted into the secondary seal, and water pressure is applied to the secondary seal to bring it into close contact with the tubular body. Then, water is injected into the tubular body to check the seal.

That is, the tension bar is fixed on the handling tool, and the load cell and the cylindrical body are provided on the tension bar. After the secondary seal is mounted in the pump casing by this tubular body, the handling tool is raised to insert the tubular body into the secondary seal and operate the secondary seal. by this,
You can check the function of the secondary seal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an internal pump handling device according to the present invention will be described with reference to FIG. FIG. 1 is a vertical sectional view showing a main part of an embodiment of the present invention. In FIG. 1, reference numeral 23 denotes a cylindrical portion formed of a cylindrical body inserted into the secondary seal 17 mounted in the motor casing 13,
The cylindrical portion 23 is attached to a disc 22 made of a plate. The disk 22 is connected to the handling tool 18 shown in FIG. 6 by the tension bars 20a and 20b at the upper and lower portions and the load cell 21. Since the handling tool 18 has the same configuration as that described above, the same parts are designated by the same reference numerals and the description thereof will be omitted.

The disk 22 is provided with a sensor 24 for confirming that it is in close contact with the secondary seal 17, a water supply / drainage port 28 and a hose 29 for supplying or draining water from the cylindrical portion 23 to the pump casing 13. There is.

The internal pump handling device configured as described above operates as follows. First, the cylindrical portion 23 is inserted into the secondary seal 17 by the handling tool 18, the signal from the sensor 24 is sent to the handling tool 18 by the signal cable 25, and the disc 22 is the secondary seal.
Make sure that it adheres to the bottom surface of 17.

Next, the seal members 27a and 27b of the secondary seal 17 are provided.
In order to operate the
From the water supply / drain port 28 and the hose 29 provided in the motor casing 13
Supply a certain amount of water inside. After that, the handling tool 18 is lowered, a tensile force is applied to the cylindrical portion 23 while confirming the value of the load cell 21, and the function of the secondary seal 17 is determined by the presence or absence of leak water from the seal members 27a and 27b of the secondary seal 17. Confirmation is possible.

Next, another embodiment according to the present invention will be described with reference to FIG. In this embodiment, a hydraulic jack 32 is used instead of the handling tool 18 shown in FIG. 1, and a lower tension bar 20a is connected to the hydraulic jack 32. The hydraulic jack 32 has substantially the same function as the handling tool 18.

Reference numeral 31 in FIG. 2 indicates a work stage, and a hydraulic jack 32 is mounted on the work stage 31. Upper tension bar 20b and lower tension bar 20
A load cell 21 is interposed between a and a, and the load cell 21 is connected to an amplifier 33 by a cable 30. The upper tension bar 20b is connected to the disc 22.

In this embodiment, the hydraulic jack 32 is operated and the value of the load cell 21 is confirmed by the amplifier 33,
A tensile force is applied to the cylindrical portion 23 so that the seal member 27 of the secondary seal 17
The function of the secondary seal 17 can be confirmed with or without leak water from a and 27b. Therefore, according to this embodiment,
After confirming the function of the secondary seal 17,
Since it can be easily done, even if there is an abnormality in the secondary seal 17, it is possible to replace it immediately.

[0022]

According to the present invention, the function of the secondary seal can be confirmed after the secondary seal is attached, and the secondary seal can be replaced immediately even if there is any abnormality in the secondary seal. , The efficiency and reliability of handling work of the internal pump can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of an internal pump handling device according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the internal pump handling device according to the present invention.

FIG. 3 is a vertical sectional view showing an internal pump.

FIG. 4 is an exploded view showing a disassembly procedure of the internal pump in FIG.

5 is an external view showing a handling tool for attaching and removing the secondary seal of the internal pump in FIG.

6 is a vertical cross-sectional view showing a state in which a secondary seal is attached by the handling tool in FIG.

FIG. 7 is a vertical cross-sectional view showing that the secondary seal of the internal pump in FIG. 3 is activated.

[Explanation of symbols]

1 ... Reactor pressure vessel, 2 ... Pump deck, 3 ... Internal pump, 4 ... Pump section, 5 ... Motor section, 6 ... Impeller, 7 ... Diffuser, 8 ... Pump shaft, 9 ... Stretch tube, 10 ... Stretch tube Nuts, 11 ...
Rotor, 12 ... Stator, 13 ... Motor casing, 14 ... Motor cover, 15 ... Stud bolt, 16 ... Nut, 17 ... Secondary seal, 18 ... Handling tool, 19a, 19b ... Guide screw, 20a, 20b ... Tension bar, 21 ... load cell, 22
... disk, 23 ... cylindrical part, 24 ... sensor, 25 ... signal cable, 26 ... pressurized water piping, 27a, 27b ... sealing member, 28 ... water supply / drainage port, 29 ... hose, 30 ... cable, 31 ... work stage, 32 ... Hydraulic jack, 33 ... Amplifier, 34 ... Hook.

Claims (1)

[Claims] 1. A tension bar fixed by a screw part to a handling tool for removing and installing a secondary seal mounted in a motor casing of an internal pump from below the reactor pressure vessel, and a tension bar of this tension bar. A load cell connected to the tension bar for detecting tension with a screw portion, a plate body fixed to the upper part of the tension bar, a tubular body inserted into a secondary seal provided on the plate body, and the plate An internal pump handling device, comprising: a position detection sensor for detecting the position of the secondary seal provided on the body.