JP2001013285A - Support structure of recirculation pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the support structure of a recirculation pump capable of supporting while damping well vibration of the recirculation pump without using a receiving frame interfering with apparatuses of containment bottom. SOLUTION: A plurality of hanging hooks 7 are provided to a recirculation pump 4 placed on a circulation line L extending from a reactor pressure vessel 1, the recirculation pump 4 is hung with the hanging hooks 7 at a specified position and each hanging hook 7 is supported while damping with a plurality of vibration suppression connectors 14 extending from containment inner wall and beam 9 side. By this, the recirculation pump is supported and simultaneously damped well without using a receiving frame 10 interfering with components of containment 8 bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a recirculation pump for circulating cooling water in a reactor pressure vessel.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional reactor pressure vessel 1 is provided with a recirculation line L extending from a vessel body 2 to below a pedestal 3. Each of the recirculation lines L is provided with a recirculation pump (PLR pump) 4 for recirculating the cooling water in the container body 2.

[0003] The recirculation pump 4 comprises a pump section 5 located in the middle of the recirculation line L, and a motor section 6 for driving the pump section 5, and a plurality of hanging ears provided around the pump section 5. Are suspended from a plurality of beams 9, 9 ... which traverse the storage container 8 by wires W extending from 7, 7, ....

As shown in FIGS. 4 and 5, on a floor surface below the recirculation pump 4, a receiving base 10 made of H steel or the like is provided, and the pump section 5 is provided with a mechanical snubber. It is supported while being damped by a damping coupling 11 such as a bar.

That is, since the high-temperature cooling water flows through the conventional recirculation pump 4, it is supported by the wire W or the like so as to be suspended in the storage container 8 to allow thermal expansion. In order to prevent the vibration of the vehicle and the shaking during an earthquake, a plurality of
Is to be supported by.

[0006]

By the way, in the vicinity of the recirculation pump 4, a pipe constituting the recirculation line L and a suction stop valve 12 and a discharge stop valve 13 provided on the pipe are provided.
In addition, various pipes, devices and the like are installed.

[0007] However, since these pipes, devices, and the like are arranged in the cradle 10 or so as to cross the inside of the cradle in a complicated manner, the cradle is replaced when these pipes, devices, and the like are replaced during periodic inspection. There is a problem that 10 interferes. For this reason, conventionally, the work such as removing the entire cradle 10 before the replacement work and rebuilding the work after the work has to be performed every time the replacement work is performed, and there is an inconvenience that enormous labor and time are required. .

In addition, the cradle 10 is constructed by a large number of weldings, and at the time of construction, an ultrasonic survey of a floor surface and a work of placing a chemical anchor must be performed.
The construction work itself was not easy.

Accordingly, the present invention has been devised in order to effectively solve such a problem, and an object of the present invention is to provide a recirculation pump without using a cradle that interferes with equipment at the bottom of the containment vessel. It is an object of the present invention to provide a novel recirculation pump support structure that can be supported while favorably damping.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a recirculation pump provided in a circulation line extending from a reactor pressure vessel for circulating cooling water in the reactor pressure vessel. In the structure to support while damping,
A plurality of hanging ears are provided on the recirculation pump, the recirculation pump is hung to a predetermined position in the containment via the hanging ears, and each hanging ear is traversed through the containment wall and the inside of the containment. The support is provided while damping with a plurality of damping couplers extending from the beam side.

As a result, the recirculation pump can be supported while damping from the containment wall and the beam side, so that a conventional cradle is not required, and much labor and labor are required. Removal and construction work of the cradle can be omitted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 and 2 show one embodiment of a support structure for a recirculation pump according to the present invention.
Is a recirculation pump, 5 is a pump section constituting the recirculation pump, 6 is its motor section, 7 is a hanging ear provided around the pump section 5, 9 is a beam which horizontally traverses inside the storage container 8. , 12 and 13 are a suction stop valve and a discharge stop valve provided before and after the circulation line L of the recirculation pump 4, respectively.

As shown in the drawing, the support structure of the present invention first supports a pump section 5 and a motor section 6 constituting a recirculation pump 4 so as to be suspended by a wire W in the same manner as in the prior art. A plurality of suspension ears 7, 7, 7 (three in this embodiment) provided around the inner wall of the storage container 8 and the beams 9, 9 that traverse the storage container 8 in the vicinity thereof. Fixed support bracket 15,1
5 and 15 are respectively restrained and supported by vibration damping connectors 14, 14, 14.

As the vibration damping connecting member 14, for example, a vibration damping connecting member 14 such as a rod restrent filled with a working fluid in a cylinder is used. The effect which suppresses effectively is demonstrated.

Therefore, a slow displacement such as a thermal expansion caused by a flow of high-temperature cooling water is effectively allowed, so that no excessive stress is applied to the recirculation pump 4. Conversely, rapid displacement such as vibration of an earthquake or vibration during driving is effectively suppressed, so that the soundness of the recirculation pump 4 can be maintained.

In the support structure of the present invention, the recirculation pump 4 is supported from the inner wall of the storage container 8 and the beams 9, 9 by the vibration damping connector 14, as described above. Such a mounting stand is not required, and the work of removing and constructing the mounting base, which requires a great deal of labor and labor, can be omitted. As a result, there is no interfering object in the vicinity of the device, and it is possible to smoothly perform the replacement work and the like.

As shown in the figure, in the present embodiment, the case where three hanging ears 7, 7, 7 are provided has been described, but the number of the hanging ears 7 may be increased or decreased as necessary. Of course, it may be possible. In addition, one of the three hanging ears 7, 7, 7 is supported from the inner wall of the storage container 8. However, the arrangement of the hanging ears 7 is reversed, and The container 8 may be supported from the inner wall. Further, as shown in FIG. 2, the main body of the vibration damping connector 14 may be reinforced by a support rod 16 extending from the inner wall of the storage container 8.

[0019]

In summary, according to the present invention, since the conventional cradle is not required, the removal and construction of the cradle, which requires a great deal of labor and labor, can be omitted. As a result, there is no interfering object in the vicinity of the device, and it is possible to smoothly perform the replacement work and the like.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a support structure for a recirculation pump according to the present invention.

FIG. 2 is a side view showing an embodiment of a recirculation pump support structure according to the present invention.

FIG. 3 is a partial cross-sectional view showing a conventional recirculation line in a containment vessel.

FIG. 4 is a partially enlarged view showing a portion A in FIG. 3;

FIG. 5 is a plan view showing a support structure of a conventional recirculation pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor containment vessel 4 Recirculation pump 5 Pump part 6 Motor part 7 Hanging ear 8 Containment vessel 9 Beam 14 Damping connection L L Recirculation line W Wire

Claims (1)

[Claims] 1. A structure provided in a circulation line extending from a reactor pressure vessel to support a recirculation pump for circulating cooling water in the reactor pressure vessel while damping the recirculation pump. With hanging ears,
The recirculation pump is hung to a predetermined position in the containment vessel via the suspension ears, and each suspension ear is controlled by a plurality of vibration damping connectors extending from the inner wall of the containment vessel and the beam side traversing the interior of the containment vessel. A support structure for a recirculation pump characterized by being supported while shaking.