CN219031553U - Device for judging underwater hoisting height of reactor internals - Google Patents

Abstract

The application belongs to the technical field of nuclear power station overhaul, and particularly relates to a device for judging the underwater hoisting height of a reactor internals; one end of an indication surface in the device is fixed at the upper end of a counterweight base through an upper connecting rod and a lower connecting rod; a height adjusting slide block for adjusting the angle and the height between the two connecting rods is connected between the upper connecting rod and the lower connecting rod; a pulley is fixed between one end of the indication surface and the upper connecting rod, and the scale storage box is fixed at the upper connecting rod, and the scale bypasses the pulley and is connected with a plumb block; the other end of the indication surface is fixed with a laser level meter; the laser emitted by the laser level meter is parallel to the connecting surface between one end of the indicating surface and the upper connecting rod. The device can be used as an indicator of whether the equipment translates to the height, so that the dependence of the reactor equipment on the elevation displayed on the ring crane operating platform during underwater hoisting is reduced.

Description

Device for judging underwater hoisting height of reactor internals

Technical Field

The application belongs to the technical field of nuclear power station overhaul, and particularly relates to an underwater hoisting height discriminating device for a reactor internals.

Background

In the maintenance work of a reactor body of a pressurized water reactor nuclear power station, the water level is required to be synchronously lifted during hoisting of the internal components of the reactor due to the particularities of the reactor body so as to control the radiation dosage of a maintenance site, and the height confirmation can only be carried out through the display elevation of the annular crane due to the synchronous lifting of the water level, so that the lifting height is accurately determined without other means, and the collision during hoisting of a large part is easy to cause.

The reactor body is positioned at the nuclear island part of the nuclear power unit, belongs to one of core devices of a primary loop of the reactor unit, and is connected with main devices such as a main pump, an evaporator and the like. In the overhaul process, the reactor needs to be subjected to 2-4 times of underwater hoisting operations, and since the parts are relatively special, the re-supply can hardly be realized, so that the safety of equipment is required to be ensured during the hoisting.

During disassembly and overhaul of the unit, according to an overhaul plan, a working group needs to disassemble and overhaul the reactor body, during overhaul, the weight of the underwater hoisting components in the process is more than tens of tons, and because of the uniqueness of parameters such as the size and the like after the unit operates, the units are important components related to whether the unit can continue to operate, and the following requirements are met when the components are hoisted:

the disassembly and the assembly mode of the reactor core hanging basket and the protection pipe assembly are underwater hoisting, and the hoisting height and the hoisting speed of the hoisted objects are required to be controlled; there may be conditions of too low lifting of the crane and excessive environmental dose of too high lifting of the crane with scraping of the structure; the weight and the lifting speed of the hoisted object are monitored in the whole process in the hoisting process, and the lifting speed of the ring hook head in each stage in the hoisting process is definitely determined before the worker; the lifting height of the underwater hoisting can be confirmed by a hoisting span and a pile body work responsible person together to continue the next working step; during overhaul, when the ring crane is used for hoisting large parts, mechanical, electric and instrument control driving maintenance personnel are required to stand by at any time on a reactor overhaul site.

The current field mainly has the following difficulties for underwater hoisting of reactor equipment:

1. whether the lower part of the reactor equipment is lifted out of the reactor pressure vessel or the inspection shaft cannot be observed when the reactor equipment is lifted underwater, the current stage can only be used for carrying out the searchlighting by using an underwater lighting lamp, but only a small part of light can enter eyes of observers through the water surface due to the effect of water on the light, so that the observation is unclear, and in the observation process, the high radiation dose can be received due to the fact that the equipment is too close;

2. when the reactor equipment is hoisted under water, workers can raise the equipment height as much as possible under the condition of water level permission in order to prevent equipment from being knocked during translation, and the risk of accidental irradiation is caused by overhigh hoisting height of certain equipment;

3. because most of the equipment is positioned in the pressure vessel during operation, neutron excitation causes activation, the height of the equipment is required to be strictly controlled below the water surface in the hoisting process so as to ensure that the water plays a shielding role, reduce the environmental dose, but ensure that the water surface cannot be higher than the electric part or the ring crane hook head of the equipment so as not to cause equipment damage;

4. the elevation of each unit is different due to different data, so that the visual effect is different in the lifting process, and the visual observation of human eyes basically does not play a role in the work;

5. the elevation reliability of the ring crane operating platform is doubtful because the ring crane performance is different, and the lifting height cannot be controlled only by the ring crane operating platform because the ring crane operating room cannot completely observe the field conditions and the tired factors of personnel.

Disclosure of Invention

The purpose of the application is to provide a device for judging the underwater hoisting height of a reactor internals, and solve the problem that the underwater hoisting of reactor equipment is mainly difficult in the current field.

The technical scheme for realizing the purpose of the application comprises the following steps:

the embodiment of the application provides a reactor internals hoist and mount height discriminating means under water, the device includes: the device comprises a plumb block, a scale, a laser level, an indication surface, an upper connecting rod, a lower connecting rod, a height adjusting slide block, a scale storage box and a counterweight base;

one end of the indicating surface is fixed at the upper end of the counterweight base through an upper connecting rod and a lower connecting rod; a height adjusting slide block for adjusting the angle and the height between the two connecting rods is connected between the upper connecting rod and the lower connecting rod;

a pulley is fixed between one end of the indication surface and the upper connecting rod, and the scale storage box is fixed at the upper connecting rod, wherein the stored scale bypasses the pulley and is connected with the plumb block;

the other end of the indication surface is fixed with a laser level meter; the laser emitted by the laser level meter is parallel to the connecting surface between one end of the indicating surface and the upper connecting rod.

Optionally, the apparatus further includes: the level gauge fixture is used for fixing the laser level gauge;

the level gauge fixture is a three-jaw fixture prefabricated according to a laser level gauge base.

Optionally, the height adjustment slider includes: a lower connecting rod locking bolt, an upper connecting rod locking bolt, a connecting rod angle fixing bolt and a connecting rod angle rotating device;

the connecting rod angle rotating device comprises two fixing parts capable of rotating mutually, and the angle between the two fixing parts is fixed through a connecting rod angle fixing bolt;

the two fixing parts are respectively used for fixing the upper connecting rod and the lower connecting rod and locking the upper connecting rod and the lower connecting rod through an upper connecting rod locking bolt and a lower connecting rod locking bolt respectively.

Optionally, the lower connecting rod is threaded into the upper end of the counterweight base.

Optionally, the lower connecting rod is no more than 1000mm in length; the length of the upper connecting rod is not more than 500mm.

Optionally, the scale storage box is fixed at the joint of the upper connecting rod and the height adjusting slide block.

Optionally, the indication surface has a zigzag structure.

The beneficial technical effects of this application lie in:

1) The device and the method for judging the underwater hoisting height of the reactor internals can be used as an indicator of whether the equipment translates to the height, so that the dependence of the reactor equipment on the elevation displayed on the ring hoisting operation table during underwater hoisting is reduced;

2) The device and the method for judging the underwater lifting height of the reactor internals, which are provided by the embodiment of the application, are complementary with the display elevation of the annular crane and mutually verified, so that the possibility of uncontrollable consequences caused by human errors or lifting errors in a single means can be reduced, the possibility of occurrence of lifting events of large equipment is reduced, and the possible economic loss of companies is reduced;

3) According to the device and the method for judging the underwater lifting height of the reactor internals, which are provided by the embodiment of the application, the use is easy, so that the use preparation time is less, the overhaul work process cannot be influenced, meanwhile, as the equipment is in place in a reactor overhaul field during use, when the equipment is lifted, lifting staff and field staff can intuitively see whether the equipment height meets the requirement of translational height, the lifting is not required to be stopped, repeated confirmation is not required, the overhaul time can be shortened to a certain extent, the benefit of a company is increased, and the working dosage is reduced;

4) The device and the method for judging the underwater hoisting height of the reactor internals are high in universality, have directional transformation space, can be applied to other fields of maintenance sites in combination with actual working demands, and have great potential for optimizing and improving hoisting work with hoisting height requirements;

5) The device for judging the underwater hoisting height of the reactor internals is movable, simple in operation, simple in structure, small in occupied area and easy to adjust the vertical height, so that the device can be used in the on-site disassembly and reinstallation of the reactor internals;

6) According to the device and the method for judging the underwater lifting height of the reactor internals, the use of the staff gauge can reduce the error of the mechanical staff gauge to a great extent, the staff gauge is used in combination with a laser level, the error caused by a mechanical structure can be reduced, the reliability of a tool is improved, and the safety of personnel and equipment in working is further guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of a device for discriminating the underwater hoisting height of a reactor internals according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a height adjustment slider in an underwater lifting height determining device for a reactor internal component according to an embodiment of the present application.

In the figure:

1-a plumb block; 2-staff gauge; 3-level fixture; 4-laser level gauge; 5-an indication surface; 6-a height adjusting slide block; 7-a scale storage box; 8, a counterweight base; 9-an upper connecting rod; 10-a lower connecting rod; 11-pulley; 12-lower connecting rod locking bolt; 13-upper tie rod locking bolt; 14-connecting rod angle fixing bolts; 15-a connecting rod angle rotating device.

Detailed Description

In order to better understand the present application, a clear and complete description of the technical solutions in the embodiments of the present application will be provided below with reference to the drawings in the embodiments of the present application. It will be apparent that the embodiments described below are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by a person skilled in the art without the exercise of inventive faculty, are within the scope of protection of the present application, based on the embodiments described herein.

In the description of the embodiments of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience in describing the embodiments of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In order to solve the problems in the prior art, the device and the method for judging the underwater hoisting height of the reactor internals, provided by the embodiment of the application, apply the most reliable design thought of a mechanical scale and a plumb line, calculate through a design drawing, determine the vertical distance between the hoisting height and the plane of the cement structure under the condition that the height of the cement structure is kept unchanged, take a value through the tool, and set a translation position indication mark after hoisting the reactor internals so as to achieve the purpose of carrying out translation indication of the hoisting position.

Based on the foregoing, for clarity and detailed description of the above-described advantages of the present application, a detailed description of the embodiments of the present application will be provided below with reference to the accompanying drawings.

Referring to fig. 1, the diagram is a schematic structural diagram of a device for discriminating the underwater lifting height of a reactor internals according to an embodiment of the present application.

The embodiment of the application provides a reactor internals hoist and mount height discriminant device under water, its characterized in that, the device includes: the device comprises a plumb block 1, a scale 2, a laser level 4, an indication surface 5, an upper connecting rod 9, a lower connecting rod 10, a height adjusting slide block 6, a scale storage box 7 and a counterweight base 8;

one end of the indicating surface 5 is fixed at the upper end of the counterweight base 8 through an upper connecting rod 9 and a lower connecting rod 10; a height adjusting slide block 6 for adjusting the angle and the height between the two connecting rods is connected between the upper connecting rod 9 and the lower connecting rod 10;

a pulley 11 is fixed between one end of the indication surface 5 and the upper connecting rod 9, the scale storage box 7 is fixed at the upper connecting rod 9, and the stored scale 2 is connected with the plumb block 1 by bypassing the pulley 11;

the other end of the indication surface 5 is fixed with a laser level meter 4; the laser level 4 emits laser light parallel to the connection surface between one end of the indicating surface 5 and the upper connecting rod 9.

As an example, the indication surface 5 has a zigzag structure. The laser level 4 is fixed at the lower part of the Z-shaped structure, and the upper part of the Z-shaped structure is connected with the pulley 11.

In one example, the apparatus further comprises: a level clamp 3 for fixing the laser level 4;

the level fixture 3 is a three-jaw fixture prefabricated according to the base of the laser level 4.

In some possible implementations of the embodiments of the present application, as shown in fig. 2, the height adjustment slider 6 includes: a lower connecting rod locking bolt 12, an upper connecting rod locking bolt 13, a connecting rod angle fixing bolt 14, and a connecting rod angle rotating device 15;

the connecting rod angle rotating device 15 comprises two fixing parts capable of rotating mutually, and the angle between the two fixing parts is fixed through a connecting rod angle fixing bolt 14;

the two fixing parts are respectively used for fixing the upper connecting rod 9 and the lower connecting rod 10, and locking the upper connecting rod 9 and the lower connecting rod 10 through an upper connecting rod locking bolt 13 and a lower connecting rod locking bolt 12 respectively.

Through the height adjustment slider 6, the angle and the height between the two connecting rods are adjusted, so that the multi-angle and height adjustment of the indication surface is realized. In one example, the length of the connecting rod is customized according to the working requirements, and the length of the lower connecting rod 10 is not more than 1000mm; the upper connecting rod length 9 does not exceed 500mm, which might otherwise affect structural stability.

As an example, the lower connecting rod 10 is screwed into the upper end of the counterweight base 8.

In one example, the scale receiving box 7 is fixed at the junction of the upper connecting rod 9 and the height adjustment slider 6.

The method for discriminating the underwater lifting height of the reactor internals provided by the embodiment of the application is described in detail below with reference to a specific example.

The position where no shielding object exists between a position of a reactor 34m hall overhaul area and a reactor vertical shaft or an inspection shaft is found to be used for installing the underwater hoisting height judging device for the reactor internals.

When the device is used, firstly, the height required to be set is set through the scale 2, the height 5 of the indication surface is set to be the height through the height adjusting slide block 6 and is locked, the laser level 4 is installed at the level fixture 3, the laser line emitted by the laser level 4 can be obviously observed at the vertical shaft of the reactor, the height of the base of the laser level 4 in the X, Y axial direction is adjusted through the height adjusting bolt, the laser level 4 is set to be a horizontal position, a maintenance area is established, and the measurement tool is prevented from being touched by mistake or operated by mistake in the hoisting process.

After jointly confirming the set height of the measuring tool by a lifting worker and a reactor body maintenance worker, starting to lift the reactor body equipment, and in the lifting process, observing whether a laser line is projected to the height of a reference surface of the lifting equipment or not at all, namely, centering and guiding the equipment to the lower end surface, lifting the equipment to the lifting equipment when the laser line is projected to the lower end surface, confirming elevation with a ring crane control room, and translating if the confirmed elevation of the ring crane control room meets the requirement; if the two types of the hoisting tools are inconsistent, the hoisting personnel and the reactor body maintainer jointly check the elevation of the tool and the ring crane to confirm the height, and the phenomenon that the means are excessively dependent due to single means is avoided, so that unpredictable influences or consequences such as exceeding of environmental dose and equipment damage are caused by human errors or equipment faults.

In the lifting process of the reactor internals, operators of the ring crane control room pay attention to elevation specified in a program, and personnel in a maintenance site of the reactor 34m hall pay attention to whether a lifting equipment datum plane reaches the height of a measuring tool indicating surface, when any party finds that the lifting equipment datum plane reaches the specified height, the operators have rights to stop lifting, communicate with each other, remove errors and evaluate the lifting height of the field equipment, so that the occurrence rate of events is reduced.

The use of the device for judging the underwater hoisting height of the reactor internals provided by the embodiment of the application has the following advantages,

1) The reliability of underwater hoisting of the reactor internals is improved, and the possibility of hoisting events is reduced;

2) The efficiency of underwater hoisting of the reactor internals is improved, the situation that hoisting actions are stopped for many times due to incapability of observing underwater conditions is avoided, the underwater hoisting time is too long, the occupation time of the ring hoisting and the UJA34 m field cleaning time are prolonged, the overhaul main line is shortened, the overhaul process is accelerated, and the economic benefit of a company is improved;

3) The method for judging the underwater hoisting height of the reactor internals is beneficial to judging the quality of the underwater hoisting of the reactor internals during overhaul, optimizing the overhaul step and improving the overhaul quality by judging the elevation of the ring hoisting hook head and using a special tool to refer to the hoisting object lifting upper limit, wherein the parts are independently acted and are not mutually influenced, and meanwhile, the parts are mutually referred to and mutually verified;

4) The use of the special tool for judging the underwater hoisting height of the reactor internals limits the hoisting height of the reactor internals to a certain extent, reduces the possibility of accidental irradiation caused by overhigh hoisting of the reactor internals during hoisting, and is beneficial to guaranteeing the radiation protection safety of on-site workers;

5) Because the reactor internals are close to nuclear fuel for a long time, under the activation effect of neutron irradiation, the radiation level of equipment is higher, and the hoisting time is shortened by adopting the method for judging the underwater hoisting height of the reactor internals, so that the equipment can be installed in a shielding cylinder or a pressure container as soon as possible, and the irradiated dose of field staff can be reduced to a great extent.

The device for judging the underwater hoisting height of the reactor internals can be popularized and applied in the related work of the same type of units; the method can be popularized to similar work of other power stations; has good reference significance for other similar works in the same industry.

While the present application has been described in detail with reference to the drawings and the embodiments, the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. None of the details described in this application may be prior art.

Claims (7)

1. A device for discriminating the underwater lifting height of a reactor internals, characterized in that it comprises: the device comprises a plumb block (1), a scale (2), a laser level (4), an indication surface (5), an upper connecting rod (9), a lower connecting rod (10), a height adjusting slide block (6), a scale storage box (7) and a counterweight base (8);

one end of the indicating surface (5) is fixed at the upper end of the counterweight base (8) through an upper connecting rod (9) and a lower connecting rod (10); a height adjusting slide block (6) for adjusting the angle and the height between the two connecting rods is connected between the upper connecting rod (9) and the lower connecting rod (10);

a pulley (11) is fixed between one end of the indication surface (5) and the upper connecting rod (9), the scale storage box (7) is fixed at the upper connecting rod (9), and the stored scale (2) bypasses the pulley (11) to be connected with the plumb block (1);

the other end of the indication surface (5) is fixed with a laser level meter (4); the laser emitted by the laser level meter (4) is parallel to a connecting surface between one end of the indicating surface (5) and the upper connecting rod (9).

2. The apparatus for discriminating an underwater lifting height of a reactor internals according to claim 1 further comprising: a level fixture (3) for fixing a laser level (4);

the level gauge fixture (3) is a three-jaw fixture prefabricated according to a base of the laser level gauge (4).

3. The device for discriminating a lifting height under water of a reactor internals according to claim 1, characterized by a height adjusting slider (6) comprising: the device comprises a lower connecting rod locking bolt (12), an upper connecting rod locking bolt (13), a connecting rod angle fixing bolt (14) and a connecting rod angle rotating device (15);

the connecting rod angle rotating device (15) comprises two mutually rotatable fixing parts, and the angle between the two fixing parts is fixed through a connecting rod angle fixing bolt (14);

the two fixing parts are respectively used for fixing the upper connecting rod (9) and the lower connecting rod (10) and locking the upper connecting rod (9) and the lower connecting rod (10) through an upper connecting rod locking bolt (13) and a lower connecting rod locking bolt (12).

4. The device for discriminating the underwater lifting height of the internals of a reactor according to claim 1, characterized in that the lower connecting rod (10) is screwed into the upper end of the counterweight base (8).

5. The device for discriminating the underwater lifting height of the internals of a reactor according to any one of claims 1 to 4, characterized in that the length of the lower connecting rod (10) does not exceed 1000mm; the length of the upper connecting rod (9) is not more than 500mm.

6. The device for discriminating the underwater lifting height of the reactor internals according to claim 1, characterized in that the scale receiving box (7) is fixed at the junction of the upper connecting rod (9) and the height adjusting slider (6).

7. The device for discriminating the underwater lifting height of a reactor internals according to claim 1, characterized in that the indicating surface (5) has a zigzag structure.

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