KR100437279B1 - Electrical penetration assemblies with pressure monitoring system - Google Patents

Abstract

The present invention relates to an electrical through-assembly assembly applied to a nuclear power plant, water, thermal power plant, the present invention increases the ease of replacement and sealing function of the wire assembly module providing three isolated sealing zones, Connect all the holes where the wire assembly module is assembled to the gas leakage monitoring hole to maximize the gas leakage monitoring function, so that the pressure boundary inside and outside the reactor is kept constant at all times to maximize safety. In providing a penetrating assembly.

In the present invention, the electric wire assembly assembly 50 is applied to the electric wire assembly module 60 applied to supply the electric power of the low pressure electricity and control, the measurement electric line through the reactor concrete containment wall, the electric wire assembly The module 60 is a low pressure conductor 16 coated with an insulating film is continuous through the processing hole of the elastic sealing material 15 of the polymer material, and inserted into the stainless steel conduit 14, but the conventional It is achieved by an electric through-assembly assembly having a pressure maintaining monitoring function, which is formed by sealing the inside as a compression sealing portion (P / S) formed by repeatedly pressing the outer circumference of the stainless conduit 14 by a die. .

Description

Electrical penetration assemblies with pressure monitoring system

The present invention relates to an electrical through-assembly assembly that is applied to control, low-voltage power supply, and measurement of various reactors inside a nuclear reactor through a concrete containment wall of a nuclear power plant, and more particularly, an electric wire providing three isolated sealing zones. Increase the ease of replacement and sealing function of the assembly module, and connect all the holes in which the wire assembly module is assembled from the outside to the gas leakage monitoring hole to maximize the gas leakage monitoring function. The present invention relates to an assembly of electric through-holes having a pressure-maintaining monitoring function that maximizes safety by keeping constant at all times.

The electrical through-assembly assembly is used to pass the concrete containment wall surrounding the reactor with low voltage power supply cables, cables for control and measurement of internal equipment.

The concrete containment wall functions to separate the external environment from the internal ambient environment.

Thus, in order to operate and control the equipment in an internal contaminated environment, the electrical through-assembly assembly is essentially applied with a perfect seal inside and outside.

However, such an electrical through-assembly assembly needs to maintain a constant pressure at all times in order to maintain the perfect sealing state to prevent leakage of the internal polluted environment to the outside as well as to monitor the ease of exchange and the internal pressure.

That is, in order to prevent leakage through the opening of the concrete containment wall, an effective seal must be provided between the penetrating body and the wall, and the sealing means for installing the penetrating body in the concrete containment wall is installed to check and the surrounding environment of the containment wall. Seals from the sides shall be maintained and means should be provided for monitoring and testing the complete condition of the seals to determine the extent of leakage through the containment wall in the event of a leak in the contaminated environment.

Other attempts to develop such a sealing structure have been sought in various directions in the past, but the sealing effect was not desirable.

Thus, in recent years, the electrical through-assembly assembly in such a nuclear power plant is provided with the aforementioned low voltage power supply cable (conductor), control and measurement cable (conductor), and the conductors for the passage of cables applied inside the stainless tube. Passed inside the sealing body made of polymer material with holes, and composed of stainless tube assembly (wire assembly module), this wire assembly module is a blind flange type header plate (named main plate (face plate)). A technique for assembling and sealing by three ferrules and tube caps made of stainless steel in an assembling hole provided in a header plate is disclosed in US Pat. No. 4,002,345.

That is, the U.S. Patent No. 4,002,345 is a seal assembly patent that continuously provides an isolated sealing zone and consists of a front ferrule, an intermediate ferrule, and a rear ferrule, and provides three sealing zones that are separated from each other.

The U.S. Patent No. 4,002,345 improves the sealing effect by overcoming the shortcomings of the prior art, but there is a problem that the disadvantage that may be fixed in the long-term use by the compression sealing of the three ferrules, there is a potential ferrule stainless steel outer surface There was a disadvantage that the sealing effect is not perfect while being pressed in.

The present invention has been researched and developed to effectively solve the disadvantages of the above-described source technology,

That is, the present invention, first, to have a machining surface inside the dislocation ferrule to be inserted deeper into the outer surface of the stainless tube to improve the sealing effect,

Second, the improvement of preventing the seizure by silver-plating potential ferrule and intermediate ferrule,

Third, process the hole inside the sealing material made of polymer inside the stainless tube and pass the cable (conductor) into the inside and press the stainless tube to provide the sealing area and fill the sealing area with nitrogen gas to prevent the corrosion effect It is applied to the assembly of electrical through-holes to have the function of monitoring the leakage of

Fourth, the stainless steel tube, the sealing material of the polymer material, and the cable (conductor) portion passed through the sealing material was applied to the structure of the complete sealing by crimping using eight compression dice.

In other words, the present invention changes the shape of the dislocation ferrule so that the dislocation ferrule has a function of maintaining the sealing while being pressed into the stainless tube of the wire assembly module while eliminating the possibility of fixing the seal assembly means consisting of the front, middle and rear ferrules. To increase the press-fitting effect, and to apply the sealing assembly means having the function of providing three separate sealing zones to the electric through-hole assembly for the nuclear power plant. The present invention provides an assembly of electric through-holes with pressure maintaining monitoring that maximizes ease of dismantling.

In addition, the present invention introduces a cable (conductor) by using a processing hole of the elastic sealing material of the polymer material inserted into the stainless steel tube of the wire assembly module and crimped by using a crimping die outside the stainless steel tube. By providing a hole at a predetermined position of the stainless steel tube to match with the gas leakage monitoring hole processed in the front plate to assemble using the sealing assembly means to maximize the sealing effect between the inside and outside, as well as the wire assembly module All the assembled holes are connected to the gas leakage monitoring hole to finally connect the external line for gas leakage monitoring, and the pressure switch, pressure gauge and valve are attached to the rear end to monitor the gas leakage. The present invention provides an assembly of electrical through-sections with a monitoring function.

1 is a central longitudinal sectional view of an electrical through-assembly assembly incorporating the present invention, a state diagram attached to a concrete containment wall;

2 is an enlarged view of a part of the extract of FIG.

3 and 4 is an enlarged view of a part excerpt of FIG.

5 and 6 is an excerpt assembly and exploded view of the sealing assembly of the present invention,

Figure 7 is an enlarged view showing the installation structure of the temperature sensor of the present invention,

8 is an enlarged excerpt showing an installation structure of the gas leakage monitoring system of the present invention,

Figure 9 is an enlarged view showing the installation of the branch valve applied to the present invention.

<Description of Symbols for Major Parts of Drawings>

44: temperature sensor 50: electrical through-assembly assembly

60: wire assembly module 70: gas leakage monitoring system

Hereinafter, a configuration of a preferred embodiment will be described in detail with reference to the accompanying drawings.

That is, as shown in Figs. 1 to 9, the electrical through-assembly assembly of the present invention is denoted by 50, and the electrical through-assembly assembly 50 is attached to the concrete wall 1 forming a part of the reactor facility. Hex bolts 33 and spring washers 34 are mounted on the installed flange 3.

The electrical through-assembly assembly 50 has a front plate (2) at the left end and two reinforcement plates (6a, 6b) at the right end, so that the wire through module (60) has a potential ferrule on the front plate (2). 18), the intermediate ferrule (19), the rear ferrule (20) and the tube cap (17) is fixed to provide three sealing zones, the wire through the module 60 extending into the reactor, the space maintenance pipe (7) (8) and has a structure that is assembled stably through the holes machined to the reinforcing plates (6a, 6b) fixed by the extension bolt (9).

The rear reinforcing plate (6b) is assembled to the rear is assembled with the space maintenance pipe (7) to the extension bolt (9) assembled to the front plate (2), and the second reinforcement when the intermediate reinforcing plate (6a) is assembled After assembling the holding pipe (8) was fixed by the nut (10), it is provided with three to four extension bolts in the circumferential direction.

Assemble the " U " shaped nut 11 in the state of assembling the rear reinforcement plate 6b to the three to four extension bolts 9 assembled in the circumferential direction, and tighten the spring washer 12 and the nut 13. By sequentially assembling will have a structure to complete the assembly of the intermediate reinforcing plate (6a) and the rear reinforcing plate (6b).

In particular, the "U" shaped nut 11 is finally installed in the sleeve pipe 4 provided with the electrical through-assembly assembly 50 to the reactor concrete containment wall 1 so that there is no movement even in vibration and earthquake. It is used to securely fix the electrical through-assembly assembly 50.

The wire assembly module 60 is a wire (wire) 16 through the hole processed in the indentation direction of the elastic material 15 is inserted into the installation of the polymer material inside the conduit 14 of stainless steel on the outside and inside of the reactor. The drawn and extended to the inside, and the stainless steel conduit 14 is a pressing sealing portion formed by pressing both outer peripheral edges to have a central portion spaced at a predetermined interval using a special pressing tool (not shown) (P). / S) to form a sealing region (S) of the inner side in a repetitive formation with a constant interval, as shown in Figure 2, the wire assembly module 60 to the front plate (2) potential ferrule (18), The intermediate ferrule 19 and the rear ferrule 20 are applied to assemble the assembly cap 17 to provide three sealing zones (see FIG. 5 and FIG. 6, which are enlarged and exploded views of "A").

The three sealing zones have a ring-shaped space 40 inside the front portion of the front ferrule 18 so that the middle ferrule 19 and the rear ferrule 20 are screwed on the tube cap 17 by the front plate 2. The tapered part of the tapered part of the inner side of the distal ferrule 18 extends as the intermediate ferrule 19 moves forward and closes to the outer surface of the conduit (stainless steel tube). The front plate 2 is brought into close contact with the circumferential surface of the machined hole to provide a closed space 41 on the outer side of the dislocation ferrule 18, and the inner and middle ferrules 19 of the dislocation ferrule 18 inside. To provide a sealing space 42 in the front of the.

The potential ferrule 18 has a connecting hole 43 in the circumferential direction so that the sealing space 42 is connected to the gas leakage detecting hole 39.

At this time, the rear ferrule 20 is press-fitted into the inner portion of the intermediate ferrule 19 by tightening the cap 17 of the assembly cap 17 while pressing the outer circumferential surface of the conduit 14 of stainless steel, the intermediate ferrule 19 and the rear ferrule ( As 20), the sealing space 42 is provided inside, thereby preventing gas leakage to the outside.

The structure of sealing the outer surface of the conduit 14 made of stainless steel to which the three ferrules 18, 19, and 20 and the assembly cap 17 are applied is an electrical through which the wire assembly for low voltage power and control and measurement is provided. It is an important element of the subassembly.

The sealing area providing technology using the three ferrules and the cap for assembling is disclosed in U.S. Patent No. 4,002,345, which is a source technology, but the improvement of the present invention is a ring-shaped circumferential space (the inside of the potential ferrule 18). 40, which is press-fitted to the outer surface of the conduit (stainless tube) 14 of the wire assembly module 60 by the conical hole of the front plate 2 by screwing the cap 17 for assembling more strongly than the conventional electric potential ferrule. To increase the sealing force,

In particular, the front ferrule (20) and the intermediate ferrule (19) to pressurize the inner surface of the front plate (2) and the outer circumferential surface of the stainless steel material by the forward operation of the rear ferrule (20) by screwing the assembly cap (17). ) Provides a seal while preventing sticking during prolonged fixing by silver plating.

The above-described method is the same as the structure of the wire assembly module 60, as shown in Figs. 1, 2 and 7, the temperature sensor 44, which is an assembly for heat sensing, which is assembled in the same way as the electrical through-assembly assembly. Since the sealing structure is also applied in the same way, the description is omitted.

On the other hand, as shown in Figure 1, the front plate 2, each wire assembly module 60, that is, low pressure and control, measurement wire assembly module 60, temperature sensor 44, branch valve 45, etc. It is mounted, and the nitrogen gas is filled through the filling conduit 31 shown in each of the wire assembly module 60, the temperature sensor 44, the branch valve 45 and the like, which is the respective assembly In the case of leakage in the gas leakage monitoring system 70, it is possible to check.

As shown in detail in the enlarged view of FIG. 8, the gas leakage monitoring system 70 includes a cap 22 and a front ferrule in the gas leakage detection hole 39 of the front plate 2. 23), to be assembled using the bag 24, branched from the T-shaped pipe 26 through the pipe 21, one is filled with gas through a known pressure gauge 29 and T-shaped pipe 28 and It consists of a valve 30 attached to be removable, and the other branch branched from the T-shaped pipe 26 is attached to the pressure switch 25 to check the pressure drop at the set pressure, and to the central control panel It is equipped with a function to make an alarm sound by connecting.

As shown in the enlarged view of FIG. 9, the branch valve 45 has an o-ring 32 on the flange 2 for welding, which is mounted on the front plate 2 and the concrete containment wall 1 of the nuclear power plant. (32-1) is applied to each mounting nut (35) inserted into the welding flange (3) by assembling bolts using a spring washer (34), and the branch valve Open 45 to fill nitrogen gas to O-rings 32 and 32-1 so that leakage of gas from the gas leakage monitoring system 70 can be monitored, and the filling pipe 31 of nitrogen gas Each end portion has a structure in which the O-ring 41 is applied to the plug bolt 36 to seal it.

The branch valve 45 passes through the conduit 46 between the O-rings 32 and 32-1 by the filling conduit 31 of the front plate 2, and opens the valve seat 47 of the conduit to the valve rod 47. The O-ring 49 mounted on the circumferential surface 48 is capable of opening and closing forward and backward by screw rotation in a state in which airtightness is maintained outside.

The wire assembly module 60 and the temperature sensor 44 solve the problems in use of the wire assembly module 60 and the temperature sensor 44 by disassembling the assembly cap 17 so as to be freely replaced. And exchange can be used to achieve many purposes as the electrical through-assembly assembly,

In particular, in the present invention, each assembly module 60, 44 is a state in which the insulation film is coated in the processing hole of the elastic sealing material 15 of the polymer material inserted into the stainless steel conduit 14 is inserted state The stainless steel conduit 14 is formed by a compression seal portion (P / S) formed by repeated pressing by a die to form a perfect sealing structure therein, due to the characteristics of the material according to the long-term use to prevent corrosion and at the same time sealing Perfection ensures safety.

This invention is not only limited to the application of nuclear power plants, but also reveals that it is possible to use water and thermal power plants.

As described in detail above, the present invention is an electrical through-assembly assembly capable of supplying a low voltage power cable, a control and a measurement cable in a nuclear power plant and a water and a thermal power plant, basically to seal the gas to achieve a pressure boundary, gas It is fundamentally to prevent leakage and leakage, and to ensure long-term reliability and safety to monitor the pressure drop and leakage in the gas-sealing zone due to long-term operation and to detect temperature changes such as temperature increase and decrease. In addition, it is easy to disassemble and assemble at the site, so it is easy to repair and replace.

Claims (7)

In the electrical through-assembly assembly 50 to which the wire assembly module 60 is applied through the reactor concrete containment wall and applied to the power supply of low-pressure electricity and control, the measurement electric line inside the reactor, The wire assembly module 60 is a low pressure conductor 16 coated with an insulating film is continued inward through the processing hole of the elastic sealing material 15 of the polymer material, and inserted into the stainless steel conduit 14, An electric through-assembly assembly having a pressure maintaining monitoring function, characterized in that the inside is sealed by a compression seal (P / S) formed by repeatedly pressing the outer circumference of the stainless conduit (14) by a common die. The method of claim 1, The wire assembly module 60 is inserted into the front plate (2) of the potential plate 18, the intermediate ferrule (19), the rear ferrule (20) of the silver plated stainless steel to prevent seizure and the assembly cap (17) ), The electrical through-assembly assembly having a pressure maintaining monitoring function, characterized in that the assembly is tightly assembled by screwing to seal the outside. The method of claim 1, The front plate (2) is configured with a temperature sensor (44) to measure the temperature inside the electric through-hole assembly having a pressure holding monitoring function. The method of claim 1, The front plate 2 is provided with a branch valve 45 in addition to the respective wire assembly module 60 and the temperature sensor 44, the front through the filling pipe 31 formed in the front plate (2) Nitrogen gas is filled to the assembly portion of the wire assembly module 60 of the plate 2, and leakage of the leakage is generated at each of the assembly portions of the wire assembly module 60, the temperature sensor 44, and the branch valve 45. Case or internal pressure drop assembly of the electrical through which the pressure maintenance monitoring function, characterized in that configured to be confirmed from the outside by the gas leakage monitoring system (70) associated with the front plate (2). The method of claim 4, wherein The gas leakage monitoring system 70 allows the pipe 21 to be assembled to the front plate 2 using the cap 22, the front ferrule 23, and the back ferrule 24, and the pipe 21 is assembled. Branched from the T-shaped tube 26 through one is composed of a known pressure gauge 29 and the valve 30 attached to the gas filling and removal through the T-shaped tube 28, branched from the T-shaped tube 26 The other part is attached to the pressure switch 25 so as to check the pressure drop at the set pressure, and the pressure maintenance characterized in that it has a function to connect to the normal central control panel so that an alarm sounds Aggregate of electrical through parts with monitoring function. The method according to claim 4 or 5, The branch valve 45 applies the O-rings 32 and 32-1 to the welding flange 3 mounted on the front plate 2 and the concrete containment wall 1 of the nuclear power plant. 3) Assemble the mounting bolt 33 to each mounting nut 35 inserted into the bolt using a spring washer 34, and then open the branch valve 45 to open the O-rings 32 and 32-1. Nitrogen gas is filled up to the portion so as to monitor leakage from the gas leakage monitoring system 70, and each end portion of the nitrogen gas filling pipe 31 is connected to the plug bolt 36 by an O-ring 37. Electric through-hole assembly with a pressure maintenance monitoring, characterized in that having a structure by applying a seal. The method of claim 6, The branch valve 45 passes through the conduit 60 between the O-rings 32 and 32-1 to the filling conduit 31 of the front plate 2, and opens the valve seat 47 of the conduit valve rod 48. The electrical through-assembly assembly having a pressure maintaining monitoring function, characterized in that configured to open and close forward and backward by screw rotation in the state that the outside and airtight is maintained by the O-ring (49) mounted on the circumferential surface.