JPS61273115A - Cable piercing section for nuclear reactor housing equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a cable penetration part of a nuclear reactor containment facility, and is particularly suitable for passing a cable through a shielding wall of a reactor containment vessel, a reactor building, etc. This is related to the cable passage section.

[Background of the invention]

When cables for electrical control systems and measurement systems pass through the shielding walls of nuclear reactor facilities, it is necessary to take sufficient care to prevent radioactivity from leaking from the cable penetrations. In order to prevent this, the inside of the cable penetration part was filled with a botting material such as epoxy resin to ensure airtightness and prevent radioactivity from leaking. However, with this method, airtightness can be maintained sufficiently in an atmosphere at room temperature, but if a fire or the like occurs in the room where the cable passes through, the cable penetration part will be exposed to abnormally high temperatures and the bot may be damaged. There was a risk that the airtight performance of the material would deteriorate.

As a means for preventing the deterioration of airtightness due to such abnormal high temperatures, one method has been proposed, for example, as shown in Japanese Utility Model Application Publication No. 55-109898.

In this conventional example, as shown in FIG. 8, a fireproof wall 25 through which a fireproof cover 23 and a cable 24 are passed is provided at both ends 22 of a penetration part main body 210, and an airtight filler 26 is provided in the gap between the fireproof wall 25 and the goople 24. The filling is intended to improve heat resistance. According to this cable penetration structure.

Although it can improve heat resistance compared to the conventional # structure mentioned above,
If a fire or the like lasts for a long time, there is a concern that the performance of the airtight filler 26 will deteriorate, and if it is installed in a highly radioactive environment near the reactor body, it cannot be ensured.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to improve heat resistance, radiation resistance, and airtightness,
The object of the present invention is to provide a cable penetration part for a nuclear reactor containment facility with excellent safety.

[Summary of the invention]

In order to achieve the above object, the present invention provides a cable penetration section in which a main body of the cable penetration section is provided in a shielding wall of a nuclear reactor containment facility, and a cable is passed through both end plates of the penetration section main body. The penetrating cable is passed through an end plate on either side of the cable penetrating portion to be penetrated and supported via a seal welding means, and the penetrating cable is passed through the other end plate in an unjoined state, and A shielding material filling chamber filled with a shielding material is formed inside the cable penetration part main body, and a gas for leak detection is introduced between this shielding material filling chamber and the end plate to which the cable is cool welded. It forms a chamber for leak testing.

According to this means, it is possible to seal between the penetrating part main body and the penetrating cable by the welding means, and to prevent leakage of radioactivity via the sealing means and the shielding member. In addition, since the cable is seal welded to one end plate of the cable penetration part and the cable is passed through the other end plate without being joined, the cable is supported through the so-called one-side seal welding structure. Even if there is a temperature difference or a thermal expansion difference between the main body of the penetration part, the cable, etc., 1. This thermal expansion difference can be absorbed,
The integrity of the seal weld can be ensured without imparting mechanical strain to the seal weld due to thermal expansion differences.

In addition, in the unlikely event that a defect occurs in the cool weld, if a leak detection gas is introduced into the chamber of the cable penetration part, this gas will leak from the defect in the seal weld. By detecting with a blower, it is possible to inspect and confirm the presence or absence of leakage at the seal weld.

[Embodiments of the invention]

FIG. 1 shows a first embodiment of the present invention. In the figure, P is a shielding wall (partition wall) that constitutes a mutually independent atmosphere in the reactor building, and the appropriate position of the shielding wall P is The position is busy,
Cable penetration body (below)

A penetrating portion body (1) is provided with one end thereof seal-welded to a shielding wall P (2). In addition, for the first penetration part wood l, the end plates 3, 3' on both sides and the inside of the penetration part main Kl are penetrated <M
A large number of cables 4, 4, etc., such as I cables, are attached. The mounting structure for the cable 4 is such that a sleeve 5 is provided on one end plate 3 of the main body 1 of the penetration part, and the cable 4 is passed through the entire sleeve 5. Sleeve 5 is end plate 3
It is attached to the inner surface of the housing by seal welding 6 on one side.

The cable 4 is supported in a joined state by being welded to one side of the sleeve 60. On the other hand, a cable 4 is passed through and supported in the other end plate 3' of the main body 1 of the first through-hole 8 without any mechanical joining such as welding.

Further, inside the main body 1 of the first penetration part, a shielding material filling chamber 10 with a wide space and a chamber 11 for leakage testing with a narrow space are defined via a partition plate 9t.

The shielding material filling chamber IO is filled with a shielding material 12 that shields radioactivity. Further, in the shielding material filling chamber 10, a shielding material 12 is provided.
A sleeve 13 for passing a cable through the inside is attached by welding 14 to the partition plate 9 at one end, and this sleeve 1
The cable 4 is inserted into the sleeve 13t-
The cable 4 passes through the shielding material 12 without being joined.

A leakage test chamber 11 is formed between the end plate 3 and the partition plate 9 to which the cable 4 is 7-welded. It is configured so that a gas for inspection is introduced. 16
is a valve provided in a part of the detection gas introduction pipe 15.

In this cable penetration structure, 1 penetration part main body 1.
Sleeve 5. Metal materials, inorganic materials, and the like with excellent heat resistance and radiation resistance are used for each component such as the seal welds 6 and 7.

Next, the operation of this embodiment will be explained.

In this example, the installation location of the main body 1 of the penetration part, the cable penetration location, etc. are sealed by welding 2. 6. The airtightness is maintained through various welding means such as No.7. The seal welding structure is such that 1 the penetration part body 1 and the shielding wall 21, the end plate 3 on one side of the penetration part body 1 and one end of the sleeve 5, and the other end of the sleeve 5 and a part of the cable 4 are sealed on one side 2 and 6, respectively. .7, and the remaining parts of these constituent members are in an unjoined state.
Even if a temperature difference, or even a difference in thermal expansion, occurs in each component during normal times or during abnormally high temperatures such as a fire, these differences in thermal expansion are absorbed and the penetration part main body 1, shielding wall 21, penetration part main body 1, and sleeve 5. Seal welding of sleeve 5 and cable 4 2, 6.
7 etc. to prevent mechanical distortion from occurring.

Furthermore, 1 penetration part main body 1. Sleeve 5. Seal weld parts 2, 6
．． Grade 7 uses metal or inorganic materials with excellent heat resistance and radiation resistance, so they are exposed to high temperatures.

It can provide cooling and radiation shielding functions even under abnormal atmospheres such as high pressure.

In addition, in this embodiment, if the soundness of the sealing function of the cable penetration part is lost, or if you want to inspect or confirm the soundness of the sealing function of the cable penetration part, the primary It can be inspected and confirmed in this way. This soundness confirmation method will be explained based on FIG. In FIG.

17 is a cover for gas detection, 18 is a gas ejection probe provided inside the cover 17, and 19 is a gas detector. When inspecting the health, cover 17 is connected to cable 5t-
Attach in a sealed manner to the seal-welded end plate 3 side. then 1
The atmospheric pressure on the other end plate 3' side of the penetrating portion main body 1 is made slightly higher than the internal pressure of the chamber 11 on the end plate 3 side. In this state, the valve 16 is opened and a leak detection gas such as helium gas or Freon gas is blown into the chamber 11 through the gas introduction pipe 1st. Cable seal welding parts 6, 7 of penetration part main body 1
If there is a defect in the seal boundary, the leak detection gas will leak into the cover 17, so if there is a gas leak, it will be detected by the probe 18 after a specified time has elapsed, and the detector 19 will check the integrity of the seal boundary. The presence or absence can be detected and confirmed.

According to this embodiment, the following effects are achieved.

(1) The seal boundary of the cable penetration part is heat resistant.

Due to the radiation-resistant seal welding.

It is possible to provide a cable penetration part that can be used even in high temperature and high radiation environments.

(2) Also, each of the 7 welded parts of the cable penetration part has a one-sided seal welded structure, so that it is possible to absorb the difference in thermal expansion caused by the temperature difference of each component.

There is no mechanical distortion caused by temperature differences in each seal welding part, and the sealing performance is excellent, and it can be implemented without having to make the structure multi-layered.

(3) Furthermore, it is possible to inspect and confirm the leakage of the 7-le boundary of the cable penetration part with a simple structure, and the reliability can be improved.

(4) Furthermore, in this structure, since the sleeve 5 for cable penetration and the cable 4 are welded on the outside of the end plate 3, the end plate 3 and the sleeve 5, the end plate 3 and the penetration part main body l, After sequentially assembling and welding the cable insertion and communication slit + H block 13, the partition plate 9, and the partition plate 9 and the penetration part body 1, the shielding material 12f is filled.

After that, the cable penetration part can be assembled by attaching the cable 4 to the penetration part main body 1 and attaching the end plate 3' to the penetration part main body IK.The assembly is easy and the assembly work 2 is greatly improved. be able to.

FIG. 2 shows a second embodiment of the present invention. In the figure, the same reference numerals as in the above embodiment indicate the same parts. This example uses X IJ-pu 5t- for cable penetration.
The cable 4 is drawn into the inside of the penetration part main body 1 (inside the chamber 11), and one end of the sleeve 5 is seal-welded 6 to the outside of the end plate 3, and the cable 4 and one end of the sleeve 5 are seal-welded 7 inside the chamber 11. It is something that you have.

According to this example, the sleeve 5 for cable penetration can be drawn into the interior of the penetration part main body 1.

The total length of the cable 4 is shortened, and the space for arranging the cable in the cable penetration portion can be reduced. In addition, the structure of the cable penetration part in this example is as follows.

After welding 6 the end plate 3 and cable penetration sleeve 5,
Welding of sleeve 5 and cable 4 71! The other assembly steps are performed in the same manner as in the first embodiment.

3 and 4 show modifications of the embodiment described in FIGS. 1 and 3, respectively. In these embodiments, a cable inserted through the shielding material filling chamber 10 is shown. The general sleeve 13t is unique in that it is omitted. In this example, if the temperature difference between the various parts of the cable penetration part does not occur that much during normal times and in the event of an accident, a single cable structure may be adopted.

If such a structure is adopted, the structure of the cable penetration part can be greatly simplified.

FIG. 5 shows a fifth embodiment of the present invention.

In this example, the cable 4 and the cable penetration sleeve 5 are sealed and welded 7 via a bellows 50.

A sleeve 5 for passing a relatively short cable through the shielding material 12
1, seal weld 14 one end of the sleeve 51 to the partition plate 9, and connect the other end of the sleeve 51 to the cable 4.
This embodiment differs from the other embodiments in that it is welded on one side 52 in a shielding material filling chamber.

According to this example, a chamber 11 for leakage testing.

7-ru welds 6.7 and 14.52 can be formed in a sealed manner. Therefore, when inspecting the seal welds 6.7 and 14.52 for airtight leakage, it is necessary to use the There is no need to pressurize the other end plate 3'' of the penetrating part main body 1 more than the end plate 3 side in advance, and the work process of inspecting and confirming the soundness of the seal weld 6.7 is omitted.

This type of inspection and confirmation work can be made more efficient. Further, when a temperature difference occurs between the cable 4 and the penetration part main body 1 and a difference in thermal expansion occurs between the two, this difference in thermal expansion is absorbed by the bellows 50, so that the seal welds 6, 7.
Sealing performance can be maintained without mechanical distortion such as cracks occurring in the parts 52 and the like.

FIG. 7 shows a modification of the leakage inspection and confirmation method for the cable penetration section shown in FIG. Since the space in which leakage gas should be detected can be limited via the partition plate so1, the accuracy of IJ4 leakage detection can be further improved.

〔Effect of the invention〕

As described above, according to the present invention, the cable penetration part is sealed through a seal welding means that has heat resistance, radiation resistance, and absorbs the thermal expansion of the cable, so that it can be used in high radiation and high @ environment. It is possible to provide a highly safe and reliable cable penetration section because it can demonstrate excellent sealing function even under the .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a second embodiment of the invention, FIG. 3 is a longitudinal sectional view showing a third practical example of the invention, and FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the invention. Figure 5 shows fi5 of the present invention.
There are longitudinal cross-sectional views showing the embodiment, FIG. l... Cable penetration main body, 3, 3'... End plate, 4
・Cable, 5... Sleeve, 6, 7... Seal welding. 10... Shielding material filling chamber, 11... Leakage inspection channel (. 12... Shielding material, 13... Sleeve for cable insertion. 50... Bellows, 51... Sleeve for cable insertion. (1 other person)

Claims (1)

[Scope of Claims] 1. A cable that passes through and supports the cable in a cable penetration section that is formed by providing a main body of the cable penetration section in a shielding wall of a nuclear reactor containment facility and passing the cable through both end plates of the main body of the penetration section. The penetrating cable is passed through an end plate on either side of the penetrating part via a seal welding means, and the penetrating cable is passed through the other end plate in an unjoined state, and further, the cable penetrating part A shielding material filling chamber filled with shielding material is formed inside the main body, and a leakage detection gas is introduced between this shielding material filling chamber and the end plate to which the cable is seal-welded. A cable penetration in a nuclear reactor containment facility that forms a chamber. 2. In claim 1, the means for sealing and welding the cable includes fitting a sleeve for penetrating the cable onto the cable, welding one side of the cable to one end of the sleeve, and welding the cable to the other end of the sleeve. A cable penetration part for a nuclear reactor containment facility, the cable penetration part being constructed by welding on one side to one end plate of the cable penetration part main body. 3. In claim 1 or 2, the shielding material filling chamber is provided with a cable insertion sleeve in the shielding material, and the through cable is passed through the cable insertion sleeve. Cable penetration in reactor containment facility. 4. In claim 2, one end of the sleeve and the cable are seal-welded via a bellows interposed between the sleeve and the cable, and the cable is inserted into the shielding material filling chamber. A cable penetration part of a nuclear reactor containment facility, which is provided with a sleeve for sealing and welding one end of the sleeve to the cable.