JP6709482B1 - Fiber optic penetration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber penetration which is easy to manufacture and has a small diameter. SOLUTION: A first relay member 13a and a second relay member 13b having connector parts 24 provided on both ends of a ferrule 21 having a built-in fiber 22 are attached to a first end and a second end of a penetration tube 12, respectively. ing. The first end of the internal optical fiber 15 is connected to the connector portion of the first relay member by the first internal connector 14a, and the second end of the internal optical fiber is connected to the connector portion of the second relay member by the second internal connector 14b. ing. The first optical fiber cable 6 and the second optical fiber cable 7 in which the optical fiber strand 34 is inserted into the metal thin tube 33 are respectively connected by the first cable connector 16 and the second cable connector 17 to the first relay member, 2 Connected to the connector part of the relay member. [Selection diagram] Figure 3A

Description

TECHNICAL FIELD The present invention relates to an optical fiber penetration for connecting a cable that extends to the outside and inside of a partition wall by penetrating a partition wall of a container, equipment, or room that needs to be isolated from inside and outside, such as a reactor containment vessel.

As a conventional penetration structure, for example, in Patent Document 1, a header ring is provided through an adapter at an outer tip of a sleeve that is provided so as to penetrate through a shielding wall of a reactor containment vessel, and the header ring is attached to the header ring. A penetration is described in which a plurality of cable modules are mounted, an outer cable of the cable module is connected to an external cable via a terminal portion, and an inner cable of the cable module is connected to an internal cable via a terminal portion. When replacing the penetration, cut the adapter-sleeve weld and replace the cable module with the adapter with a new one.

Since the recent nuclear accident in Japan, it has been required to strengthen safety monitoring equipment and measuring equipment in the reactor containment vessel. Conventionally, in Japan, the use of an optical fiber for transmitting measurement data of temperature and water level in a reactor containment vessel has not been adopted due to the problem of radiation resistance of the optical fiber.

In recent years, radiation-resistant fibers have been developed, but with the development of hydrogen detection sensors, temperature sensors, water level sensors, and other measuring instruments that are compatible with such radiation-resistant fibers, pressure resistance, airtightness, heat resistance, and resistance It is desired to develop a fiber optic penetration of the containment bulkhead of a radioactive containment vessel.

However, the radiation resistant fiber has a resin coating itself lacking in heat resistance and pressure resistance, cannot be used as it is as a penetration, and is liable to be broken with only a fiber element wire and has no durability. In order to adopt the radiation resistant fiber as the penetration of the shielding wall of the reactor containment vessel, it is first necessary to ensure the airtightness and durability.

The applicant of the present application, in Patent Document 2, uses an optical fiber cable in which an optical fiber wire is inserted into a metal thin tube, and connects the first optical fiber cable and the second optical fiber cable to an internal connector inside the optical fiber penetration. We propose optical fiber penetration connected by. This optical fiber penetration is excellent in pressure resistance, airtightness, heat resistance, radiation resistance and water resistance, but due to the presence of a partition plate and resin filling, it is not easy to manufacture and it is difficult to reduce the diameter. Was becoming. Further, the internal connector is present in the central portion of the optical fiber penetration, is unstable in strength, has a complicated structure, and is poor in reliability.

JP 2004-157050 A International publication WO2016/021659

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an optical fiber penetration that is easy to manufacture, has a small diameter, and has high reliability.

In order to solve the above problems, the optical fiber penetration of the present invention,
In an optical fiber penetration arranged inside a sleeve provided through a partition wall that separates the first space and the second space,
A first relay member and a second relay member having connector portions provided on both end sides of a ferrule having a built-in fiber are attached to the first end and the second end of the penetration tube, respectively.
A first end of an internal optical fiber disposed inside the penetration tube is connected to the connector portion of the first relay member by a first internal connector, and a second end of the internal optical fiber is connected by a second internal connector. Connected to the connector portion of the second relay member,
A first optical fiber cable in which an optical fiber element wire is inserted into a metal thin tube is connected to the connector portion of the first relay member by a first cable connector,
A second optical fiber cable in which an optical fiber element wire is inserted into a metal thin tube is connected to the connector portion of the second relay member by a second cable connector.

The internal optical fiber is an optical fiber strand.

The optical fiber strand of the internal optical fiber is inserted into a protective tube.

The penetration pipe includes a first pipe, a second pipe, and a third pipe that is disposed inside the first pipe and the second pipe and is longer than a distance between the first pipe and the second pipe. It is composed of a half pipe attached between the first pipe and the second pipe.

The inside of the thin tube of the first optical fiber cable in the first space and the inside of the thin tube of the second optical fiber cable in the second space are the first relay member, the inside of the penetration tube, and the second Blocked by the relay member,
The optical fiber strand of the first optical fiber cable in the first space and the optical fiber strand of the second optical fiber cable in the second space are the built-in fiber of the ferrule of the first relay member, the inside of the penetration tube. The internal optical fiber and the built-in fiber of the ferrule of the second relay member are electrically connected.

The internal optical fiber is supported on the inner surface of the penetration tube by a supporting member.

Further, in order to solve the above problems, the optical fiber penetration of the present invention,
In an optical fiber penetration arranged inside a sleeve provided through a partition wall that separates the first space and the second space,
A relay member provided with connector parts on both ends of a ferrule having a built-in fiber is attached to the middle part of the penetration tube,
One end of the first internal optical fiber disposed inside the penetration tube is connected to the connector portion of the relay member by a first internal connector, and the other end of the first internal optical fiber is the first end of the penetration tube. Is connected to the first external connector by penetrating the first lid provided on the
One end of the second internal optical fiber disposed inside the penetration tube is connected to the connector portion of the relay member by a second internal connector, and the other end of the second internal optical fiber is the second end of the penetration tube. Is connected to the second external connector through the second lid provided on the
A first optical fiber cable in which an optical fiber element wire is inserted into a metal thin tube is connected to the first external connector by a first cable connector,
A second optical fiber cable in which an optical fiber wire is inserted in a metal thin tube is connected to the second external connector by a second cable connector.

The first internal optical fiber and the second internal optical fiber are obtained by inserting an optical fiber strand into a metal thin tube.

The inside of the first optical fiber cable in the first space and the thin tube of the first internal optical fiber, and the inside of the second optical fiber cable in the second space and the thin tube of the second internal optical fiber are Blocked by the relay member,
The first optical fiber cable in the first space and the optical fiber strand of the first internal optical fiber, and the second optical fiber cable in the second space and the optical fiber strand of the second internal optical fiber Is conducted by the built-in fiber of the ferrule of the first relay member.

A plurality of the internal optical fibers are arranged in the penetration tube.

Of the first optical fiber cable and the second optical fiber cable, at least the first optical fiber cable is provided with a shield braid and a sheath outside the thin tube into which the optical fiber element wire is inserted.

According to the present invention, since the relay member having the connector portions provided on both end sides of the ferrule having the built-in fiber is attached to the penetration tube, it is only necessary to connect the cable connector of the optical fiber cable to the connector portion of the relay member. Because it is good, optical fiber penetration is easy to manufacture. Further, since the relay member only needs to have a diameter for providing the connector portion, the optical fiber penetration can be made small in diameter. Furthermore, since the internal connector is connected to the relay member, it has the effects of being stable, having high strength, and improving reliability.

The perspective view which shows the state which installed the optical fiber penetration which concerns on embodiment of this invention in the partition of a reactor containment vessel. The front view of the optical fiber penetration which concerns on 1st Embodiment. FIG. 3 is a partially cutaway enlarged sectional view of the optical fiber penetration of FIG. 2. The partial fracture|rupture expanded sectional view (a) of the modification of the optical fiber penetration of FIG. 2, and its partial expanded sectional view (b). The side view of a relay member. Sectional drawing of an internal connector. FIG. 3B is a partially enlarged cross-sectional view of the optical fiber penetration of FIG. 3A. Sectional drawing of the relay member in the VII-VII arrow line of FIG. Sectional drawing of the optical fiber cable in the VIII-VIII line cross section of FIG. Sectional drawing which shows the state which assembles the optical fiber penetration of FIG. 3A. The front view of the optical fiber penetration which concerns on 2nd Embodiment. FIG. 11 is a partially cutaway enlarged sectional view of the optical fiber penetration of FIG. 10. FIG. 12 is a partially enlarged cross-sectional view of the optical fiber penetration of FIG. 11. Sectional drawing which shows the state which assembles the optical fiber penetration of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, an optical fiber penetration 1 of the present embodiment penetrates a partition wall 2 of a reactor containment vessel and is shown in a left side (inside the partition wall 2) inside the containment vessel (first space) 3 in FIG. It is arranged in a cylindrical sleeve 5 that communicates with the storage container outer space (second space) 4 on the middle right side (outside the partition wall 2 ). In this specification, for convenience, the inside of the reactor containment vessel and the outside of the reactor containment vessel of each member are simply referred to as the inside and the outside.

The optical fiber penetration 1 is connected to an inner optical fiber cable 6 connected to a sensor (not shown) installed in the inner space 3 of the storage container, and a reader (not shown) installed in the outer space 4 of the storage container. And the outer optical fiber cable 7 to be connected.

The optical fiber penetration 1 extends from the inner space 3 of the storage container to the outer space 4 of the storage container along the axial direction of the sleeve 5. The optical fiber penetration 1 is inserted through and supported by both ends of the sleeve 5 and circular holes 9 of a support body 8 provided at the center in the axial direction. Although only one optical fiber penetration 1 is shown as a representative in FIG. 1, a plurality of optical fiber penetrations 1 and electric penetrations are actually provided in the sleeve 5. The inner optical fiber cables 6 are gathered together with other cables in an inner junction box 10 attached to the inner end of the sleeve 5, and are connected to the respective penetrations. Similarly, the outer optical fiber cable 7 is also gathered together with other cables in the outer connection box 11 attached to the outer end of the sleeve 5, and is connected to each penetration.

Next, an embodiment of the optical fiber penetration 1 will be specifically described.

<First Embodiment>
As shown in FIGS. 2 and 3A, the optical fiber penetration 1 according to the first embodiment includes a penetration tube 12, a first relay member 13a, a second relay member 13b, a first internal connector 14a, and a second internal member. The connector 14 b, the internal optical fiber 15, the inner cable connector 16, and the outer cable connector 17 are provided.

The penetration pipe 12 is made of metal such as stainless steel, and includes a first pipe 12a, a second pipe 12b, a third pipe 12c, and a half pipe 12d. The first pipe 12a and the second pipe 12b have the same diameter and length, and are arranged on the same axis center line with a predetermined distance therebetween. The third pipe 12c has a smaller diameter than the first pipe 12a and the second pipe 12b so as to be arranged inside the first pipe 12a and the second pipe 12b. The length of the third pipe 12c is longer than the distance between the first pipe 12a and the second pipe 12b. The half pipe 12d has the same diameter as the first pipe 12a and the second pipe 12b, and has the same length as the distance between the first pipe 12a and the second pipe 12b. The half pipe 12d is arranged between the first pipe 12a and the second pipe 12b, and both longitudinal end faces thereof are welded to the ends of the first pipe 12a and the second pipe 12b, and face each other. The circumferential end surfaces are welded to each other so as to be attached between the first pipe 12a and the second pipe 12b.

The outer diameter of the penetration tube 12 is about 25.4 mm (1 inch), although it depends on the number of internal optical fibers 15 (usually three) inserted through the inside and the size of the internal connector 14. The length of the penetration tube 12 depends on the length of the sleeve 5 in which the optical fiber penetration 1 is arranged, that is, the thickness of the partition wall 2, but is about 1000 to 3000 mm.

Gas penetration detection holes 12e are formed in the penetration pipe 12 at appropriate places. The gas leak detection hole 12e is connected to a pressure gauge (not shown) provided inside or outside via a conduit (not shown), and inside the penetration pipe 12 due to damage to the thin pipe 33 or the penetration pipe 12 of the optical fiber cables 6 and 7 described later. It detects the change in the pressure.

As shown in FIG. 4, the first relay member 13a is attached to the first end of the penetration pipe 12, that is, the first pipe 12a by welding. The first relay member 13a is a cylindrical member made of stainless steel having the same outer diameter as the outer diameter of the first pipe 12a. The first relay member 13a includes an outer main body 18 having a recess 18a and an inner main body 19 fitted into the recess 18a of the outer main body 18 and fixed with a screw (not shown). There are three fixed ferrules 21 (only one is shown in FIG. 4) in the small-diameter holes 20a and the large-diameter holes 20b that are formed in the axial direction at three equidistant positions in the circumferential direction of the first relay member 13a and communicate with each other. Are inserted parallel to the longitudinal direction so as not to interfere with each other. Each fixed ferrule 21 is prevented from coming off from the large diameter hole 20b to the small diameter hole 20a by the large diameter portion 21a provided on the outer circumference. A built-in fiber 22 is provided inside each of the fixed ferrules 21 by bonding, and both ends are polished smoothly.

An O-ring 23 is attached to the outer periphery of each fixed ferrule 21. The O-ring 23 is located between the bottom surface of the concave portion 18a of the outer body 18 and the counterbore 19a of the inner body 19, and maintains airtightness between the outer body side and the inner body side of the outer peripheral surface of the fixed ferrule 21. ing. As the O-ring 23, a fluorine-based resin having heat resistance and pressure resistance, such as Kalrez (registered trademark) or Viton (registered trademark), is preferable.

Female connectors 24 to which a first internal connector 14a and a first cable connector described later are attached are provided at both ends of each fixed ferrule 21. The female connector portion 24 has a sleeve 25 in which the fixed ferrule 21 is inserted up to an intermediate portion, and a cylindrical portion 26 in which a male screw 26a is formed. The sleeve 25 and the cylindrical portion 26 of the female connector portion 24 are fixed to the outer main body 18 by the cover 18b, and are fixed to the inner main body 19 by the cover 19b.

The second relay member 13b is attached to the second end of the penetration pipe 12, that is, the second pipe 12b by welding. Since the second relay member 13b has the same configuration as the first relay member 13a, the same reference numerals are given to corresponding portions. And the description is omitted.

The first relay member 13a and the second relay member 13b were confirmed for vacuum leak resistance, heat resistance, and pressure resistance by a helium leak test, a heat resistance test, and a pressure resistance test.
In the helium leak test, helium was sprayed on one end of the relay member, and a helium leak detector (HELEN, M-222LD manufactured by Canon) was connected to the other end of the relay member to leak within 5.5×10 ⁻⁹ Pa·M ³ /S. I confirmed the sex.
In the heat resistance test, at 200° C. for 30 minutes at 1 dB or less (1300 nm), a light source is connected to one end of the relay member via a single mode optical fiber, and a power meter is connected to the other end via a single mode optical fiber. While being irradiated with light (λ=1300 nm) from a light source, it was placed in a constant temperature thermostatic chamber (NDO-400 manufactured by Tokyo Rika Kikai Co., Ltd.) and heated at 200° C. for 30 minutes to attenuate the light before and after heating. It was confirmed that the amount was 1 dB or less.
In the pressure resistance test, a tube was connected to one end of the relay member, the tip of the tube was immersed in water, a pump was connected to the other end of the relay member, and pressure was applied at 1000 kPa to confirm that no bubbles were generated in the water. did.

As shown in FIG. 5, the first internal connector 14a is connected to the female connector portion 24 inside the first relay member 13a, and includes a ferrule 27, a fixed housing 28, a movable housing 29, and a mounting nut 30. And an FC connector of a screw tightening type including a spring 31.

The ferrule 27 is made of resin, metal, ceramic, or the like, has a cylindrical shape into which an internal optical fiber 15 to be described later is inserted and fixed, and the end surface of the first relay member 13a facing the fixed ferrule 21 is smoothly polished. ing. The ferrule 27 has a large diameter portion 27a, and a positioning recess 27b is formed in the large diameter portion 27a.

The fixed housing 28 has a cylindrical shape including a front portion 28a inserted between the sleeve 25 and the cylindrical portion 26 of the first relay member 13a, a rear portion 28b, and a large-diameter intermediate portion 28c. A female screw 28d is formed on the rear portion 28b of the fixed housing 28. On the inner peripheral surface of the fixed housing 28, a stopper 28e with which the large diameter portion 27a of the ferrule 27 abuts, and a positioning protrusion 28f that engages with the positioning recess 27b of the ferrule are formed.

The movable housing 29 has a cylindrical shape including a front portion 29a, a rear portion 29b, and a large-diameter intermediate portion 29c. In the front portion 29a of the movable housing 29, a male screw 29d that is inserted into the rear portion 28b of the fixed housing 28 and is screwed into the female screw 28d of the fixed housing 28 is formed on the outer surface, and a spring accommodating portion 29e is formed on the inner surface. There is. A rear surface 29b of the movable housing 29 is formed with a two-sided portion 29f with which a tool for rotating the movable housing 29 is engaged.

The mounting nut 30 has a cylindrical shape into which the fixed housing 28 and the movable housing 29 are inserted, and includes a front portion 30a, a rear portion 30b, and an inner peripheral flange portion 30c. The front portion 30a of the mounting nut 30 is formed with a female screw 30d that is screwed into the male screw 26a of the cylindrical portion 26 of the female connector portion 24 of the first relay member 13a. A washer 30e is fitted between the inner peripheral flange portion 30c and the rear end surface of the intermediate portion 28c of the fixed housing 28.

The spring 31 is inserted in the spring housing portion 29e of the movable housing 29. The spring 31 has a front end abutting against the large-diameter portion 27a of the ferrule 27 and a rear end abutting against a rear end surface of the spring accommodating portion 29e so as to bias the ferrule 27 against the ferrule 27 of the first relay member 13a. doing.

The second internal connector 14b is connected to the female connector portion 24 inside the second relay member 13b and has the same configuration as the first internal connector 14a. The description is omitted.

As shown in FIG. 6, the internal optical fiber 15 is arranged inside the penetration tube 12 in the form of a strand, and as shown in FIG. 7, is composed of three optical fibers. The first end of each internal optical fiber 15 is connected to the first internal connector 14a, and the first internal connector 14a is connected to the female connector portion 24 of the first relay member 13a. The second end of each internal optical fiber 15 is connected to the second internal connector 14b, and the second internal connector 14b is connected to the female connector portion 24 of the second relay member 13b. In order to protect the mounting portions of the internal optical fiber 15 to the first internal connector 14a and the second internal connector 14b, a protective tube 32 is provided at the rear portion 29b of the movable housing 29 of the first internal connector 14a and the second internal connector 14b. It is installed. The protection tube 32 may be provided over the entire length of the internal optical fiber 15.

The inner cable connector 16 and the outer cable connector 17 are connected to the female connector portions 24 on the outer sides of the first relay member 13a and the second relay member 13b, and have the same shape as the first internal connector 14a and the second internal connector 14b. Therefore, the same reference numerals are given and description thereof is omitted.

The inner optical fiber cable 6 is connected to the inner cable connector 16, and a sensor (not shown) is connected to the tip of the inner optical fiber cable 6. The outer optical fiber cable 7 is connected to the outer cable connector 17, and a reader (not shown) is connected to the tip of the outer optical fiber cable 7. Thereby, the sensor and the reader can be easily connected via the inner optical fiber cable 6, the inner cable connector 20, the optical fiber penetration 1, the outer cable connector 17, and the outer optical fiber cable 7.

As shown in FIG. 8, each of the inner optical fiber cable 6 and the outer optical fiber cable 7 includes a thin tube 33 made of stainless steel and an optical fiber element wire 34 inserted in the thin tube 33.

The thin tube 33 is preferably a stainless steel tube having the following characteristics.
Material: SUS304 (or SUS316)
Outer diameter/wall thickness: 2.0±0.05mm/0.2±0.05mm
Allowable tension; 216N
Allowable lateral pressure: 20,000N/50mm
Operating temperature; normal temperature to 200°C
Further, as the thin tube 33, an OCC cable manufactured by OCC, in which the outside of the SUS tube is protected by a SUS mesh wire, may be used.

The optical fiber element wire 34 is the element wire of the radiation resistant optical fiber of Japanese Patent No. 4699267, which is formed by coating a F-SiO ₂ fiber (fluorine-added about 0.8%) with a polyimide resin to generate defects due to radiation. A radiation resistant single mode fiber (RRSMFB) having a function of suppressing and repairing and having the following characteristics is preferable.
Cladding diameter: 125±1μm
Used wavelength nm: 1310, 1550
Initial transmission loss: ≤0.5 dB/km
Pressure test; ≧0.7GN/m ²
Heat resistance temperature: 300°C
γ-ray irradiation transmission loss; 1×10 ⁶ R/h about 0.5 dB/100 m
1x10 ⁵ R/h About 0.3 dB/100m
Further, the optical fiber strand 34 may be not only a single mode fiber but also a multimode fiber.

As shown in FIG. 8, the inner optical fiber cable 6 and the outer optical fiber cable 7 are provided with a shield braid 35 composed of a thin wire wound around a thin tube 33, and a polyether ether coated on the shield braid 35. And a sheath 36 made of a ketone (PEEK) resin.

In order to prevent the internal optical fibers 15 from interfering with each other or abutting against the inner surface of the penetration tube 12 to be damaged or broken by vibration caused by the sagging of the intermediate portion of the internal optical fiber 15, as shown in FIG. 3B, It is preferable to provide a support structure that supports the intermediate portion of the internal optical fiber 15. The support structure of the internal optical fiber 15 includes a support tube 37 made of stainless steel, into which the three internal optical fibers 15 having the protection tubes 32 attached are inserted, and the support tube 37 inside the third pipe 12c. It is composed of two supporting plates 38 for supporting.

The support pipe 37 has a length longer than that of the third pipe 12c and projects from both ends of the third pipe 12c. Screw holes 37a are formed at both ends of the support tube 37, and a support plate 38 inserted into the support tube 37 can be fixed by screwing a set screw 37b into the screw hole 37a.

The support plate 38 has a circular shape having an outer diameter that can be inserted into the inside of the third pipe 12c, and a through hole 38a into which the support pipe 37 is inserted is formed at the center. The support plate 38 has a screw hole 38b formed from the outer peripheral surface toward the through hole 38a, and a set screw 38c can be screwed into the screw hole 38b to be fixed to the support pipe 37.

The support structure including the support tube 37 and the support plate 38 suppresses the vibration of the internal optical fiber 15 and prevents the internal optical fiber 15 from being damaged or broken. Instead of using the support tube 37, the internal optical fiber 15 may be directly supported by passing through the through hole 38 a of the support plate 38.

Next, a method of manufacturing the optical fiber penetration 1 of the present invention and a method of attaching the partition wall 2 of the reactor containment vessel to the sleeve 5 will be described.

As shown in FIG. 9, the penetration pipe 12 is assembled by inserting the third pipe 12c between the first pipe 12a and the second pipe 12b. The penetration tube 12 can be expanded and contracted in the longitudinal direction. The three internal optical fibers 15 of a predetermined length are inserted into the penetration tube 12, and the first internal connector 14a is connected to the three internal optical fibers 15 protruding from the first end of the penetration tube 12 to connect the penetration tube 12 to the penetration tube 12. The second internal connector 14b is connected to the three internal optical fibers 15 projecting from the second end of 12.

Then, the first internal connector 14a is connected to the female connector portion 24 inside the first relay member 13a, and the second internal connector 14b is connected to the female connector portion 24 inside the second relay member 13b. The first pipe 12a of the penetration pipe 12 is slid and extended with respect to the third pipe 12c, and is welded to the first relay member 13a. Similarly, the second pipe 12b of the penetration pipe 12 is slid and extended with respect to the third pipe 12c, and is welded to the second relay member 13b.

Next, the half pipe 12d is attached between the first pipe 12a and the second pipe 12b of the penetration pipe 12, one end of the half pipe 12d is welded to the first pipe 12a, and the other end of the half pipe 12d is attached. The second pipe 12b is welded, and further, the opposing faces in the longitudinal direction of the half pipe 12d are welded.

To attach the new optical fiber penetration 1 manufactured as described above to the sleeve 5 of the partition wall 2 of the reactor containment vessel shown in FIG. 1, the optical fiber penetration 1 is inserted into the sleeve 5 from the outside of the reactor containment vessel. Then, the inner cable connector 16 is connected to the inner optical fiber cable 6, and the outer cable connector 17 is connected to the outer optical fiber cable 7, so that they can be easily attached. Further, the inner cable connector 16 and the outer cable connector 17 of the existing optical fiber penetration 1 are separated from the inner optical fiber cable 6 and the outer optical fiber cable 7, respectively, and the existing optical fiber penetration 1 is pulled out from the sleeve 5 to the outside. After the removal, a new optical fiber penetration 1 is inserted into the sleeve 5 from the outside of the reactor containment vessel, the inner cable connector 16 is connected to the inner optical fiber cable 6, and the outer cable connector 17 is connected to the outer optical fiber cable 7. By connecting, the optical fiber penetration 1 can be easily replaced.

The inner optical fiber cable 6 and the outer optical fiber cable 7 connected to the optical fiber penetration 1 of the present invention are heat-resistant and water-resistant while the radiation-resistant optical fiber element wire 34 remains as an element wire without a resin coating. Since it is inserted in the thin tube 33 having excellent properties, airtightness, earthquake resistance, and pressure resistance, the optical fiber element wire 34 is protected, and at the same time, it has pressure resistance, water resistance, heat resistance, and radiation resistance.

Further, in the optical fiber penetration 1 of the present invention, the inside of the thin tube 33 of the inner optical fiber cable 6 communicates with the inside of the fixed housing 28 and the movable housing 29 of the inner cable connector 16. However, the inside of the inner cable connector 16 is blocked from the inside of the penetration tube 12 by the O-ring 23 mounted between the fixed ferrule 21 of the first relay member 13 a, the outer main body 18, and the inner main body 19. There is. Further, the inside of the penetration tube 12 is blocked from the inside of the outer cable connector 17 by an O-ring 23 mounted between the fixed ferrule 21 of the second relay member 13b, the outer main body 18, and the inner main body 19. There is. Thus, between the inner optical fiber cable 6 and the outer optical fiber cable 7, the inner cable connector 16, the first relay member 13a, the first internal connector 14a, the penetration pipe 12, the second internal connector 14b, and the second internal connector 14a are provided. The relay member 13b and the outer cable connector 17 are present and are completely isolated from each other. Therefore, even if the thin tube 33 of the inner optical fiber cable 6 inside the nuclear reactor containment vessel is damaged, the outer optical fiber cable 7 outside the nuclear reactor containment vessel is discharged from the thin tube 33 in which the atmosphere or water inside the nuclear reactor containment vessel is damaged. Airtightness is maintained without invading. Furthermore, since the internal connectors 14a and 14b are connected to the relay members 13a and 13b at both ends of the penetration tube 12, the internal connectors 14a and 14b are stable, have high strength, and improve reliability.

Since the penetration pipe 12 is provided with the gas leak detection hole 12e, the O-ring 23 of the first relay member 13a and the second relay member 13b is worn or damaged, the first internal connector 14a or the second internal connector 14b is damaged, If there is a gas leak such as hydrogen or water vapor in the penetration pipe 12 due to damage to the penetration pipe 12 or the like, the change in pressure due to the leaked gas causes a gas leak detection pipe (not shown) connected to the gas leak detection hole 12e to be connected. Since it is detected via a pressure gauge or the like outside the optical fiber penetration 1 via the optical fiber penetration 1, it is possible to confirm the gas leakage quickly and reliably.

<Second Embodiment>
In the first embodiment, the first relay member 13a and the second relay member 13b are provided at both ends of the penetration pipe 12, but in the second embodiment, as shown in FIGS. The relay member 13 is attached to the.

That is, the penetration pipe 12 is composed of a first penetration pipe 12A and a second penetration pipe 12B. One end of the first penetration tube 12A is attached and closed by welding the first lid 41a, and the other end is attached to the relay member 13 by welding. Similarly, one end of the second penetration tube 12B is attached and closed by the second lid 41b by welding, and the other end is attached to the relay member 13 by welding.

The shape and structure of the relay member 13 are the same as those of the first relay member 13a and the second relay member 13b of the first embodiment, so the same reference numerals are given and the description thereof is omitted.

The first internal connector 14a and the second internal connector 14b are screw tightening type FC connectors connected to the female connector portions 24 on both sides of the relay member 13, and their shapes and structures are the same as those of the first embodiment. Since it is similar to the internal connector 14a and the second internal connector 14b, the same reference numerals are given and description thereof is omitted.

As shown in FIG. 12, the first internal optical fiber 42a and the second internal optical fiber 42b are made of a stainless steel thin tube similarly to the inner optical fiber cable 6 and the outer optical fiber cable 7 described in the first embodiment. 33 and an optical fiber element wire 34 inserted in the thin tube 33.

The end of the thin tube 33 on one end side of the first internal optical fiber 42a is attached to the movable housing 29 of the first internal connector 14a by welding, and the end of the optical fiber element wire 34 is attached to the ferrule 27 of the first internal connector 14a. Is stuck to. The other end side of the first internal optical fiber 42a penetrates the first lid 41a and is connected to the first external connector 43a.

Similarly, the end of the thin tube 33 on one end side of the second internal optical fiber 42b is attached to the movable housing 29 of the second internal connector 14b by welding, and the end of the optical fiber element wire 34 is attached to the second internal connector 14b. It is fixed to the ferrule 27. The other end side of the second internal optical fiber 42b penetrates the second lid 41b and is connected to the second external connector 43b.

Similar to the first embodiment, the first external connector 43a and the second external connector 43b are connected to the inner optical fiber cable 6 and the outer optical fiber cable 7 by the inner cable connector 16 and the outer cable connector 17, respectively. There is.

Next, a method of manufacturing the optical fiber penetration 1 of the second embodiment and a method of attaching the partition wall 2 of the reactor containment vessel to the sleeve 5 will be described.

As shown in FIG. 13, the first internal optical fiber 42a to which the first internal connector 14a is connected is inserted into the first lid 41a, and one end of the first penetration tube 12A is connected to the first lid 41a by welding. Then, the first internal connector 14 a of the first internal optical fiber 42 a is connected to the female connector portion 24 of the relay member 13. Then, the other end of the first penetration pipe 12A is connected to the relay member 13 by welding.

Similarly, the second internal optical fiber 42b connected to the second internal connector 14b is inserted into the second lid 41b, and one end of the second penetration tube 12B is connected to the second lid 41b by welding. Then, the second internal connector 14b of the second internal optical fiber 42b is connected to the female connector portion 24 of the relay member 13. Then, the other end of the second penetration pipe 12B is connected to the relay member 13 by welding.

The inner optical fiber cable 6 and the outer optical fiber cable 7, and the first inner optical fiber 42a and the second inner optical fiber 42b, which are connected to the optical fiber penetration 1 of the present invention, are covered with a resin having an optical fiber element wire 34 having radiation resistance. Since it is inserted in the thin tube 33 excellent in heat resistance, water resistance, airtightness, earthquake resistance, and pressure resistance in the state of the bare wire, the optical fiber wire 34 is protected and the pressure resistance, Water resistant, heat resistant, and radiation resistant.

Further, in the optical fiber penetration 1 of the present invention, the inside of the thin tube 33 of the first internal optical fiber 42a communicates with the inside of the fixed housing 28 and the movable housing 29 of the first internal connector 14a. However, inside the first internal connector 14a of the first penetration tube 12A, the second penetration tube is provided by the O-ring 23 mounted between the fixed ferrule 21 of the relay member 13, the outer main body 18, and the inner main body 19. It is cut off from the inside of 12B. Thus, between the inner optical fiber cable 6 and the outer optical fiber cable 7, the first outer connector 43a, the first lid 41a, the first inner optical fiber 42a, the first inner connector 14a, the relay member 13, The second internal connector 14b, the second internal optical fiber 42b, the second lid 41b, and the second external connector 43b are present, and are completely isolated from each other. Therefore, even if the thin tube 33 of the inner optical fiber cable 6 inside the nuclear reactor containment vessel is damaged, the outer optical fiber cable 7 outside the nuclear reactor containment vessel is discharged from the thin tube 33 in which the atmosphere or water inside the nuclear reactor containment vessel is damaged. Airtightness is maintained without invading. Furthermore, since the internal connectors 14a and 14b are connected to the relay member 13 in the central portion of the penetration tube 12, the internal connectors 14a and 14b are stable, have high strength, and improve reliability.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the first embodiment, the penetration pipe 12 of the optical fiber penetration 1 is composed of the three pipes of the first pipe 12a, the second pipe 12b, and the third pipe 12c, but it may be four pipes or more, or 2 pipes. It may be a single pipe or a single pipe.

INDUSTRIAL APPLICABILITY The present invention is not only applied to the field related to nuclear power for measurement, control, communication, maintenance, and water level measurement of fuel pool equipment of reactor containment equipment, but also research facilities such as common grooves, X-rays and accelerators, universities -It can also be applied to vessels and equipment that need to be isolated from inside and outside such as corporate research facilities, medical institutions, vacuum chambers, space equipment, and vacuum furnaces, and partition walls of rooms.

1 Optical Fiber Penetration 2 Partition 3 First Space 4 Second Space 5 Sleeve 6 Inner Optical Fiber Cable (First Optical Fiber Cable)
7 Outer optical fiber cable (second optical fiber cable)
12 Penetration pipe 12a 1st pipe 12b 2nd pipe 12c 3rd pipe 12d Half pipe 12e Gas leak detection hole 12A 1st penetration pipe 12B 2nd penetration pipe 13 Relay member 13a, 13b 1st, 2nd relay member 14a, 14b First and second internal connector 15 Internal optical fiber 16 Inner cable connector (first cable connector)
17 Outer cable connector (second cable connector)
21 fixed ferrule 22 built-in fiber 24 female connector portion 25 sleeve 26 cylindrical portion 27 ferrule 28 fixed housing 29 movable housing 30 mounting nut 31 spring 32 protective tube 33 thin tube 34 optical fiber wire 35 shield braid 36 sheath 37 support tube 37a screw hole 37b Set screw
38 Support plate 38a Through hole 38b Screw hole 38c Set screw
41a, 41b 1st, 2nd lid 42a, 42b 1st, 2nd internal optical fiber 43a, 43b 1st, 2nd external connector

Claims (12)

In an optical fiber penetration arranged inside a sleeve provided through a partition wall that separates the first space and the second space,
A first relay member and a second relay member having connector portions provided on both end sides of a ferrule having a built-in fiber are attached to the first end and the second end of the penetration tube, respectively.
A first end of an internal optical fiber disposed inside the penetration tube is connected to the connector portion of the first relay member by a first internal connector, and a second end of the internal optical fiber is connected by a second internal connector. Connected to the connector portion of the second relay member,
A first optical fiber cable in which an optical fiber element wire is inserted into a metal thin tube is connected to the connector portion of the first relay member by a first cable connector,
An optical fiber penetration, wherein a second optical fiber cable in which an optical fiber wire is inserted into a metal thin tube is connected to the connector portion of the second relay member by a second cable connector. The optical fiber penetration according to claim 1, wherein the internal optical fiber is an optical fiber strand. The optical fiber penetration according to claim 2, wherein the optical fiber strand of the internal optical fiber is inserted into a protective tube. The penetration pipe includes a first pipe, a second pipe, and a third pipe that is disposed inside the first pipe and the second pipe and is longer than a distance between the first pipe and the second pipe. The optical fiber penetration according to any one of claims 1 to 3, comprising a half-split pipe mounted between the first pipe and the second pipe. The inside of the thin tube of the first optical fiber cable in the first space and the inside of the thin tube of the second optical fiber cable in the second space are the first relay member, the inside of the penetration tube, and the second Blocked by the relay member,
The optical fiber strand of the first optical fiber cable in the first space and the optical fiber strand of the second optical fiber cable in the second space are the built-in fiber of the ferrule of the first relay member, the inside of the penetration tube. The optical fiber penetration according to any one of claims 1 to 4, wherein the internal optical fiber and the built-in fiber of the ferrule of the second relay member are electrically connected. 6. The optical fiber penetration according to claim 1, wherein the internal optical fiber is supported on the inner surface of the penetration tube by a supporting member. In an optical fiber penetration arranged inside a sleeve provided through a partition wall that separates the first space and the second space,
A relay member provided with connector parts on both ends of a ferrule having a built-in fiber is attached to the middle part of the penetration tube,
One end of the first internal optical fiber disposed inside the penetration tube is connected to the connector portion of the relay member by a first internal connector, and the other end of the first internal optical fiber is the first end of the penetration tube. Is connected to the first external connector by penetrating the first lid provided on the
One end of the second internal optical fiber disposed inside the penetration tube is connected to the connector portion of the relay member by a second internal connector, and the other end of the second internal optical fiber is the second end of the penetration tube. Is connected to the second external connector through the second lid provided on the
A first optical fiber cable in which an optical fiber element wire is inserted into a metal thin tube is connected to the first external connector by a first cable connector,
An optical fiber penetration characterized in that a second optical fiber cable in which an optical fiber wire is inserted into a metal thin tube is connected to the second external connector by a second cable connector. The optical fiber penetration according to claim 7, wherein the first internal optical fiber and the second internal optical fiber are optical fiber strands inserted into a metal thin tube. The inside of the first optical fiber cable in the first space and the thin tube of the first internal optical fiber, and the inside of the second optical fiber cable in the second space and the thin tube of the second internal optical fiber are Blocked by the relay member,
The first optical fiber cable in the first space and the optical fiber strand of the first internal optical fiber, and the second optical fiber cable in the second space and the optical fiber strand of the second internal optical fiber 9. The optical fiber penetration according to claim 7, wherein the optical fiber penetration is conducted by a built-in fiber of the ferrule of the relay member. The optical fiber penetration according to any one of claims 1 to 6, wherein a plurality of the internal optical fibers are arranged in the penetration tube. The optical fiber penetration according to any one of claims 7 to 9, wherein a plurality of the first internal optical fibers and the second internal optical fibers are arranged in the penetration tube. Of the first optical fiber cable and the second optical fiber cable, at least the first optical fiber cable has a shield braid and a sheath provided outside the thin tube into which the optical fiber element wire is inserted. The optical fiber penetration according to any one of claims 1 to 11.

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