JPS5887501A - Closed supporting device of optical fiber filament body - Google Patents

Abstract

PURPOSE:To obtain a closed supporting device which is excellent in elasticity by heat resistance and a temperature difference, by using a sealing base material whose thermal expansion coefficient is almost equal to that of an optical fiber, and also holding it by a flexible member, in the closed supporting device of the optical fiber. CONSTITUTION:On a closed supporting device of an optical fiber filament body, an end plate 9 fitted to the through-part of a vessel wall, for instance, an atomic pile storing vessel wall 11, and a concrete wall 12, a tube body 7 which has been fixed by piercing the end plate 9 and has inserted the optical fiber filament body 1 through the inside, a flexible member 6 which is fixed to the inside of this tube body and surrounds the optical fiber filament body 1, and a sealing element having a thermal expansion coefficient which is almost equal to that of the optical fiber filament body provided by sealing up a space between the other end of the flexible member 6 and the optical fiber filament body 1 are provided, by which it is possible to obtain the closed supporting device of the optical fiber filament body which causes no cracking of a sealing material nor drop of a sealing property.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an optical fiber strip that is attached to a wall penetration part of a reactor containment vessel, etc., to constitute an electric line extending inside and outside the vessel, and also to serve as an airtight maintenance part of the cough penetration part. The present invention relates to a body sealing support device.

The 11th daughter shows a conventional device of this type.

In the figure, (1) is the original fiber strand of an optical fiber cable or optical fiber link that penetrates the reactor containment vessel wall, etc., and (2) is the 7-piece fiber that is installed by closing the vessel wall penetration part. 72 member is provided with a through hole through which the optical fiber (1) is passed. (8) is the above 7 conch member (
A pipe (2) is inserted and supported in the through hole of (2) via a sealing material (4), and (6) improves the sealing performance of the optical fiber strip (1) inserted into this pipe (8). For this purpose, a sealing cool material is filled between the light 7 eyelid body (1) and the pipe (3).

The conventional device with such a sealing structure can prevent the optical fiber strands, which have lower mechanical strength than the organic cables currently widely used, from being damaged by external force loads, and It can also serve as a protection function for the seal portion surrounding the optical fiber strand.

However, since the commonly used sealing materials are made of epoxy resin or silicone resin, their heat resistance and elasticity due to temperature differences are beyond their control. For example, even with the seal structure as described above, when a temperature difference occurs in the axial and radial directions on the surface of the conch member (2), This results in an uneven thermal expansion difference between the 7-conk member (2), the pipe (3), and the optical fiber strip (1).
There was a risk that the thermal stress due to the above would act on the seal portion and cause the seal material to crack.

Furthermore, in places with high radiation levels, the device with the above structure absorbs radiation, and the absorbed energy causes a radiation-degraded dust phenomenon to occur in the structural material of the device, which reduces sealing performance. Rarely.

In view of the above points, the present invention provides a sealed support device for NFC and optical fibers that has excellent heat resistance and elasticity due to temperature differences, and uses a sealing element having almost the same coefficient of thermal expansion as that of the optical fiber. It is proposed that the comb be held by a flexible member.

The invention will now be described with reference to the illustrated embodiments.

In FIG. 2, (1) is an optical fiber strip, and (6) is a combustible member provided surrounding this optical fiber strip.
It is made of a metal such as Kovar, which has a coefficient of thermal expansion similar to that of the optical fiber (1), and has a cylindrical shape with one end having a small diameter and the other end having a large diameter. This flexible member (6) is inserted into the tube body (γn), and the outer circumferential surface of its large diameter portion is in contact with the inner circumferential surface of the tube body (γn), and is welded or Attachment
Ru. (8) is a sealing element, such as a glass sealing member, having a coefficient of thermal expansion substantially equal to that of the optical fiber (1), and is provided between the optical fiber (1) and the small diameter portion of the flexible member (6). is hermetically sealed. (9) is an end plate having a through hole for the tube (γ) and supporting the tube (γ) by welding, and is attached to the container wall penetrating portion. (7
) is a spacer inserted between the optical fiber striatum (1) and the tube body (γ) to prevent mechanical external force from being applied to the optical fiber striatum (1); For example, it is made of IPRP.

Furthermore, FIG. 5 shows an embodiment in which the sealed support device having the above structure is applied to a light water reactor plant.
and the concrete wall (because it penetrates the wall, the supporting part of this optical fiber strip is connected to the reactor containment vessel inner space I).
It is necessary to have a sealed and closed configuration that strictly cuts J from the outer space a→. Therefore, as shown in the figure, the container wall (9) and the conch Ij-)! (A sleeve (B) is attached to the penetration part 1210, and this sleeve is deaf) The sealed support device tt shown in FIG. It forms an airtight space (to) that blocks →.

As shown in each of the above configurations, according to the present invention, the sealing element (8) sealing the optical fiber strip (1) has approximately the same coefficient of thermal expansion as the optical fiber strip (1). Since the material is made of a glass-sealed cable, for example, even if a temperature difference occurs between the inside space (the inside space of the reactor containment vessel) and the outside space (the inside space of the reactor containment vessel), the It can prevent thermal stress on the sealing part and improve sealing performance. Moreover, the difference in thermal expansion between the end plate (9) and the tube body (7) due to the use of metal with the sealing portion is also reduced by this sealing element (
8) and a flexible member (6) interposed between the pipe body (γ)
It has the effect of being absorbed. Furthermore, if the flexible member (6) is also made of a metal (e.g. Kovar) having a coefficient of thermal expansion close to that of the optical fiber layer (1), the optical fiber layer (1) ), the sealing element (8), and the flexible member (6), there is no difference in thermal expansion, and the sealing performance can be further improved.

Furthermore, if dry N2 gas is sealed in the space α inside the container and the pressure of this N2 gas is monitored with a pressure needle,
Even if the seal parts are damaged for some reason, you can check whether each seal part has been damaged or not.
The gas can also prevent moisture adsorption on the sealing element (8).

Next, an embodiment of the above-described device of the present invention in which reliability such as airtightness is further improved will be described.

In Fig. 84, (to) is a nozzle stand, which is inserted and welded between the tube body (7) and the flexible member (6), and is used to jointly connect other sealing bearing parts facing each other. It is now possible to do so. In this way, each optical 7-eyeper assembly, which is constructed by joining the tube body (7), can be attached to the end plate (9).
I! Since the penetrating portion sealing mechanism can be constructed by connecting or locking, its mechanical strength is increased and earthquake resistance can be improved. Moreover, since this tube is equipped with holes, even during the manufacturing stage, the holes (6) made in the tube (G) of the single optical fiber assembly are
It is possible to inspect the sealing performance of a single optical fiber assembly by enclosing it in a gaseous state.
This enables quality control of individual fiber assemblies of each party.

Furthermore, even if the seal section is damaged, the optical fiber assembly itself can be removed from the connection between the tube body (γ) and the end plate (9), making repair and inspection work easier. .

As described above, according to the present invention, it is possible to obtain a support structure for an optical fiber linear body that has excellent heat resistance and is free from thermal distortion due to fluctuations in temperature. Furthermore, it is possible to obtain a sealed support device for an optical fiber strand that does not cause deterioration in sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a structural sectional view of a conventional device, FIG. 2 is a basic structural sectional view based on one embodiment of the present invention, and FIGS. 5 and 4 are structural sectional views showing other embodiments of the present invention. (1): Optical fiber strands (4), (6), (8): Seal element (6): Flexible member (9): End plate-two spacers
Ql: Reactor containment vessel wall (b) Nisleeve
−: Airtight space v): Pressure gauge N): Nozzle base Note that the same numbers in the figures indicate the same or equivalent parts. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] (1) An end plate attached to a penetrating portion of the container wall, a tube fixed through the end plate and having an optical fiber (striated body) passed through the inside, and A flexible member surrounding the lifted light distribution fiber strand fixed to the flexible member; A sealed support device for an optical fiber strip, characterized in that it is equipped with a strip and a sealing element having an almost unreasonable coefficient of thermal expansion. An optical fiber according to claim 1, characterized in that the optical fiber is made of a material having an expansion coefficient, and a sealing element made of glass is used as the sealing element.
Sealed bearing device for strips. (8) A patent characterized in that a sealing unit consisting of an end plate, a tube body, a flexible member, and a sealing element is arranged facing a container wall penetration part, and an airtight space is formed between these sealing units. A sealed support device for an optical fiber strand according to claim 1 or 2. (4) The optical fiber according to claim 6, characterized in that N2 gas is sealed in the airtight space formed between the sealed units, and the gas pressure is monitored to detect a leakage abnormality. The hermetic bearing apparatus of the striatum. (6) Attach a nozzle having an internal detection hole firmly fixed between the tube and the flexible member, and attach the tube to the other end of the nozzle,
3. A sealed support device for an optical fiber wire according to claim 1 or 2, characterized in that a sealed support portion is formed of a flexible member and a seal element.