JP5968948B2 - Long object insertion structure and long object insertion method - Google Patents

Description

  The present invention relates to a long object insertion structure and a long object insertion method for inserting a long object such as a cable, a pipe, and a string-like member into a boundary wall that divides two regions having different environments.

  Generally, in facilities where harmful substances and dust are generated internally, the two areas are different by dividing the internal area and the external area so that the harmful substances and dust do not flow out of the facility. Maintaining the environment.

  This type of facility is a boundary wall that divides into two regions having different environments, and is provided with a boundary wall provided with an opening for inserting a long object, and the opening can be opened and closed on both sides of the wall. A pair of doors (see, for example, Patent Document 1).

  Then, in the facility, when inserting a long object such as a cable, piping, string-like member or the like from the external region to the internal region, one door is opened and the external region is opened while the other door is closed. Carry long items inside.

  Thereafter, with one door open, the other door is opened, and the long object carried into the opening is carried into the internal region. That is, with both doors open, a long object is inserted from the outer region through the opening in the boundary wall into the inner region.

Japanese Patent Publication No. 63-16720

  Therefore, the long object insertion structure having the above configuration has a problem that the state where the two regions are partitioned cannot be maintained. That is, when a long object is inserted from the outer region into the inner region through the opening of the boundary wall, both doors must be opened, and there is a problem that the different environments of the two regions cannot be maintained.

  Therefore, in view of the above problems, the present invention provides a long object insertion structure and a long object insertion method capable of inserting a long object from one area to the other area while maintaining different environments in the two areas. The purpose is to provide.

The long object insertion structure according to the present invention is a boundary wall that is divided into two regions of negative pressure and positive pressure, and is provided with a long object insertion portion that penetrates the boundary wall in order to insert the long object. And a first tank provided in the negative pressure area of the two areas, the upper part being opened and the inside communicating with the elongated object insertion part, A second tank provided in a positive pressure area of the two areas, the upper tank being opened and a second tank having an interior communicating with the elongated object insertion portion; a first tank; A liquid filled in the second tank, a liquid for liquid-sealing the long object insertion portion, and a liquid level detection tube disposed in each of the first tank and the second tank, comprising a liquid level detecting pipe liquid level is displayed in accordance with the difference between the first tank and each pressure of the second tank, and a connecting pipe connecting the two liquid level detecting pipe And wherein the door.
According to this configuration, the liquid is injected into each of the inside of the first tank, the long object insertion portion communicating with the inside, and the inside of the second tank communicating with the long object insertion portion, The liquid enters each of the first tank, the long object insertion portion, and the second tank, and as a result, each of the first tank, the long object insertion portion, and the second tank is liquid-sealed. Therefore, even if the environment of one of the regions is worse than that of the other region, the contaminants in the other region do not flow into the one region through the long object insertion portion. For this reason, in the long object insertion structure according to the present invention, while maintaining the environment of two different areas, a long object such as a cable or a pipe is passed from one area to the other area through the long object insertion portion. Can be inserted.

In this case, the liquid level detection tube arranged in the first tank has a reference liquid level of the first tank and an upper limit liquid level displayed above the reference liquid level, and the second tank The liquid level detection tube disposed in the tank preferably has a reference liquid level of the second tank and an upper limit liquid level displayed below the reference liquid level.

  The first tank and the second tank are preferably provided with lids that can be opened and closed at the tops thereof.

  According to this configuration, the upper part of the first tank and the upper part of the second tank are closed by the lid, so that no foreign matter enters the liquid in the first tank and the second tank. Further, the liquids in the first tank and the second tank do not evaporate.

  In this case, it is preferable that the liquid level of the liquid filled in the first tank and the second tank is positioned above the long object insertion portion.

  According to this configuration, the first tank, the long object insertion portion, and the second tank are surely liquid-sealed.

  As described above, according to the present invention, it is possible to achieve an excellent effect that a long object can be inserted from one region to the other region while maintaining different environments in the two regions.

FIG. 1 is a cross-sectional view showing a long object insertion structure according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining a condition in which radiation is shielded by a boundary wall when one region is a radioactive substance management region in the long object structure according to the embodiment. Fig.3 (a)-(c) is explanatory drawing which shows the elongate object insertion method which concerns on the embodiment. FIG. 4 shows a state where there is a difference between the pressure on the liquid level in one region and the pressure on the other liquid level when one region is a radioactive substance management region in the long object structure according to the embodiment. Figure. FIG. 5 is a cross-sectional view showing a long object insertion structure according to the second embodiment of the present invention. FIG. 6A to FIG. 6C are explanatory views showing a long object insertion method according to the embodiment.

  A long object insertion structure and a long object insertion method according to an embodiment of the present invention will be described with reference to the drawings. The present invention is an example of a nuclear facility that is defined by a boundary wall that divides a radioactive material management area (a divided area mainly containing radioactive material in the air) and an unmanaged area, such as a nuclear facility. explain. Moreover, as a long thing inserted in a long thing insertion part, it is set as the cable for supplying emergency power to the apparatus installed in the nuclear reactor facility at the time of emergency, for example.

(First embodiment)
As shown in FIG. 1, the long object insertion structure 1 according to the first embodiment includes two regions having different environments, that is, one region A (radioactive substance management region) and the other region B (non-management region). A boundary wall 2 partitioned into two areas, a first tank 3 provided in one area A of the two areas A and B, and a second tank B provided in the other area B 1 of the two areas A and B. A second tank 4 and a liquid 5 filled in the first tank 3 and the second tank 4 are provided.

  In the boundary wall 2, an opening 2 a as a long object insertion portion 20 for inserting the long object C is provided through the boundary wall 2.

  The first tank 3 and the second tank 4 are formed in the same shape on both sides of the boundary wall 2. That is, the bottom wall 10 inserted through the opening 2a of the boundary wall 2 and arranged symmetrically with respect to the boundary wall 2 (arranged with the same length in each of the two regions A and B) and one region It is the 1st side wall 31 standingly arranged by the peripheral part of the bottom wall 10 arrange | positioned in A, Comprising: It arrange | positioned in the 1st side wall 31 which covers the opening 2a by the side of one area | region A, and the other area | region B The second side wall 41 is erected on the peripheral edge of the bottom wall 10, and is formed with the second side wall 41 covering the opening 2 a on the other region B side. As a material of the 1st tank 3 and the 2nd tank 4, what has intensity | strength, such as concrete, iron, lead, is mention | raise | lifted, for example.

  Specifically, the first tank 3 is formed by the bottom wall 10, the side wall 31, and the boundary wall 2 disposed in one region A, and the bottom wall 10 and the side wall 41 disposed in the other region B A second tank 4 is formed with the boundary wall 2. The boundary wall 2 and the side wall 31 define an upper opening 3 a of the first tank 3, and the boundary wall 2 and the side wall 41 define an upper opening 4 a of the second tank 4. Further, the interior 3 b of the first tank 3 and the interior 4 b of the second tank 4 communicate with the long object insertion portion 20.

  A long object insertion portion 20 is defined by the upper inner surface of the opening 2a of the boundary wall 2 and the upper surface of the central portion of the bottom wall 10 inserted through the opening 2a. And the upper end part of the 1st side wall 31 and the upper end part of the 2nd side wall 41 are in a position higher than the upper side inner surface of the opening 2a of the boundary wall 2. FIG. Thereby, the 1st tank 3, the elongate object insertion part 20, and the 2nd tank 4 will be liquid-sealed reliably.

  The liquid 5 is for sealing the long object insertion portion 20 and has fluidity such as water and gel.

  Here, the shielding property of the long object insertion structure 1 with respect to a radioactive substance existing in the radioactive substance management area A (hereinafter simply referred to as a radioactive substance) will be described with reference to FIG. The shielding property of the boundary wall 2 is determined by shielding the radiation γ1 that passes in the direction orthogonal to the boundary wall 2. The condition for shielding the radiation γ1 passing through the boundary wall 2 in the orthogonal direction is determined by the mass (density × thickness) of the boundary wall 2.

  When ρ1 is the density of the boundary wall 2 and t1 is the thickness of the boundary wall 2, the condition for shielding the radiation γ passing in the direction orthogonal to the boundary wall 2 is ρ1 × t1 or more.

  On the other hand, the shielding property of the second tank 4 is determined by shielding the radiation γ2 that enters the non-management region B from the radioactive substance management region A through the long object insertion portion 20 at the maximum angle. Radiation γ2 that enters the non-management area B at the maximum angle θ from the radioactive substance management area A through the long object insertion portion 20 (the upper corner of the opening 2a of the boundary wall 2 on the radioactive substance management area A side, and The condition for shielding the radiation γ2) that passes through the lower corner of the opening 2a of the boundary wall 2 on the unmanaged region B side is determined by the mass (density × thickness / sinθ) of the second tank 4.

  When ρ2 is the density of the second tank 4 in the non-management area B and t2 is the thickness of the second tank 4, the second substance in the non-management area B from the radioactive substance management area A through the long object insertion portion 20 is used. The condition for shielding the radiation γ incident on the tank 4 at the maximum angle θ is ρ2 × t2 / sinθ or more.

  Therefore, in the normal state, the following relational expression is established to ensure the shielding property of the long object insertion structure 1.

ρ1 × t1 ≦ ρ2 × t2 / sinθ

  By satisfying this equation, the radiation γ is shielded by the second tank 4 and does not enter the non-management area B from the radioactive substance management area A through the long object insertion portion 20, and thus two different areas. A and B environments are maintained.

  When the opening 3a of the first tank 3 and the opening 4a of the second tank 4 are expected to be shielded by a lid 6 described later, the mass of the liquid 5 filled in the long object insertion portion 20 is The condition is that the mass is 6 or more.

  Next, a long object insertion method according to the first embodiment will be described with reference to FIGS. First, as shown in FIG. 3A, the first tank 3, the long object insertion portion 20, and the second tank 4 are not filled with the liquid 5. The upper part of the second tank 4 is open. In this state, a liquid injection process is performed. That is, as shown in FIG. 3B, the liquid 5 is injected from the opening 4 a of the second tank 4. Next, the process proceeds to the liquid sealing step. That is, the liquid injected from the opening 4 a of the second tank 4 enters the long object insertion portion 20 and the first tank 3. As a result, each of the 2nd tank 4, the elongate object insertion part 20, and the 1st tank 3 is liquid-sealed. Thereby, different environments of the two areas A and B are maintained.

  Then, it transfers to a long thing insertion process. That is, as shown in FIG. 3C, the long object C is inserted from the second tank 4 through the long object insertion part 20 into the first tank 3. Specifically, the long object C is inserted from the upper opening 4 a of the second tank 4 toward the long object insertion part 20, and the opening of the upper part of the first tank 3 from the long object insertion part 20. It is inserted toward 3a. At this time, the long object C is greatly curved downward.

  Further, the liquid level of the liquid 5 filled in the first tank 3 and the second tank 4 is positioned above the long object insertion portion 20. By doing so, the 1st tank 3, the elongate object insertion part 20, and the 2nd tank 4 are reliably liquid-sealed with the liquid 5 with which it fills, and two different environments are maintained.

  In this embodiment, since one area A is a radioactive substance management area, the environment of the radioactive substance management area A is actually such that the radioactive substance does not flow out of the radioactive substance management area A. A negative pressure is applied to the non-management area B. Therefore, as shown in FIG. 4, the liquid level of the tank 3 in the radioactive substance management area A is located above the liquid level of the tank 4 in the non-management area B. When the long object C is inserted into the long object insertion part 20 in an emergency, the negative pressure side area A is inserted from the positive pressure side area B.

  In the case of FIG. 4, when the liquid 5 is injected from the non-management area B into the long object insertion portion 20, whether or not the liquid 5 has entered the first tank 3 of the radioactive substance management area A, Since there is the boundary wall 2, it cannot be confirmed from the non-management area B. Therefore, a means for confirming the liquid level of the first tank 3 in the radioactive substance management area A in the non-management area B is required. As this means, a liquid level detection device 7 including two liquid level detection tubes 70a and 70b attached to the first tank 3 and the second tank 4 is used.

  One liquid level detection pipe 70 a includes a bottomed cylindrical main body pipe 71 a that detects the liquid level in the first tank 3. The main body pipe 71a has a reference liquid level S and an upper limit liquid level max displayed above the reference liquid level S. The other liquid level detection tube 70 b includes a bottomed cylindrical main body tube 71 b that detects the liquid level in the second tank 4. The main body pipe 71b has a reference liquid level S and an upper limit liquid level max displayed below the reference liquid level S.

  Then, the first liquid flow pipes 710 a and 710 b of the two liquid level detection pipes 70 a and 70 b are connected by the connection pipe 712. By connecting each of the first liquid passing pipes 710a and 710b of the two liquid level detecting pipes 70a and 70b, the liquid level detecting pipe in the other area in accordance with the change in the liquid level in the tank in either one area. The liquid level at 70 changes. For this reason, by visually recognizing the liquid level in the liquid level detection tube 70 in the other region, the liquid level in the tank in either region can be known.

  When the liquid 5 is injected into the first tank 3 from the second tank 4 in the non-management area B through the long object insertion portion 20 and sealed, the first liquid pipe 710b of the second tank 4 is connected. The liquid 5 entered the pipe 712 and the first liquid passing pipe 710a of the first tank 3, and was displayed on each of the liquid level detection pipe 70b in the non-management area B and the liquid level detection pipe 70a in the radioactive substance management area A. The liquid level reaches the reference liquid level S. By visually recognizing this state in the non-management area B, it is possible to know that the first tank 3 in the radioactive substance management area A is also at the reference liquid level S.

  In the present embodiment, since the radioactive substance management area A is set to a negative pressure with respect to the non-management area B, actually, as shown in FIG. Due to the pressure difference, a difference occurs between the liquid level in the first tank 3 and the liquid level in the second tank 4. That is, the liquid level in the first tank 3 rises higher than the liquid level in the second tank 4.

  Hereinafter, the reference liquid level S and the upper limit liquid level max of the first tank 3 and the second tank 4 will be specifically described. First, the reference liquid level S of the 1st tank 3 and the 2nd tank 4 is calculated | required by following Formula.

  (The upper limit liquid level max of the first tank 3−the upper limit liquid level max of the second tank 4) / 2 = reference liquid level S

  As described above, the upper limit liquid level max of the first tank 3 is set higher than the reference liquid level S, and the upper limit liquid level max of the second tank 4 is set lower than the reference liquid level S.

When the liquid 5 is injected from the second tank 4 in the non-management area B into the first tank 3 through the long object insertion portion 20 and sealed, the atmospheric pressure of the radioactive substance management area A with respect to the non-control area B Due to the difference, the liquid level in the first tank 3 rises from the reference liquid level S to the upper limit liquid level max, and the liquid level detection pipe 70b in the second tank 4 is connected to the liquid level detection pipe 70a in the first tank 3. The liquid 5 enters through the pipe 712 , and the liquid level rises to the upper limit liquid level max of the liquid level detection pipe 70a of the first tank 3. On the other hand, as the liquid level in the liquid level detection tube 70a of the first tank 3 rises, the liquid level in the liquid level detection pipe 70b of the second tank 4 falls from the reference liquid level S to the upper limit liquid level max. Thereby, it can visually recognize in the non-management area | region B that the liquid level of the 1st tank 3 is the upper limit liquid level max.

  Thus, according to the long object insertion structure 1 which concerns on 1st embodiment, two area | regions A from which an environment differs by the boundary wall 2 in which the long object insertion part 20 for inserting a long object was provided. The first tank 3 is provided in one of the two areas A and B, and the second tank 4 is provided in the other area B. 3. Since the liquid 5 is injected into the long object insertion part 20 and the second tank 4, and the first tank 3, the long object insertion part 20 and the second tank 4 are liquid-sealed, there are two areas. The long object C can be inserted from one region A to the other region B while maintaining different environments of A and B.

(Second embodiment)
Next, a long object insertion structure and a long object insertion method according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6A to 6C. In these figures, the same reference numerals as those in FIG. 1 and FIGS. 3A to 3C denote the same or corresponding parts, and only different points will be described below.

  As shown in FIG. 5, the elongated object insertion structure according to the second embodiment has an openable / closable lid disposed in each of the upper opening 3 a of the first tank 3 and the upper opening 4 a of the second tank 4. 6 and 6 are provided.

  Next, a long object insertion method according to the second embodiment will be described with reference to FIGS. First, as shown in FIG. 6 (a), openable and closable lids 6 and 6 are arranged in the opening 3 a of the first tank 3 and the opening 4 a of the second tank 4, respectively. 3a and the opening 4a of the second tank 4 are closed. In addition, the liquid 5 shall not be inject | poured into the 1st tank 3, the elongate object insertion part 20, and the 2nd tank 4. FIG.

  The liquid injection process is performed from this state. That is, as shown in FIG. 6B, the lid 6 in the other region B is opened, and the liquid 5 is injected from the tank 4 in the other region B. Then, it transfers to a liquid sealing process, the liquid 5 enters into each of the 2nd tank 4, the elongate object insertion part 20, and the 1st tank 3, As a result, the 2nd tank 4, the elongate object insertion part 20. Each of the first tanks 3 is liquid-sealed. Next, the process proceeds to the long object insertion process. That is, as shown in FIG. 6 (c), the lid 6 in one area A is opened, and the long object C passes from the second tank 4 through the long object insertion part 20 to the first tank 3. It is inserted.

  As described above, according to the long object insertion structure 1 </ b> A according to the second embodiment, the pair of lids 6 that can be opened and closed disposed in the opening 3 a of the first tank 3 and the opening 4 a of the second tank 4, respectively. , 6, one lid 6 is opened, liquid 5 is injected from one tank 4, and the second tank 4, the long object insertion portion 20, and the first tank 3 are liquid-sealed. . Therefore, the long object C can be inserted from the region B to the region A while maintaining different environments of the two regions A and B.

  It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

  For example, in the second embodiment, the first tank 3, the long object insertion portion 20, and the second tank 4 have been described as an example in which the liquid 5 is not filled. It may be filled. In this case, the lid 6, 6 closes the opening 3 a of the first tank 3 and the opening 4 a of the second tank 4, so that no foreign matter enters the liquid 5. Moreover, since the airtightness with respect to the 1st tank 3, the elongate object insertion part 20, and the 2nd tank 4 is ensured by the lid | covers 6 and 6, the liquid 5 does not evaporate. Moreover, when the liquid 5 is filled in advance, the lids 6 and 6 may open either one or both.

  In the case of the second embodiment, the opening 3a of the first tank 3 and the opening 4a of the second tank 4 are closed by the lids 6 and 6 so as to prevent the outflow of radioactive substances. The opening 3a of the first tank 3 and the opening 4a of the second tank 4 are covered with a blue sheet (not shown), and the opening 3a of the first tank 3 and the opening 4a of the second tank 4 are formed. Even if it is blocked, the outflow of radioactive material can be prevented.

  Moreover, in the case of each said embodiment, the cable for supplying emergency power to the apparatus in a nuclear reactor facility is inserted as an elongate thing C inserted in the elongate article insertion part 20 of the boundary wall 2 at the time of emergency. However, it may be a string-like member such as a pipe, a hose, or a wire.

  Moreover, in the case of each said embodiment, although the elongate object insertion part 20 was provided through the boundary wall 2, the pipe body penetrated by the boundary wall 2 may be sufficient.

  In each of the above embodiments, the boundary wall 2 provided in the reactor facility has been described as an example. However, the boundary wall may be a partition wall that divides a region where dust is generated.

  DESCRIPTION OF SYMBOLS 1,1A ... Long object insertion structure, 2 ... Boundary wall, 20 ... Long object insertion part, 3 ... 1st tank, 3a ... Opening (upper part of opened 1st tank), 3b ... 1st Inside of tank, 4 ... second tank, 4a ... opening (upper part of opened second tank), 4b ... inside of second tank, 5 ... liquid, 6 ... lid, A ... one area (radioactive Substance management area), B ... The other area (non-management area), C ... Long object, γ ... Radiation

Claims (4)

A boundary wall partitioned into two areas of negative pressure and positive pressure, and a boundary wall provided with a long object insertion portion penetrating the boundary wall in order to insert a long object;
A first tank provided in the negative pressure area of the two areas, the first tank is open at the top, and the inside communicates with the elongated object insertion part;
A second tank provided in a positive pressure region of the two regions, the upper part being opened, and a second tank in which the interior communicated with the elongated object insertion part;
A liquid filled in the first tank and the second tank, and a liquid for liquid-sealing the long object insertion portion;
Liquid level detection pipes arranged in each of the first tank and the second tank, wherein the liquid level is displayed according to the difference in atmospheric pressure in each of the first tank and the second tank. Tube,
A long object insertion structure comprising a connecting pipe that connects two liquid level detecting pipes . The liquid level detection tube disposed in the first tank has a reference liquid level of the first tank and an upper limit liquid level displayed above the reference liquid level, and is disposed in the second tank. 2. The long object insertion structure according to claim 1, wherein the liquid level detection tube has a reference liquid level of the second tank and an upper limit liquid level displayed below the reference liquid level. . The long tank insertion structure according to claim 1 or 2 , wherein a lid that can be opened and closed is arranged at an upper portion of each of the first tank and the second tank. The liquid level of the liquid with which a 1st tank and a 2nd tank are filled is located above a long thing insertion part, The long length of any one of Claim 1 thru | or 3 characterized by the above-mentioned. Object insertion structure.

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