JP2016212026A - Water intake port protection arrangement of nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water intake port protection arrangement of nuclear power plant capable of satisfying requirements of improving the security while ensuring the intake water flow rate.SOLUTION: A water intake port protection arrangement 20 of nuclear power plant is an arrangement for protecting a water intake port 13 of a nuclear power plant. The water intake port protection arrangement 20 includes a floating gate 22 for limiting intake area 13S for taking water of the water intake port 13 below the water surface 1. The water intake port protection arrangement 20 controls the close position of the floating gate 22 to prevent the area of the water intake area 13S from becoming less than a predetermined lower limit area (=H2×W1).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water intake protection device for a nuclear power plant.

  At nuclear power plants, external water such as seawater is taken in and used. If drifting objects or aquatic organisms adhere to or block the intake, the function of the intake will deteriorate. Therefore, a protection device for maintaining the function of the intake port is required (Patent Documents 1 to 3). Furthermore, in recent years, prevention of intruders from the outside is also required from the viewpoint of maintaining security.

JP 2014-037740 A JP 2005-213858 A JP 2004-3000696 A

  In the conventional technology, a screen is installed around the intake port to prevent the entry of underwater creatures, drifting objects, and garbage into the intake port, but it prevents intruders from outside. It lacks the point of view. Therefore, there is room for improvement in terms of security improvement. On the other hand, it is necessary for a nuclear power plant to take in a predetermined amount or more of water through a water intake, and it is necessary to ensure both the intake flow rate and the security maintenance. However, the prior art does not include the viewpoint of achieving both of ensuring the intake flow rate and maintaining security.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a water inlet protection device for a nuclear power plant that can improve security. Another object of the present invention is to provide a water intake protection device for a nuclear power plant that can achieve both improvement in security and securing of a water intake flow rate.

  In order to solve the above-described problems, a water intake protection device for a nuclear power plant according to the present invention is a water intake protection device for protecting a water intake of a nuclear power plant, and the water intake area where the water intake takes in water is below the surface. And the closed position of the floating gate is regulated to prevent the area of the water intake region from being less than a predetermined lower limit area.

  According to the present invention, the water intake area can be restricted below the surface of the water by the floating gate, so that at least a part of the third person's intrusion path can be submerged, making intrusion difficult. Furthermore, since the closed position of the floating gate is regulated so as to prevent the area of the water intake region from becoming less than the lower limit area, both the securing of the water intake flow rate and security maintenance can be achieved.

The perspective view which shows water intake equipment. Sectional drawing seen from the direction of arrow II in FIG. The perspective view which shows the water intake equipment which concerns on 2nd Example. The schematic diagram which looked at the water intake equipment which concerns on 3rd Example from the front. The perspective view of the water intake protection apparatus which concerns on 4th Example. Sectional drawing of the water intake equipment which concerns on 5th Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as described in detail below, the water intake protection device 20 is provided in the water intake facility 10 in front of the water intake 13 in front of the bar screen 14. And the intake protection device 20 floats within the range where the floating gate 22 which always secures draft and the lower end of the floating gate 22 can secure the intake flow rate so that the intake 13 is restricted below the sea surface 1. The position restricting members 23 and 24 for restricting the operation to be performed and the guide portion 21 for guiding the vertical movement due to the tide level fluctuation of the floating gate 22 are configured.

  A first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows a perspective view of a water intake facility 10 provided in a nuclear power plant. FIG. 2 shows a cross-sectional view in the direction of arrow II in FIG.

  The water intake facility 10 is an accessory facility of a nuclear power plant, and is installed on the seabed 3, for example, facing a water area such as the ocean or a lake. Hereinafter, a case where the water intake facility 10 takes in seawater will be described as an example. The water intake facility 10 includes, for example, a structure 11, a flow path 12 provided in the structure 11, a bar screen 14 provided in the middle of the flow path 12, and a water intake protection device provided in front of the water intake 13. 20.

  The structural body 11 is formed in, for example, reinforced concrete in a substantially rectangular tube shape in cross section, and a flow path 12 is provided in the inside thereof in the longitudinal direction. One opening of the channel 12 is a water intake 13 that opens facing the ocean. The other opening of the channel 12 is an outlet (not shown) connected to a condenser or the like not shown.

  The bar screen 14 is provided in the middle of the flow path 12 at the back of the water intake 13 and is composed of a plurality of bars that are spaced apart at a predetermined interval. When the seawater that has flowed into the flow path 12 from the intake port 13 flows through the gap between the bars, marine organisms such as jellyfish and seaweed, and drifting substances such as dust are captured and removed.

  The intake port protection device 20 is located on the front side of the intake port 13 and is provided in the structure 11, and protects the intake port 13 from marine organisms, drifting objects, third parties, and the like. The water intake protection device 20 includes, for example, a guide part 21, a floating gate 22, and stopper parts 23 and 24.

  The pair of guide portions 21 are provided opposite to the left and right sides of the water intake 13. Each guide portion 21 has a groove portion (not shown) for slidably holding the vicinity of both ends in the left-right direction of the floating gate 22. Each guide portion 21 supports a floating gate 22 that moves up and down according to the elevation of the sea surface 1 from both the left and right sides. If possible in terms of mechanical structure, a configuration in which the floating gate 22 is supported by only one of the left and right sides may be adopted instead of the so-called both-end supported floating gate 22 as shown in the figure. .

  Here, the guide part 21 restricts the movement of the floating gate 22 only to the vertical movement accompanying the fluctuation of the tide level. The vertical position of the floating gate 22 fluctuates with the fluctuation of the tide level, but the draft H4 does not fluctuate even if the tide level changes. A predetermined mounting clearance is required between the guide portion 21 and the floating gate 22, but the guide portion 21 is configured so that the floating gate 22 can be prevented from being displaced in the front-rear direction. preferable. Furthermore, for example, a self-lubricating resin may be provided on the inner surface of the groove so that the guide 21 can smoothly guide the vertical movement of the floating gate 22.

  The floating gate 22 is configured so that the draft H4 within a predetermined range can be secured at all times, and is displaced in the vertical direction according to the top and bottom of the sea surface 1. The floating gate 22 can be formed from various materials such as a metal material, a synthetic resin material, and a ceramic material. However, the floating gate 22 can maintain a constant draft for many years and tries to enter the intake port 13. What is necessary is just to comprise using the material which can endure the attack from the third party.

  The “draft H4 within a predetermined range” is an expression that takes into account that the draft H4 can vary according to changes in tide level, climate, surrounding environment, and the like. The value of “predetermined range” can be appropriately determined according to the installation environment of the water intake facility 10. As one example, if the draft H4 is set to a value that makes it difficult to see the lower end of the floating gate 22 when looking down from the sea surface 1 to the floating gate 22 below the sea surface, the security is improved. If a third party on the surface of the sea makes it difficult to understand the depth of the draft H4, the willingness to invade can be discouraged.

  The stopper portions 23 and 24, which are examples of “position restricting members”, are provided on the lower side of the front surface of the water intake port 13 and are spaced apart from each other on the structure 11. The stopper parts 23 and 24 are comprised from the contact part 23 and the leg part 24 which supports the contact part 23. FIG. The contact portion 23 contacts the lower end of the floating gate 22 at a position away from the lower end of the water intake 13 by a distance H2. On the upper surface of the contact portion 23, an impact absorbing portion made of a rubber material or a synthetic resin material may be provided in order to reduce a shock or sound when contacting the lower end of the floating gate 22. The upper end of the leg portion 24 is attached to the lower surface of the contact portion 24, and the lower end of the leg portion 24 is bent in an L shape and attached to the structure 11. As described above, the leg portion 24 supports the upper surface of the contact portion 23 so as to be located at a location away from the lower end of the water intake port 13 by a distance H2. Since the pair of left and right leg portions 24 are provided apart from each other, a gap is formed between each leg portion 24. Further, a gap is also formed between each leg 24 and both the left and right sides of the water intake 13. Due to the presence of these gaps, seawater can flow into the water intake 13 even when the floating gate 22 is closed.

  When the floating gate 22 descends as the tide elevates, the lower end of the floating gate 22 comes into contact with the contact portion 23 and stops. When the settling of the floating gate 22 is restricted by the stopper portions 23 and 24, the height dimension of the water intake region 13 </ b> S in the water intake 13 is a distance H <b> 2 from the lower end of the water intake 13 to the upper surface of the contact portion 23. In other cases, that is, when the floating gate 22 is located above the upper surface of the contact portion 23, the height of the water intake region 13S is such that the upper surface of the contact portion 23 and the lower end of the floating gate 22 are at the distance H2. A value obtained by adding a separation distance H5 between the two.

  The intake area 13 </ b> S indicates a range in which seawater can be actually taken out of the entire intake port 13. Of the total opening area of the intake port 13, the portion blocked by the floating gate 22 cannot take in seawater. The water intake region 13 </ b> S has a value obtained by subtracting the area where the floating gate 22 blocks the water intake 13 from the total opening area of the water intake 13.

  Here, if the height dimension of the intake port 13 is H1 and the width dimension is W1, the area S1 of the intake port 13 is H1 × W1. The area S2 of the water intake region 13S is either (H2 + H5) × W1 or H2 × W1. In addition, the distance to the upper surface of the contact part 23 and the upper end of the water intake 13 is shown as H3. As described above, the sinkable position of the floating gate 22 is defined by the stoppers 23 and 24, so the area of the water intake region 13S does not decrease below the lower limit area (H2 × W1).

  On the other hand, the upper side of the floating gate 22 covers the upper side of the water intake port 13 in a state where the floating gate 22 has settled and closed to a position regulated by the stopper portions 23 and 24. That is, even when the position of the floating gate 22 fluctuates due to a tide level or the like, a substantial gap does not occur between the upper end of the floating gate 22 and the upper end of the water intake port 13. The fact that a substantial gap does not occur means that there is no gap that can prevent the intrusion of a third party or the invasion of a foreign object such as driftwood.

  Reference is made to the cross-sectional view of FIG. In the state shown in FIG. 2, the floating gate 22 has settled to a position regulated by the stopper portions 23 and 24 and stopped. If the third party 2 on a boat or the like approaches the intake port 13, the third party 2 cannot pass through the intake port 13 unless diving to the lower side of the contact portion 23. Furthermore, it is difficult for a third party to know what structure and situation is beyond the gap between the leg portions 24. This is because the tip of the water intake 13 is under the sea and cannot be seen from the sea. Therefore, a third party who tries to enter the water intake facility 10 must dive toward a place where the situation is unknown, and it is difficult to enter physically and psychologically.

  According to this embodiment configured as described above, the following effects can be obtained. In the present embodiment, a floating gate 22 that always secures a draft H4 within a predetermined range is provided at the water inlet 13, and a region on the sea surface of the water intake 13 is covered with the floating gate 22, and the water intake region 13S is below the sea surface. Set to. A third party who tries to enter the water intake facility 10 from the sea side can only pass through the water intake area 13S. This is because the area other than the water intake area 13 </ b> S in the total opening area of the water intake 13 is blocked by the floating gate 22. Accordingly, at least a part of the third-party intrusion route is in the sea and the diving is forced to inhibit third-party intrusion. Thereby, the security of the water intake equipment 10 can be improved regardless of the tide level.

  Furthermore, in this embodiment, the lower limit area of the water intake region 13S is secured by restricting the closed position (sedimentation position) of the floating gate 22 with the stopper portions 23 and 24. Therefore, security can be improved while securing seawater required by the nuclear power plant.

  Furthermore, in this embodiment, since the intake port protection device 20 is provided on the front side of the intake port 13, it can be attached to the existing intake facility 10 by so-called retrofitting. Therefore, the security of the water intake facility 10 can be relatively easily enhanced regardless of whether the facility is newly installed.

  Furthermore, in this embodiment, the guide portion 21 guides the vertical movement of the floating gate 22 in accordance with the tide level fluctuation, so that the floating gate 22 always slides with respect to the guide portion 21. Accordingly, foreign matters such as marine organisms and dust adhering to the groove portion of the guide portion 21 and the surface of the floating gate 22 can be automatically removed and cleaned using the sliding caused by the tide level fluctuation. Although it is not possible to clean the entire groove portion or the like, foreign matters within the range in which the floating gate 22 and the guide portion 21 are in sliding contact with each other can be automatically removed, so that maintenance work can be reduced and maintenance costs can be reduced. Can be reduced.

  A second embodiment will be described with reference to FIG. Each of the following embodiments including this embodiment corresponds to a modification of the first embodiment, and therefore, differences from the first embodiment will be mainly described. In the intake port protecting device 20A of the present embodiment, the guide portion 21A, the stopper portions 23 and 24A, and the floating gate 22A are improved.

  A plurality of guide rollers 25 are disposed in the guide portion 21A. Each guide roller 25 comes into contact with both left and right end surfaces of the floating gate 22 and reduces sliding resistance. As a result, the floating gate 22 can move up and down smoothly according to changes in the tide level.

  Unlike the first embodiment, the leg portions 24A of the stopper portions 23 and 24A are formed straight, and receive the weight of the floating gate 22 in contact with the contact portion 23 from the vertical direction. Thereby, the lifetime of the leg part 24 can be extended and the reliability of the water inlet protection apparatus 20A can be improved.

  A camouflage color coating 26 is applied to the area below the waterline in front of the floating gate 22 so that it cannot be easily distinguished from the sea. Thereby, even when a third party observes the draft of the floating gate 22 from the sea, the depth of the draft is difficult to understand.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in the present embodiment, the above-described effects can be obtained.

  A third embodiment will be described with reference to FIG. In this embodiment, the stopper portions 23B and 24B are configured to be extendable and contractible. FIG. 4 is a schematic view of the water intake protection device 20B as viewed from the front. The pair of leg portions 24 </ b> B are provided so as to intersect with each other, and an intermediate portion thereof is rotatably supported by the rotation support portion 27.

  As shown in FIG. 4A, when the floating gate 22 is not in contact with the contact portion 23B, the distance between the contact portion 23B and the installation surface (for example, the seabed 3) of the leg portion 24B is H6 (a). And As shown in FIG. 4B, when the floating gate 22 contacts the contact portion 23B, the distance between the contact portion 23B and the installation surface of the leg portion 24B is set to H6 (b). The contact distance H6 (b) is smaller than the non-contact distance H6 (a) (H6 (b) <H6 (a)). That is, the stopper portions 23B and 24B expand and contract by a predetermined amount (= H6 (a) −H6 (b)) according to the contact of the floating gate 22. And by this expansion and contraction, a damper function is realized to alleviate the impact when the floating gate 22 is seated on the contact portion 23B. Although illustration is omitted, it is assumed that the stopper portions 23B, 24B and the rotation support portion 27 are provided with a spring or the like for realizing a damper function.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in this embodiment, since the stopper portions 23B and 24B having a damper function are provided, the impact when the floating gate 22 settles to the closed position and stops can be alleviated.

  A fourth embodiment will be described with reference to FIG. In the intake port protecting device 20C of the present embodiment, the guide portion 21C includes a guide hole 28 provided through the floating gate 22 in the vertical direction, and a guide rail portion 29 slidably inserted into each guide hole 28. And comprising.

  On both the left and right sides of the floating gate 22, guide holes 28 penetrating the floating gate 22 vertically are formed. A guide rail portion 29 is slidably inserted into each guide hole 28. Both end portions of the guide rail portion 29 are attached to the front side of the structure 11 of the water intake facility 10.

  The floating gate 22 sinks as the tide level decreases, but stops when it comes into contact with the bent portion at the lower end of the guide rail portion 29. That is, the lower side of the guide rail part 29 exhibits the function as the contact part 21C.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in this embodiment, since the guide portion 21C is provided inside the floating gate 22, the structure can be simplified. Furthermore, in this embodiment, since the function as a stopper can be provided on the lower side of the guide rail portion 29 constituting the guide portion 21C, the configuration of the water intake protection device 20C can be further simplified. Note that one or more guide portions 21C may be provided not only on the left and right sides of the floating gate 22, but also in the intermediate portion in the width direction. The guide rail portion 29 of the guide portion 21 disposed in the middle portion of the floating gate 22 may be provided with a ring-shaped contact portion 23C in the middle of the lower side thereof.

  A sixth embodiment will be described with reference to FIG. In the present embodiment, the intake port protection device 20 </ b> D is provided behind the water inlet 13.

  At the upper part of the structure 11, an attachment accommodating portion 15 is provided between the intake port 13 and the bar screen 14 for attaching the floating gate 22 </ b> D. In the mounting housing 15, the upper end of the floating gate 22 </ b> D is provided so as to be movable up and down. The floating gate 22D moves up and down according to the tide level while being guided by the guide portion 21D. Stoppers 23D and 24D for defining the closed position of the floating gate 22D are provided below the floating gate 22D.

  This embodiment, which is configured in this way, also has substantially the same operational effects as the first embodiment. However, since the intake port protection device 20D of the present embodiment is provided inside the structure 11, it is difficult to retrofit the existing intake facility 10 with the intake port protection device 20D. However, in this embodiment, the upper side of the floating gate 22D can be protected using the structure 11, and the defense power against attacks by third parties can be enhanced.

  In addition, this invention is not limited to embodiment mentioned above. A person skilled in the art can make various additions and changes within the scope of the present invention. For example, the above-described embodiments can be used in appropriate combination.

  1: sea surface, 2: third party, 3: sea floor, 10: water intake equipment, 11: structure, 12: flow path, 13: water intake, 14: bar screen, 20: water intake protective device, 21: guide section , 22: floating gate, 23: contact part, 24: leg part

Claims (8)

A water intake protection device for protecting a water intake of a nuclear power plant,
A floating gate that restricts the water intake area under which the water intake takes water;
In order to prevent the area of the water intake region from becoming less than a predetermined lower limit area, the closed position of the floating gate is regulated.
Inlet protection device for nuclear power plants. In order to prevent the area of the water intake region from becoming less than the predetermined lower limit area, a position restricting member for restricting the closed position of the floating gate is provided.
The intake port protection device for a nuclear power plant according to claim 1. The floating gate is provided so as to be movable up and down according to the water level so as to always ensure a draft within a predetermined range.
The intake port protection device for a nuclear power plant according to claim 2. A guide member for guiding the floating gate that moves up and down according to the water level;
The intake port protection device for a nuclear power plant according to claim 2. The upper end of the floating gate is always formed so as to be located at a position higher than the upper end of the intake port.
The intake port protection device for a nuclear power plant according to claim 4. The floating gate, the position regulating member, and the guide member are provided on the front side of the water intake,
The intake port protection device for a nuclear power plant according to claim 4. The position restricting member is configured to be able to expand and contract by a predetermined amount in the vertical direction, and the predetermined lower limit area is ensured when the position restricting member reaches a lower limit position.
The intake port protection device for a nuclear power plant according to claim 4. The guide member is configured to include a guide hole provided through the floating gate in the vertical direction, and a guide rail member that is slidably inserted into each guide hole.
The intake port protection device for a nuclear power plant according to claim 1.

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