Seawater sampling system

Abstract

To provide a seawater sampling system which can improve the maintenance property thereof.SOLUTION: A seawater sampling system for monitoring the concentration of radiation in a sea area around a nuclear power plant includes: a water intake facility provided at the top edge of a breakwater extending from a land to sea to take seawater from sea; a land facility provided on a land; a laying member extending along the breakwater to connect the water intake facility and the land facility to each other; and a cover member provided along the edge part of the top end of the breakwater in a width direction to protrude upward from the top end, the laying member being inserted into the cover member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a seawater sampling system. [Background technology]

[0002] Nuclear power plants are located next to the sea, and treated water discharged from the nuclear power plants is discharged into the ocean. In order to assess the impact of such treated water on the ocean, the radioactivity concentration of seawater sampled from the ocean is measured. For example, Patent Document 1 discloses an example of a seawater sampling system. In this seawater sampling system, a water pipe drawn from a drum on land is laid along the seabed to offshore, and seawater samples are collected from the seabed far from land. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility model registration No. 3198945 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the seawater sampling system of Patent Document 1, the water supply pipe is almost entirely below the seawater surface, so it is susceptible to corrosion by seawater. This causes a problem of increased maintenance frequency. In addition, when performing maintenance on the water supply pipe, the water intake pipe that extends offshore must be wound up on a drum, making the work complicated.

[0005] The present invention has been made in consideration of the above problems, and provides a seawater sampling system that can improve maintainability. [Means for solving the problem]

[0006] In order to solve the above problems, the seawater sampling system disclosed herein is a seawater sampling system for monitoring radiation concentrations in the sea area surrounding a nuclear power plant, and comprises a water intake equipment provided at the end of a breakwater extending from land toward the ocean and taking in seawater from the ocean, on-shore equipment provided on the land, a laying member extending along the breakwater to connect the water intake equipment and the on-shore equipment, and a cover member provided along the widthwise edge at the top of the breakwater and protruding upward from the top, through the inside of which the laying member is inserted.

[0007] The seawater sampling system disclosed herein is a seawater sampling system for monitoring radiation concentrations in the sea area around a nuclear power plant, and comprises: a water intake facility provided at the end of a breakwater extending from land toward the ocean for taking in seawater from the ocean; on-shore equipment provided on the land and having a filter for removing impurities from the seawater and a radiation detection unit for detecting radiation in the seawater that has passed through the filter; a water supply pipe extending along the breakwater for transporting the seawater taken in by the water intake facility to the on-shore equipment; and a power cable and a signal cable extending along the breakwater for connecting the water intake facility to the on-shore equipment. Effect of the Invention

[0008] According to the seawater sampling system of the present disclosure, maintainability can be improved. [Brief description of the drawings]

[0009] [Figure 1] 1 is a plan view showing an installation mode of a seawater sampling system according to a first embodiment. FIG. [Diagram 2] 1 is a schematic side view showing a general configuration of a seawater sampling system according to a first embodiment. FIG. [Diagram 3] 1 is a plan view of a breakwater on which a seawater sampling system according to a first embodiment is installed. FIG. [Figure 4]FIG. 2 is a cross-sectional view of a longitudinal section of a breakwater of the seawater sampling system according to the first embodiment. [Diagram 5] A cross-sectional view of the cover member and the installation member of the seawater sampling system according to the first embodiment. [Figure 6] A side view of the cover member and connection cover of the seawater sampling system according to the second embodiment. [Figure 7] A side view of the seawater sampling system according to the second embodiment with the connection cover removed from the cover member. [Figure 8] A side view showing the cover member of the seawater sampling system according to the third embodiment fixed to the top end. [Figure 9] A side view showing the cover member of the seawater sampling system according to the fourth embodiment fixed to the top end. [Figure 10] FIG. 13 is a schematic side view showing a general configuration of a seawater sampling system according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] First Embodiment Next, a first embodiment of a seawater sampling system 10 according to the present disclosure will be described with reference to Figures 1 to 5. As shown in Figures 1 and 2, the seawater sampling system 10 is provided across land 1 and the tip of a breakwater 5.

[0011] A nuclear power plant is installed on land 1 shown in Fig. 1. Treated water from the nuclear power plant is discharged into the surrounding sea area. The seawater sampling system 10 of this embodiment takes seawater as a sample from the ocean 2 in the sea area surrounding the nuclear power plant and monitors the radiation concentration in the sample.

[0012] The breakwater 5 is a structure that extends from the land 1 toward the ocean 2. The breakwater 5 extends in a direction along the coastline as it approaches the ocean 2. As a result, a bay 3 is formed on one side of the breakwater 5 in the width direction (the bay side 5b side shown in Figures 3 and 4), and the open ocean 4 spreads out on the other side of the breakwater 5 in the width direction (the open ocean side 5c side shown in Figures 3 and 4). A wave-dissipating zone 6 consisting of a large number of tetrapods 6a (see Figures 3 and 4) is provided on the open ocean 4 side of the breakwater 5 along the extension direction of the breakwater 5.

[0013] <Seawater sampling system> As shown in FIG. 2, the seawater sampling system 10 includes a water intake facility 20, an on-shore facility 30, an installation member 40, and a cover member 50.

[0014] <Water intake equipment> The water intake facility 20 is a facility for taking in seawater as a sample from the ocean 2. The water intake facility 20 is provided at the tip of the breakwater 5. The water intake facility 20 has a water intake building 21, a water intake pipe 22, a protective tube 23, a water intake pump 24, a cyclone separator 25, a sterilization device 26, a settling tank 27, a water supply pump 28, and a power distribution unit and a signal transmission / reception unit 29.

[0015] <Water intake building> The water intake building 21 is provided on the tip of the breakwater 5, that is, at the tip of the top end 5a, which is the upper surface of the breakwater 5, facing the ocean 2. The water intake building 21 houses various devices of the water intake facility 20. The intake pipe 22 is a pipe for taking in seawater from the ocean 2, and extends vertically at the tip of the breakwater 5. The lower part of the intake pipe 22 is located below the seawater level, and the lower end serves as an intake port for taking in seawater. The upper part of the intake pipe 22 is exposed above the seawater level. The upper part of the intake pipe 22 is bent horizontally and located above the top end 5a. The intake pipe 22 is fixed to the breakwater 5.

[0016] <Protective tube> The protective tube 23 is a cylindrical member for protecting the water intake pipe 22. The protective tube 23 is made of a porous structural material such as a mesh or a porous plate. The protective tube 23 extends vertically so as to surround the water intake pipe 22. The protective tube 23 prevents relatively large garbage, seaweed, etc. from being sucked into the water intake pipe 22.

[0017] <Water intake pump> The water intake pump 24 is provided in the water intake building 21. The water intake pump 24 is connected to an end of the water intake pipe 22 opposite to the water intake port. When the water intake pump 24 is driven, seawater is taken in through the water intake pipe 22. The cyclone separator 25 is connected to the rear of the pump inside the water intake building 21. Seawater that has passed through the pump is guided to the cyclone separator 25. The cyclone separator 25 uses a centrifugal separation method to remove foreign matter that could not be captured by the protective tube 23 from the seawater.

[0018] <Sterilization device> The sterilization device 26 is connected to the downstream of the cyclone separator 25 inside the water intake building 21. The seawater from which foreign matter has been removed by the cyclone separator 25 is guided to the sterilization device 26. The sterilization device 26 sterilizes the seawater by irradiating it with sterilizing light such as ultraviolet light, for example, to prevent the proliferation of marine organisms in the downstream system. The settling tank 27 is connected to the rear stage of the sterilization device 26 inside the water intake building 21. The seawater sterilized by the sterilization device 26 is led to the settling tank 27. In the settling tank 27, relatively fine impurities that could not be removed by the cyclone separator 25 are precipitated, and the impurities are removed from the seawater.

[0019] <Water pump> The water supply pump 28 is connected to the rear stage of the settling tank 27 inside the water intake building 21. The water supply pump 28 sends out the seawater from which impurities have been removed in the settling tank 27 to the outside of the water intake building 21. In this way, in the water intake building 21, seawater flows through the water intake pump 24, cyclone separator 25, sterilization device 26, settling tank 27 and water supply pump 28 in that order.

[0020] <Power distribution section and signal transmission / reception section> The power distribution unit and signal transmission / reception unit 29 is provided in the water intake building 21. The power distribution unit and signal transmission / reception unit 29 distributes power supplied from the outside to various devices in the water intake building 21, and at the same time transmits signals to the various devices to control them. It also transmits signals to and receives signals from onshore facilities.

[0021] <Land-based facilities> The onshore facility 30 is a facility for analyzing and monitoring the seawater taken in by the water intake facility 20. The onshore facility 30 is provided on land 1. The onshore facility 30 has an onshore building 31, a buffer tank 32, a sampler pump 33, a filter 34, a radiation detection unit 35, a radiation monitor device 36, and a power supply unit and a signal transmission / reception unit 37.

[0022] <Onshore building> The onshore building 31 is provided on the land 1 near the end of the breakwater 5 on the land 1 side. The onshore building 31 houses various devices of the onshore facility 30. <Buffer tank> The buffer tank 32 is provided in the onshore building 31 and temporarily stores the seawater taken in by the water intake facility 20 . <Sampler pump> The sampler pump 33 is provided in the onshore building 31 at the rear of the buffer tank 32. The sampler pump 33 pumps seawater stored in the buffer tank 32 out of the buffer tank 32.

[0023] <filter> The filter 34 is provided in the onshore building 31 after the sampler pump 33. The filter 34 removes fine impurities that could not be removed by the protective tube 23, the cyclone separator 25, and the settling tank 27. Examples of fine impurities include minute marine organisms. The filter 34 removes impurities by filtration. Therefore, during maintenance of the filter 34, work such as backwashing with seawater or water, or manual cleaning is required.

[0024] <Radiation detection section> The radiation detection unit is provided after the filter in the onshore building 31. The radiation detection unit detects the radiation concentration in the seawater that has passed through the filter . The radiation detection unit 35 may be, for example, a gamma ray measuring device, a beta ray measuring device, or even a tritium measuring device. These measuring devices may be provided in parallel with each other, and seawater may be introduced into each of them. Also, a plurality of filters 34 may be provided corresponding to each measuring device.

[0025] In this manner, within the onshore building 31, seawater flows through the buffer tank 32, the sampler pump 33, the filter 34, and the radiation detection unit 35 in that order. The seawater after the radiation concentration has been detected by the radiation detection unit 35 is discharged into the ocean 2, for example, via a pipe (not shown).

[0026] <Radiation monitor device> The radiation monitor device 36 is provided in the onshore building 31, and is electrically connected to the radiation detection unit 35. Data relating to the radiation concentration detected by the radiation detection unit 35 is transmitted to the radiation monitor device 36. The radiation monitor device 36 monitors and records the received data relating to the radiation concentration over time. The radiation monitor device 36 may be configured to issue an alarm when the radiation concentration exceeds a predetermined threshold value.

[0027] <Power supply unit and signal transmission / reception unit> The power supply unit and signal transmission / reception unit 37 is provided in the onshore building 31, and is connected to an external power system or an emergency power source. The power supply unit and signal transmission / reception unit 37 supplies power to various devices of the onshore facility 30, and also supplies power to the power distribution unit and signal transmission / reception unit 29 of the water intake facility 20 via a power supply and signal cable 42 (also referred to as a power cable 42) described later, to transmit and receive signals.

[0028] <Installation materials> 1 and 2, the installation member 40 connects the water intake facility 20 and the onshore facility 30. The installation member 40 extends along the breakwater 5 on the top end 5a of the breakwater 5. As shown in Fig. 2, the installation member 40 of this embodiment is a cord-like member including a water supply pipe 41 and a power supply and signal cable 42.

[0029] <Water pipe> The water supply pipe 41 is a pipe that sends seawater obtained by the water intake facility 20 to the onshore facility 30. The upstream end of the water supply pipe 41 in the seawater flow direction passes through the water intake building 21 of the water intake facility 20 and is connected to the water supply pump 28 in the water intake building 21. The downstream end of the water supply pipe 41 in the seawater flow direction passes through the onshore building 31 of the onshore facility 30 and is connected to the buffer tank 32 in the onshore building 31. As a result, seawater sent out by the water supply pump 28 is supplied to the buffer tank 32 via the water supply pipe 41.

[0030] <Power and signal cables> The power supply and signal cable 42 is a cable for supplying power and signals to the power distribution unit and signal transmission / reception unit 29 of the water intake facility 20. One end of the power supply and signal cable 42 is connected to the power supply unit and signal transmission / reception unit 37 in the onshore facility 30, and the other end of the power supply and signal cable 42 is connected to the power distribution unit and signal transmission / reception unit 29 of the water intake facility 20. In other words, the power supply and signal cable 42 electrically connects the power supply unit and signal transmission / reception unit 37 and the power distribution unit and signal transmission / reception unit 29. The power supply and signal cable 42 extends so as to be installed in parallel with the water supply pipe 41.

[0031] <Cover material> As shown in FIGS. 1 and 2, the cover member 50 is provided across the water intake facility 20 and the land facility 30 so as to cover the laying member 40 on the top end 5a of the breakwater 5. 3 and 4, the cover member 50 extends in the extension direction of the breakwater 5 along the edge of the top end 5a of the breakwater 5 on the bay 3 side. The cover member 50 is provided so as to protrude upward from the top end 5a.

[0032] The installation members 40 are provided across the water intake facility 20 and the onshore facility 30 so as to pass through the inside of the cover members 50. In this embodiment, a plurality of cover members 50 are provided so as to be in contact with each other in the extending direction of the top end 5a of the breakwater 5. In this way, the cover members 50 cover the installation members 40 in the entire area from the water intake facility 20 to the onshore facility 30.

[0033] Here, the cover member 50 is provided along the edge of the top end 5a on the bay 3 side in the width direction, so that most of the top end 5a is exposed. In this way, the exposed part of the top end 5a is ensured to be wide enough for the vehicle V to pass through. Therefore, the vehicle V can travel on the top end 5a from the land to the tip of the breakwater 5.

[0034] <Detailed structure of the cover member> Next, a detailed structure of the cover member 50 will be described with reference to Fig. 5. The cover member 50 has a bottom plate portion 51, a pair of side walls 52, 52, and a top plate portion 53.

[0035] The bottom plate portion 51 is a plate-like member extending horizontally, and is made of a metal such as stainless steel or anti-rust treated aluminum. The bottom plate portion 51 has a rectangular shape with the extension direction of the breakwater 5 as the longitudinal direction. The lower surface of the bottom plate portion 51 is fixed onto the top end 5a. The edge of the bottom plate portion 51 on the bay 3 side is disposed along the edge of the top end 5a on the bay 3 side. The width dimension of the bottom plate portion 51 is sufficiently shorter than the width dimension of the top end 5a.

[0036] A pair of side walls 52, 52 are provided on the bottom plate 51, spaced apart in the width direction of the bottom plate 51. The side wall 52 is made of a member whose longitudinal direction is the extension direction of the breakwater 5. The bottom plate 51 is made of a hollow rectangular steel material. The cross-sectional shape of the side wall 52 perpendicular to the extension direction is a rectangular pipe whose longitudinal direction is the up-down direction. This ensures that the side wall 52 has sufficient strength against external forces. The pair of side walls 52, 52 are provided along the edges of the bottom plate portion 51 in the width direction. The pair of side walls 52, 52 are firmly fixed to the bottom plate portion 51 by, for example, welding. Note that the pair of side walls 52, 52 may be detachably fixed to the bottom plate portion 51 via bolts.

[0037] The top plate portion 53 is a plate-like member that extends horizontally, similar to the bottom plate portion 51, and is made of a metal such as stainless steel or anti-rust treated aluminum. Similar to the bottom plate portion 51, the top plate portion 53 is rectangular in shape with the extension direction of the breakwater 5 as the longitudinal direction. The top plate portion 53 is provided parallel to the bottom plate portion 51, spanning the upper ends of the pair of side plate portions. That is, both sides of the lower surface of the top plate portion 53 in the width direction are in contact with the upper ends of the pair of side wall portions 52, 52, respectively.

[0038] The widthwise edges of the top plate portion 53 are disposed along the widthwise outer edges of the pair of side wall portions 52, 52. That is, the bay 3 side edge of the top plate portion 53 is provided along the bay 3 side edge of the side wall portion 52, 52 that is located on the bay 3 side of the pair of side wall portions 52, 52. Also, the open ocean 4 side edge of the top plate portion 53 is provided along the open ocean 4 side edge of the side wall portion 52, 52 that is located on the open ocean 4 side of the pair of side wall portions 52, 52.

[0039] The top plate portion 53 is detachably fixed to the pair of side wall portions 52, 52 via bolts 54. In this embodiment, the pair of bolts 54 penetrate the top plate portion 53 at positions spaced apart in the width direction, and the pair of bolts 54 are fixed to one of the pair of side wall portions 52, 52 corresponding to each other, whereby the top plate portion 53 is detachably fixed integrally with the pair of side wall portions 52, 52.

[0040] The bottom plate 51, the pair of side walls 52, 52, and the top plate 53 have the same dimensions in the extension direction of the breakwater 5. An accommodation space extending in the extension direction of the breakwater 5 is defined inside the cover member 50 made up of these members. The installation member 40 is laid in the extension direction on the upper surface of the bottom plate 51 so as to be accommodated in this accommodation space. In this embodiment, both the water pipe 41 and the power and signal cable 42 of the installation member 40 are laid so as to crawl along the upper surface of the bottom plate 51.

[0041] <Action and effect> According to the seawater sampling system 10 configured as described above, seawater taken in by the water intake facility 20 at the tip of the breakwater 5 is sent to the onshore facility 30 via the water supply pipe 41. In the onshore facility 30, impurities are finally removed from the seawater by the filter 34, and then the radiation concentration is detected by the radiation detection unit 35. The detection results are then acquired by the radiation monitor device 36, allowing the radiation concentration of the seawater to be appropriately monitored.

[0042] In this embodiment, seawater is taken from the ocean 2 at the tip of a breakwater 5 that is separated from the land 1. This makes it possible to appropriately obtain seawater suitable for measuring radiation concentration without having to take in seawater from offshore, which is further away from the land 1.

[0043] Furthermore, by providing the water intake facility 20 at the tip of the breakwater 5 in this way, the installation members 40 that connect the water intake facility 20 and the land facility 30 can be provided along the breakwater 5. If the installation members 40 were provided along the seabed, the frequency of maintenance would increase due to corrosion of the installation members 40 by seawater, and maintenance would require the installation members to be pulled up from the seabed, making the work complicated. In contrast, in this embodiment, the installation members 40 are provided on the breakwater 5, so the above-mentioned inconveniences can be avoided. Furthermore, if the installation members 40 are to be installed on the bay side 5b or ocean side 5c of the breakwater 5, for example, the installation members 40 must be attached to vertical walls, making the installation work complicated. In contrast, the installation members 40 can be installed only on the top edge 5a of the breakwater 5, reducing installation costs.

[0044] Furthermore, because the installation member 40 is covered by the cover member 50, the installation member 40 itself can be protected from waves, ultraviolet rays, and other external forces. This improves the durability of the installation member 40 and reduces the frequency of maintenance.

[0045] Here, if the laying member 40 is laid carelessly on the top end 5a of the breakwater 5, the laying member 40 itself may pose a risk of the worker falling over, and may also obstruct a vehicle V traveling over the top end 5a.

[0046] In contrast, in this embodiment, the installation member 40 is covered over its entire length by the cover member 50 that protrudes upward from the top end 5a, which improves visibility for workers. This reduces the risk that a worker will trip over the installation member 40.

[0047] In addition, because the cover member 50 is provided along the edge of the top end 5a in the width direction, it is possible to prevent the cover member 50 itself from interfering with the travel of the vehicle V. Furthermore, such a cover member 50 functions as a car stopper on the side of the vehicle V, thereby preventing the vehicle V from departing from the top end 5a, and improving the safety of the travel of the vehicle V.

[0048] Here, the filter 34, which finally removes minute impurities from seawater, easily becomes clogged, and is the one that requires the most frequent maintenance among various devices and equipment. In addition, since the radiation detection unit 35 is a precision machine, the seawater that is introduced into the radiation detection unit 35 needs to have the final impurities removed by the filter 34 immediately before it is introduced. Therefore, the filter 34 and the radiation detection unit 35 are usually arranged adjacent to each other as a set. Under such circumstances, if the filter 34 and the radiation detection unit 35 are arranged on the water intake facility 20 side at the end of the breakwater 5, the worker needs to frequently go to the end of the breakwater 5 by walking or by vehicle V. Depending on the weather, there is a risk of wind and high tide, so it is preferable to minimize the frequency of going to the end of the breakwater 5.

[0049] In contrast, in this embodiment, the water pipe 41 as the installation member 40 is arranged along the breakwater 5, which makes it possible to arrange the filter 34 and the radiation detection unit 35 on land. Therefore, workers do not need to go to the tip of the breakwater 5 every time they perform frequent maintenance on the filter 34. This makes it possible to significantly reduce the labor of the workers, and to perform maintenance while ensuring the safety of the workers.

[0050] Moreover, the cover member 50 of this embodiment is configured such that the pair of side plate portions have higher rigidity than the bottom plate portion 51 and the top plate portion 53. This improves the durability of the cover member 50 against external forces from the width direction. Therefore, when the vehicle V attempts to deviate from the top end 5a in the width direction, the cover member 50 receives the vehicle V, thereby reliably preventing the vehicle V from falling from the top end 5a. In addition, since the cover member 50 can withstand wave forces repeatedly hitting it from the width direction, the maintenance frequency of the cover member 50 itself can be reduced, and the laying member 40 housed inside the cover member 50 can be reliably protected.

[0051] Furthermore, in this embodiment, since the top plate portion 53 of the cover member 50 is detachably attached to the pair of side wall portions 52, 52, the top plate portion 53 can be easily removed. This allows maintenance to be performed at any location in the extension direction of the laying member 40. This improves maintainability.

[0052] In this embodiment, the cover member 50 is provided on the breakwater 5 on the side of the bay 3 where the waves are relatively calm. Therefore, the effect of repeated wave force from the open ocean 4 can be reduced, and the durability of the cover member 50 and the durability of the laying member 40 protected by the cover member 50 can be improved.

[0053] Second Embodiment Next, a second embodiment of the present disclosure will be described with reference to Figures 6 and 7. In Figures 6 and 7, components similar to those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted. The second embodiment differs from the first embodiment in the structure between adjacent cover members 50 in the extension direction of the breakwater 5.

[0054] That is, in the second embodiment, the dimension in the extension direction of the bottom plate portion 51 of the cover member 50 is set to be larger than the dimension in the extension direction of the pair of side plate portions and the top plate portion 53. As a result, the bottom plate portion 51 is configured to protrude from the pair of side plate portions and the top plate portion 53 on both sides in the extension direction (both sides in the extension direction of the breakwater 5). Adjacent cover members 50 are arranged so that the ends in the extension direction of the bottom plate portions 51 are in contact with each other.

[0055] A connection cover 60 is provided at the connection point between the adjacent cover members 50. The connection cover 60 is provided so as to straddle the adjacent cover members 50. The connection cover 60 in this embodiment extends in the extension direction of the breakwater 5, and the cross-sectional shape perpendicular to the extension direction is a U-shape that opens downward. The connection cover 60 is arranged so as to contact the top plate parts 53 of the adjacent cover members 50 from above, and to contact the pair of side wall parts 52, 52 from the outside in the width direction. The connection cover 60 is detachably fixed to each of the adjacent cover members 50 via bolts 61.

[0056] In this embodiment, by adopting the above-mentioned configuration, it is possible to define an accommodation space in which the installation member 40 is accommodated by the cover member 50 and the connection cover 60 during normal operation, as shown in Fig. 6. On the other hand, during maintenance, it is possible to easily access the accommodation space by removing only the connection cover 60, as shown in Fig. 7. That is, by removing the connection cover 60, the storage space at the connection points of the adjacent cover members 50 in the storage space is exposed to the outside. This makes it easy to perform maintenance work such as visually checking the condition of the laying members 40 and cleaning the inside of the cover members 50 with a high-pressure washer.

[0057] Furthermore, for example, when the water pipe 41 as the installation member 40 is divided into several pieces in the extension direction and connected by couplers 62, or when the power and signal cable 42 is divided into several pieces in the extension direction and connected by connectors 63, the couplers 62 and connectors 63 can be arranged in the same positions as the connection cover 60 to further improve maintainability. That is, by removing the connection cover 60, the couplers 62 and connectors 63 can be easily accessed, so that the water pipe 41 and the power and signal cable 42 can be easily separated. This makes it easy to replace only the defective parts of the water pipe 41 and the power and signal cable 42.

[0058] <Third embodiment> Next, a third embodiment of the present disclosure will be described with reference to Fig. 8. In Fig. 8, components similar to those in the other embodiments are given the same reference numerals, and detailed description thereof will be omitted. The cover member 50 of the third embodiment is detachably attached to the top end 5a via an anchor bolt 70. That is, a plurality of female thread anchors 71 are embedded at intervals in the extension direction of the top end 5a of the breakwater 5. Correspondingly, male threads 72 are provided in the bottom plate portion 51 of the cover member 50 so as to protrude downward from the bottom plate portion 51. By fastening the male threads 72 to the female thread anchors 71, the cover member 50 can be detachably fixed to the top end 5a.

[0059] As a result, the cover member 50 can be easily fixed onto the top end 5a of the existing breakwater 5 by retrofitting the female thread anchor 71 into the top end 5a. Also, when replacing the cover member 50, the cover member 50 can be easily removed and replaced with a new cover member 50. Furthermore, since the cover member 50 can be attached to the breakwater 5 later in this manner, there is no need to integrally provide a structure for protecting the laying member 40 to the breakwater 5 at the time of construction of the breakwater 5.

[0060] <Fourth embodiment> Next, a fourth embodiment of the present disclosure will be described with reference to Fig. 9. In Fig. 9, components similar to those in the other embodiments are given the same reference numerals, and detailed description thereof will be omitted. In the fourth embodiment, a spacer 80 is provided between the cover member 50 and the top end 5a. A plurality of spacers 80 may be provided at intervals in the extension direction of the breakwater 5. The thickness of the spacer 80 in the vertical direction may be any dimension. This allows the cover member 50 to be arranged in a horizontally aligned state even if the top end 5a of the breakwater 5 has irregularities.

[0061] Furthermore, a hole 51a penetrating in the vertical direction is formed in the bottom plate portion 51 of the cover member 50. The hole 51a is formed in a portion where a gap is created between the top end 5a and the lower surface of the bottom plate due to the presence of the spacer 80. As a result, even if rainwater or seawater penetrates inside the cover member 50, the rainwater or seawater can be easily drained through the holes 51a. Therefore, corrosion of the cover member 50 and the laying member 40 can be suppressed.

[0062] <Other embodiments> Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included.

[0063] 10, the filter 34 and the radiation detection unit 35 may be provided in a water intake building 21 as the water intake facility 20. In this case, the water supply pipe 41 in the embodiment does not need to be provided, and instead of the water supply pipe 41, a communication and signal cable 43 (also referred to as a communication cable 43) that electrically connects the radiation monitor device 36 on the water intake facility 20 side and the radiation monitor device 36 on the land facility 30 side needs to be provided as the installation member 40. In other words, the cover member 50 has the role of protecting the power cable 42 and the communication cable 43.

[0064] As in the embodiment, this also makes it possible for the cover member 50 to protect the laying member 40, improving maintainability, and improving the safety of pedestrians and vehicles V.

[0065] In the embodiment, the cover member 50 is provided along the edge of the top end 5a on the bay 3 side, but this is not limited to this. That is, the cover member 50 may be provided along the edge of the top end 5a on the open ocean 4 side. Also, the cover member 50 may be provided on both the open ocean 4 side and the bay 3 side, and a laying member 40 may be housed in each.

[0066] In addition, in the embodiment, the laying member 40 is protected by the cover member 50, but the laying member 40 may be laid along the breakwater 5 without providing the cover member 50. Even in this case, by using the water supply pipe 41 as the laying member 40 and providing the filter 34 and the radiation detection unit 35 on the land side, the number of times the equipment is dispatched to the water intake facility 20 can be reduced and maintainability can be improved.

[0067] <Additional Notes> The seawater sampling system 10 according to this embodiment can be understood as follows. (1) The seawater sampling system 10 comprises a water intake equipment 20 provided at the tip of a breakwater 5 extending from land 1 towards the ocean 2 and for taking in seawater from the ocean 2, on-shore equipment 30 provided on the land 1, a laying member 40 extending along the breakwater 5 to connect the water intake equipment 20 and the on-shore equipment 30, and a cover member 50 provided along the widthwise edge of the top end 5a of the breakwater 5 and protruding upward from the top end 5a, with the laying member 40 inserted inside.

[0068] As a result, the laying members 40 are installed on the breakwater 5, which improves the maintainability of the laying members 40 compared to when the laying members 40 are located below sea level. In addition, since the installation member 40 is inserted through a cable cover, the installation member 40 can be protected from waves, ultraviolet rays, and other external forces, reducing the frequency of maintenance. Furthermore, since the installation member 40 is covered with the cover member 50, it is easy for people to recognize, and the safety of maintenance workers can be ensured. In addition, when the vehicle V travels along the top end 5a of the breakwater 5, the cover member 50 itself functions as a vehicle stopper, thereby ensuring the safety of the vehicle V as it travels.

[0069] The seawater sampling system 10 of (2) is the seawater sampling system 10 of (1), in which the laying member 40 has a water supply pipe 41 that sends the seawater taken in by the water intake equipment 20 to the onshore equipment 30, and a power cable 42 that connects the water intake equipment 20 and the onshore equipment 30, and the onshore equipment 30 includes a filter 34 that removes impurities from the seawater sent by the water supply pipe 41, and a radiation detection unit 35 that detects the radiation concentration in the seawater that has passed through the filter 34.

[0070] Here, the filter 34, which removes impurities such as marine organisms from seawater, requires more frequent maintenance than other equipment. In this embodiment, since the filter 34 is provided on the land side, it is possible to reduce the frequency of dispatching to the water intake facility 20.

[0071] (3) The cover member 50 has a bottom plate portion 51 installed on the top end 5a and extending along the edge portion, a pair of side wall portions 52, 52 fixed to both sides of the width of the bottom plate portion 51, and a top plate portion 53 provided across the upper ends of the pair of side wall portions 52 and, together with the bottom plate portion 51 and the pair of side wall portions 52, defines a storage space through which the laying member 40 is inserted, and the pair of side wall portions 52 are square steel pipes having higher rigidity than the bottom plate portion 51 and the top plate portion 53.

[0072] Since the rigidity of the pair of side plate portions is set to be high, it can withstand external forces from waves while still functioning as a stopper for vehicles V traveling on the top edge 5a.

[0073] The seawater sampling system (4) is the seawater sampling system (3) in which the top plate portion 53 is detachably provided to the pair of side wall portions 52.

[0074] As a result, by removing the top plate portion 53 from the side wall portion 52, the installation member 40 that passes through the inside of the cover member 50 can be easily accessed.

[0075] The seawater sampling system (5) is the seawater sampling system (3) or (4) in which the bottom plate portion 51 is detachably provided on the top end 5a.

[0076] As a result, there is no need to integrally provide a structure for protecting the laying members 40 with the breakwater 5 when constructing the breakwater 5.

[0077] (6) The seawater sampling system is any of the seawater sampling systems (1) to (5), further comprising a spacer 80 interposed between the top end 5a and the bottom plate portion 51, and the bottom plate portion 51 has a hole portion 51a penetrating in the vertical direction to connect the storage space to the bottom of the bottom plate portion 51.

[0078] This allows the cover member 50 to be properly installed even if the top end 5a of the breakwater 5 is uneven, and also allows rainwater, seawater, etc. that has entered the cover member 50 to be discharged to the outside through the hole 51a.

[0079] The seawater sampling system (7) is a seawater sampling system of any of (1) to (6), in which a plurality of the cover members 50 are arranged across the water intake equipment 20 and the onshore equipment 30, and the cover members 50 are removably attached to straddle the adjacent cover members 50 at the connection points between the cover members 50, and a connection cover 60 is further provided that can be removed from the cover members 50 to expose the storage space.

[0080] This makes it possible to easily access the installation member 40 by removing the connection cover 60.

[0081] The seawater sampling system (8) is any of the seawater sampling systems (1) to (7), in which the breakwater 5 extends to form a bay 3, and the cover member 50 is provided along the edge of the top end 5a on the bay 3 side in the width direction.

[0082] In this way, by providing the cover member 50 on the side of the breakwater 5 facing the bay 3 where the waves are relatively calm, and then laying the laying member 40, the effects of waves can be reduced.

[0083] (9) The seawater sampling system is a seawater sampling system for monitoring radiation concentrations in the sea area around a nuclear power plant, and comprises: a water intake facility 20 provided at the tip of a breakwater 5 extending from land 1 toward ocean 2 for taking in seawater from the ocean 2; a land-based facility 30 provided on the land 1 and having a filter 34 for removing impurities from the seawater and a radiation detection unit 35 for detecting radiation in the seawater that has passed through the filter 34; a water supply pipe 41 extending along the breakwater 5 for sending the seawater taken in by the water intake facility 20 to the land-based facility 30; and a power supply and signal cable 42 extending along the breakwater 5 for connecting the water intake facility 20 and the land-based facility 30.

[0084] By arranging the water supply pipe 41 that transports the seawater taken in by the water intake facility 20 along the breakwater 5, the filter 34, which requires relatively frequent maintenance, can be provided on the land side. This makes it possible to reduce the frequency of visits to the water intake facility 20. [Explanation of symbols]

[0085] 1 land 2 ocean 3 bays 4 Open ocean 5 Breakwater 5a Top 5b Bay side 5c Open ocean side 6 Wave-dissipating zone 6a Tetrapod 10 Seawater Sampling System 20 Water intake equipment 21 Water Intake Building 22 Water intake pipe 23 Protective tube 24 Intake Pump 25 Cyclone Separator 26 Sterilization equipment 27 Sedimentation tank 28 Water Pump 29 Power distribution and signal transmission / reception units 30 Land Facilities 31 Onshore Building 32 Buffer Tank 33 Sampler Pump 34 Filters 35 Radiation detection unit 36 Radiation monitoring equipment 37 Power supply section 40 Installation materials 41 Water pipe 42 Power and signal cables (power cables) 43 Communication and signal cables (communication cables) 50 Cover member 51 Bottom plate part 51a Hole 52 Side wall 53 Top plate 54 Volts 60 Connection cover 61 Volts 62 Coupler 63 Connector 70 Anchor bolt 71 Female thread anchor 72 Male thread 80 Spacer V Vehicle

Claims

1. A seawater sampling system for monitoring radiation concentrations in sea areas around a nuclear power plant, comprising: a water intake facility provided at the tip of a breakwater extending from land toward the ocean, for taking in seawater from the ocean; On-shore facilities provided on the land; A laying member extending along the breakwater so as to connect the water intake facility and the land facility; a cover member provided along the edge in the width direction at the top end of the breakwater and protruding upward from the top end, the inside of which is inserted by the laying member; A seawater sampling system comprising:

2. The laying member is A water supply pipe that supplies seawater taken in by the water intake facility to the land facility; A power cable connecting the water intake facility and the land facility; having The onshore facility comprises: a filter for removing impurities from the seawater conveyed through the water supply pipe; a radiation detection unit that detects a radiation concentration in the seawater that has passed through the filter; 2. The seawater sampling system of claim 1, comprising:

3. The cover member is A bottom plate portion installed on the top end and extending along the edge portion; A pair of side walls fixed to both sides of the bottom plate in a width direction; a top plate portion that is provided across the upper ends of the pair of side wall portions and that, together with the bottom plate portion and the pair of side wall portions, defines an accommodation space through which the installation member is inserted; having The seawater sampling system according to claim 1 or 2, wherein the pair of side wall portions are made of square steel pipes having higher rigidity than the bottom plate portion and the top plate portion.

4. The seawater sampling system according to claim 3 , wherein the top plate portion is detachably attached to the side wall portion.

5. The seawater sampling system according to claim 3 , wherein the bottom plate portion is removably provided on the top end.

6. Further comprising a spacer interposed between the top end and the bottom plate portion, The seawater sampling system according to claim 3 , wherein the bottom plate portion has a hole portion penetrating in the vertical direction to communicate the storage space with a lower portion of the bottom plate portion.

7. A plurality of the cover members are arranged across the water intake facility and the land facility, The seawater sampling system of claim 3, further comprising a connecting cover that is removably arranged to span the connection points of adjacent cover members and that exposes the storage space when removed from the cover members.

8. The breakwater extends to form a bay; The seawater sampling system according to claim 1 or 2, wherein the cover member is provided along the edge of the top end on the bay side in the width direction.

9. A seawater sampling system for monitoring radiation concentrations in sea areas around a nuclear power plant, comprising: A water intake facility is provided at the tip of a breakwater extending from land toward the ocean and takes in seawater from the ocean; a land facility provided on the land, the land facility having a filter for removing impurities from the seawater and a radiation detection unit for detecting radiation in the seawater that has passed through the filter; A water supply pipe extending along the breakwater and supplying seawater taken in by the water intake facility to the land facility; A power supply and signal cable extending along the breakwater and connecting the water intake facility and the onshore facility; A seawater sampling system comprising:

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