Method for replenishing fire water tank of nuclear power ship

Abstract

This application relates to a method for replenishing fire-fighting water tanks on nuclear power plants, comprising: installing at least one fire-fighting freshwater tank on the nuclear power plant, the fire-fighting freshwater tank storing a preset capacity of freshwater; connecting the fire-fighting freshwater tank to the discharge end of an important plant water system on the nuclear power plant via a water replenishment pipeline; transporting the freshwater in the fire-fighting freshwater tank to the area requiring fire suppression, and when the water level in the fire-fighting freshwater tank drops to a preset level, allowing seawater discharged from the important plant water system to flow into the fire-fighting freshwater tank through the water replenishment pipeline. In the event of a fire, the stored freshwater is used first for fire suppression; since the fire-fighting freshwater tank is also connected to the discharge end of an existing important plant water system on the ship via a water replenishment pipeline, when the water level in the fire-fighting freshwater tank drops to the preset level, i.e., the freshwater volume is insufficient, seawater discharged from the important plant water system can be introduced into the fire-fighting freshwater tank as a supplementary water source.

Description

Technical Field

[0001] This application relates to the field of fire water supply technology, and in particular to a method for replenishing the fire water tank of a nuclear power plant ship. Background Technology

[0002] Nuclear power ships contain a large number of flammable materials such as cables, lubricating oil, and diesel fuel. Due to the confined space of the hull, once a fire breaks out, it spreads rapidly and is difficult to extinguish. Therefore, extremely high demands are placed on the reliability of the fire-fighting system of nuclear power ships. In particular, the selection of fire water sources is crucial for nuclear safety-related compartments such as the primary circuit, which must meet the demand for large amounts of water while avoiding the corrosion of expensive nuclear power equipment by seawater.

[0003] In related technologies, the fire water supply design for the primary loop section of nuclear power plants mainly refers to the relevant regulations and standards for onshore nuclear power plants. It typically employs large freshwater tanks to store sufficient freshwater to meet the initial fire-fighting water needs. For example, according to the "Code for Fire Protection Design of Nuclear Power Plants," the effective freshwater storage volume usually needs to reach at least 1200 cubic meters, and sometimes even a dual-tank design with one tank for use and one for standby is adopted, with a total volume reaching 2400 cubic meters.

[0004] While the conventional design can meet the requirements for fire water volume and corrosion prevention, the large freshwater tanks occupy a large portion of the ship's effective load, increase useless loads, and squeeze out the space and load that could be used to arrange other key nuclear power equipment. Summary of the Invention

[0005] Therefore, it is necessary to provide a method for replenishing the fire-fighting water tanks of nuclear power ships, which addresses the problem that the large freshwater tanks on existing nuclear power ships encroach on the space and load that could be used to accommodate other key nuclear power equipment.

[0006] This application provides a method for replenishing the fire-fighting water tanks of a nuclear power plant ship, including:

[0007] At least one fire-fighting freshwater tank is provided on the nuclear power ship, and the fire-fighting freshwater tank stores a preset capacity of freshwater;

[0008] The fire-fighting freshwater tank is connected to the drain end of the important plant water system on the nuclear power ship via a water supply pipeline.

[0009] The fresh water in the fire-fighting fresh water tank is transported to the area where fire needs to be extinguished, and when the water level in the fire-fighting fresh water tank drops to a preset level, seawater discharged from the important plant water system flows into the fire-fighting fresh water tank through the water replenishment pipeline.

[0010] In one embodiment, the method further includes: installing an electric valve on the water supply pipeline and connecting the electric valve to a controller signal; when the water level in the fire-fighting freshwater tank drops to a preset level, the controller controls the electric valve to open.

[0011] In one embodiment, the method further includes: placing a level gauge inside the fire-fighting freshwater tank and connecting the level gauge to the controller signal;

[0012] The controller compares the preset liquid level with the real-time liquid level detected by the liquid level gauge;

[0013] If the real-time liquid level is lower than the preset liquid level, the controller controls the electric valve to open, so that the seawater of the important plant water system can replenish the fire freshwater tank through the water replenishment pipeline.

[0014] If the real-time liquid level is greater than or equal to the preset liquid level, the controller controls the electric valve to close and stop water replenishment.

[0015] In one embodiment, the effective volume of the fire-fighting freshwater tank is configured such that the freshwater in the fire-fighting freshwater tank can at least meet the amount of fire-fighting freshwater required for a single fire extinguishing operation lasting 1 hour.

[0016] In one embodiment, a fire-fighting freshwater tank is provided on the port and starboard sides of the nuclear power ship, and both fire-fighting freshwater tanks are connected to the drain end of the important plant water system through water supply pipelines.

[0017] In one embodiment, the total effective volume of the two fire-fighting freshwater tanks is configured such that the freshwater in the two fire-fighting water tanks can at least meet the amount of fire-fighting freshwater required for a single fire extinguishing operation lasting 1 hour.

[0018] In one embodiment, the critical plant water system includes a heat exchanger, with one end of the water supply pipeline connected to the liquid outlet of the heat exchanger.

[0019] In one embodiment, the important plant water system further includes a subsea gate, a filter, a seawater intake pump, and a heat exchanger connected in sequence via pipelines, wherein seawater is configured to flow into the water supply pipeline after passing through the subsea gate, the filter, the seawater intake pump, and the heat exchanger in sequence.

[0020] In one embodiment, the fire-fighting freshwater tank is connected to the main fire-fighting water supply pipeline so as to provide fire-fighting water to the main fire-fighting water supply pipeline through the fire-fighting freshwater tank.

[0021] In one embodiment, a fire pump is installed on the main fire water supply pipeline to provide power for the fire water supply.

[0022] The aforementioned method for replenishing the fire-fighting water tanks on nuclear power plants involves installing fire-fighting freshwater tanks on the nuclear power plants and storing a preset capacity of freshwater in them. This allows the stored freshwater to be used for fire extinguishing in the event of a fire. Furthermore, since the fire-fighting freshwater tanks are connected to the drainage outlets of the existing important plant water systems on the ship via replenishment pipelines, when the water level in the fire-fighting freshwater tanks drops to the preset level, i.e., when the freshwater supply is insufficient, seawater discharged from the important plant water systems can be introduced into the fire-fighting freshwater tanks as a supplementary water source.

[0023] Because the fire-fighting freshwater tanks pre-store freshwater, they can provide fire-fighting water for the primary circuit compartments or other areas of the nuclear power plant ship that require firefighting in the early stages of a fire, avoiding the risk of corrosion to nuclear safety-related equipment from direct use of seawater. Furthermore, by connecting the water supply pipeline to the drain end of the critical plant water system, the system utilizes the filtered and sufficient flow of seawater from the critical plant water system as a supplementary water source when freshwater is insufficient. Moreover, there is no need to add separate seawater pumps, filters, or other equipment to the fire-fighting system, simplifying the structure and saving shipboard space.

[0024] Meanwhile, because the critical plant water system operates continuously to ensure reactor cooling, the filtered seawater discharged from it can continuously provide fire-fighting water after the fresh water is depleted, enhancing the continuous fire response capability of the nuclear safety area. Moreover, the entire water replenishment process relies only on the existing system's piping connections and controls, without adding any additional operational burden. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the connection between the fire-fighting water tank and the important plant water system provided in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of a structure with two fire-fighting water tanks provided in an embodiment of this application.

[0027] Figure 3 A flowchart illustrating the water replenishment method for fire-fighting water tanks on nuclear power plants provided in this application embodiment.

[0028] Figure label:

[0029] 100. Firefighting freshwater tank;

[0030] 200. Water supply pipeline; 210. Electric valve;

[0031] 300. Important plant water system; 310. Submarine gate; 320. Filter; 330. Seawater intake pump; 340. Heat exchanger;

[0032] 400. Controller;

[0033] 500. Level gauge;

[0034] 600. Fire water supply main pipeline; 610. Fire pump. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] Nuclear power ships (ship platforms in the nuclear power field) contain a large amount of flammable materials such as cables, lubricating oil, and diesel fuel. The confined space inside the ship means that once these flammable materials ignite, the fire is characterized by rapid spread, high temperatures, large amounts of smoke, and difficulty in firefighting. In the event of a fire, a large amount of fire-fighting water is required for cooling and extinguishing.

[0042] Currently, there are no domestic standards for nuclear power plant ship platforms, and the description of the water fire protection system for the primary loop compartment of nuclear power ships is blank. The design basis of the fire protection water system for the primary loop compartment of nuclear power plant ship platforms in China all refer to the relevant regulations and standards for land-based large-scale nuclear power plants, mainly the "Safety Design Regulations for Nuclear Power Plants" (HAF102-2016), "Fire Protection and Explosion Protection Design of Nuclear Power Plants" (HAD102.11-2019), and "Code for Fire Protection Design of Nuclear Power Plants" (GB / T22158-2021), etc.

[0043] Given the high cost of nuclear power equipment, the corrosion caused by seawater to the primary circuit compartments if seawater is used directly for fire fighting would be a significant concern. Therefore, the fire fighting design for the primary circuit compartments of the ship platform requires the use of fresh water. The effective volume of fresh water storage should not be less than 1200 m³ as required by Clause 9.3.2 of the "Code for Fire Protection Design of Nuclear Power Plants" (GB / T22158-2021). 3 The ship has a huge water storage capacity, which is correct for the fire safety of the ship platform. However, the fire water stored on it occupies a huge amount of useless load on the hull.

[0044] Therefore, this application provides a method for replenishing the fire-fighting water tanks of nuclear power plants, such as... Figure 1 and Figure 3 As shown, it includes:

[0045] At least one fire-fighting freshwater tank 100 is installed on the nuclear power ship, and the fire-fighting freshwater tank 100 stores a preset capacity of freshwater;

[0046] The fire-fighting freshwater tank 100 is connected to the drain end of the important plant water system 300 on the nuclear power plant ship through the water supply pipeline 200;

[0047] The fresh water in the fire-fighting fresh water tank 100 is transported to the area where fire needs to be extinguished. When the water level in the fire-fighting fresh water tank 100 drops to the preset level, the seawater discharged from the important plant water system 300 is controlled to flow into the fire-fighting fresh water tank 100 through the water replenishment pipe 200.

[0048] The aforementioned method for replenishing the fire-fighting water tank on a nuclear power plant ship involves installing a fire-fighting freshwater tank 100 on the ship, which stores a preset capacity of freshwater. This allows the stored freshwater to be used for fire suppression in the event of a fire. Furthermore, the fire-fighting freshwater tank 100 is connected to the drain end of the ship's existing important plant water system 300 via a water replenishment pipeline 200. When the water level in the fire-fighting freshwater tank drops to a preset level, i.e., when the freshwater supply is insufficient, seawater filtered by the important plant water system 300 can be introduced into the fire-fighting freshwater tank 100 as a supplementary water source.

[0049] Because the fire-fighting freshwater tank 100 pre-stores freshwater, it can provide fire-fighting water for the primary circuit compartments or other areas of the nuclear power plant ship that require firefighting in the early stages of a fire, avoiding the risk of corrosion to nuclear safety-related equipment caused by direct use of seawater. Furthermore, by connecting the makeup water pipeline 200 to the drain end of the critical plant water system 300, the seawater in the critical plant water system 300, which has already been filtered and has a sufficient flow rate, can be used as a supplementary water source when the freshwater supply is insufficient. Moreover, there is no need to add separate seawater pumps, filters 320, or other equipment to the fire-fighting system, simplifying the structure and saving shipboard space.

[0050] Meanwhile, because the critical plant water system 300 operates continuously to ensure reactor cooling, the filtered seawater discharged from it can continuously provide fire-fighting water after the fresh water is depleted, enhancing the continuous fire response capability of the nuclear safety area. Moreover, the entire water replenishment process relies only on the existing system's piping connections and controls, without adding any additional operational burden.

[0051] It should be noted that in the core logic of fire emergency response, firefighting is the primary task, while corrosion prevention is a subsequent remedial issue. This method adopts a "freshwater first, then seawater" firefighting strategy:

[0052] First and foremost, ensuring nuclear safety, controlling the spread of the fire, and preventing secondary disasters are the most urgent and critical objectives during a fire. Compared to the potential corrosive risks of seawater to equipment, the safety threat posed by an uncontrolled fire is more direct and severe. Therefore, introducing seawater as a supplementary water source after freshwater is depleted is to ensure the fire suppression system can continue to operate and to prevent the fire from reigniting or escalating due to water supply interruption.

[0053] Secondly, the window of opportunity for seawater to enter the fire-fighting freshwater tank and pipeline system is limited. Furthermore, the seawater supplied by critical plant water systems is only activated for replenishment when the fire lasts for an extended period. Therefore, the residence time of seawater in the fire-fighting system is relatively short, and it can be cleaned and restored through subsequent operations after the fire is extinguished.

[0054] In addition, after the fire is extinguished, nuclear power ships can use fresh water to clean fire-fighting fresh water tanks, water replenishment pipelines, main fire-fighting water supply pipelines, related valves, and key nuclear power equipment areas when docked at a pier or safe anchorage; they can also dry and inspect equipment affected by seawater.

[0055] It should be noted that the full English name of the critical plant water system 300 is Service Water System, abbreviated as SWS system. It is a system that provides circulating cooling water for the primary loop nuclear island reactor. The critical plant water system 300 is equipped with sufficient redundancy design for water pumps, control, power supply, etc., and can operate 24 / 7 without interruption. It continuously removes the reactor cooling waste heat through plate heat exchanger 340, and the circulating water volume can reach 1000 m³ / h, which is much greater than the fire protection design flow of about 200 m³ / h.

[0056] In one embodiment, such as Figure 1 and Figure 3 As shown, it also includes: installing an electric valve 210 on the water supply pipeline 200 and connecting the electric valve 210 to the controller 400 via signal connection. When the water level in the fire-fighting freshwater tank 100 drops to a preset level, the controller 400 controls the electric valve 210 to open. By installing the electric valve 210 on the water supply pipeline 200 and connecting it to the controller 400 via signal connection, the opening and closing of the water supply pipeline 200 can be remotely or automatically controlled. Compared to the method of requiring personnel to operate the valve on-site, remote or automatic control not only avoids the risk of personnel going to the dangerous area to operate during a fire, but also ensures that the transmission of control commands is faster, ensuring that seawater from the important plant water system 300 can be introduced into the fire-fighting freshwater tank 100 as needed, avoiding ineffective or excessive water replenishment.

[0057] In one embodiment, such as Figure 1 and Figure 3As shown, it also includes: installing the level gauge 500 inside the fire-fighting freshwater tank 100 and connecting the level gauge 500 to the controller 400 via signal;

[0058] The controller 400 compares the preset liquid level with the real-time liquid level detected by the level gauge 500;

[0059] If the real-time liquid level is lower than the preset liquid level, the controller 400 controls the electric valve 210 to open, so that the seawater of the important plant water system 300 can be replenished to the fire freshwater tank 100 through the water replenishment pipeline 200.

[0060] If the real-time liquid level is greater than or equal to the preset liquid level, the controller 400 controls the electric valve 210 to close and stop water replenishment.

[0061] By installing a level gauge 500 inside the fire-fighting freshwater tank 100 and connecting it to the controller 400, the controller 400 can acquire real-time level data of the fire-fighting freshwater tank 100 and compare it with a preset level. When the real-time level is lower than the preset level, the controller 400 automatically controls the electric valve 210 to open, achieving automatic water replenishment; when the level recovers to the preset upper limit, the controller 400 automatically closes the electric valve 210, stopping water replenishment. The entire process requires no manual intervention, ensuring timely water replenishment during a fire while preventing excessive replenishment that could lead to freshwater tank overflow or seawater waste. Simultaneously, the level gauge 500 provides the control room personnel with an intuitive means of monitoring the water level, facilitating remote manual intervention when necessary.

[0062] In one embodiment, the effective volume of the fire-fighting freshwater tank 100 is configured such that the freshwater in the fire-fighting freshwater tank 100 can at least meet the amount of freshwater required for a single fire suppression operation lasting 1 hour. By configuring the effective volume of the fire-fighting freshwater tank 100 to at least meet the amount of freshwater required for a single fire suppression operation lasting 1 hour, the fire-fighting freshwater tank 100 can provide a sufficient supply of freshwater in the early stages of a fire, ensuring that there is enough time and water for initial fire suppression when a fire occurs in the primary circuit compartment or other areas of the nuclear power plant ship that require fire suppression.

[0063] In one embodiment, the effective volume of the fire-fighting freshwater tank 100 is configured such that the freshwater in the fire-fighting freshwater tank 100 can meet the fire-fighting freshwater volume required for at least 2 hours of continuous fire extinguishing, so that the fire-fighting freshwater tank 100 can provide sufficient freshwater supply in the early stage of a fire.

[0064] In one embodiment, such as Figure 2As shown, a fire-fighting freshwater tank 100 is installed on both the port and starboard sides of the nuclear power plant ship, and both fire-fighting freshwater tanks 100 are connected to the drain end of the important plant water system 300 via water replenishment pipes 200. By installing one fire-fighting freshwater tank 100 on each side of the nuclear power plant ship, the space on both sides of the hull is utilized, resulting in a more balanced freshwater storage, which is beneficial to hull balance and stability. At the same time, connecting both fire-fighting freshwater tanks 100 to the drain end of the important plant water system 300 ensures that both fire-fighting freshwater tanks 100 can be replenished. The two fire-fighting freshwater tanks 100 serve as backups for each other. When one freshwater tank is unavailable due to maintenance, malfunction, or unilateral fire, the other freshwater tank can still provide fire-fighting water, improving the redundancy of the fire-fighting water source and the reliability of the system.

[0065] In one embodiment, the total effective volume of the two fire-fighting freshwater tanks 100 is configured such that the freshwater in the two tanks can at least meet the freshwater requirements for a single fire suppression operation lasting one hour. By configuring the total effective volume of the two fire-fighting freshwater tanks 100 to meet the freshwater requirements for a single fire suppression operation lasting one hour, the two tanks share the task of storing fire-fighting freshwater. This total volume allocation method ensures the total amount of freshwater required for initial fire suppression while allowing for a suitable reduction in the volume of each compartment, thereby reducing the space and structural requirements of individual compartments on the hull and facilitating their separate arrangement on the port and starboard sides to adapt to the limited space on both sides of the hull.

[0066] In one embodiment, the effective volume of two fire-fighting freshwater tanks 100 is configured such that the freshwater in the two fire-fighting freshwater tanks 100 can meet the fire-fighting freshwater volume required for at least 2 hours of continuous fire extinguishing, so that the fire-fighting freshwater tanks 100 can provide sufficient freshwater supply in the early stage of a fire.

[0067] In one embodiment, such as Figure 1 As shown, the critical plant water system 300 includes a heat exchanger 340, with one end of the makeup water pipe 200 connected to the outlet of the heat exchanger 340. By connecting one end of the makeup water pipe 200 to the outlet of the heat exchanger 340 in the critical plant water system 300, the seawater introduced into the fire-fighting freshwater tank 100 is discharged seawater that has already undergone heat exchange in the heat exchanger 340. This portion of seawater was originally intended to be discharged into the sea as low-temperature hot wastewater. Using it as fire-fighting water not only achieves wastewater reuse but also avoids interference with the main circulation process of the critical plant water system 300. In addition, because the seawater temperature at the outlet of the heat exchanger 340 is low, using it as fire-fighting water will not cause thermal stress damage to fire-fighting pipes and equipment due to high temperature, nor will it have an adverse impact on the fire scene. At the same time, the seawater discharged from the heat exchanger 340 has undergone pre-filtration treatment, making the water clean and suitable for fire-fighting spraying, ensuring the reliability and safety of the fire-fighting system operation.

[0068] It should be noted that the low-temperature hot wastewater discharged into the sea after heat exchanger 340 of the important plant water system 300 is non-radioactive. It poses no risk of radioactive pollution when used as a secondary fire-fighting water source and can be safely used for fire extinguishing in the primary circuit compartment.

[0069] In one embodiment, such as Figure 1 As shown, the critical plant water system 300 also includes a subsea gate 310, a filter 320, a seawater intake pump 330, and a heat exchanger 340 connected sequentially via pipelines. Seawater is configured to flow into the makeup water pipeline 200 after passing through the subsea gate 310, filter 320, seawater intake pump 330, and heat exchanger 340 in sequence. The critical plant water system 300's structure, with the seawater passing through the subsea gate 310, filter 320, seawater intake pump 330, and heat exchanger 340 before connecting to the makeup water pipeline 200, ensures that the seawater entering the makeup water pipeline 200 undergoes a complete pretreatment process. The seawater is first coarsely filtered by the subsea gate 310 and then finely filtered by the filter 320, removing large particles such as marine organisms and silt, ensuring water cleanliness and preventing impurities from clogging fire sprinklers or pipes. The seawater intake pump 330 provides power for the seawater flow, ensuring sufficient water pressure and flow rate to enter the fire-fighting freshwater tank 100 when makeup water is needed. The critical plant water system 300 forms a complete water supply chain. Utilizing existing equipment and its continuous operation, it provides a stable, clean, and sufficient water source for fire-fighting water replenishment without requiring additional filtration and power equipment for the fire-fighting system.

[0070] It should be noted that the seabed gate 310 is a seawater intake located on the hull of the nuclear power plant ship. It is used to initially filter large debris in the seawater and provide an initial water intake channel for the important plant water system 300.

[0071] In one embodiment, such as Figure 1 As shown, the fire-fighting freshwater tank 100 is connected to the main fire-fighting water supply pipeline 600, so that fire-fighting water can be supplied to the main fire-fighting water supply pipeline 600 through the fire-fighting freshwater tank 100. By connecting the fire-fighting freshwater tank 100 to the main fire-fighting water supply pipeline 600, the fire-fighting freshwater tank 100 can directly supply fire-fighting water to the main fire-fighting water supply pipeline 600, achieving seamless connection between freshwater storage and fire-fighting water supply. When a fire occurs, the freshwater in the fire-fighting freshwater tank 100 can be quickly transported to each fire sprinkler head or fire hydrant through the main pipeline, ensuring the timely initiation of fire-fighting operations. At the same time, when the fire-fighting freshwater tank 100 is replenished with seawater, seawater can also continue to be supplied through the same main pipeline, achieving a smooth switch between freshwater and seawater water sources, ensuring uninterrupted fire-fighting operations.

[0072] In one embodiment, such as Figure 1As shown, a fire pump 610 is installed on the main fire water supply pipeline 600 to provide power for the fire water supply. By installing the fire pump 610 on the main fire water supply pipeline 600, the fire water supply system has the power guarantee for active pressurized water supply, providing stable pressure and flow for fire water, ensuring that both fresh and seawater can be delivered to all fire points on board. Furthermore, even if the ship tilts or some pipelines are damaged, the fire pump 610 can still maintain the water supply pressure, ensuring the coverage of firefighting water and improving the reliability of the fire protection system in the nuclear safety area.

[0073] In summary, the fire water tank replenishment method for nuclear power plants in this application only requires the addition of a water replenishment pipeline 200 and an electric valve 210 to the important plant water system 300. It does not increase the fire water replenishment equipment, does not increase the burden on the existing fire protection system, and does not affect the normal operation of the important plant water system 300. It achieves continuous fire water supply with minimal modifications. By reducing the initial water storage volume of the fire fresh water tank 100, the hull load space is freed up for the placement of key nuclear power equipment, taking into account both the safety and economy of the ship platform.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for replenishing water in the fire-fighting water tanks of a nuclear power plant ship, characterized in that, include: At least one fire-fighting freshwater tank (100) is provided on the nuclear power ship, and the fire-fighting freshwater tank (100) stores a preset capacity of freshwater; The fire-fighting freshwater tank (100) is connected to the drain end of the important plant water system (300) on the nuclear power ship via a water supply pipeline (200); The fresh water in the fire-fighting fresh water tank (100) is transported to the area where fire needs to be extinguished, and when the water level in the fire-fighting fresh water tank (100) drops to a preset level, the seawater discharged from the important plant water system (300) flows into the fire-fighting fresh water tank (100) through the water replenishment pipeline (200).

2. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 1, characterized in that, Also includes: An electric valve (210) is installed on the water supply pipeline (200), and the electric valve (210) is connected to the controller (400) via signal. When the water level of the fire-fighting freshwater tank (100) drops to the preset level, the electric valve (210) is opened by the controller (400).

3. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 2, characterized in that, Also includes: The level gauge (500) is installed inside the fire-fighting freshwater tank (100), and the level gauge (500) is connected to the controller (400) via signal connection. The controller (400) compares the preset liquid level with the real-time liquid level detected by the level gauge (500); If the real-time liquid level is lower than the preset liquid level, the controller (400) controls the electric valve (210) to open, so that the seawater of the important plant water system (300) is supplied to the fire-fighting freshwater tank (100) through the water supply pipeline (200); If the real-time liquid level is greater than or equal to the preset liquid level, the controller (400) controls the electric valve (210) to close and stop water replenishment.

4. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 1, characterized in that, Configure the effective volume of the fire-fighting freshwater tank (100) so that the freshwater in the fire-fighting freshwater tank (100) can at least meet the fire-fighting freshwater volume required for a single fire extinguishing operation to last for 1 hour.

5. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 1, characterized in that, A fire-fighting freshwater tank (100) is installed on the port side and the starboard side of the nuclear power ship, and both fire-fighting freshwater tanks (100) are connected to the drain end of the important plant water system (300) through a water supply pipeline (200).

6. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 5, characterized in that, Configure the total effective volume of the two fire-fighting freshwater tanks (100) so that the freshwater in the two fire-fighting water tanks can at least meet the amount of fire-fighting freshwater required for a single fire extinguishing operation lasting 1 hour.

7. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 1, characterized in that, The important plant water system (300) includes a heat exchanger (340), and one end of the water supply pipeline (200) is connected to the liquid outlet end of the heat exchanger (340).

8. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 7, characterized in that, The important plant water system (300) also includes a subsea gate (310), a filter (320), a seawater intake pump (330) and a heat exchanger (340) connected in sequence by pipelines. Seawater is configured to flow into the water supply pipeline (200) after passing through the subsea gate (310), the filter (320), the seawater intake pump (330) and the heat exchanger (340) in sequence.

9. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 1, characterized in that, The fire-fighting freshwater tank (100) is connected to the fire-fighting water supply main pipeline (600) so as to provide fire-fighting water to the fire-fighting water supply main pipeline (600) through the fire-fighting freshwater tank (100).

10. The method for replenishing the fire-fighting water tanks of a nuclear power plant ship according to claim 9, characterized in that, A fire pump (610) is installed on the main fire water supply pipeline (600) to provide power for fire water supply.

Images