KR102657102B1 - Open-type reactor coolant collection and cooling device for nuclear power plants equipped with an in-containment refueling water storage tank and its relevant method - Google Patents

Abstract

The present invention relates to an open reactor coolant collection and cooling device for a nuclear power plant equipped with a reload water storage tank within a nuclear reactor building and a method therefor. In particular, the reactor coolant collection and cooling device includes a nuclear fuel reloading water storage tank provided inside the reactor building; a collection tank disposed inside the reload water storage tank to collect water leaked, drained, or released from equipment provided inside the reactor building; And a collection pipe connecting the collection tank and the device.

Description

Open-type reactor coolant collection and cooling device for nuclear power plants equipped with an in-containment refueling water storage tank and its relevant method}

The present invention relates to an open reactor coolant collection and cooling device for a nuclear power plant equipped with a reload water storage tank within a nuclear reactor building and a method for the same. In particular, the present invention relates to an open reactor coolant collection container installed inside the reload water storage tank, so that the This relates to a reactor coolant collection and cooling device with improved reactor coolant leak collection and leak rate monitoring functions and improved operating convenience by improving the design of collecting and draining reactor coolant grade water discharged from equipment through leaks, drainage, discharge, etc.

The present invention relates to a system for collecting and draining reactor coolant grade water generated by leakage, drainage, discharge, etc. from equipment inside the reactor building in a pressurized light water reactor type nuclear power plant in which a nuclear fuel reloading water storage tank is placed inside the reactor building.

Figure 1 shows a conventional reactor coolant collection and drainage system inside the reactor building in APR1400, a pressurized light water reactor type nuclear power plant model in which a nuclear fuel reload water storage tank is installed inside the reactor building. Reactor coolant grade water generated by leaks, drainage, discharge, etc. from equipment inside the reactor building is collected in the reactor coolant collection tank (102) installed outside the reloading water storage tank (IRWST, 101) in the reactor building. In order to prevent contamination of the atmosphere of the reactor building, nitrogen is supplied to the upper part of the reactor coolant collection tank (102), which is designed as a sealed pressurized tank, to maintain within a certain pressure range, and when the pressure rises above the normal range, the reactor coolant collection tank The upper gas of (102) is exhausted to the gas waste system to reduce pressure. When a certain amount of reactor coolant is collected in the reactor coolant collection tank (102), the drain pump (104) is activated and transferred to the storage tank (106) after passing through the desalting and degassing device (105).

When high-temperature reactor coolant is discharged into the reactor coolant collection tank (102) and the temperature of the reactor coolant collection tank (102) rises excessively, the reactor supplementary water pump (107) is activated to protect the resin of the rear desalinator. By supplying reactor supplemental water, it is mixed with the water collected in the reactor coolant collection tank (102), lowered to a certain temperature, and then treated. Additionally, when the reactor coolant collection tank 102 needs to be refilled, the reactor replenishment water pump 107 is activated to supply reactor replenishment water. When the operating pressure of the reactor coolant collection tank 102 reaches the opening set value of the pressure release valve 108, the pressure release valve 108 is opened and the discharged water is discharged into the reactor building collection tank 109.

In order to collect leaks and emissions from the safety release valve 111 (or safety valve) installed on the top of the pressurizer 103, the discharge passage 110 is connected to the reactor coolant collection tank 102 and the reload water storage tank ( 101). The reactor coolant vapor leaking from this valve during normal operation is condensed within the discharge passage 110 and collected by gravity in the reactor coolant collection tank 102, and the non-condensable gas flows into the reload water storage tank 101. When the pressurizer safety release valve (or safety valve) 111 is opened, high-temperature steam is discharged into the water of the reload water storage tank 101 through a sparger and is rapidly cooled and condensed. Other reactor coolant leaks from devices inside the reactor building other than the pressurizer safety release valve 111 (or safety valve) are also collected in the reactor coolant collection tank 102, and the increase in water level per unit time is measured to determine the amount of leakage from the reactor coolant system. It is used to monitor the leakage rate of reactor coolant.

The reloading water storage tank 101, a large tank, stores a large amount of boric acid water for nuclear fuel replacement, safe injection, reactor building watering, and cooling of emissions from the safety decompression exhaust system. During normal operation, excluding nuclear fuel replacement, safety injection due to an accident, reactor building watering, safety decompression exhaust system emission cooling operation, etc., the temperature and water level of the reload water storage tank (101) are maintained within the allowable range of the operating technology guidelines, and the pressure The pressure fluctuation range is not large based on the atmospheric pressure of the reactor building. The reloading water storage tank (101) is equipped with an overpressure protection facility and is designed so that the contaminated air inside is purified and discharged, and the water can be purified when necessary.

Since the air supply passage 112 and the exhaust passage 113 are installed in the upper part of the reload water storage tank 101, the pressure of the reload water storage tank 101 is maintained at the atmospheric pressure of the reactor building during normal operation. The air supply passage 112 is used to supply air into the tank to prevent vacuum in the reload water storage tank 101, and the exhaust passage 113 is used to supply air into the tank to prevent overpressure of the reload water storage tank 101. It is used to discharge. In addition, in order to remove hydrogen in the reloading water storage tank 101, an automatic hydrogen removal facility is installed above the normal operating water level of the reloading water storage tank 101.

However, the above-described conventional technical configuration has the following problems.

If the pressure of the reactor coolant collection tank 102 increases excessively, the flow of reactor coolant leakage water flowing into the reactor coolant collection tank 102 due to gravity due to the water head difference may be disrupted, thereby lowering the leakage water collection efficiency. That is, in Figure 1, under normal reactor coolant collection tank 102 pressure conditions, leakage vapor from the pressurizer safety release valve 111 is condensed inside the discharge pipe 110 and collected into the reactor coolant collection tank 102, but when the reactor coolant is collected If the operating pressure of the tank 102 increases excessively, the leakage vapor condensate from the pressurizer safety (release) valve 111 will not be smoothly collected in the reactor coolant collection tank 102 and may flow into the reload water storage tank 101. You can. In addition, leaked water that flows to the reactor coolant collection tank 102 by gravity at atmospheric pressure may not be collected in the reactor coolant collection tank 102 and may leak into an abnormal flow path. The reload water storage tank 101, which is a large tank, has a larger water surface area compared to the reactor coolant collection tank 102, which is a small tank, so the water level change rate is small, so it is inappropriate for monitoring the leakage rate.

When high-temperature reactor coolant flows into the reactor coolant collection tank (102) and the temperature inside the reactor coolant collection tank (102) rises above the allowable range, the collected water from the reactor coolant collection tank (102) is mixed with low-temperature reactor supplemental water. The cold water mixed cooling method increases the amount of water to be treated, increasing the burden on purification and regeneration facilities and treatment time.

In addition, in the prior art, when drainage is delayed because the drainage treatment conditions for the water in the reactor coolant collection tank 102 are not satisfied, if the collected water continues to flow in, the pressure in the reactor coolant collection tank 102 rises, so the operator decompresses the gas by exhausting it. Must be able to drive. At this time, if the pressure in the reactor coolant collection tank (102) rises above the normal range, the gravity collection efficiency of reactor coolant leakage decreases, and if the water level rises above the nozzle tap of the upper water level gauge (114), it may interfere with monitoring the leak rate of reactor coolant. there is. When the pressure in the reactor coolant collection tank 102 reaches the pressure relief valve 108 opening set value, the discharged water is discharged into the reactor building sump and then discarded, so the amount of reactor coolant waste may increase.

The present invention was developed to solve the above-described needs. By installing an open reactor coolant collection container inside the reload water storage tank, the reactor coolant grade discharged by leakage, drainage, discharge, etc. from equipment inside the reactor building is collected. By improving the design of collecting and draining water, we provide an open reactor coolant collection and cooling device for a nuclear power plant with a reactor coolant leak collection and leak rate monitoring function and a reload water storage tank within the reactor building with improved operating convenience, and a method for the same. It is for that purpose.

According to one aspect of the present invention, an open reactor coolant collection and cooling device for a nuclear power plant having a reloading water storage tank within a nuclear reactor building includes: a nuclear fuel reloading water storage tank provided inside the reactor building; a collection tank disposed inside the reload water storage tank to collect water leaked, drained, or released from equipment provided inside the reactor building; And a collection pipe connecting the collection tank and the device.

In addition, the collection tank has an open top, and it is preferable that at least a portion of the top is exposed above the water surface of the reload water storage tank.

Additionally, the collection tank is preferably coupled to the side of the reload water storage tank.

In addition, the water level of the collection tank is maintained lower than the water level of the reloading water storage tank, and a water filling valve is provided to supply water from the reloading water storage tank to the collecting tank. When filling the collection tank, the water filling valve is provided. It is preferable that the water from the reload water storage tank is provided to the collection tank.

Additionally, a heat exchanger provided inside the collection tank; A circulating water pump supplies and circulates the water stored in the reloading water storage tank to the heat exchanger, wherein the water in the reloading water storage tank circulates by the circulating water pump and receives heat inside the collection tank to transfer the water to the heat exchanger. It is desirable to cool the water in the collection tank.

Additionally, a heat exchanger provided inside the reload water storage tank; It includes a circulating water pump that supplies the water in the collection tank to the heat exchanger and circulates it, and the water in the collection tank is preferably cooled by transferring heat to the water in the reload water storage tank while circulating by the circulating water pump. do.

Additionally, it is preferable that the water collected in the collection tank is allowed to overflow into the reload water storage tank in cases where normal drainage is not possible.

In addition, the reloading water storage tank includes an air supply flow path that supplies air to the inside to prevent a vacuum inside the reloading water storage tank, and an air supply channel that discharges the internal air to the outside to prevent overpressure of the reloading water storage tank. It is desirable to provide an exhaust flow path.

In addition, the reloading water storage tank is preferably provided with a water tank removal facility to remove hydrogen therein.

In addition, it is preferable that a heat transfer member is provided on the outer wall of the collection tank to cool the water collected in the collection tank.

In addition, the heat transfer member is preferably a cooling fin that extends in the vertical direction of the outer wall of the collection tank and is installed to be spaced apart from each other, or a heat pipe that is installed through the wall of the collection tank.

Meanwhile, the method of collecting and cooling the open reactor coolant of a nuclear power plant with a reloading water storage tank in the reactor building according to another aspect of the present invention is a method of collecting and cooling coolant of a coolant grade that leaks, drains, or is released from equipment provided inside the reactor building. A collection tank for collecting water is placed inside a nuclear fuel reload water storage tank provided inside the reactor building, and the upper part of the collection tank is opened to collect the water while maintaining the same pressure as the pressure inside the reload water storage tank. It is characterized by collection.

Here, the outer wall of the collection tank is installed higher than the water surface of the reload water storage tank, and when the water level of the collection tank is lower than the water level of the reload water storage tank and the collection tank needs to be filled, the collection tank It is preferable that the provided water supply valve is opened to receive water from the reload water storage tank by gravity.

Here, it is preferable that the upper part of the collection tank is open so that water collected in the collection tank is allowed to overflow into the reload water storage tank.

Here, when cooling of the water collected in the collection tank is required, it is preferable to cool the water in the collection tank by using the water in the reload water storage tank as a heat immersion source.

The open reactor coolant collection and cooling device for a nuclear power plant equipped with a reload water storage tank in a nuclear reactor building according to the present invention and the method for the same are provided by installing an open reactor coolant collection container inside the reload water storage tank, thereby removing the device from the equipment inside the reactor building. By improving the design of collecting and draining reactor coolant grade water discharged by leaks, drainage, discharge, etc., it provides the effect of improving reactor coolant leak collection, leak rate monitoring functions, and operational convenience.

1 is a diagram showing a conventional nuclear reactor coolant collection system;
Figure 2 is a diagram showing a nuclear reactor collection and cooling device according to an embodiment of the present invention;
Figure 3 is a diagram showing a state in which a heat transfer member is coupled to a collection tank;
Figures 4 and 5 conceptually illustrate cooling the water in the collection tank using a heat exchanger and a circulating water pump.

Hereinafter, various embodiments of the present invention are described in conjunction with the accompanying drawings. Various embodiments of the present invention can be modified and have various embodiments, and specific embodiments are illustrated in the drawings and related detailed descriptions are provided. However, this is not intended to limit the various embodiments of the present invention to specific embodiments, and should be understood to include all changes and/or equivalents or substitutes included in the spirit and technical scope of the various embodiments of the present invention. In connection with the description of the drawings, similar reference numbers have been used for similar components.

Expressions such as “includes” or “may include” that may be used in various embodiments of the present invention refer to the existence of the corresponding function, operation, or component that has been disclosed, and one or more additional functions, operations, or components. There are no restrictions on components, etc. In addition, in various embodiments of the present invention, terms such as "comprise" or "have" are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. It should be understood that this does not exclude in advance the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

When a component is referred to as being "connected" to another component, the component may be directly connected to the other component, but there is no new component between the component and the other component. It should be understood that may exist. On the other hand, when a component is referred to as being “directly connected” to another component, it should be understood that no new components exist between the component and the other component.

Terms used in various embodiments of the present invention are merely used to describe a specific embodiment and are not intended to limit the various embodiments of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which various embodiments of the present invention pertain.

Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related technology, and unless clearly defined in various embodiments of the present invention, they should not be idealized or excessively formal. It is not interpreted as meaning.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. Figure 2 is a diagram showing a nuclear reactor collection and cooling device according to an embodiment of the present invention, and Figure 3 is a diagram showing a state in which a heat transfer member is coupled to a collection tank. Figures 4 and 5 conceptually illustrate cooling the water in the collection tank using a heat exchanger and a circulating water pump.

The present invention is a device for collecting and cooling nuclear reactor coolant grade water leaked, drained, or released from devices inside the nuclear reactor building by installing an open collection tank (20) inside the large reloading water storage tank (10) in the nuclear reactor building; It's about method.

According to one embodiment of the present invention, a small collection tank (20) is placed inside the large reloading water storage tank (10) to increase the collection efficiency of leakage water by gravity and the leakage rate by measuring water level changes. Monitoring accuracy can be improved. According to one embodiment of the present invention, in order to collect leaking condensate from the safety release valve 301 of the pressurizer 300 disposed in the nuclear reactor building or to collect leakage water from other devices, a storage tank 10 is installed inside the reload water storage tank 10. An open collection tank (20) is placed.

During normal operation of the nuclear power plant, the pressure of the reloading water storage tank 10 is maintained at atmospheric pressure, and the collection tank 20 is installed in an open manner inside the reloading water storage tank 10 to store the reloading water storage tank 10. ) is maintained the same as the pressure, so the range of pressure fluctuation is not large, so the back pressure for gravity flow such as leakage water from the safety release valve 301 of the pressurizer 300 and leakage water from other devices is lowered, thereby lowering the pressure in the collection tank. The flow of the leakage water, etc. to (20) becomes smooth.

Referring to Figure 2, the open reactor coolant collection and cooling device of a nuclear power plant equipped with a reloading water storage tank 10 in the reactor building according to an embodiment of the present embodiment includes a reloading water storage tank 10 and a collection tank 20. ), including the collection pipe (30).

The reloading water storage tank 10 is provided inside the nuclear reactor building and is installed as a large tank that stores a large amount of boric acid water for nuclear fuel replacement, safe injection, reactor building watering, safety decompression exhaust system discharge cooling, etc.

During normal operation, excluding nuclear fuel replacement, safe injection due to an accident, reactor building spraying, safety decompression exhaust system emission cooling operation, etc., the temperature and water level of the reload water storage tank (10) are maintained within the allowable range of the operating technology guide, and the pressure The pressure fluctuation range is maintained to be small based on the atmospheric pressure of the reactor building. The reloading water storage tank 10 is equipped with an overpressure protection device, and is designed so that the contaminated air inside is purified and discharged, and the water can be purified when necessary.

An air supply passage 70 and an exhaust passage 80 are installed at the top of the reload water storage tank 10. The air supply passage 70 and the exhaust passage 80 maintain the pressure of the reload water storage tank 10 at atmospheric pressure during normal operation. The air supply passage 70 supplies air to the reload water storage tank 10 to prevent an internal vacuum, and the exhaust passage 80 discharges air in the reload water storage tank 10 to prevent overpressure. It is prepared for

According to this embodiment, the reloading water storage tank 10 is provided with a hydrogen removal facility 90 to remove hydrogen therein. The water tank removal facility is installed above the normal operating water level of the reload water storage tank (10).

The collection tank 20 is disposed inside the reload water storage tank 10 to collect water (hereinafter referred to as collection water) that leaks, drains, or is released from equipment provided inside the nuclear reactor building. The collection tank 20 has an open top. As shown in Figure 2, the upper side of the collection tank 20 is open without a separate cover, and the pressure of the collection tank 20 is maintained the same as the pressure of the reloader storage tank 10. . When a certain amount of collected water is collected in the collection tank (20), the drainage pump (200) is activated and transferred to the storage tank (202) after passing through the desalination and deaeration facility (201). If normal drainage is not possible, reload water is stored. It overflows into the tank (10).

According to this embodiment, the internal pressure of the reload water storage tank 10 is maintained at the same level as atmospheric pressure, and as a result, the internal pressure of the collection tank 20 is also maintained at the same level as atmospheric pressure, thereby reducing the overpressure of the collection tank 20. This is prevented.

The collection tank 20 is disposed with at least a portion of its upper part exposed above the water surface of the reload water storage tank 10. As shown in Figure 2, since the wall of the collection tank 20 is placed higher than the water surface of the reload water storage tank 10, the water level measurement range of the collected water can be expanded. Additionally, since the upper part of the collection tank 20 is open, water collected in the collection tank 20 is allowed to overflow into the reload water storage tank 10. Therefore, compared to the conventional case in which excessive collected water was discharged into the sump 109 and the treatment volume of the collected water collected in the sump 109 was increased, no reactor coolant waste is generated.

According to this embodiment, the collection tank 20 is coupled to the side of the reloader storage tank 10. As shown in Figure 3, the collection tank 20 has a circular cross-section, but its shape is not limited to this. In FIG. 3, for convenience, the rear-end configuration including the drainage pump 200 of FIG. 2 is omitted.

The collection tank 20 may utilize one side wall of the reload water storage tank 10 as a part of the tank. For example, the collection tank 20 may have an overall square cross section, and the inner wall of the reload water storage tank 10 may be used as one side wall. In other words, a “ㄷ” shaped frame may be formed by combining the inner wall of the reload water storage tank 10.

According to an embodiment of the present invention, the water level of the collection tank 20 is maintained lower than the water level of the reload water storage tank 10. In addition, in order to replenish water in the collection tank 20, a supplementary valve 40 is provided that supplies water from the reload water storage tank 10 to the collection tank 20. In a state where the water level of the collection tank 20 is lower than the water level of the reload water storage tank 10, when the collection tank 20 needs to be filled, the fill valve 40 is opened, and the reload water storage tank ( The water in 10) moves naturally by gravity and is provided to the collection tank (20).

According to an embodiment of the present invention, when high-temperature collection water flows into the collection tank 20, a heat exchanger 50 and a circulating water pump 60 or a heat transfer device are used to cool the internal temperature of the collection tank 20. A member 21 is provided. In FIGS. 4 and 5, for convenience, the rear-end configuration including the drainage pump 200 of FIG. 2 is omitted.

According to one embodiment of the present invention, the heat exchanger 50 is provided inside the collection tank 20, and the circulating water pump 60 circulates the water stored in the reloading water storage tank 10. It is provided to supply and circulate the heat exchanger (50). As shown in FIG. 4, the water in the reloading water storage tank 10 circulates by the circulating water pump 60 and receives heat inside the collection tank 20 to be stored in the water in the collection tank 20. Cool down.

A temperature gauge is provided inside the collection tank 20 to detect temperature, and when the temperature gauge generates a first signal as the temperature of the water in the collection tank 20 rises above a predetermined set temperature, the circulation The water pump 60 operates automatically to circulate the water in the reload water storage tank 10 in a forced circulation manner. The water in the reloading water storage tank 10 is used as coolant. Meanwhile, when the temperature of the water inside the collection tank 20 drops to a predetermined temperature, the temperature gauge generates a second signal, and the circulating water pump 60 can automatically stop.

According to another embodiment of the present invention, the heat exchanger 50 is provided inside the reloading water storage tank 10, and the circulating water pump 60 transfers water from the collection tank 20 to the heat exchanger. It is supplied to (50) and circulated. As shown in Figure 5, the water in the collection tank 20 is circulated by the circulating water pump 60 and passes through the heat exchanger 50 provided in the reload water storage tank 10, and the reload water It is cooled by transferring heat to the water in the storage tank (10).

Like the embodiment of Figure 4, according to this embodiment, the circulating water pump 60 operates automatically in response to the first signal, and circulates the water inside the collection tank 20 in a forced circulation manner to collect the water. Cool the water. At this time, the water in the reload water storage tank 10 is used as coolant. Meanwhile, when the second signal is generated by the temperature measuring device, the circulating water pump 60 can automatically stop.

The heat transfer member 21 is installed on the outer wall of the collection tank 20 and is provided to cool the water in the collection tank 20. As shown in Figure 3, the heat transfer members 21 extend in the vertical direction from the outer wall of the collection tank 20 and are installed to be spaced apart from each other. The heat transfer member 21 may be a cooling fin or a heat pipe.

The cooling fins may extend and protrude outward from the outer wall of the collection tank 20, and a plurality of cooling fins may be arranged to be spaced apart in the vertical direction at regular intervals for one row located in the vertical direction.

The heat pipe may penetrate the wall of the collection tank 20 and be attached at predetermined intervals. The heat pipe may have a generally known configuration. By the cooling fin or the heat pipe, heat inside the collection tank 20 may be transferred to the water stored in the reload water storage tank 10.

Meanwhile, according to another aspect of the present invention, a method for collecting and cooling open reactor coolant of a nuclear power plant provided with a reloading water storage tank (10) within the reactor building is provided.

The method for collecting and cooling the open reactor coolant of a nuclear power plant with a reloading water storage tank 10 in the reactor building according to this embodiment is to collect coolant grade water that leaks, drains, or is released from equipment provided inside the reactor building. A collection tank (20) for collecting nuclear fuel is placed inside a nuclear fuel reloader storage tank (10) provided inside the nuclear reactor building, and the upper part of the collection tank (20) is opened to determine the pressure inside the reloader storage tank (10). Collect the water while maintaining the same pressure. The internal pressure of the reloading water storage tank 10 is maintained at the same level as atmospheric pressure through the air supply passage 70 and the exhaust passage 80, and the upper part of the collection tank 20 is maintained in an open state. The collection water can be collected under the same condition as the internal pressure of the reloading water storage tank (10).

In addition, the outer wall of the collection tank 20 is installed higher than the water surface of the reload water storage tank 10, and the water level of the collection tank 20 is lower than the water level of the reload water storage tank 10. When the collection tank 20 needs to be filled with water, the water filling valve 40 provided in the collection tank 20 is opened to receive water from the reloading water storage tank 10 by gravity. Since the top of the outer wall is higher than the water level of the reload water storage tank 10, the water level measurement range of the collected water can be expanded, and the collection tank 20 is smaller than the reload water storage tank 10, It is possible to sensitively measure dozens of water level changes. In addition, because the water from the reloading water storage tank 10 can flow into the collection tank 20 without being provided with separate power by the water filling valve 40, the structure is simplified by eliminating the conventional water filling equipment. , the risk of device malfunction can be reduced.

In addition, the upper part of the collection tank 20 is open, allowing the water collected in the collection tank 20 to overflow into the reload water storage tank 10, which allows excess collected water to be transferred to the conventional water collection tank 109. Coolant waste can be reduced by omitting the discharge and disposal process.

According to an embodiment of the present invention, when cooling of the water collected in the collection tank 20 is required, the water in the reloading water storage tank 10 is used as a heat source to cool the water in the collection tank 20. Specifically, the water collected in the collection tank 20 can be cooled by the heat exchanger 50 and the circulating water pump 60.

As described above, the water in the collection tank 20 can be cooled by arranging the heat exchanger 50 and the circulating water pump 60 as shown in FIGS. 4 and 5. That is, the method for collecting and cooling the nuclear reactor coolant according to this embodiment can cool the water in the collection tank 20 by the arrangement structure shown in FIG. 4 or the arrangement structure shown in FIG. 5. At this time, the circulating water pump ( The operation of 60) can be controlled by the first signal and the second signal generated by the temperature measuring device as described above.

Additionally, the method for collecting and cooling the reactor coolant according to this embodiment can use the heat transfer member 21 to cool the water in the collection tank 20. The configuration of the heat transfer member 21 can be substantially adopted as the configuration of the nuclear reactor coolant collection and cooling device described above. That is, the heat transfer member 21 may be a cooling fin or a heat pipe, and since this has already been described above, repeated description will be omitted.

Hereinafter, the operation and effect of the reactor coolant collection and cooling device and method therefor according to the above configuration will be described.

According to embodiments of the present invention, a reactor coolant collection and cooling device and method therefor are used to collect reactor coolant grade water that leaks from devices inside the reactor building, such as the pressurizer 300, in a nuclear power plant equipped with a reload water storage tank 10. A collection tank 20 that collects water (including leakage water, drainage, discharge water, etc.) is installed inside the reload water storage tank 10 to maintain back pressure when the water is collected into the collection tank 20. By lowering the water collection efficiency, the collection tank 20 is formed in an open type, thereby reducing costs by replacing the conventional pressure collection container with a non-pressure container.

The collection tank 20 is formed in an open form, and the upper connection part of the water level gauge 22 of the collection tank 20 is installed in the space above the water surface of the reloading water storage tank 10, so that the water level is increased as the water level measurement range is expanded. The range of monitoring the leakage rate of reactor coolant by changing measured values is expanded.

In addition, when water is needed to replenish the water in the collection tank (20), the water in the recharge water storage tank (10) is opened by opening the water supply valve (40) to supply water from the reloading water storage tank (10) by gravity, thereby replacing the water supply facility using a conventional supplementary water pump. can be eliminated and the appendix operation procedure can be simplified.

As collected water such as discharged water and leaked water flows into the open collection tank 20, the internal pressure of the reloaded water storage tank 10 increases and hydrogen and polluted gases accumulate, and the exhaust system provided in the reloaded water storage tank 10 And since the gas is purified and discharged by the gas purification facility, and the internal pressure of the reload water storage tank 10 is reduced, the nitrogen supply facility, overpressure protection device, and gas discharge facility that were previously installed in the collection container can be removed. Additionally, if the hydrogen concentration in the reloading water storage tank 10 increases excessively, the hydrogen is automatically removed by the hydrogen removal facility 90 above the water surface of the reloading water storage tank 10.

In addition, when the water temperature in the collection tank 20 rises due to the inflow of high-temperature collection water, heat transfer members such as cooling fins attached to the outer wall of the collection tank 20 or heat pipes installed through the wall of the collection tank 20 ( 21), the heat inside the collection tank 20 is transferred to the water stored in the reloading water storage tank 10 and is naturally cooled, thereby reducing the burden on the operator for cooling operation compared to the conventional cold water mixing method. Throughput can be reduced in desalting, degassing, and regeneration processes.

In addition, when the temperature of the collection tank 20 rises above a predetermined temperature and becomes a high temperature state, the circulating water pump 60 is automatically operated by the first signal of the temperature measuring instrument, and the collection tank 20 or The heat inside the collection tank 20 can be transferred to the water in the reloading water storage tank 10 to cool it by using a heat exchanger 50 selectively provided inside the reloading water storage tank 10. At this time, the water in the collection tank 20 or the water in the reload water storage tank 10 is circulated in a forced circulation manner by the circulating water pump 60, and the water stored in the reload water storage tank 10 is used as coolant. It is cooled. This can prevent an increase in throughput due to the conventional cold water mixing method and reduce the burden on operators.

In the prior art, if collection water continues to flow in while the drainage conditions of the reactor coolant collection tank 102 are not satisfied, the pressure of the reactor coolant collection tank 102 increases, so the efficiency of collecting leaks of the reactor coolant and monitoring the leak rate decreases. , Accordingly, the operator must perform decompression operation by gas exhaust. On the other hand, the collection tank 20 employed in the present invention is discharged through the reload water storage tank 10 even if the reactor coolant continues to flow in when the drainage conditions are not satisfied, so the operator needs to perform a gas exhaust operation for depressurization. There is no In addition, since the collection tank 20 is open, the pressure rise is small and the water level can be measured up to the top of the container, so the collection efficiency of leakage water of the reactor coolant can be improved compared to the prior art and the leak rate monitoring time can be extended.

Additionally, in the prior art, when the drain operation of the reactor coolant collection tank 102 is delayed for a long time, overpressure occurs in the reactor coolant collection tank 102 and the discharge valve 108 is opened, allowing water to flow into the reactor building sump 109. However, in the present invention, water overflows into the reload water storage tank 10, so reactor coolant waste is not generated. As described above, the present invention provides the effect of improving the function, operating convenience, and economic efficiency of the nuclear reactor coolant collection and cooling system.

Above, the present invention has been described in detail with respect to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made without departing from the scope of the present invention.

10, 101... reload storage tank 20, 102... collection tank
21... heat transfer member 22, 114... water level gauge
30, 110... Collection pipe 40... Supplement valve
50... heat exchanger 60... circulating water pump
70, 112... Supply air flow path 80, 113... Exhaust flow path
90... Hydrogen removal equipment 103, 300... Pressurizer
104, 200... Drain pump 105, 201... Desalination and degassing device
106, 202... Storage tank 107... Reactor make-up water pump
108... Pressure release valve 109... Sump tank
111, 301... Pressurizer safety release valve

Claims (13)

A nuclear fuel reloading water storage tank provided inside the reactor building and storing boric acid water used for nuclear fuel replacement, reactor building watering, and cooling of safety decompression exhaust system emissions;
a collection tank disposed inside the reload water storage tank to collect water leaked, drained, or released from equipment provided inside the reactor building;
A collection pipe connecting the collection tank and the device; and
During normal operation of the nuclear power plant, an air supply flow path for supplying air from the upper part of the reloading water storage tank to the reloading water storage tank to prevent an internal vacuum so as to maintain the pressure of the reloading water storage tank at atmospheric pressure, and the reloading water storage tank It includes an exhaust passage that discharges air in the tank to prevent overpressure,
The collection tank and the reload water storage tank are separated from each other, so that the water level of the collection tank and the water level of the reload water storage tank vary independently from each other, and the level of the collected water is measured in the collection tank,
The collection tank has an open top to maintain the same internal pressure as the reload water storage tank, and its outer wall is installed higher than the water surface of the reload water storage tank,
The collection tank is coupled to the side of the reload storage tank,
The water level of the collection tank is maintained lower than the water level of the reload water storage tank,
A fill valve is provided to supply water from the reload water storage tank to the collection tank, and when the collection tank needs to be filled, the fill valve is opened to supply water from the reload water storage tank to the collection tank,
It includes a heat exchanger provided inside the collection tank or the reload water storage tank,
1) When the heat exchanger is provided inside the collection tank, a circulating water pump supplies the water stored in the reloading water storage tank to the heat exchanger and circulates it, including; the water in the reloading water storage tank is the circulating water. Cools the water in the collection tank by receiving heat inside the collection tank while circulating by the pump,
2) When the heat exchanger is provided inside the reloading water storage tank, a circulation pump supplies the water in the collection tank to the heat exchanger and circulates it, and the water in the collection tank is circulated by the circulating water pump. An open reactor coolant collection and cooling device for a nuclear power plant with a reloading water storage tank in a nuclear reactor building, characterized in that it is cooled by transferring heat to water in the reloading water storage tank while doing so. delete delete delete delete delete According to paragraph 1,
An open reactor coolant collection and cooling device for a nuclear power plant with a reload water storage tank in a nuclear reactor building, wherein the water collected in the collection tank is allowed to overflow into the reload water storage tank when normal drainage is impossible. According to paragraph 1,
An open reactor coolant collection and cooling device for a nuclear power plant with a reload water storage tank in a nuclear reactor building, characterized in that a heat transfer member is provided on the outer wall of the collection tank to cool the water collected in the collection tank. According to clause 8,
The heat transfer member is a cooling fin installed to be spaced apart from each other while extending in the vertical direction of the outer wall of the collection tank, or a heat pipe installed through the wall of the collection tank. An open reactor coolant collection and cooling device in a nuclear power plant.

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