JP2023083078A - Leakage monitoring device for auxiliary cooling water system - Google Patents

Abstract

To provide a leakage monitoring device that can remove the influence of a change in temperature of cooling water and can detect minute leakage even when the volume of the cooling water changes.SOLUTION: A leakage monitoring device used for an auxiliary cooling water system has: a first temperature measurement facility that is provided on piping on an outlet side of a heat exchanger; a second temperature measurement facility that is provided on piping on an inlet side of the heat exchanger; a storage unit that stores in advance the correspondence relationship between the temperature of cooling water and the amount of change in the volume of the cooling water; an acquisition unit that acquires information on the temperature measured by the first and second temperature measurement facilities and information on the water level measured by a measurement unit; a correction unit that, based on the correspondence relationship stored in the storage unit and the information on the temperature acquired by the acquisition unit, corrects the water level of a surge tank measured by the measurement unit to calculate a corrected water level obtained by removing the influence of the volume change; and a determination unit that determines that the cooling water has leaked based on the corrected water level calculated by the correction unit.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a leakage monitoring device provided in an accessory cooling water system, which is a closed circuit, for early detection of leakage of fluid such as cooling water and lubricating oil of cooled equipment.

The auxiliary cooling water system used in thermal and nuclear power generation supplies the cooling water (secondary coolant) cooled by the heat exchanger of the auxiliary cooling water system to the auxiliary cooling water system, and removes heat from the auxiliary cooling water system. Is going.
In the auxiliary equipment side system, the tertiary coolant (oil, water, gas, etc.) cooled by the auxiliary equipment cooler removes heat from the components of the auxiliary equipment side system.
The heat exchanger of the auxiliary equipment cooling water system is cooled by a primary coolant such as seawater, river water, cooling tower cooling water, etc., and releases the heat removed from the components of the auxiliary equipment side system to the outside of the system.

The accessory cooling water system forms a closed circuit composed of the accessory cooling water system's heat exchanger, pump, surge tank, pipes, valves, etc. Cooling water circulates in this closed circuit.
When the cooling water decreases due to the occurrence of leakage in the auxiliary equipment cooler or the heat exchanger of the auxiliary equipment cooling water system, the water level in the surge tank decreases and make-up water is supplied.

Therefore, the presence or absence of leakage can be detected from the change in the water level in the surge tank, the amount of makeup water, and the frequency of operation of the makeup water valve.
However, there are problems such as that the water level in the surge tank changes due to volume expansion and contraction due to changes in cooling water temperature, and that it takes a long time to detect minute leaks due to the amount of makeup water and the frequency of operation of the makeup water valve. be.

Patent Literature 1 discloses a leakage detection device that detects leakage at an early stage from an increase in the water level decrease speed of a leakage detection pipe that connects a surge tank and a downcomer pipe when cooling water flows out due to a break in a pipe. .

JP-A-1-263530

The technique of Patent Document 1 does not take into consideration the expansion and contraction of the volume of the cooling water due to the temperature change of the cooling water. there were.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a leak monitoring device that eliminates the effects of temperature changes in cooling water and that can detect minute leaks even when the volume of cooling water changes.

In addition, the above and other objects of the present invention and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

A leakage monitoring device for an accessory cooling water system according to the present invention comprises an accessory cooler, a heat exchanger that supplies cooling water to the accessory cooler, and circulating cooling water between the accessory cooler and the heat exchanger. A leakage monitoring device for use in an accessory cooling water system, which includes a pipe that allows the cooling water to flow, a surge tank that is connected in the middle of the pipe and stores cooling water, and a measuring unit that measures the water level of the surge tank.
The leakage monitoring device for the auxiliary cooling water system of the present invention comprises a first temperature measuring device provided in the pipe on the outlet side of the heat exchanger and a second temperature measuring device provided in the pipe on the inlet side of the heat exchanger. A temperature measurement facility, a storage section for pre-storing the correspondence relationship between the temperature of the cooling water and the amount of change in volume of the cooling water, and the exit side of the heat exchanger of the cooling water measured by the first temperature measurement facility. temperature information, temperature information on the inlet side of the cooling water heat exchanger measured by the second temperature measurement equipment, and information on the water level of the surge tank measured by the measurement unit. , the effect of volume change is removed by correcting the surge tank water level measured by the measurement unit based on the correspondence stored in the storage unit and the temperature information acquired by the acquisition unit. A correction unit that calculates the corrected water level and a determination unit that determines that cooling water has leaked based on the corrected water level calculated by the correction unit.

According to the leakage monitoring device for the accessory cooling water system of the present invention described above, even when the temperature of the cooling water changes, such as when the plant starts and stops, the influence of the volume change of the cooling water can be removed to detect leakage.
Furthermore, according to the leakage monitoring device for the accessory cooling water system of the present invention, it is possible to detect not only the outflow of cooling water but also the inflow of lubricating oil from the source to be cooled into the accessory cooling water system.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a system diagram showing the configuration of an accessory cooling water system equipped with a leakage monitoring device according to Embodiment 1 of the present invention; It is an example of a correlation diagram between the temperature of cooling water and the specific volume change rate. FIG. 2 is a system diagram showing a configuration of an example of a conventional accessory cooling water system;

Hereinafter, embodiments and examples according to the present invention will be described with reference to sentences or drawings. However, the structure, materials, and various other specific configurations shown in the present invention are not limited to the embodiments and examples taken up here, and can be appropriately combined and improved within the scope of not changing the gist. is. Elements that are not directly related to the present invention are omitted from the drawing.

A leakage monitoring device for an accessory cooling water system according to the present invention comprises an accessory cooler, a heat exchanger that supplies cooling water to the accessory cooler, and circulating cooling water between the accessory cooler and the heat exchanger. A leakage monitoring device for use in an accessory cooling water system, which includes a pipe that allows the cooling water to flow, a surge tank that is connected in the middle of the pipe and stores cooling water, and a measuring unit that measures the water level of the surge tank.
That is, the leakage monitoring device for an accessory cooling water system of the present invention is applied to an accessory cooling water system having an accessory cooler, a heat exchanger, and a surge tank.

The leakage monitoring device for the auxiliary cooling water system of the present invention comprises a first temperature measuring device provided in the pipe on the outlet side of the heat exchanger and a second temperature measuring device provided in the pipe on the inlet side of the heat exchanger. It has temperature measurement equipment, a storage unit, an acquisition unit, a correction unit, and a judgment unit.
The storage unit preliminarily stores a correspondence relationship between the cooling water temperature and the volume change amount of the cooling water.
The acquisition unit obtains information on the temperature of the cooling water at the outlet side of the heat exchanger measured by the first temperature measuring equipment, and the temperature of the cooling water at the inlet side of the heat exchanger measured by the second temperature measuring equipment. and information on the water level of the surge tank measured by the measuring unit.
The correction unit corrects the water level of the surge tank measured by the measurement unit based on the correspondence stored in the storage unit and the temperature information acquired by the acquisition unit, thereby reducing the influence of the volume change. Calculate the corrected water level that has been removed.
The determination unit determines that the cooling water has leaked based on the corrected water level calculated by the correction unit.

According to the configuration of the leakage monitoring device for the accessory cooling water system of the present invention, the correcting unit measures the By correcting the water level of the surge tank that has been calculated, the corrected water level is calculated from which the influence of the volume change is removed, and the judging part judges that the cooling water has leaked based on the corrected water level calculated by the correcting part.
As a result, even when the cooling water temperature changes, such as when the plant starts and stops, it is possible to detect leakage by removing the influence of the cooling water volume change on the basis of the calculated corrected water level.
In addition, since the influence of the volume change of the cooling water can be removed, it is possible to detect even a very small leakage corresponding to the volume change due to the temperature change of the cooling water.
Since even a very small leak can be detected in this way, it is possible to detect not only the outflow of cooling water but also the inflow of lubricating oil from the source to be cooled into the cooling water system of the auxiliary machine.

In the configuration of the leakage monitoring device described above, the storage unit may be configured to store the correspondence relationship in the form of a function or a change width of the specific volume corresponding to the temperature at a predetermined temperature interval.
That is, in the case of this configuration, the correspondence relationship is stored in the form of a function or the change width of the specific volume corresponding to the temperature in the predetermined temperature interval, so that the stored correspondence relationship and the first temperature measuring equipment and It is possible to calculate the volume change relatively easily from the temperature information measured by the second temperature measurement equipment.

In the configuration of the leakage monitoring device described above, the correction unit calculates the amount of change in the surge tank water level due to temperature changes using the correspondence relationship and temperature information, and calculates the surge tank water level measured by the measurement unit as It is also possible to adopt a configuration in which the corrected water level is calculated by correcting with the calculated amount of change.
That is, in the case of this configuration, the corrected water level can be calculated relatively easily using the calculated amount of change in the surge tank water level and the surge tank water level measured by the measuring unit.

In addition, instead of the first temperature measurement equipment and the second temperature measurement equipment in the configuration of the leakage monitoring device described above, the temperature of the cooling water of the surge tank itself is measured, or the cooling water of the piping connected to the surge tank is measured. It is also conceivable to measure the temperature.
However, it is difficult to accurately detect the temperature change of the circulating cooling water because the locations where these temperatures are measured undergo less temperature changes than the piping through which the cooling water circulates. Therefore, it is difficult to remove the influence of the volume change of the cooling water when the temperature of the cooling water changes, and the same effect as the configuration of the leakage monitoring device described above cannot be obtained.

Next, specific examples of the present invention will be described.

(Conventional accessory cooling water system)
First, prior to describing an embodiment of a leak monitoring device for an accessory cooling water system according to the present invention, the configuration of a conventional accessory cooling water system will be described as a comparison with the present invention.
FIG. 3 is a system diagram showing a configuration of an example of a conventional accessory cooling water system.

The auxiliary equipment cooling water system (secondary cooling system) 20 shown in FIG. It has temperature control valves 7 and 8 , cooling water temperature measuring equipment 9 , controller 10 and accessory cooler 11 .
A surge tank 1 stores cooling water.
A measuring unit 2 measures the water level of the surge tank 1 .
The controller 3 is connected to the measuring unit 2 and the make-up water valve 4 , and controls the measurement of the water level of the surge tank 1 by the measuring unit 2 and the opening/closing operation of the make-up water valve 4 .
The cooling water pump 5 sends cooling water to the accessory cooler 11. The heat exchanger 6 sends the cooling water (secondary coolant) of the accessory cooling water system (secondary cooling system) 20 to the primary cooling system. Heat is exchanged with water (primary coolant) to remove heat from the coolant (secondary coolant) of the accessory coolant system (secondary coolant system) 20 .
The temperature control valves 7 and 8 change the flow rate of cooling water passing through the temperature control valves 7 and 8 by opening and closing the valves to adjust the temperature of the cooling water.
The cooling water temperature measuring equipment 9 is provided on the outlet side of the heat exchanger 6 , specifically between the temperature control valves 7 and 8 and the accessory cooler 11 .
The controller 10 is connected to the temperature control valves 7 and 8 and the cooling water temperature measurement equipment 9, and measures the opening and closing operations of the temperature control valves 7 and 8 and the temperature of the cooling water in the cooling water temperature measurement equipment 9. to control.
The accessory cooler 11 is supplied with the cooling water (secondary cooling system) of the accessory cooling water system (secondary cooling system) 20, so that the coolant of the tertiary cooling system (oil, water, gas, etc.) material) to cool the tertiary coolant.

The cooling water is sent by the cooling water pump 5, the heat is removed by the heat exchanger 6, the heat is recovered from the auxiliary equipment cooler 11, and the cooling water is sent again by the cooling water pump 5 to circulate in the closed circuit. ing.
Also, the surge tank 1 absorbs the expansion and contraction of the cooling water due to the rise and fall of the temperature of the cooling water by the water level.
The measuring unit 2, together with the controller 3 and the make-up water valve 4, has a function of automatically supplying the make-up water W when the water level in the surge tank 1 falls below a set value.

In the configuration of the accessory cooling water system (secondary cooling system) 20 shown in FIG. detection, etc., it is possible to detect the presence or absence of leakage of cooling water.
However, in the configuration of the accessory cooling water system (secondary cooling system) 20 shown in FIG. It is difficult to distinguish volumetric expansion/contraction due to temperature change of water. Further, in the case of a very small leak, it takes a long time to detect the amount of supplementary water and the operation frequency of the supplementary water valve 4 .

(Example 1)
Next, an embodiment of a leakage monitoring device for an auxiliary machine cooling water system according to the present invention will be described.
FIG. 1 is a system diagram showing the configuration of an accessory cooling water system equipped with a leakage monitoring device according to Embodiment 1 of the present invention.

The accessory cooling water system (secondary cooling system) 30 shown in FIG. 1 measures the surge tank 1 and the water level of the surge tank 1, similarly to the accessory cooling water system (secondary cooling system) 20 shown in FIG. A measurement unit 2, a controller 3, a make-up water valve 4, a cooling water pump 5, a heat exchanger 6, temperature control valves 7 and 8, a cooling water temperature measurement facility 9, and an auxiliary equipment cooler 11 have.
Although not shown in the accessory cooling water system (secondary cooling system) 30 shown in FIG. , a controller for controlling the opening and closing operations of the temperature control valves 7 and 8 .
In the accessory cooling water system (secondary cooling system) 30 shown in FIG. 1, these components common to the accessory cooling water system (secondary cooling system) 20 shown in FIG. It has the same function as the water system (secondary cooling system) 20 .

The leakage monitoring device of the first embodiment particularly includes a correction water level gauge 21, a calculator 22, and a cooling water temperature measuring device 23.

The cooling water temperature measuring equipment 23 is installed on the inlet side of the heat exchanger 6 of the accessory cooling water system 30 and measures the temperature of the cooling water (secondary cooling water) on the inlet side of the heat exchanger 6 .
That is, the cooling water temperature measuring equipment 23 corresponds to the first temperature measuring equipment provided in the piping on the outlet side of the heat exchanger in the configuration of the leak monitoring device of the present invention.
On the other hand, the cooling water temperature measuring equipment 9 provided in the same way as the accessory cooling water system 20 in FIG. Corresponds to measuring equipment.

The computing unit 22 includes a measuring unit 2 that measures the water level of the surge tank 1, a cooling water temperature measuring device 23 installed on the inlet side of the heat exchanger 6 of the auxiliary cooling water system 30, and the heat exchanger 6 of the auxiliary cooling water system 30. It is connected to the cooling water temperature measuring equipment 9 installed on the outlet side of the .
The calculator 22 takes in temperature signals of the cooling water at the inlet side of the heat exchanger 6 and the outlet side of the heat exchanger 6 from the cooling water temperature measuring device 23 and the cooling water temperature measuring device 9, and calculates the correction water level. to calculate

The corrected water level gauge 21 is connected to the calculator 22 and displays the corrected water level calculated by the calculator 22 .

Further, although not shown, the computing unit 22 has a storage unit, an acquisition unit, a correction unit, and a determination unit.
The storage unit preliminarily stores a correspondence relationship between the cooling water temperature and the volume change amount of the cooling water.
The acquisition unit obtains the cooling water temperature measured by the cooling water temperature measuring equipment (first temperature measuring equipment) 23 and the cooling water temperature measuring equipment (second temperature measuring equipment) 9 on the outlet side of the heat exchanger 6. Information on the temperature and temperature on the inlet side, and information on the water level of the surge tank 1 measured by the measuring unit 2 are acquired.
The correction unit corrects the water level of the surge tank measured by the measurement unit based on the correspondence stored in the storage unit and the temperature information acquired by the acquisition unit, thereby reducing the influence of the volume change. Calculate the corrected water level that has been removed.
The determination unit determines that the cooling water has leaked when the corrected water level fluctuates. The corrected water level is normally constant at a predetermined corrected water level value, but the corrected water level fluctuates when cooling water leaks.

Here, FIG. 2 shows an example of a correlation diagram between the temperature of the cooling water and the change in the specific volume of the cooling water.
In the correlation diagram shown in FIG. 2, the change in specific volume increases as the temperature of the cooling water increases. In addition, since the correlation diagram shown in FIG. 2 is a downwardly convex curve, the higher the temperature, the greater the change in the specific volume per temperature rise of 1 degree.

In the leakage monitoring device of this embodiment, when no leakage occurs, the corrected water level obtained by correcting the actually measured water level of the surge tank 1 by the amount of change in volume of the cooling water is constant.
On the other hand, when the corrected water level fluctuates, the leakage monitoring device of the present embodiment determines that leakage has occurred in the accessory cooling water system.

Next, a specific theoretical formula for calculating the corrected water level in the calculator 22 will be described.
First, let G1 (kg) be the mass of cooling water from the heat exchanger 6 to the heat load (auxiliary equipment cooler 11, hereinafter omitted) at an arbitrary reference temperature T0 (° C.), The mass of the cooling water up to the exchanger 6 is assumed to be G2 (kg).
Also, let Q (m ³ ) be the volume of all the cooling water in the accessory cooling water system 30 .
Then, let Q1 (m ³ ) and U1 (m ³ /kg) be the volume and average specific volume of cooling water from the heat exchanger 6 to the heat load at temperature T1 (° C.), respectively. Also, let Q2 (m ³ ) and U2 (m ³ /kg) be the volume and average specific volume of the cooling water from the heat load to the heat exchanger 6 at temperature T2 (° C.), respectively.
At this time, the following formula (1) holds.
Q = Q1 + Q2
=G1×U1+G2×U2 (1)

In addition, the specific volume, the total cooling water volume, the cooling water volume from the heat exchanger 6 to the heat load, and the cooling water volume from the heat load to the heat exchanger 6 at the reference temperature T0 (° C.), respectively, Assuming U0 (m ³ /kg), Q'(m ³ ), Q1'(m ³ ), and Q2'(m ³ ), the following equation (2) holds.
Q'=Q1'+Q2'
= (G1 + G2) x U0 (2)

Next, assuming that the cross-sectional area of the surge tank 1 is A (m ² ), the actually measured tank water level is L (m), and the tank water level at the reference temperature T0 is L', volume change of cooling water from the reference temperature T0 and surge Since the changes in the amount of water in the tank 1 are the same, the following formula (3) holds.
Q−Q′=A×(L−L′) (3)
From this, the tank water level L' at the reference temperature T0 can be expressed by the following equation (4).

Here, by substituting Q and Q' in the above equations (1) and (2), the water level L' of the surge tank 1 at the reference temperature T0, which is free from the influence of the volume change of the cooling water, is given below. (5).

Even if the actually measured water level L and the temperatures T1 and T2 change, the surge tank water level L' at the reference temperature T0 is constant.
Therefore, in the leak monitoring device of the present embodiment, the judging section judges that a leak has occurred when the corrected water level L' fluctuates.

In the leakage monitoring device of the present embodiment, for example, the presence or absence of leakage can be detected by obtaining the corrected water level L' by the procedure described below.

In the accessory cooling water system 30, the cooling water masses G1 and G2 at the reference temperature T0, the cross-sectional area A of the surge tank 1, and the cooling water specific volume U0 at the reference temperature T0 are constants.
First, these constants G1, G2, A and U0 are measured or calculated in advance. Then, the values obtained by measurement or calculation are stored in the storage section of the calculator 22 .
In addition, even if it is difficult to directly measure the masses G1 and G2 of the cooling water at the reference temperature T0, the internal volume of the pipe in the section where the mass is to be calculated is calculated, and the calculated internal volume and the cooling water at the reference temperature T0 It can be determined from the specific gravity or specific volume of

Also, the correspondence (correlation) between the temperature of the cooling water and the width of change in the specific volume of the cooling water is obtained in advance, such as the correlation diagram shown in FIG. 22 is stored in the storage unit.
The above correspondence relationship can be stored in the form of, for example, a function such as a quadratic function, a width of change in the specific volume corresponding to a predetermined temperature interval (eg, 1° C., 0.1° C., etc.), etc. is. If stored in these forms, the stored correspondence can be called up from the storage unit, and the volume can be relatively easily obtained from the correspondence and temperature information measured by the cooling water temperature measuring equipment 23, 9, respectively. It becomes possible to calculate the amount of change.
The relationship between the temperature of the cooling water and the width of change in the specific volume of the cooling water varies depending on the composition of the cooling water (purity of the water, substance and content of the contents in the water, etc.). Investigate the correspondence between

During monitoring, the measured value L of the water level of the surge tank 1, the measured value T1 of the temperature of the cooling water temperature measuring equipment 9, and the measured value T2 of the temperature of the temperature measuring equipment 23 are obtained.
Next, using the correlation between the temperature of the cooling water and the width of change in the specific volume of the cooling water stored in the storage unit of the calculator 22, the respective temperatures T1 and T2 are obtained from the measured temperature values T1 and T2. The width of change in the specific volume of the cooling water at T2 is obtained.
Further, from the change width of the specific volume of the cooling water at the respective temperatures T1 and T2, the change width of the specific volume of the cooling water at the reference temperature T0, and the specific volume U0 of the cooling water at the reference temperature T0, the temperature T1 , T2 of the cooling water are determined.
Then, the calculated specific volumes U1 and U2 of the cooling water, the constants G1, G2, A, and U0 stored in the storage unit of the computing unit 22, and the measured value L of the water level of the surge tank 1 are used as described above. Substituting into equation (5), the corrected water level L' of the surge tank 1 at the reference temperature T0 is calculated.
Furthermore, by comparing the calculated value of the corrected water level L' of the surge tank 1 obtained by calculation with the value of the corrected water level L' in the normal state (predetermined value of L'), the fluctuation of the corrected water level L' Therefore, it is possible to detect the presence or absence of leakage.

Further, in the accessory cooling water system, it takes several minutes for the cooling water to circulate once through the system. Therefore, there is a time lag between the measured temperature value and the change in the specific volume/volume of the cooling water.
In the leakage monitoring device of this embodiment, when the fluctuation of the corrected water level recovers within the time range of this deviation, it is determined that no leakage has occurred.

Here, the flow rate of the cooling water in the auxiliary equipment cooling water system 30 is W (m ³ /s), the time for the cooling water to reach the heat load from the heat exchanger 6, and the time for the cooling water to reach the heat exchanger 6 from the heat load , H1(s) and H2(s) respectively, the following equation (6) holds.

When the temperature measurement point is near the inlet/outlet of the heat exchanger 6, H1 is the lead time and H2 is the lag time, so the time lag is +H1 to -H2, and the expected lag time is predicted in advance. be able to.
Then, taking into account the estimated lag time, it is determined that there is leakage when the fluctuation of the corrected water level is detected outside the range of the lag time.

According to the configuration of the leakage monitoring device of the present embodiment, in the computing unit 22, the correcting unit in the measuring unit based on the correspondence stored in the storage unit and the temperature information acquired by the acquiring unit By correcting the measured water level L of the surge tank 1, a corrected water level L′ from which the influence of the volume change is removed is calculated, and the determination unit determines the corrected water level based on the corrected water level L′ calculated by the correcting unit. When L' fluctuates from the normal corrected water level L' (predetermined value), it is determined that cooling water has leaked.
As a result, even when the temperature of the cooling water changes, such as when the plant starts and stops, leakage can be detected by removing the influence of the volume change of the cooling water based on the calculated corrected water level L'.
In addition, since the influence of the volume change of the cooling water can be removed, it is possible to detect even a very small leakage corresponding to the volume change due to the temperature change of the cooling water.
Since even a very small leak can be detected in this way, it is possible to detect not only the outflow of cooling water but also the inflow of lubricating oil from the source to be cooled into the cooling water system of the auxiliary machine.

The present invention is not limited to the above-described embodiments and examples, and includes various modifications. For example, the above-described embodiments and examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

1 surge tank, 2 measuring unit, 3 controller, 4 make-up water valve, 5 cooling water pump, 6 heat exchanger, 7, 8 temperature control valve, 9, 23 cooling water temperature measurement equipment, 21 correction water level gauge, 22 calculation vessel, 30 auxiliary machine cooling water system

Claims (3)

an auxiliary cooler;
a heat exchanger that supplies cooling water to the accessory cooler;
a pipe for circulating cooling water between the accessory cooler and the heat exchanger;
a surge tank connected to the middle of the pipe and storing cooling water;
A leakage monitoring device for use in an accessory cooling water system, comprising a measurement unit that measures the water level of the surge tank,
a first temperature measuring device provided in the pipe on the outlet side of the heat exchanger;
a second temperature measuring device provided in the pipe on the inlet side of the heat exchanger;
a storage unit that stores in advance a correspondence relationship between the temperature of the cooling water and the amount of change in volume of the cooling water;
Information on the temperature of cooling water at the outlet side of the heat exchanger measured by the first temperature measuring equipment and the temperature of the cooling water on the inlet side of the heat exchanger measured by the second temperature measuring equipment and information on the water level of the surge tank measured by the measuring unit;
By correcting the water level of the surge tank measured by the measurement unit based on the correspondence stored in the storage unit and the temperature information acquired by the acquisition unit, the influence of volume change a correction unit that calculates a corrected water level from which
A leakage monitoring device for an accessory cooling water system, comprising: a determination unit that determines that cooling water has leaked based on the corrected water level calculated by the correction unit. 2. A leak monitoring device for an auxiliary cooling water system according to claim 1, wherein said storage unit stores said correspondence relationship in the form of a function or a change width of specific volume corresponding to temperatures at predetermined temperature intervals. The correction unit calculates the amount of change in the water level of the surge tank due to temperature changes using the correspondence relationship and the temperature information, and calculates the amount of change in the water level of the surge tank measured by the measurement unit. 2. A leakage monitoring device for an accessory cooling water system according to claim 1, wherein the corrected water level is calculated by correcting the water level.

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