JP3032106B2 - Plant equipment health monitoring and diagnosis method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention for relates to a nuclear, thermal, relates to health monitoring diagnostics how the plant equipment in contact with circulating water such as circulating water pump for use in power plants and chemical plants such as hydroelectric, etc., in particular In advance, malfunctions such as deterioration and breakage of plant equipment due to circulating water corrosion are detected in advance,
About the health monitoring diagnostic how suitable plant equipment for maintenance and inspection in the fault occurrence before.

[0002]

2. Description of the Related Art Circulating water pumps used in nuclear power plants, thermal power plants, hydroelectric power plants, chemical plants, and the like use a variety of detection systems to detect malfunctions such as functional deterioration and breakage. The pump function was immediately stopped, and maintenance such as inspection and replacement and repair of the pump components was performed. For example, failures and abnormalities of the pump shaft are detected as positional displacement and acoustic changes due to shaft vibration, and defects and abnormalities of the mechanical seal are detected and maintained in addition to the above as changes in the pressure and temperature of the mechanical seal. Was.

In the method for diagnosing water quality of a nuclear power plant described in Japanese Patent Application Laid-Open No. 2-290595, leaks of ion-exchange resin of a condensate desalination unit are considered as abnormal events occurring in a feed / condensate system (primary cooling system). Contamination of organic impurities, seawater leak, breakdown of cation exchange resin ion exchange capacity of condensate desalination unit, breakdown of anion exchange resin ion exchange capacity of condensate desalination unit, regeneration of ion exchange resin of condensate desalination unit In order to identify the type of abnormal event such as a defect when it occurs, conduct conductivity and pH at a place where water quality changes when the abnormal event occurs and conduct conductivity and pH
Is determined, and the abnormal event is identified by comparing the correlation with a previously prepared correlation for each abnormal event.

Further, in the method for diagnosing nuclear reactor equipment described in Japanese Patent Application Laid-Open No. 4-1228893, an equipment in contact with the primary coolant of a nuclear power plant is detected in order to detect a sign of occurrence of a failure before the equipment reaches a failure. In the surface of the primary coolant contact surface or a material at a predetermined depth from the surface, a marker element that activates when exposed to neutrons was attached or dispersed, and γ-rays of specific energy were detected in the primary coolant At this time, an abnormality occurs in a device in contact with the primary coolant, and a sign of occurrence of a failure is detected by determining that the marker element has flowed into the primary coolant.

[0005]

However, in the prior art for detecting a failure or abnormality of a circulating water pump as a positional displacement or an acoustic change, and further, a change in pressure or temperature, it cannot be detected until immediately before the pump is damaged. In addition, problems and abnormalities of the circulating water pump used in nuclear power plants, etc., unavoidably cause unplanned shutdowns of the power plants, and thus impair the economics, safety and reliability of the power plants themselves. .

The prior art described in Japanese Patent Application Laid-Open No. 2-290595 is to identify an abnormal event after an abnormal event has occurred, and has the same problem as described above. In addition, this conventional technology has a problem that a leak of ion exchange resin in a condensate
It targets specific chemical abnormal events such as contamination of organic impurities and seawater leaks, and does not detect mechanical problems such as breakage of a circulation pump.

In the prior art described in Japanese Patent Application Laid-Open No. 4-1228893, activation of the marker element flowing out into the primary coolant is due to neutron irradiation in the reactor core, and the marker element is located at a position far from the pressure vessel. If the marker element elutes from the equipment to be removed, it will adhere to the tube wall before it reaches the reactor core or be captured by a desalter, etc. There is a problem that it cannot be predicted.

[0008] The purpose is the present invention, the generation timing of the malfunction plant equipment in contact with the circulating water to accurately predict, to provide a health monitoring method of diagnosing plant equipment which can be maintenance before failure occurs is there.

[0009]

[0010]

[0011]

To achieve the above Symbol purpose SUMMARY OF THE INVENTION The present invention provides a health monitoring method of diagnosing plant equipment in contact with the circulating water, due to the circulating water corrosion occurring components of plant equipment the water quality changes in the plant equipment measures the after start of use of plant equipment based on the measurement value
The time until the water quality change occurs was calculated, and this calculated
The time after starting use of the plant equipment for which
The correlation between the condition occurrence time and the time until water quality change occurs
In comparison, it predicts the time of occurrence of a failure of the plant equipment following the circulating water corrosion.

[0012]

The above-mentioned method for monitoring and diagnosing the health of plant equipment
Oite preferably measures the conductivity or pH of the circulating water inside or outlet portion of the plant equipment as changes in water quality in the plant equipment.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

In order to avoid unplanned shutdown of the reactor due to accidental failure of the reactor water recirculation pump installed in the piping system of the nuclear power plant in particular, the present inventors have determined the timing of the failure occurrence by some method. By predicting
The method of repair and maintenance of the reactor water circulation pump during the periodic inspection of the nuclear power plant immediately before the occurrence of the failure was studied. As a result, as a pre-failure stage, corrosion of circulating water occurs in pump components,
We found that the water quality in the pump changed due to this circulating water corrosion.Furthermore, since there was a correlation between the time until the occurrence of the malfunction and the change in the water quality in the pump, the time to the occurrence of the malfunction was detected by detecting this change in water quality. Discovered that it can be predicted.

It has also been found that a change in water quality in the pump due to corrosion of circulating water can be detected relatively easily by measuring conductivity or pH at a specific position inside and outside the pump.

The present invention is based on the above findings,
Water quality changes in plant equipment due to circulating water corrosion occurring in the components of the plant equipment are measured, and based on the measured values, water quality changes occur after the start of use of the plant equipment.
Calculate the time at and prepare the calculated time in advance.
Time and water quality change after the start of use of plant equipment
By comparing to the correlation of the time until
It is possible to accurately predict the time of occurrence of a failure and perform maintenance and inspection before the occurrence of the failure.

[0025]

Also, by measuring the conductivity or pH of the circulating water inside or at the outlet of the plant equipment, it is possible to measure the change in water quality inside the plant equipment.

[0027]

[0028]

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the background to the present invention and the principle of the present invention will be described in detail with reference to FIGS. As described above, the present inventors set the timing of occurrence of the failure by some method, in particular, in order to avoid unplanned shutdown of the reactor due to accidental failure of the reactor water circulation pump installed in the piping system of the nuclear power plant. The method of repair and maintenance of the reactor water circulation pump at the time of the periodic inspection of the nuclear power plant immediately before the occurrence of the failure was examined by accurately predicting. As a result, it was found that corrosion due to circulating water occurred in the pump components as a stage prior to the occurrence of the malfunction, and that the water quality in the pump was changed due to the circulating water corrosion.
Further, since there is a correlation between the time until the occurrence of the failure and the change in the water quality in the pump, it has been discovered that the time to the occurrence of the failure can be accurately predicted by detecting the change in the water quality, and the present invention has been made.

It has also been found that a change in water quality in the pump due to circulating water corrosion can be detected relatively easily by measuring the conductivity or pH at a specific position inside and outside the pump. The present invention has been made based on such circumstances.

Therefore, the principle of the present invention will be described more specifically. FIG. 2 is a diagram showing a typical configuration of a reactor water circulation pump installed in a piping system of a boiling water reactor.
This pump includes a motor shaft 1, a motor-side coupling 2, a key 3, a spacer coupling 4, a carbic tooth 5, a first-stage mechanical seal 6, a second-stage mechanical seal 7, a stud bolt 8, a shaft 9, a journal 1, and the like.
0, impeller ring 11, impeller 12, motor stand 1
3, main components of a seal flange cover 14, a mechanical seal cartridge 15, a heat exchanger 16, a circulation blade 17, a casing cover 18, an underwater bearing 19, a casing 20, a liner ring 21, and a splitter 22.

In the prior art, for example, a pressure gauge which is mainly attached to the second-stage mechanical seal 7 and measures a pressure change in that portion, and a thermometer which is provided in the mechanical seal cartridge 15 and detects a temperature change in that portion A displacement meter installed on the seal flange cover 14 to measure the axial vibration of the spacer coupling 4 and the shaft 9;
The acoustic spectrum analyzer that measures the acoustic spectrum change due to the vibration of the shaft is installed outside of the pump and detects the occurrence of malfunctions such as the deterioration of the pump function. Maintenance such as inspection and replacement and repair of parts was carried out.

The inventors of the present application have noticed that pump failures are often detected by changes in the acoustic spectrum, and the failures are detected by erosion and
Presumed to be caused by corrosion, in order to measure the water quality change in the pump until the occurrence of the malfunction, a conductivity meter and a pH meter were attached to the inside of the casing 20 or at the outlet portion following the pipe from the casing 20 to measure the conductivity and The pH was measured. As a result, as shown in FIG. 3, as a phenomenon before the failure is detected due to the acoustic change, the conductivity increases and p
It became clear that there was a behavior in which H decreased. However, acoustic changes were detected as a change in the wavelength (frequency) A ₀ 3D sound spectrum shown in FIG. 4 to A _1.

It is considered that the reason why the conductivity of the water quality in the pump increases and the pH decreases as a stage prior to the occurrence of the malfunction is that metal cations dissolved in the pump by erosion and corrosion are generated.

Further, as a result of repeating similar examinations for a plurality of erosion / corrosion defects, the time from the start of the pump operation (use) to the failure is defined as λb, and the conductivity increase and the conductivity increase after the start of the pump operation (use). Assuming that the time when the pH decrease occurs is λi, a correlation was obtained that λb> λi and that the ratio was constant. For some pumps, λb / λi = about 300. Therefore, λb / λi is measured in advance for various pumps. On the other hand, when the λi value is detected by continuously measuring the conductivity or the pH in the pump during operation, the occurrence of a problem that occurs thereafter Time λb can be predicted.

Further, by calculating λb−λi = λa, it is possible to know the possible operation time λa until a so-called failure occurs. Can also predict whether a failure will occur. For example, if the failure is the nth time (n
+1) If it is predicted that this will occur during the reactor periodic inspection, the maintenance and repair or repair / replacement of the pump during the nth reactor periodic inspection will not cause any trouble and will not cause any surplus. It can be used for a maximum period of time that can maintain the health of the pump without inspection.

Further, some test results have revealed that there is also a case where there is a correlation in which a malfunction occurs when the conductivity rises above a certain value or when the pH falls below a certain value. The change in water quality due to circulating water corrosion is p
It has been clarified that there is a correlation where a problem occurs when the pH exceeds a certain value at a portion where H rises. In these cases, the conductivity and p
H is set as the limit value, and the period up to the limit value is
It may be calculated from a conductivity-time correlation or a pH-time correlation prepared in advance, and thereby, as in the above-described method, the maximum which can maintain the soundness of the pump without causing any trouble and without an extra check. During the period, the pump can be operated.

Further, the method of the present invention can be applied not only to a circulating water pump, but also to various devices that come into contact with water in which erosion and corrosion occur, such as devices such as valves and valves provided in piping systems, and circulating devices other than nuclear power plants. It can also be used effectively as a method for monitoring and diagnosing the soundness of plant equipment that comes into contact with water and determining the maintenance and inspection timing before a failure occurs.

Further, the above method has been described in connection with the case where the failure is detected by a change in the acoustic spectrum. However, the failure occurrence time λb and the conductivity are not affected by the failure detected by other detecting means such as a pressure gauge and a thermometer. Rise or H
By measuring the occurrence time λi of the decrease, it is also possible to effectively use the method of predicting the time of occurrence of a failure and determining the maintenance and inspection time before the occurrence of the failure.

Next, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 5 is a schematic system diagram of a boiling water nuclear power plant according to one embodiment of the present invention. In FIG. 5, a reactor pressure vessel 101 containing a reactor core 100 is provided with a primary cooling system 102, a coolant recirculation system 103, and a reactor water purification system 104. In the primary cooling system 102, steam generated in the reactor pressure vessel 101 drives a turbine 106 through a main steam line 105, and is condensed in a condenser 107 to become condensed water. The water is purified by passing through a condensate desalter 109 by a condensate pump 108 provided in the reactor, and is returned to the reactor pressure vessel 101 via a feedwater pipe 112 through a feedwater pump 110 and a feedwater heater 111. The coolant recirculation system 103 is provided with a recirculation line 113 and a recirculation pump 114, and the primary cooling water in the reactor pressure vessel 101 is supplied to the recirculation pump 114.
Circulates through the recirculation line 113 and returns to the pressure vessel 101. The reactor water purification system 104 is provided with a purification system line 115, a purification system pump 116, and a reactor water purification device 117, and a part of the primary cooling water circulating in the recirculation system 103 is conducted to the reactor water purification system 104. As a result, impurities are purified and merge with the water supply in the water supply pipe 112. Condenser pump 108, water supply pump 110, recirculation pump 114, purification system pump 116
Is provided with a soundness monitoring and diagnosing device also serving as a maintenance and inspection time determining device according to the present embodiment. Hereinafter, a specific configuration of this apparatus will be described using the recirculation pump 114 as a representative.

In FIG. 1, the coolant recirculation pump 114
Is provided in the pipe 41 of the recirculation line 113, and the pipe 4
A high-temperature conductivity meter 42 is provided for online measurement of the water quality in the pump flowing through 1. The measured value of the high-temperature conductivity meter 42 is sent to a computer 43 for processing. The processing result is displayed on the display 44 installed in the monitoring room.
Will be displayed. FIG. 6 is a flowchart illustrating the processing performed by the computer 43. In the present embodiment, as a correlation equation between the time λb leading to the malfunction and the time λi at which the conductivity rise occurs, λb / λi = approximately 300 obtained in advance by an experiment for a pump of the same type as the recirculation pump 114 is stored in the computer 43. It is memorized.

In FIG. 6, measured values of conductivity are continuously inputted from the high-temperature conductivity meter 42 to the computer 43 (step 2).
00), it is determined whether or not the conductivity has changed based on the measured value (step 201). If the conductivity has not changed, the measurement is continued (step 202). When it is determined that the conductivity has risen, a time λi at which the conductivity rise has occurred is calculated based on the timer function (step 203), and the above-mentioned relational expression λb / λi between λi and λb stored in advance is about 30.
0 to calculate a time λb leading to a failure (step 2).
04), and based on λa = λb−λi stored in advance, a possible operation time λa until the occurrence of a failure is calculated (step 205). Further, when it is determined that the conductivity has increased, the operation time λ (1), λ (2) until the scheduled inspection of the reactor scheduled in the future based on the reactor periodic inspection schedule information stored in advance. ,... Λ (n), λ (n + 1),... (Step 206), and the operation times λ (1), λ (2),. (n + 1),... and the above-mentioned possible operation time λa (step 207).
1) The n value existing during the n-th time is finally obtained (steps 208 to 210), and it is determined that the pump is to be maintained, repaired, or replaced during the n-th periodic inspection period (step 211). The monitoring room also confirms that the pump can be used for the maximum period that can maintain the soundness of the pump without any trouble by performing maintenance inspection or repair / replacement of the pump during the period of the n-th periodic inspection, without any excess inspection. (Step 21).
1).

As described above, it is possible to accurately detect in advance the timing of occurrence of a malfunction such as deterioration or breakage of the function of the recirculation pump 114 due to corrosion of the circulating water, and to detect the occurrence of the malfunction before the occurrence of the malfunction.
Can be maintained and inspected. In addition, while avoiding unplanned shutdown of the power plant, and keeping track of the maximum healthy use period of the recirculation pump 114, the pump components can be minimized in accordance with the planned shutdown of the power plant or the like (at the time of periodic inspection). And maintenance such as replacement and repair can be performed, which is effective in improving the economy, safety and reliability of the power plant and the like.

Further, the coolant recirculation pump 1 of this embodiment
A pH meter may be used instead of the high-temperature conductivity meter 42 in FIG. In this case as well, the computer 56 performs the same processing as the processing shown in FIG. 6 to determine whether to perform maintenance, repair, or replacement of the pump during the n-th periodic inspection period, and to perform maintenance, repair, or repair. The display 44 installed in the monitoring room indicates that the pump can be used for a maximum period of time that can maintain the soundness of the pump without causing any trouble and without any extra inspection, thereby providing the same effect as the above embodiment. Can be

In the above-described embodiment, the soundness monitoring and diagnosing apparatus of the present invention has been described by using the recirculation pump 114 as a representative, but the condensate pump 108, the water supply pump 110, and the purification system pump 11
The same applies to the soundness monitoring and diagnosing device No. 6 in this case. In this case, unique values (described later) obtained by experiments may be used as the values of λb / λi, and the same effect can be obtained.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the present invention is applied to a reactor water purification system pump 116 shown in FIG.

In FIG. 7, the reactor water purification system pump 11
6 is provided on a pipe 51 of a purification system line 115, and a pipe 52 for taking out primary cooling water immediately after passing through the pump is provided at an outlet portion of the recirculation pump 114. The conductivity of the primary cooling water that has passed through the system 53 is measured and passed through the high-temperature conductivity meter 54 and the high-temperature conductivity meter 54 for online measurement of the water quality in the pump flowing into the purification system pump 116 through the pipe 51. A drain 55 for discharging the drained water is provided. The measured value of the high-temperature conductivity meter 54 is sent to a computer 56 for processing.
The processing result is displayed on a display 57 installed in the monitoring room. In the computer 56, λb / λi = approximately 350, which was previously obtained by an experiment on a pump of the same type as the purification system pump 116, is used as a correlation equation between the time λb at which the pump 116 malfunctions and the time λi at which the conductivity increases. I remember. The processing performed by the computer 56 is the same as that of the first embodiment shown in the flowchart of FIG.

That is, from the high-temperature conductivity meter 54, the computer 5
6. Continuously input the measured value of the conductivity into 6 (step 20).
0), it is determined whether or not the conductivity has changed based on the measured value (step 201). If the conductivity has not changed, the measurement is continued (step 202). When it is determined that the conductivity has risen, the time λi at which the conductivity rise has occurred is calculated based on the timer function (step 203), and the above-mentioned relational expression λb / λi between λi and λb stored in advance is approximately 350
Is used to calculate the time .lambda.b (step 20).
4) Further, based on λa = λb−λi stored in advance, a possible operation time λa until the occurrence of a failure is calculated (step 205). Further, when it is determined that the conductivity has increased, the operation time λ (1), λ (2) until the scheduled inspection of the reactor scheduled in the future based on the reactor periodic inspection schedule information stored in advance. ,... Λ (n), λ (n + 1),... (Step 206), and the operation times λ (1), λ (2),. (n + 1),... and the above-mentioned possible operation time λa (step 207).
1) The n value existing during the n-th time is finally obtained (steps 208 to 210), and it is determined that the pump is to be maintained, repaired, or replaced during the n-th periodic inspection period (step 211). The monitoring room also confirms that the pump can be used for the maximum period that can maintain the soundness of the pump without any trouble by performing maintenance inspection or repair / replacement of the pump during the period of the n-th periodic inspection, without any excess inspection. (Step 21).
1).

According to this embodiment, the same effects as those of the first embodiment can be obtained. Note that also in this embodiment, the high-temperature conductivity meter 54 is used.
May be used instead of pH meter. Further, in the present embodiment, the case where the present invention is applied to the purification system pump 116 has been described. However, similarly to the previous embodiment, the present invention is similarly applied to the condensate pump 108, the water supply pump 110, and the recirculation pump 114,
Similar effects can be obtained.

A third embodiment of the present invention will be described with reference to FIG. In the present embodiment, a condensate pump 108 shown in FIG.
It is applied to

In FIG. 8, a condensate pump 108 is provided in the pipe 61 of the condensate line 107A.
A pipe 62 for taking out the primary cooling water immediately after passing through the pump is provided at an outlet portion of the pump.
A pH meter 64 is provided for measuring the pH of the primary cooling water that has passed through the cooling system 63 and online measuring the water quality in the condensate pump 108 that has flowed through the pipe 61 into the condensate pump 108. The downstream side of the pipe 62 is a condensate pump 108 of the pipe 61
It is connected to the entrance part. The measured value of the pH meter 64 is sent to the computer 65 for processing. The processing result is displayed on a display 66 installed in the monitoring room. In the computer 65, λb / λi = approximately 830, which is obtained in advance by experiments for the same type of pump, is stored as a correlation equation between the time λb at which the pump 108 fails and the time λi at which the pH decreases. The processing performed by the computer 66 is the same as that of the first embodiment shown in the flowchart in FIG. 6 except that the “conductivity” becomes “pH”.

That is, p is transferred from the pH meter 64 to the computer 65.
The measured value of H is continuously input, and it is determined whether or not the pH has changed based on the measured value. When the pH does not change, the measurement is continued. When it is determined that the pH has decreased, a time λi at which the pH has decreased is calculated based on the timer function, and the above-mentioned relational expression λb / λi between λi and λb stored in advance is calculated.
= 830 is used to calculate the time λb leading to the failure, and further, based on λa = λb-λi stored in advance, the possible operating time λa until the occurrence of the failure is calculated. When it is determined that the pH has decreased, the operating times λ (1), λ (2), and λ (1) until the scheduled periodic inspection of the reactor based on the reactor periodic inspection schedule information stored in advance. … Λ
(n), λ (n + 1),... are calculated, and the operation times λ (1), λ (2),... λ (n), λ (n + 1),. By comparing the possible operation time λa, an n value in which the period in which the occurrence of the failure is predicted is present between the n-th and (n + 1) -th periodic inspections is finally obtained, and the pump is operated during the n-th periodic inspection period. Decide to perform maintenance, inspection or repair / replacement. The monitoring room also confirms that the pump can be used for the maximum period that can maintain the soundness of the pump without performing any maintenance and without any excess inspection by performing maintenance inspection, repair, or replacement of the pump during the n-th periodic inspection period. Is displayed on the display 66 installed in the.

According to this embodiment, the same effects as those of the first embodiment can be obtained. Further, in this embodiment, the water in the pump after the completion of the pH measurement is fed back to the inlet pipe side of the condensate pump 108, so that the rate of the pH decrease after the time λi at which the pH decrease occurs can be amplified and detected. This is a superior method for measurement. In this example, the pH meter 6 was used.
A high temperature conductivity meter may be used instead of 4. In the present embodiment, the case where the present invention is applied to the condensate pump 108 is described. However, the configuration of the present embodiment is similarly applied to the water supply pump 110, the recirculation pump 114, and the purification system pump 116, and the same effect is obtained. Is obtained.

In the above description, the case where the present invention is applied to a recirculation pump, a purification system pump, and a condensate pump has been specifically described. However, the structure shown in the first to third embodiments is shown in FIG. When applied to the water supply pump 110 shown in FIG.
The value of λb / λi was approximately 420.

[0055]

According to the present invention, it is possible to accurately detect in advance defects such as functional deterioration and breakage of plant equipment due to circulating water corrosion, and to perform maintenance and inspection before the occurrence of the defects.

Further, while avoiding unplanned shutdown of the plant and grasping and holding the maximum healthy use period of the plant equipment,
Maintenance such as minimum inspection and replacement and repair of the equipment components can be performed at the time of planned shutdown of the plant (at the time of periodic inspection). Therefore, economics of power plants, etc.,
Effective for improving safety and reliability.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for monitoring and diagnosing the integrity of a recirculation pump installed in a piping system of a boiling water reactor of a nuclear power plant according to a first embodiment of the present invention.

FIG. 2 is a typical configuration diagram of a reactor water circulation pump installed in a piping system of a boiling water reactor.

FIG. 3 is a diagram showing a relationship between a change in acoustic spectrum, conductivity, and pH and a pump operation time.

FIG. 4 is a diagram showing a result of three-dimensional acoustic spectrum analysis.

FIG. 5 is a schematic view showing a nuclear power plant according to an embodiment of the present invention including the recirculation pump shown in FIG. 1;

FIG. 6 is a flowchart showing processing contents of the computer shown in FIG. 1;

FIG. 7 is a schematic diagram of an apparatus for monitoring and diagnosing a pump of a reactor water purification system installed in a piping system of a boiling water reactor of a nuclear power plant according to a second embodiment of the present invention.

FIG. 8 is a schematic diagram of an apparatus for monitoring and diagnosing a condensate pump installed in a piping system of a boiling water reactor of a nuclear power plant according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor shaft 2 ... Motor side coupling 3 ... Key 4 ... Spacer coupling 5 ... Carbic tooth 6 ... 1st stage mechanical seal 7 ... 2nd stage mechanical seal 8 ... Stud bolt 9 ... Shaft 10 ... Journal 11 ... Impeller ring DESCRIPTION OF SYMBOLS 12 ... Impeller 13 ... Motor stand 14 ... Seal flange cover 15 ... Mechanical seal cartridge 16 ... Heat exchanger 17 ... Circulation blade 18 ... Casing cover 19 ... Underwater bearing 20 ... Casing 21 ... Liner ring 22 ... Splitter 42 ... Conductivity system 43 ... Computer 44 ... Display 52 ... Piping 53 ... Cooling gauge 54 ... Conductivity system 55 ... Drain 56 ... Computer 57 ... Display 62 ... Piping 63 ... Cooling gauge 64 ... pH system 65 ... Computer 66 ... Display 100 ... Core 101 ... Reactor pressure vessel 102 Primary cooling system 103 Coolant recirculation system 104 Reactor water purification system 105 Main steam line 106 Turbine 107 Condenser 107A Condenser line 108 Condenser pump 109 Condensate desalinator 110 Water supply Pump 111: Feed water heater 112: Water supply pipe 113: Recirculation line 114: Recirculation pump 115: Purification system line 116: Purification system pump 117: Furnace water purification device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Horiuchi 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Inside the Hitachi Plant (72) Yamato Asakura 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd., Hitachi factory (72) Inventor Kazuhiko Akamine 3-1-1, Sakaimachi, Hitachi, Ibaraki Pref. Hitachi, Ltd. Hitachi factory (56) References JP-A-4-138398 (JP, A JP-A-3-277938 (JP, A) Asakusa Y et al. , "Structural Material Real Anomaly Detection System Using Water Chemistry Data", J. Am. Nucl. Sci. Tec h. , 29 [11] (Nov. 1992) p. 1120-1126 (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 17/003 C02F 1/00 G01N 27/06 G08B 31/00 G21C 17 / 02 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A method for monitoring and diagnosing the soundness of plant equipment in contact with circulating water, wherein a water quality change in the plant equipment caused by circulating water corrosion occurring in a component of the plant equipment is measured, and the plant is measured based on the measured value. Water after starting use of equipment
Calculate the time until the quality change occurs, and calculate this time
After starting use of plant equipment that has been prepared in advance
The correlation between the time of occurrence and the time until water quality changes
A method for monitoring and diagnosing the health of a plant device, comprising predicting the time of occurrence of a failure of the plant device following the circulating water corrosion. 2. The method for monitoring and diagnosing plant equipment health according to claim 1, wherein the conductivity or pH of the circulating water at the inside or at the outlet of the plant equipment is measured as the water quality change in the plant equipment. Method for monitoring and diagnosing plant equipment.