JPS63302397A - Device for malfunction diagnosis of reactor containment vessel - Google Patents

Abstract

PURPOSE:To diagnose malfunctions quickly by estimating abnormal causes from the data base corresponding to various abnormal causes by the use of the signal of an abnormality judgement device when an appointed deviation is produced between operating and normal data signals. CONSTITUTION:Changes of process parameters are transmitted in operating data input device 2 as an operating data signal 11, and the operating data signals are compared with the normal data signal 12 from the normal data storage device 3 by the use of an abnormality judgment device 4. For an example, leak of reactor water and the like occurs in a reactor containment vessel, a deviation produces between an operating data signal 11 and a normal data signal 12 as the leakage increases and a switch 6 is actuated by an abnormality detecting signal 5 from the judgment device 4. In this phase the normal data signal 12 and the operating data signal 11 which represents abnormality from the judgment device 4 are output in an operating condition abnormality estimation device 7, a chemical condition abnormality estimation device 8 and an operating pattern estimation device 9. The estimated results from the above estimation devices 7, 8, 9 are shown on a display 10. Therefore, malfunction can be diagnosed quickly without need of assembling experts and trying to find the cause on each accident, 2 operating data input device 3 normal data storage device 4 abnormality judgment device 7 operating condition abnormality estimation device 8 chemical condition abnormality estimation device 9 operating pattern abnormality estimation device 10 display.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an abnormality diagnosis device for diagnosing atmospheric abnormalities in a nuclear reactor containment vessel, and in particular, to an abnormality diagnosis device that can diagnose an atmospheric abnormality in a nuclear reactor containment vessel, and in particular, an atomic abnormality that can be diagnosed reliably and quickly. The present invention relates to an abnormality diagnosis device for a reactor containment vessel.

(Prior Art) A large number of important equipment and piping, such as a reactor pressure vessel and a recirculation pump, are arranged inside a nuclear reactor containment vessel (hereinafter referred to as PCV). When an abnormality occurs in various equipment or piping within the PCM, depending on the cause of the abnormality, it is necessary to immediately stop the operation of the nuclear power plant.

However, since N2 gas is always sealed inside the PCM, even if an abnormality occurs, it is not possible to enter the PCM and inspect it, and various operating data inside the PCM can be obtained outside the PCV to determine the cause of the abnormality. must be investigated.

Investigating the cause requires specialized knowledge and experience.
Expert engineers from various fields gather to analyze and analyze various operational data.
The reality is that we are evaluating and investigating the cause.

(Problems to be Solved by the Invention) As mentioned above, in order to investigate the causes of abnormalities within the PCV, specialized engineers from various fields come together to analyze and evaluate various operational data within the PCV. However, it is difficult to reliably gather such specialized engineers at the required time. For this reason, even if an abnormality occurs in the PCV, there is a problem that it takes time to investigate the cause or that an appropriate diagnosis cannot be made.

The present invention has been made in consideration of these points,
It is an object of the present invention to provide an abnormality diagnosis device for a nuclear power plant containment vessel that can quickly and reliably diagnose abnormalities in a PCV.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an operation data input device into which an operation data signal in a reactor containment vessel is input, and a steady data signal when the operation data signal continues for a predetermined period of time and becomes stable. A steady data storage device stores appropriate data, and the operating data signal from the operating data input device is compared with the steady data signal from the steady data storage device to determine whether an abnormality has occurred in the reactor containment vessel based on a change in the operating data. When a predetermined deviation occurs between the abnormality determination device, the operation data signal, and the steady data signal, the operation data signal and the steady data signal are input from the abnormality determination device, and various causes of the abnormality and countermeasures are determined in advance. This is an abnormality diagnosis device for a nuclear power plant containment vessel, which includes an abnormality inference device that infers the cause of an abnormality from a database that stores changes in operating data, and a display device that displays the inference results from this abnormality inference device.

(Function) When an atmospheric abnormality occurs in the PCV, the operating data signal from the operating data input device and the steady data signal from the steady data storage device are compared in the abnormality determiner, and further operating data is output from the abnormality determiner. The signal and the steady data signal are input to the abnormality inference device, the cause of the abnormality is inferred from a database stored in advance by the abnormality inference device, and the result of this inference is displayed on the display device.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. The figure is a diagram showing an embodiment of an abnormality diagnosis device for a nuclear power plant containment vessel according to the present invention.

In the figure, an operating data input device 2 to which an operating data signal 11 in a PCV (not shown) is input, and a steady data input device 3 to which the operating data signal 11 is also input are provided. This steady data input device 3 operates when the operation data signal 11 continues to be stable for a predetermined period of time (α time).
This operation data signal 11 is stored as a steady data signal 12 at appropriate times. Further, an abnormality determination device 4 is connected to the operation data input device 2 and the steady data storage device 3.
An operating data signal 11 is inputted to the abnormality determination device 4 from the operating data input device 2, and a steady data signal 12 is inputted from the steady data storage device 3.

This abnormality determination device 4 compares the operating data signal 11 and the steady data signal 12, and if a predetermined deviation (β) occurs between the two signals 11°12, a switching device connected to the abnormality determination device 4 The abnormality detection signal 5 is output to the terminal 6. When the abnormality detection signal 5 is input to the switching device 6, the switching device 6 is opened, and the operating data signal 11 and steady data signal 12 are transmitted from the abnormality determining device 4 to the operating state abnormality inference device 7, the chemical state abnormality inference device 8, and Input C to driving pattern abnormality inference device 9
Ru.

The operating state abnormality inference device 7, the chemical state abnormality inference device 8, and the operating pattern abnormality inference device 9 each have a database that stores various causes of abnormalities in the PCV and changes in operating data corresponding thereto. Changes in operating data that correspond to various causes of abnormalities stored in the database are determined based on the knowledge and experience of experts, various experimental results, theoretical formulas, and the like. Further, the driving state abnormality inference device 7, the chemical state abnormality inference device 8, and the driving pattern abnormality inference device 9,
Each operation data signal 11 is based on a database.
The cause of the abnormality in the PCv is inferred from the steady data signal 12 and the inference result is input to the display device 10.

Next, the operation of this embodiment having such a configuration will be explained.

The operation data signal 11 from the PCv generally includes temperature,
There is information such as pressure, drain amount, radioactivity, dust amount, etc., and this information is input into the constant operation data input device 2 and the steady data storage device 3.

In the steady data storage device 3, steady data 12 is stored.

For example, when a reactor water or main steam leak occurs in the PCv, process parameters such as the drywell local cooler drain rate and the floor condensate sump (HCW) drain rate gradually increase from a steady state.

, Changes in these process parameters are sent to the operation data input device 2 as an operation data signal 11, and compared with the steady data signal 12 from the steady data storage device 3 in the abnormality determiner 4. When a deviation of β or more occurs between the operation data signal 11 from the operation data input device 2 and the steady data signal 12 from the steady data storage device 3 due to an increase in the amount of leakage, the abnormality determination unit 4 detects an abnormality. The signal 5 activates the switch 6.

At this stage, the abnormal operation data signal 11 and steady data signal 12 that are abnormal are outputted from the abnormality determination device 4 to the operational state abnormality inference device 7, the chemical state abnormality inference device 8, and the driving pattern abnormality inference device 9.

Among the information included in the operating data signal 11 and the steady data signal 12, operating state data such as dry well local cooler drain amount, HCW drain amount, recirculation pump mechanical seal pressure, etc. are input to the operating state abnormality inference device 7. . The operating state abnormality inference device 7 infers the occurrence and location of leakage of reactor water or main steam in the PCv from changes in the dry well local cooler drain amount, for example, based on a pre-prepared database. Chemical state data such as sump drain analysis results are input to the chemical state abnormality inference device 8 . Then, based on a pre-prepared database, for example, leaks from the reactor complex can be inferred from changes in radioactivity, or leaks from auxiliary equipment can be inferred from changes in the concentration of sulfite used in the rust preventive material for auxiliary equipment.

Further, the driving pattern abnormality inference device 9 receives driving pattern data such as daily changes in drain amount. For example, it is known that there are characteristics in daily changes in the amount of condensate depending on the location of the condensate leakage, and based on a database that stores these characteristics, it is possible to detect changes in the amount of condensate from leaks from the valve gland, leaks from the valve seat, etc. Infer leakage, etc.

The inference results from these abnormality inference devices 7, 8.9 are displayed on the display device 10.

According to this embodiment, when an atmospheric abnormality occurs in the PCv, the operating state abnormality inference device 7, the chemical state abnormality inference device 8, and the operational pattern abnormality inference device 9 each use a database stored in advance. Therefore, it is possible to reliably and quickly infer an abnormality in the atmosphere within the PCv.

In the above embodiment, an example was shown in which the operating state abnormality inference device 7, the chemical state abnormality inference device 8, and the driving pattern abnormality inference device 9 were provided separately, but it is also possible to provide an abnormality inference device having these three functions independently. It's okay.

〔Effect of the invention〕

According to the present invention, when an abnormality in the atmosphere occurs in the PCv, the abnormality in the atmosphere in the PCv is inferred based on a database stored in advance by the abnormality inference device and displayed on the display device.

Therefore, there is no need to gather experts every time an abnormality occurs as in the past, and abnormalities within the PCv can be reliably and quickly diagnosed.
This ensures safe operation of nuclear power plants.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of an abnormality diagnosis device for a nuclear power plant containment vessel according to the present invention. 2... Operating data input device, 3... Steady data storage device, 4... Abnormality determiner, 6... Switching device, 7...
Operating state abnormality inference device, 8... Chemical state abnormality inference device, 9... Operating pattern abnormality inference device, 10... Display device, 11... Operating data signal, 12... Steady data signal.

Claims (1)

[Claims] an operation data input device into which an operation data signal in the reactor containment vessel is input; a steady data storage device that appropriately stores a steady data signal when the operation data signal continues for a predetermined period of time and becomes stable; and the operation data input device. an abnormality determination device that compares the operating data signal from the operating data signal with the steady data signal from the steady data storage device and determines the occurrence of an abnormality in the reactor containment vessel from a change in the operating data; If a predetermined deviation occurs between the two, the operating data signal and steady data signal are input from the abnormality determiner, and the cause of the abnormality is inferred from a database that stores various abnormality causes and corresponding changes in operational data. An abnormality diagnosis device for a nuclear reactor containment vessel, comprising an abnormality inference device and a display device that displays the inference results from the abnormality inference device.