JPS58158593A - Monitor device of atomic reactor plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention is a monitoring device for monitoring the status of nuclear reactor equipment.

[Technical background of the invention]

A conventional monitoring device for nuclear reactor equipment will be explained with reference to FIG. 1 in the figure is, for example, the wall of the reactor containment vessel,
This wall 1 seals the internal space. Equipment such as piping 2 and valves 3 are housed within the wall 1 . and,
Piping 2.

An ITV camera 4 is installed to monitor the valve 3.

The image of the ITV camera 4 is sent to the wall 1 through the cable 5.
It is configured to be displayed on a display device 6 installed outside. The cable 5 passes through a penetration portion 7 provided in the wall 1 and extends to the outside. The penetrating portion 7 is configured to allow the cable 5 to pass through and maintain airtightness between the wall 1 and the cable 5.

In the conventional example described above, a worker visually checked the display device 6 to monitor the state of the piping 2 and the like in the reactor containment vessel.

[Problems with background technology]

In the conventional monitoring device, the ITV camera 4 is installed inside the reactor containment vessel. When pipe 2 ruptures, high-temperature steam spouts out inside the reactor containment vessel, causing the temperature to rise to about 300 degrees.
It is expected that the temperature will reach a certain level. In such a case,
The ITv camera 4 was susceptible to heat and could break down. Furthermore, there was a problem in that if the ITV camera 4 broke down, it would not be possible to monitor the inside of the reactor pressure vessel. Also, IT'
When repairing and inspecting the V-camera 4, workers had to enter the reactor containment vessel where radiation levels were high, which resulted in an increase in radiation exposure to the working acid.

Furthermore, it is necessary to provide a penetration portion 7 through which the cable 5 passes through the wall 1 of the reactor containment vessel, and there is a risk that the airtightness of the reactor containment vessel may be deteriorated.

[Purpose of the invention]

The purpose of the present invention is to be able to monitor the status of nuclear reactor equipment from outside the walls of the reactor equipment, without fear of failure in the event of an accident, and to easily perform repairs and inspections from outside the reactor equipment. The purpose of the present invention is to provide a monitoring device for nuclear reactor equipment that can perform

[Summary of the invention]

The monitoring device for nuclear reactor equipment according to the present invention installs a plurality of sound receivers on the outer surface of the wall of the nuclear reactor equipment, uses these sound receivers to detect sound waves from a sound source inside the reactor equipment, and performs signal processing. A section is installed to use the sound waves from the sound receiver as signal waves to create a sound wave hologram, and the position and shape of the sound source are reproduced from this sound wave hologram, so that the status inside the reactor equipment can be monitored from outside the reactor equipment. That's what I did.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG. 1 in the diagram
Reference numeral 01 denotes a wall of a nuclear reactor equipment, for example, a reactor containment vessel, and this wall 1θ1 hermetically seals the internal space. Inside the wall 101 is a pipe 102. Equipment such as a valve 103 is housed. These piping 102. A sound is generated from the valve 1θ3 when fluid flows, and if leakage occurs from the pipe 102 or the valve 1θ3 is malfunctioning, an abnormal sound different from normal noise is generated. A plurality of sound receivers 1θ4 are installed on the outer surface of the wall 1θ1, and are configured to detect sound waves from internal equipment and convert them into sine wave signals.

The signal from the sound receiver 104... is transmitted to the signal processing unit 1θ5
transmitted to. This signal processing section 105 is the signal processing circuit 1
061 oscillator 1θ7. The oscillator 107 is configured to transmit a sine wave signal to the signal processing circuit 106 and to adjust the frequency of the sine wave signal. The signal processing circuit 106 creates a sound wave hologram by interfering the =5- sine wave signal from the sound receiver 104 with the sine wave signal from the transmitter 107, and determines the position of the sound source from this sound wave hologram. It is configured to calculate and output a reproduction signal for reproducing the shape. And the memory circuit 10
B is provided to transmit the reproduction signal to the pipe 102.B. Valve 1
03 is configured to store a reproduction signal in a normal state. The above playback signal is transmitted to a color CRT as a display section.
109 and is configured to display images of the sound source created by different frequencies of the sine wave signal from the oscillator 107 in different colors.

The above structure has the following effects.

Internal piping 102. Since the state of the valve 1θ3 can be monitored, the piping 102. The state of valve 103 can be monitored. Piping 102. The reproduced signal when the valve 103 is normal is stored in the memory circuit 10B, and when an accident occurs, the image of the sound source in the normal state is projected [7] It can be easily compared with the image of the sound source at the time of the accident. You can know when an accident has occurred.

Since the oscillator 107 has a variable frequency, it can project an image of the sound source even if the frequency of the sound source changes. Since each frequency is displayed in a different color, it is easier to know when an accident has occurred.

Furthermore, since there is no need for workers to enter the reactor containment vessel when repairing or inspecting the monitoring device, the work is easy and the amount of radiation exposure during the work can be reduced.

Since there is no need to provide a penetration part in the wall body 1θ1 yet, there is no fear that internal gas will leak from the penetration part, and the reliability of the reactor containment vessel can be improved.

Note that the present invention is not limited to the above embodiment. For example, the display unit can display the accident image and the normal image side by side to facilitate visual comparison.

[Effect of invention]

The monitoring device for nuclear reactor equipment according to the present invention installs a plurality of sound receivers on the outer surface of the wall of the nuclear reactor equipment, uses these sound receivers to detect sound waves from a sound source inside the reactor equipment, and performs signal processing. A section is provided to use the sound waves from the sound receiving section as a signal wave to create a sound wave hologram, and the position and shape of the sound source are reproduced from this sound wave hologram, and a display section is provided to display an image of the reproduced sound source. This is what I did. therefore,
It is not necessary to install monitoring equipment inside the reactor equipment, and the status of equipment inside the reactor equipment can be reliably monitored even in the event of an accident. Its effects are outstanding, such as reducing the radiation exposure of workers without having to enter the reactor, and improving the reliability of nuclear reactor equipment.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional monitoring device for nuclear reactor equipment, and the second part is a block diagram showing an embodiment of the present invention.
102... Piping (equipment), 103... Valve (equipment),
104... Sound receiver, 105... Signal processing unit, 106
... Signal processing circuit, 1o7... Transmitter, 108...
-Memory circuit, 109...color CRT (display section). Applicant's agent Patent attorney Takehiko Suzue 9- -5・

Claims (3)

[Claims] (1) Multiple sound receivers installed at multiple locations on the outer surface of the reactor equipment wall to detect sound waves generated from equipment inside the reactor equipment and convert them into electrical signals, and the sound receivers from these receivers. a signal processing section that creates a sound wave hologram using the signal as a signal wave and reproduces the position and shape of the sound source in the sound wave hologram; and a memory that stores the playback signal when the device is in a normal state among the playback signals from the signal processing section. 1. A monitoring device for nuclear reactor equipment, comprising: a circuit; and a display section that compares and displays reproduced signals from the signal processing section and the storage circuit. (2) The signal processing unit includes a signal processing circuit and a transmitter, and uses a signal from the transmitter as a reference wave to interfere with the signal wave, and the signal processing circuit creates a sound wave hologram. A monitoring device for nuclear reactor equipment according to claim (1). (3) The monitoring device for nuclear reactor equipment according to claim 12, wherein the transmitter has a variable frequency.