JP2001311791A - Method and device for monitoring radiation contamination situation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for monitoring a radiation contamination situation, applicable to radiation leakage accident in a mechanized manner and capable of accurately seizing the radiation contamination situation. SOLUTION: Mobile radiation measurement posts 5 are transferred and placed at plural points L1-L8 for measuring radiation leakage from nuclear power facilities 30A, 30B, 30C so that radiation doses measured by the plural radiation measurement posts 5 are taken in for detecting the radiation contamination situation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for monitoring the status of radiation contamination when radiation leakage occurs from a nuclear facility handling nuclear materials.

[0002]

2. Description of the Related Art Recently, radiation leakage has been regarded as a problem from nuclear facilities handling nuclear materials. Should a radiation leak accident occur from a nuclear facility,
In other words, it is necessary to monitor the status of radiation contamination.

Conventionally, in order to detect a radiation leak accident in a nuclear facility, fixed radiation measuring posts for measuring radiation dose are installed at several places surrounding the nuclear facility. The installation of fixed type radiation measurement posts at many points is limited in terms of installation cost and maintenance cost, and is usually about four.

[0004] The fixed type radiation measurement post transmits the radiation measurement value to an off-site center such as a prefectural office or a government office by wireless communication. A specific frequency band for wireless communication is assigned to the radiation measurement post in advance. At the off-site center, radiation measurement values transmitted from fixed radiation measurement posts are constantly monitored to check for radiation leakage accidents.

[0005]

In the prior art, fixed radiation measuring posts for measuring radiation dose are installed at several places surrounding a nuclear facility to detect a radiation leak accident. However, in the event that a radiation leak accident occurs from a nuclear facility, it is necessary to accurately grasp the state of radiation leakage, that is, the state of radiation contamination.

The state of radiation contamination is greatly affected by weather conditions such as wind speed and direction. Therefore, simply measuring the radiation dose with a fixed radiation measurement post cannot respond to the radiation contamination situation that changes due to weather conditions with agility, and it is difficult to accurately grasp the radiation contamination situation. Further, when a radiation leak accident occurs due to an earthquake or the like, it is conceivable that the fixed radiation measurement post becomes abnormal and the radiation leak accident cannot be detected.

Therefore, in the event that a radiation leak accident occurs from a nuclear facility, there is a strong demand for the development of a technology capable of accurately grasping the state of radiation leakage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to respond to a radiation leak accident with agility and to accurately grasp the state of radiation contamination. It is to provide a monitoring method and a monitoring device.

[0009]

A feature of the present invention is that a radiation measuring post is transferred to a plurality of points where radiation leakage is to be measured, and the radiation dose measured by the plurality of radiation measuring posts is measured. We have tried to detect the status of radiation contamination.

According to the present invention, a radiation measuring post is transferred to a plurality of points where radiation leakage is to be measured, and the radiation measuring posts are taken in to detect a radiation contamination state by taking in the radiation dose measured by the plurality of radiation measuring posts. I have. A radiation measurement post (hereinafter also referred to as a mobile radiation measurement post) is transported and placed at multiple points in a nuclear facility where a radiation leak has occurred, and the radiation dose is measured. The measurement post can be collected, transported to a plurality of points in another area, and relocated to measure the radiation dose. As described above, it is possible to respond to a radiation leak accident with agility and agility, so that it is possible to accurately grasp the state of radiation contamination.

Further, even if a radiation leak accident occurs due to an earthquake or the like and the fixed radiation measurement post becomes abnormal, the radiation leakage accident can be reliably detected by transferring and disposing the movable radiation measurement post. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given of an embodiment in which one embodiment of the present invention is mounted on a vehicle.

FIG. 1 is a plan view of a monitoring vehicle, and FIG. 2 is a cross-sectional view thereof. 1 and 2, the monitoring vehicle 1 has a driver seat 6,
A monitoring room 7 and a facility room 8 are provided, and are surrounded by a shielding member 9 to prevent radiation exposure for manned operation. In the monitoring room 7, a wireless device 10 and a personal computer (hereinafter abbreviated as a personal computer) 11 for displaying a radiation dose received by the wireless device 10 on a screen are arranged. PC 1
Numeral 1 stores map data managed by coordinates in a memory (not shown). The personal computer 11 can be operated and monitored by a monitor (not shown) sitting on the chair 12.

The equipment room 8 is provided with an air conditioner 14, a generator 15 and a heat exchanger 16. A night vision camera 17 is provided outside the surveillance vehicle 1 so as to inform the driver of the situation outside the vehicle during night driving. In other words, it is intended to allow the driver to drive forward in normal situations, but to drive backward so as not to be exposed to radiation near the accident site.

The monitoring vehicle 1 is also provided with a radiation detector 18 for measuring the radiation level outside the vehicle, an antenna 19, a GPS antenna 20 for detecting the position of the vehicle, and a wind speed / wind indicator 21.

FIG. 3 shows an example of the transport vehicle 2 which transports the movable radiation measuring post 5 used in the present invention. Inside the cab of the transport vehicle 2 is a wall 2 for shielding radiation such as neutrons and gamma rays.
The roof is provided with a sampling port 24 for taking in the atmosphere, a radiation detector 25 for detecting the radiation dose, an eye camera for observing the situation outside the vehicle, a device 26 for nighttime illumination, a rotating light 27, and the like. I have.

A plurality of movable radiation measurement posts 5 are mounted in the luggage compartment of the carrier 2 and a crane 28 is provided so as to be installed at a predetermined point. A radio antenna 3 for transmitting position data where the radiation measurement post 5 is installed is provided on the carrier 2.
2 are provided. Needless to say, a personal computer for transmitting the installation position data of the radiation measurement post 5 is also provided, but is not shown.

FIG. 4 shows an example of a movable radiation measuring post 5. In FIG. 4, reference numeral 33 denotes a main body, which is provided with wheels 34 capable of running on its own, and inside which various measurement control devices are mounted. A radiation detector 35 for detecting radiation, in particular, gamma rays and neutrons, is provided at an upper part of the main body 33.
A D camera 36 is provided. The radiation measurement value measured by the radiation measurement post 5 is wirelessly transmitted from the wireless antenna 37 to the monitoring vehicle 1. The frequency used by the mobile radiation measurement post 5 for wireless communication is usually assigned a different frequency band from the frequency used by the fixed radiation measurement post.

When it is impossible for the carrier 2 to enter a narrow road or a point having a high radiation dose level, the movable radiation measuring post 5 is provided with wheels 34 and a CCD camera 36 which can travel by themselves.
Therefore, it can be moved and arranged at an arbitrary point by controlling the movement from the carrier 2. In addition, the direction can be changed after being installed, or a point between the radiation measuring post 5 and another radiation measuring post 5 can be arbitrarily moved.

The monitoring of the state of radiation contamination in such a configuration will be specifically described. Figure 5 shows road 3
Nuclear facilities 30A, 30B, 3 on site 31 surrounded by 4
0C is provided, indicating that a radiation leak accident has occurred from the nuclear facility 30A. At the four corners of the site 31, fixed radiation measurement posts 3 are provided.

The monitoring vehicle 1 and the transport vehicle 2 go to a point where there is no risk of being exposed to the radiation, and a peripheral map as shown in FIG. That is, the measurement point of the radiation dose is set. For example,
It is set as L1 to L8 in FIG. The measurement points L1 to L8 are also set in the vicinity of the fixed radiation measurement post 3 like the measurement points L2, L3, L5, and L7.

The carrier 2 transports the movable radiation measuring post 5 to the set measuring points L1 to L8 and installs it using a crane 28. The installation position of the radiation measurement post 5 is wirelessly transmitted from the carrier 2 to the monitoring vehicle 1 for confirmation. In this way, the movable radiation measurement post 5 is connected to each of the measurement points L1 to L1.
L8 are sequentially arranged.

The radiation measurement values of the mobile radiation measurement posts 5 arranged at the measurement points L1 to L8 are stored in the radio 1 of the monitoring vehicle 1.
0 is received by the personal computer 11. PC 11
Displays the captured radiation measurement values on a map displayed on the screen or as a radiation intensity distribution map. Surveillance car 1
Is usually sent to the off-site center.

When the radiation dose at the measurement points L1 to L8 does not change and measurement is performed at another point, the measurement points are set again, for example, as measurement points M1 to M6 in FIG. The mobile radiation measurement post 5 is collected by the carrier 2 and rearranged, or the mobile radiation measurement post 5 is self-propelled and the measurement point M1 is measured.
To M6. The radiation measurement values of the movable radiation measurement posts 5 at the measurement points M1 to M6 are captured by the personal computer 11 and displayed on the screen.

In this way, the state of radiation contamination due to the radiation leakage accident is monitored. The movable radiation measurement posts are transported and arranged at a plurality of points where radiation leakage is to be measured. The radiation dose measured by is taken in to detect the radiation contamination status. The mobile radiation measurement posts are transferred to multiple locations of the nuclear facility where the radiation leak occurred, the radiation dose is measured, the radiation measurement results are collected, and the radiation measurement posts are collected and transferred to multiple locations in other areas. It can be transferred and repositioned to measure the radiation dose. Therefore, it is possible to respond to a radiation leak accident with agility and agility, and it is possible to accurately grasp the state of radiation contamination regardless of weather conditions.

Further, even if a radiation leakage accident occurs due to an earthquake or the like and the fixed radiation measurement post becomes abnormal, the radiation leakage accident can be reliably detected by transferring and disposing the movable radiation measurement post.

Further, by closely disposing the movable radiation measurement posts, it is possible to more accurately and accurately grasp the state of radiation contamination.

Although the monitoring vehicle and the carrier are different vehicles in the above-described embodiment, it is obvious that the monitoring and the carrier may be performed by one vehicle.

[0029]

According to the present invention, a mobile radiation measuring post is transferred and arranged at a plurality of points in a nuclear facility where a radiation leakage accident has occurred to measure a radiation dose, and the radiation measuring post is determined based on the radiation measurement result. It can be collected, transported to multiple locations in other areas, and relocated to measure radiation dose. Therefore, it is possible to respond to a radiation leak accident with agility and agility, and it is possible to accurately grasp the state of radiation contamination regardless of weather conditions.

[Brief description of the drawings]

FIG. 1 is a plan view of a monitoring vehicle showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a configuration diagram illustrating an example of a transport vehicle that transports a mobile radiation measurement post according to the present invention.

FIG. 4 is a configuration diagram illustrating an example of a mobile radiation measurement post according to the present invention.

FIG. 5 is an explanatory diagram of a monitoring operation according to the present invention.

FIG. 6 is an explanatory diagram of a monitoring operation according to the present invention.

FIG. 7 is an explanatory diagram of a monitoring operation according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Monitoring vehicle, 2 ... Carrier, 3 ... Fixed radiation measurement post, 5 ... Mobile radiation measurement post, 11 ... Personal computer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiko Maniwa 3-2-2, Sachimachi, Hitachi, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Inventor Takashi Yatsuka 3-2-2, Sachimachi, Hitachi, Ibaraki No. 2 Within Hitachi Engineering Services Co., Ltd. (72) Inventor Toshihiko Toshinhiko 2-2-2, Sachimachi, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Takio Mano 3-chome, Sachimachi, Hitachi City, Ibaraki Prefecture No. 1-1 F-term in Hitachi, Ltd. Hitachi Works (reference) 2G075 AA01 AA17 AA18 BA12 CA01 DA08 DA10 EA03 FA13 FA18 FB01 FC03 FC15 FD01 GA01 GA09 GA19 GA21 GA37 2G088 AA07 EE11 EE21 FF17 JJ36 KK20 KK32 KK32 MM

Claims (9)

[Claims] An object of the present invention is to monitor the state of radiation leakage in a nuclear facility, wherein a radiation measurement post is transferred to a plurality of points where radiation leakage is to be measured, and the radiation measurement post is measured by the plurality of radiation measurement posts. A radiation contamination status monitoring method, characterized in that the radiation contamination status is detected by taking in a quantity. 2. A radiation monitoring system for monitoring the state of radiation leakage in a nuclear facility, wherein a radiation measuring post having a transmitting function is transferred and arranged at a plurality of predetermined points where radiation leakage is to be measured. A radiation contamination status monitoring method, wherein a radiation contamination value transmitted from a measurement post is input and displayed on a screen to detect a radiation contamination status. 3. A radiation measuring post for monitoring a radiation leak situation of a nuclear facility in which a radiation measuring post is fixedly arranged, wherein the radiation measuring post having a transmission function is transferred to and arranged at a plurality of points where radiation leakage is to be measured. Then, the arrangement positions of the plurality of radiation measurement posts are input as the position information of the map, and the radiation measurement values transmitted from the plurality of radiation measurement posts are input, the map is displayed on the screen, and the radiation contamination state is detected. Characteristic radiation contamination monitoring method. 4. A radiation monitoring post for monitoring a radiation leakage situation of a nuclear facility in which a radiation measuring post is fixedly arranged, wherein the radiation measuring post having a radio transmission function is transported by a vehicle to a plurality of points where radiation leakage is to be measured. Receiving the radiation measurement values transmitted from the plurality of radiation measurement posts as the position information of the map with the arrangement positions of the plurality of radiation measurement posts and displaying the radiation concentration distribution on a display device mounted on the vehicle. A method for monitoring the status of radiation contamination, characterized by displaying 5. A radiation monitoring system for monitoring a radiation leak situation in a nuclear facility, wherein the radiation measuring posts are respectively transferred to a plurality of points where the radiation leakage is to be measured, and the plurality of radiation measuring posts are arranged at the plurality of points. A radiation pollution status monitoring device comprising a digital calculation means for taking in the radiation dose measured in (1) and detecting the radiation pollution status. 6. A radiation monitoring apparatus for monitoring a radiation leakage situation in a nuclear facility, wherein the radiation measurement is transmitted from a plurality of radiation measurement posts having a transmission function and transferred to a plurality of predetermined points where the radiation leakage is to be measured. A radiation contamination status monitoring device comprising a computer for inputting a value and displaying it on a screen to detect a radiation contamination status. 7. A radiation monitoring system for monitoring a radiation leakage situation in a nuclear facility in which radiation measuring posts are fixedly arranged, wherein a plurality of radiation measuring posts having a transmission function are transferred and arranged at a plurality of points where radiation leakage is to be measured. The computer further includes a computer that displays the radiation measurement values transmitted from the plurality of radiation measurement posts on a map screen with the arrangement positions of the plurality of radiation measurement posts as position information of a map and detects a radiation contamination state. Radiation pollution status monitoring device. 8. A method for monitoring a radiation leakage situation in a nuclear facility in which a radiation measuring post is fixedly arranged, wherein the radiation measuring post having a radio transmission function is transferred by a vehicle to a plurality of points where radiation leakage is to be measured. A personal computer mounted on the vehicle that receives the radiation measurement values transmitted from the plurality of radiation measurement posts as the position information of the map, and displays the radiation concentration distribution on the screen. A radiation contamination status monitoring device comprising a computer. 9. A radiation measurement post having a radio transmission function is transported and arranged at a plurality of points in a nuclear facility where radiation leakage is to be measured, and the arrangement positions of the plurality of radiation measurement posts are used as map position information as the position information. A radiation contamination status monitoring vehicle comprising a personal computer that receives radiation measurement values transmitted from a plurality of radiation measurement posts and displays the radiation contamination status on a screen.