JP2002311182A - Dose management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dose management system capable of indicating an integral dose value predicted for a worker to be exposed before going to an actual work place. SOLUTION: An entrance/exit management device 10 stores a dose rate at a work place in a memory 3a. In an entering process, an integral dose value predicted for a worker 30 to the exposed is calculated from a planned work time of the worker 30 and the dose rate of the work place, which is output to a display 6a. The entrance/exit management device 10 for an exit process reads the integral dose value out of a personal dose monitor 20 which the worker 30 held and outputs it to a work dose rate calculation means 19. The work dose rate calculation means 19 calculates a work dose rate from the integral dose value and stores it in the memory 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure management system for managing radiation exposure dose of a worker who works in a control area such as a nuclear power plant.

[0002]

2. Description of the Related Art Workers working in a controlled area such as a nuclear power plant (hereinafter referred to as workers) are obliged to manage the radiation exposure dose value and the working time in the controlled area.

[0003] Conventionally, workers carry personal dosimeters and carry out work in controlled areas. When entering a controlled area, the dose values that are planned for the work
The planned dose value) and the work time (hereinafter, referred to as the planned work time) are set in the personal dosimeter. The personal dosimeter measures the actual dose value (hereinafter referred to as the actual dose value) and the work time (hereinafter referred to as the actual work time). If the actual dose value exceeds the planned dose value during the work, or If the time exceeds the planned work time, an audible alarm sounds and the worker is notified. The worker recognizes the alarm condition based on the alarm sound and the display value of the personal dosimeter, and leaves the control area.

Next, the situation at the work site will be described.
As an example, a situation of overhaul of equipment contaminated with radioactive materials will be described. Disassembly of equipment contaminated with radioactive material releases contaminants sealed inside the equipment into the air at the work site. As a result, the environmental dose rate at the work site (hereinafter referred to as the environmental dose rate) increases. Radiation managers are required to minimize the work plan dose value and the work plan work time, and to reduce the increase of the environmental dose rate on a small scale by removing pollutants and installing shields. Implement measures limited to a short time.
The status of these work sites is monitored by a dust monitor that detects pollutants in the air and an area monitor that measures the environmental dose rate, and is stored in the radiation management computer.

As described above, the environmental dose rate at the work site changes from moment to moment. However, changing the worker's work plan dose value and work plan work time in response to the situation at the work site with reference to the environmental dose rate stored in the radiation control computer is Since this is representative data, there is a problem that there is a difference from the dose rate actually received by the worker (hereinafter, referred to as the work dose rate), and therefore, it is not actually performed. Normally, at the work site, the radiation manager or the worker himself / herself performs an operation of changing the work plan dose value and the work plan work time in consideration of the environmental dose rate. Although such a setting change at the work site informs the worker of the situation at the work site and has the effect of reducing the exposure dose, it sometimes burdens the radiation manager and the worker.

In addition to the above method of referring to the environmental dose rate,
The work dose rate is monitored in real time, the time required to reach the work planning work time is calculated from the work dose rate and the accumulated dose value received up to the present, and the alarm sound of the personal dosimeter is changed to perform the work. Japanese Patent Laid-Open No. Hei 5
-223944.

[0007]

In an operation in which the work plan dose value and the work plan work time are changed in consideration of the environment dose rate output from the area monitor, the environmental dose rate is representative data of the work place. In some cases, it was slightly different from the environmental dose rate actually received by workers. Also, in the method of monitoring the work dose rate in real time and calculating the time required to reach the work planning work time from the work dose rate and the accumulated dose value received up to the present, the work dose rate has to go to the actual work site. There was a tendency to set the work plan dose value and the work plan work time to be on the safe side because it would not be clear unless they were known.

[0008] The present invention has been made in view of the above points, and in the departure processing, the latest work dose rate is analyzed by analyzing the integrated dose value of the worker who has completed the work at the work site. Calculate and store. And in the entry processing,
Based on the latest work dose rate, the integrated dose value expected to be received by the worker is calculated and displayed. Furthermore, an exposure management system that can display the integrated dose value that is expected to be applied to the worker before the worker goes to the work site by capturing the dose rate data close to the work status in real time and the work site situation is provided. The purpose is to do.

[0009]

An exposure management system according to claim 1 is an exposure management system including a personal dosimeter and an access control device, wherein said personal dosimeter detects radiation. Radiation detection means to perform and the ID of the worker
A storage unit for storing a number, a work plan work time and a work plan dose value, a reading unit for communicating with the access control device, and a display unit for outputting an integrated dose value; A storage unit for storing a work dose rate at a work site, a reading unit for communicating with the personal dosimeter, a display unit for outputting an integrated dose value expected to be received by the worker, An ID card reading unit that reads an ID card; in the entry processing, the entry / exit area management device reads a work plan work time and a work plan dose value of the worker from the personal dosimeter; The work dose rate at the work site is input from the computer, the integrated dose value that the worker is expected to receive at the work site is calculated, and output to the display unit.

[0010] According to the exposure management system of the first aspect, in the entry processing, the worker can confirm the integrated dose value expected to be received by the worker before going to the actual work site, so that the work planning can be performed. When the working time or the work plan dose value is small, countermeasures can be taken in advance, such as changing the setting of the work plan work time and the work plan dose value, or changing the inclination of the work.

An exposure management system according to a second aspect of the present invention is an exposure management system including a personal dosimeter and an access control device, wherein the personal dosimeter includes radiation detecting means for detecting radiation, A storage unit for storing an operator's ID number, a work plan work time, and a work plan dose value; a reading unit for communicating with the access control device; and a display unit for outputting an integrated dose value. An area management device, a storage unit that stores a work dose rate at a work site, a reading unit that communicates with the personal dosimeter, a display unit that outputs an integrated dose actually received by the worker, An ID card reading section for reading an ID card carried by the user, and a work dose rate calculating means for inputting an integrated dose value from the personal dosimeter and calculating a work dose rate. The means are carried by the workers. It reads the cumulative dose values from the individual dose measuring device which has been, to calculate the work dose rate from the time the cumulative dose value and the worker has been staying in the controlled area,
The information is stored in the storage unit.

According to the exposure management system of the second aspect, in the leaving area processing, the entrance / exit area management device reads the integrated dose value from the personal dosimeter carried by the worker,
Since the work dose rate is calculated from the integrated dose value and the time during which the worker stayed in the management area, the work dose rate that is the latest and close to the actual work situation at the work site can be obtained.

According to a third aspect of the present invention, in the exposure management system according to the second aspect, the working dose rate calculating means sets an effective time of the working dose rate in advance, and uses only the working dose rate collected during the effective time. To adopt.

According to the exposure management system of the third aspect, in addition to the same effects as those of the second aspect,
By setting the effective time of the work dose rate in advance,
Since only the working dose rate collected during the effective time is adopted,
The latest work dose rate at the work site can be obtained.

According to a fourth aspect of the present invention, in the exposure management system according to the second aspect, the working dose rate calculating means sets an upper limit value of the working dose rate in advance and adopts only the working dose rate less than the upper limit value. Things.

According to the exposure management system of the fourth aspect, in addition to the same effects as those of the second aspect,
By setting the upper limit of the work dose rate in advance, only the work dose rate less than the upper limit is adopted, eliminating the effects of abnormally high work dose rate recorded due to failure of personal dosimeter. can do.

According to a fifth aspect of the present invention, in the exposure management system according to the second aspect, the working dose rate calculating means registers in advance a management number of a personal dosimeter used to collect an integrated dose value. Only the integrated dose value of the personal dosimeter is adopted.

According to the exposure management system of the fifth aspect, in addition to the same effects as those of the second aspect,
By registering the management number of the personal dosimeter used for collecting the integrated dose value in advance, only the integrated dose value of the registered personal dosimeter is adopted. In particular, when collecting an integrated dose value at a high working dose rate, a worker installs a personal dosimeter for collection at the work site and collects the personal dosimeter for collection after a specified time has elapsed. Since the operation dose rate data is collected by the above operation, the time during which the worker stays at the work site with a high working dose rate can be suppressed to the shortest time, so that the integrated dose value received by the worker can be reduced.

According to a sixth aspect of the present invention, in the exposure management system according to the second aspect, the work dose rate calculating means registers in advance an ID number of a worker who executes collection of an integrated dose value.
Only the integrated dose value of the personal dosimeter carried by the worker of the registered ID number is adopted.

According to the radiation exposure management system of the sixth aspect, in addition to the same effects as those of the second aspect,
By registering the ID number of the worker who collects the integrated dose value in advance, only the integrated dose value of the personal dosimeter carried by the worker of the registered ID number is adopted. For this reason, it is possible to limit the variation in the conditions for collecting the integrated dose value, and it is possible to improve the reliability of the work dose rate.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an exposure management system comprising a personal dosimeter, an access control device and a radiation management computer according to the present invention will be described below.

First, the overall system configuration will be described. FIG. 1 is a configuration example of an exposure management system according to the present invention.
Reference numeral 10 denotes an access control device, reference numeral 20 denotes a personal dosimeter, reference numeral 30 denotes an operator, reference numeral 40 denotes a management area, and reference numeral 50 denotes a work site.

The entry / exit area management device 10 has a control unit 1a, a storage unit 3a for storing the work dose rate at the work site, a reading unit 4a for communicating with the personal dosimeter 20, and a worker inputs a work number. Key input section 5a, display section 6a for outputting an integrated dose value expected to be received by the worker, ID card reading section 17 for reading an ID card carried by the worker, integrated dose value calculating means 18, working dose rate calculating means 19 are provided.

In the present embodiment, it is assumed that the work planning work time and the work planning dose value of the worker 30 have been set in the personal dosimeter 20 before entering the area.

When the worker 30 enters the management area,
The entry processing is performed by causing the entry / exit area management device 10 to read the personal dosimeter 20 and the ID card carried by the worker 30. At the time of the entry process, the entry / exit management device 10 reads the work dose rate and travel time of the work site stored in the storage unit 3a via the reading units 4a and 4b, and reads the worker's The work plan work time and the work plan dose value are read, the integrated dose value that the worker 30 is expected to suffer at the work site is calculated, and the manner in which the worker 30 increases the integrated dose value is output to the display unit 6a.

Table 1 shows the working dose rate and the moving time at the work site. Table 1 is a list showing an example of work place management data. As the work dose rate, three types of a high work dose rate Rh, a medium work dose rate Rm, and a low work dose rate Rl are stored.

[0027]

[Table 1]

[0028]

(Equation 1)

[0029]

(Equation 2)

[0030]

(Equation 3)

Equations 1 to 3 show an example of a calculation formula for calculating the integrated dose value from the working dose rate. In the environment of the high work dose rate Rh, the medium work dose rate Rm, and the low work dose rate Rl, each calculation formula indicates the travel time from the entry / exit area management device 10 to the work site and the travel time from the work site to the entry / exit area management device Calculate the integrated dose value when working during the work planning work time excluding the travel time of the work.

FIG. 2 shows a screen display. Access control device 1
0 outputs the integrated dose value, the work plan work time and the work plan dose value to the display unit 6a. The worker 30 can know the situation of the work site before going to the work site by referring to the manner in which the integrated dose value rises. Therefore, when changing the work plan dose value and the work plan work time, Index. By changing the above formula,
One, two, or four or more types of work dose rates may be used, and the travel time may be determined as the travel time from the access control device 10 to the work site and the travel time from the work site to the access control device. May be set separately and operated as a time including the work preparation time and the cleanup time.

The personal dose measuring device 20 includes a control unit 1b, a storage unit 3b for storing an ID number of the worker 30, a work plan work time and a work plan dose value, and a read unit 4b for communicating with the entrance / exit area management device 10. , A display section 6b for outputting an integrated dose value, and a radiation detecting means 9b for detecting radiation. The personal dosimeter 20 counts the pulse signal output from the radiation detecting means 9b and displays it as an integrated dose value on the display unit 6.
b. Also, by storing the integrated dose value in the storage unit 3b at a preset sampling time interval,
The integrated dose value indicating how the integrated dose value increases in a time series is stored. Table 2 shows an example of the work management data stored in the personal dosimeter 20. Table 2 is a list showing an example of data stored in the storage unit 3b of the personal dosimeter 20.

[0034]

[Table 2]

Next, the departure processing will be described. Worker 3
0, when leaving the control area, the entry / exit area management device 10 reads the personal dosimeter 20 and the ID card carried by the worker 30 to perform the exit processing. At the time of departure processing, the entrance / exit management device 10 reads the integrated dose value from the personal dosimeter 20 carried by the worker 30,
4b and output to the integrated dose value calculating means 18 and the working dose rate calculating means 19. Integrated dose value calculation means 1
8 rounds the integrated dose value in 0.001 mSv units and outputs it in 0.01 mSv units. The work dose rate calculation means 19 analyzes the integrated dose value, calculates the work dose rate, and outputs the calculated work dose rate to the storage unit 3a.

Next, a method in which the work dose rate calculating means 19 calculates the work dose rate will be described. FIG. 3 shows a graph of the integrated dose value of the work management data stored in the personal dosimeter 20 of the worker 30. FIG. 4 shows a graph in which the integrated dose value of FIG. 3 is approximated by one work dose rate and travel time. The work dose rate of the worker 30 is calculated by subtracting the integrated dose value received by the worker 30 from the travel time from the access control device 10 to the work site and the transfer time from the work site to the access control device 10. It is calculated by dividing by time.
Equation 4 shows an example of a calculation formula for calculating the work dose rate from the integrated dose value and the work time.

[0037]

(Equation 4)

The work dose rate of the worker 30 is totalized by the above formula. The lowest working dose rate is stored as a low dose rate, the average value as a medium dose rate, and the highest working dose rate as a high dose rate, in the storage unit 3a of the entrance / exit area management device 10.

Next, a method of setting an effective time of the working dose rate in advance and using only the working dose rate collected during the effective time will be described.

The radiation manager sets the effective time of the work dose rate in the entrance / exit area management device 10 before the worker 30 performs the area exit processing. The valid time is stored in the storage unit 3a of the entry / exit area management device 10. The valid time is set by two times, a start time and an end time. FIG. 5 shows a setting diagram of the effective time. In FIG. 5, the start time is 0.5 hour,
A case where the end time is set to 3.0 hours will be described as an example. The operator 30A has a pattern in which both the entry time and the exit time exceed the end time.

By setting the end time, it is possible to eliminate old data and adopt the latest work site situation as work dose rate data. The operator 30B has a pattern in which the entry time exceeds the end time but the exit time is between valid times. The adoption / non-adoption of the work dose rate of the entrance / exit processing beyond the end time can be determined by the judgment of the radiation manager. The worker 30C
This is a pattern in which both the entry time and the exit time are between valid times. If both the entry time and the exit time are between the valid times, they are adopted as the work dose rate. The worker 30D
The entry time is a pattern in which the entry time is in the valid time but the exit time is before the start time. The adoption / non-application of the work dose rate of the entrance / exit processing beyond the start time can be determined by the judgment of the radiation manager. The operator 30E has a pattern in which both the entry time and the exit time are before the start time. By setting the start time, it is possible to eliminate the work dose rate data when returning without going to the work site. In addition, when the area entry processing is performed first in the morning, the work dose rate data of the previous day expires, and the case where the work dose rate data to be referred to does not exist may occur. As a countermeasure, the effective time may be set separately for the high work dose rate, the medium work dose rate, and the low work dose rate, and the effective time may be set longer for the medium work dose rate and the low work dose rate. . Also, set the default value in advance,
If there is no work dose rate data to be referred to, it may be operated so as to refer to the default value.

Next, a method of setting an upper limit of the work dose rate in advance and using only the work dose rate less than the upper limit will be described.

The radiation manager sets the upper limit of the work dose rate in the entrance / exit area management device 10 before the worker 30 performs the area exit processing. The upper limit value is stored in the storage unit 3a of the entry / exit area management device 10. By setting the upper limit,
The work dose rate data when an abnormally high work dose rate is recorded due to the failure of the personal dosimeter 20 can be eliminated.

Next, a method of registering the management number of the personal dosimeter 20 used for collecting the integrated dose value in advance and using only the integrated dose value of the registered personal dosimeter 20 will be described.

The radiation manager sets the management number of the personal dosimeter 20 used for collecting the integrated dose value in the entrance / exit area management device 10 before the worker 30 performs the area exit processing.
The management number is stored in the storage unit 3a of the entry / exit area management device 10. By setting the management number, it is possible to define a personal dosimeter for collecting an integrated dose value separately from the personal dosimeter 20 carried by the worker 30.
In particular, when collecting an integrated dose value at a high working dose rate, the worker 30 installs a personal dosimeter for collection at the work site and collects the personal dosimeter for collection after a lapse of a specified time. When the worker 30 uses the personal dosimeter 20 with the control number when performing the area leaving process in the entrance / exit area management device 10, a measure not to count the integrated dose value of the worker 30 is performed. With the above operation, the time during which the worker 30 stays at the work site with a high working dose rate can be suppressed to the shortest time, so that the integrated dose value to which the worker 30 incurs itself can be reduced.

Next, the ID number of the worker who collects the integrated dose value is registered in advance, and only the integrated dose value of the personal dosimeter 20 carried by the worker of the registered ID number is adopted. A method for performing the above will be described.

The radiation manager sets the ID number of the worker 30 as the worker who collects the integrated dose value in the entrance / exit area management device 10 before the worker 30 performs the leaving processing. I
The D number is stored in the storage unit 3a of the entry / exit area management device 10. By setting the ID number, the personal dosimeter 20 carried by the worker 30 can be defined as a personal dosimeter for collecting an integrated dose value. With the above operation, the conditions for collecting the integrated dose value can be limited, so that the reliability of the work dose rate can be improved.

[0048]

According to the exposure management system of the first aspect, in the entry processing, the worker can confirm the integrated dose value expected to be received by the worker before going to the actual work site. When the work plan work time and the work plan dose value are small, countermeasures can be taken in advance such as changing the setting of the work plan work time and the work plan dose value and changing the inclination of the work.

According to the exposure management system of the second aspect, in the leaving area processing, the entrance / exit area management device reads the integrated dose value from the personal dose measuring device carried by the worker,
Since the work dose rate is calculated from the integrated dose value and the time during which the worker stayed in the management area, the work dose rate that is the latest and close to the actual work situation at the work site can be obtained.

According to the exposure management system of the third aspect, in addition to the same effects as those of the second aspect,
By setting the effective time of the work dose rate in advance,
Since only the working dose rate collected during the effective time is adopted,
The latest work dose rate at the work site can be obtained.

According to the exposure management system of the fourth aspect, in addition to the same effects as those of the second aspect,
By setting the upper limit of the work dose rate in advance, only the work dose rate less than the upper limit is adopted, eliminating the effects of abnormally high work dose rate recorded due to failure of personal dosimeter. can do.

According to the exposure management system of the fifth aspect, in addition to the same effects as those of the second aspect,
By registering the management number of the personal dosimeter used for collecting the integrated dose value in advance, only the integrated dose value of the registered personal dosimeter is adopted. In particular, when collecting an integrated dose value at a high working dose rate, a worker installs a personal dosimeter for collection at the work site and collects the personal dosimeter for collection after a specified time has elapsed. Since the operation dose rate data is collected by the above operation, the time during which the worker stays at the work site with a high working dose rate can be suppressed to the shortest time, so that the integrated dose value received by the worker can be reduced.

According to the radiation exposure management system of the sixth aspect, in addition to the same effects as those of the second aspect,
By registering the ID number of the worker who collects the integrated dose value in advance, only the integrated dose value of the personal dosimeter carried by the worker of the registered ID number is adopted. For this reason, it is possible to limit the variation in the conditions for collecting the integrated dose value, and it is possible to improve the reliability of the work dose rate.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of an exposure management system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a screen displaying a situation in which an integrated dose value expected to be received by a worker increases in an environment of a high work dose rate Rh, a medium work dose rate Rm, and a low work dose rate Rl. It is.

FIG. 3 is a graph showing integrated dose value data stored in a storage unit of the personal dosimeter;

FIG. 4 is a graph in which the integrated dose value of FIG. 3 is approximated by one work dose rate and travel time.

FIG. 5 is a diagram illustrating a correlation between an entry time and an exit time of an operator and an effective time of a work dose rate.

[Explanation of symbols]

 1a, 1b Control unit 3a, 3b Storage unit 4a, 4b Reading unit 5a, 5b Key input unit 6a, 6b Display unit 9b Radiation detection unit 10 Entry / exit area management device 17 ID card reading unit 18 Integrated dose value calculation unit 19 Working dose Rate calculation means 20 Personal dosimeter 30 Worker 40 Control area 50 Work site

Claims (6)

[Claims] 1. An exposure management system comprising a personal dosimeter and an access control device, wherein the personal dosimeter includes a radiation detecting means for detecting radiation, an ID number of an operator, and an operation plan. A storage unit for storing a work time and a work plan dose value, a reading unit for communicating with the access control device, and a display unit for outputting an integrated dose value; A storage unit for storing the work dose rate of, a reading unit for communicating with the personal dosimeter,
A display unit for outputting an integrated dose value expected to be received by the worker; and an ID card reading unit for reading an ID card carried by the worker. Read the work plan work time and work plan dose value of the worker from the dosimeter, input the work dose rate of the work site from the storage unit, the integrated dose value that the worker is expected to suffer at the work site An exposure management system, which calculates and outputs the calculated result to the display unit. 2. An exposure management system comprising a personal dosimeter and an access control device, wherein the personal dosimeter includes a radiation detecting means for detecting radiation, an ID number of a worker, and a work plan. A storage unit for storing a work time and a work plan dose value, a reading unit for communicating with the entrance / exit area management device, and a display unit for outputting an integrated dose value; A storage unit that stores a working dose rate, and a reading unit that communicates with the personal dosimeter,
A display unit for outputting an integrated dose actually received by the worker, an ID card reading unit for reading an ID card carried by the worker, and an integrated dose value input from the personal dosimeter to calculate a work dose rate The work dose rate calculation means reads the integrated dose value from the personal dosimeter carried by the worker in the departure processing, and calculates the integrated dose value and the worker. An exposure management system that calculates a work dose rate from a time during which the user stays in the management area and stores the calculated work dose rate in the storage unit. 3. The exposure management system according to claim 2, wherein the working dose rate calculating means sets an effective time of the working dose rate in advance, and adopts only the working dose rate collected during the effective time. 4. The exposure management system according to claim 2, wherein the working dose rate calculating means sets an upper limit value of the working dose rate in advance, and adopts only the working dose rate less than the upper limit value. 5. The work dose rate calculating means registers in advance the management number of the personal dosimeter used for collecting the integrated dose value, and adopts only the integrated dose value of the registered personal dosimeter. Item 2. An exposure management system according to Item 2. 6. The work dose rate calculating means registers an ID number of a worker who collects an integrated dose value in advance, and registers a personal dose measuring device carried by the worker having the registered ID number. The exposure management system according to claim 2, wherein only the integrated dose value is adopted.