JPS60120295A - Radiation control system - 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 [Field of Application of the Invention] The present invention relates to a management system that can quickly and accurately process planning and instructions for radiation work within a radiation controlled area of a nuclear power generation facility.

[Background of the invention]

Conventionally, in nuclear power facilities, the area affected by radiation is designated as a controlled area, and in order to control the radiation dose received by workers who enter the contamination area of the area, equipment as shown in Figure 1 is installed. is widely applied. Furthermore, for work within controlled areas, a radiation work permit system as shown in Figures 1 and 2 is in place from the perspective of reducing radiation exposure to workers.

This is based on the work plan submitted by the work contractor.
The equipment manager issues a radiation work permit for a work plan that is judged to be appropriate after reviewing the contents. Conventionally, the series of procedures associated with such operations have been completed with the necessary information in a formalized document. Radiation managers who are familiar with the equipment in question filled out the documents and exchanged them.For this reason, for example, during regular inspections of nuclear power generation equipment, about 500 types of regular inspection work are performed, and the latest work site contamination information is checked. situation and work process,
Estimate the radiation exposure that workers will receive from performing the work based on past work performance records, etc.
Selection of workers to be engaged in the work, drafting of 9 work needles, and management of radiation work permits for this plan;
In addition, we will continue to review and evaluate work plans based on work performance data (approximately 1,500 pieces of data per day) that is recorded during the creation of radiation worker instructions, which is carried out every trip for about three months. Must be done. For this reason, the burden on radiation managers was heavy, and from the point of view of single-person radiation exposure management, it was not always efficient.

In particular, during periodic inspections, the contamination status of the work area changes depending on the progress of the equipment inspection, and each time the work is performed, the number of personnel involved and the work schedule must be reviewed. For this reason, the burden on radiation managers is increasing, and they are unable to quickly respond to work plans and instructions, such as giving work instructions for individual tasks and reviewing the number of workers in accordance with the liquefaction of the on-site contamination situation. I had a lot of problems.

[Purpose of the invention]

An object of the present invention is to provide a management system related to radiation work that organizes various information related to radiation exposure, stores radiation exposure results statistically.

[Overview of the invention]

The feature of the present invention is to predict and calculate the amount of radiation exposure due to the work in multiple work areas within the radiation control area, and calculate the radiation exposure amount when performing the work based on the predicted value and the past we amount of the worker registered in advance. The purpose of this system is to allocate work in sequence so that the amount of radiation exposure falls below a predetermined limit value, and to create a work plan for the area.

More specifically, by automating a series of document preparation procedures related to work in radiation areas and quickly and accurately providing information for planning and instructing radiation work, the burden on radiation managers will be reduced and radiation exposure will be reduced. Management 1. To provide a radiation work management system that can formulate work plans and give instructions that are efficient from the point of view of personnel management.

[Embodiments of the invention]

The present invention will be explained below by way of an example.

First, a radiation work management device according to the present invention will be schematically explained. In Fig. 3, 1 to 7 indicate the external 3J boundaries of the radiation work management device 8, where 1 is the reactor building and 2
indicates the turbine building, where the main equipment of the power generation equipment is installed, and areas affected by radiation are designated as controlled areas, where radiation monitors 6 are installed to detect contamination conditions and to monitor detailed contamination conditions at each work site. A data registration device 4 for input is installed. In addition, access to these buildings is strictly controlled at checkpoint 3, and no damage is caused by entry.
The dose is measured by an on-site exposure dose measuring device 5. and the status of these exposures and contamination.

Personal registration information (name, expiration date, work qualification code for 2 departments, etc.) that identifies workers who enter and leave the controlled area is all managed by the radiation exposure record data collection device 7.

The radiation work management device 8 receives performance information on radiation exposure and contamination status from the above-mentioned device, and personal registration information of workers 1, and mechanizes and operates a series of procedures for work to be carried out within the radiation controlled area. In addition to speeding up the
This is a device that predicts the radiation exposure dose at a work site from a radiation management perspective and prevents abnormal radiation exposure by selecting appropriate workers.

This apparatus is composed of the components shown in 9 to 16 shown in FIG.

First, all work under radiation control must be done in advance with CB, T1
4. Using the keyboard 15, work place.

Work subject 1 Enter information necessary for the work plan, such as work period. This information is checked by the information search circuit 12 to see if there is a past work record and whether a designated work place exists within the equipment, and then only valid designation information is sent to the data processing circuit 10. The data processing circuit 10 has the central function of the apparatus, which is to formulate a work plan and issue instructions based on the transmitted designation information. The data processing circuit 10 takes in the latest on-site contamination situation for the transmitted work place via the performance input circuit 9, and calculates the change in the contamination situation for the designated work place. A work exposure dose prediction circuit 10b that estimates the radiation dose related to the work based on the past work results of the subject, and a worker selection circuit 10C that selects workers based on the predicted value.
It consists of 1. The predicted exposure dose 1 worker determined by this data processing circuit 10 is stored in the work data storage circuit 11.
At the same time, it is sent to the form editing circuit 13 and output to the printer 16 as a work plan based on a predetermined format. Similarly, for radiation work permit 1 work instructions, by inputting work location 2 subject name from CRT 14 and keyboard 15, necessary information is retrieved by form editing circuit 13 and output to printer 16. It has become so.

The present invention takes into account the past radiation exposure record and the latest work site contamination status, the secular changes in the radiation environment at the work place, and the past radiation exposure record for the same work, and calculates the planned dose for the daily rate υ of the work to be performed. The aim is to predict the overall intoxication exposure dose and, based on this, to select workers based on various evaluation factors, improve the accuracy of work plans, and respond quickly.

This work plan prediction will be explained in detail below.

First, when making a work plan, specify the specific location where the work will be carried out and the work title using the following method, and include the latest contamination status and past pollution record of the work place. Figure 4 shows the third
This is a specific example of the keyboard 15 attached to the information retrieval CB T14 shown in the figure. This keyboard consists of an interrupt key to which functions that can be provided by the radiation work management device are assigned, and a character entry key for adding the work location 1 work subject, etc. For example, "work plan" 4
When the interrupt key No. 1 is pressed, a screen as shown in FIG. 5 is displayed on CR, T corresponding to the operated keyboard. Then, use the character input keys to input the work subject of work location 2 as shown in Fig. 5, 51 to 53, and press the control key.The manpower information on the 081 screen will be
The information is sent via the information retrieval circuit 12 shown in the figure to the radiation environment aging change calculation circuit lOa and processed as follows.

That is, first, using the work title of work place 1, the work data storage circuit 11 retrieves the management information related to the work place. This management information is fixedly determined in advance depending on the scale of the facility and the location of the equipment, and is stored in the work data storage circuit 11 in advance. - To explain an example, for example, the work plan in Figure 5 shows the work area on the 6th floor of the reactor building shown in Figure 3, but the horizontal cross-sectional view A-A' of this building is shown in Figure 6. It will be something like this. In these areas, radiation monitors 61 are installed around the main equipment to constantly measure the contamination status. In addition, in order to periodically grasp the contamination situation in more detail, there is a survey point 62 where measurement points are determined, and radiation managers measure the contamination situation regularly, register the data, and record the radiation exposure results through the device 4. The data collection device 7 is operated manually. Assuming that the work title is "hetai work", the management information indicating the contamination status of the work place can be set as the ranges 61a to 61d and 62a to 62e indicated by broken lines in FIG. 6, so that the actual results of the contamination status can be collected. .

The management information corresponding to the work subject of work place 2 is retrieved from the memory having the configuration as specified in 71 of Figure 7,
The identification code is sent to the performance input circuit 9. Performance input circuit 9
Now, the latest contamination record data managed by the exposure record data collection device 7 and data corresponding to the identification code are collected and sent to the aging change calculation circuit 10a. This information is transferred to the area showing the current value of the management information issued earlier *b, and based on the contamination record at the end of the previous work, the average value and secular change of the contamination status related to the radiation environment can be calculated using the following formula. Depends on it.

(1) A V E 1 = ΣContamination record data at the end of the previous work (61a+6 l b・=+62 d+62e)
/Measurement point (2) A V E 2 = Σ Latest contamination record data (6
1a16 l b-+62 d+626 )/Measurement point (3) Change over time <(1)=kV E 2/AV E 1
The average value and aging change (α) of the contamination status are sent to the information retrieval circuit 12, and displayed on the CRT that previously requested the work plan as the radiation environment of the work site for the work subject of the work location 9.
This is particularly displayed as shown in FIG. 554.

Next, the work evaluation coefficient 1 for the work scheduled this time
C) Manually calculate the number of personnel expected to be employed for one working period using the LT 14 and keyboard 15 in the same manner as described above. This information is sent to the work exposure dose prediction circuit 10b together with the previously determined secular change (α) of the radiation environment at the work place.

Therefore, the radiation exposure record at the end of the previous work is retrieved from the memory having the configuration as shown in FIG.

Expected total exposure dose = Drunken exposure dose result from previous work For example, when there is additional work to the current work and the work cannot be performed using the same procedure as the previous work, specify the degree of influence that the additional work will have on the overall work, and identify factors that cannot be estimated simply from changes in contamination over time. There is something that corrects 4111i.

Then-C1 The predicted total radiation exposure dose related to the work is sent to the worker selection circuit 10C, and the predicted line exposure dose is calculated based on the 1112 work period and the number of personnel scheduled to be employed during finger-toe work. The selection of workers will be made within the scope of the above and who can strictly adhere to the management standards stipulated in the Radiation Hazard Prevention Act.

FIG. 8 shows an example of a processing flow in which the worker selection circuit 10C is realized by applying a computer, and the processing is performed as follows.

First, in step 80a, the selection of workers is performed by selecting workers who can engage in the work through the performance input circuit 9, and extracting personal registration information of the workers managed by the radiation exposure data collection device 7. do.

This is done by predetermining a work qualification code for the work subject, who can be engaged in the work, and sending this work qualification code to the performance input circuit 9. This can be realized by extracting workers who are not engaged in the work (sob).

Next, based on the latest contamination status of the work place and the designated work time, the work plan line f, which is expected to be exposed to radiation when each worker works at the work place for the specified time, is first calculated by the aging change calculation circuit. It is determined by the following formula using the latest contamination performance data average value (AVE2) determined in 10a.

Planned work dose = AvE2x Human body effect coefficient You can do it like this.

(Average contamination results at the end of the previous work) In other words, the impact on the human body is determined based on the ratio of the radiation dose received by workers per unit time during the previous work and the actual contamination status at the site (80c). ).

Next, calculate the planned work dose for the expected pseudo-dose exposure using the following formula using the specified work period and the number of personnel scheduled to be employed.

Planned work dose = Expected - Exposure dose / (Work period It shows. Therefore, if the planned work dose based on the on-site contamination record data set in advance is less than the work planned dose calculated from the expected exposure dose, even if all the personnel are engaged in the work for the specified work period, the total exposure line t will not be achieved. It can be determined that the amount will not be exceeded (80d).

Next, this planned dose is compared and verified to see if it satisfies the management standards set by laws and regulations or the facility manager. Generally applied management standards are 1 day, 1 week, and 3 months, and exposure exceeding these standards is restricted. Therefore, depending on the work period of the work, for example, for a work period of one month, apply the control standard value of Excess 9 and compare and check whether the planned dose satisfies the weekly control dose80e) , if it exceeds,
Adjust the working time to be shorter (80f) to calculate the convergence of the planned dose so that it is below the control dose, and determine the working time and planned dose. The working time is adjusted according to the following formula.

Work plan dose = AVE 2 x human body effect coefficient x work time By reducing the work time using this formula, the work plan dose can be brought closer to the management standard value.

If the planned dose is brought closer to the control standard by reducing work hours, the number of work hours will be affected. This is corrected using the following formula.

Additional personnel input = Reduced work time , is added to the past exposure of the previously extracted persons who can engage in the work (sog). The workers whose exposure dose is lowest compared to the exposure dose of those who can engage in the work determined in this way are extracted in order of the number of people to be employed, and are set as the workers for the work (80h).

The information regarding radiation exposure and workers for the work plan thus determined is transferred to the work data storage circuit 11 and also to the form editing circuit 13, where the form is edited as shown in FIG. 9, and sent to the printer 16. Output.

The work results for this work plan are calculated on a daily basis.
The radiation exposure record data collection device 7, in which the radiation exposure is summarized on the work subject side, is transferred via the record input circuit 9 to the area showing the record values of the work data storage circuit 11, and the data from the previous work is stored every year. Replaced with actual results.

As described above, the present invention enables work plans for radiation work to be drawn up based on past radiation exposure records and the current on-site contamination situation. Planning can be done quickly and unified work plan management that does not depend on individual radiation managers is possible.

〔Effect of the invention〕

According to the present invention, it is possible to create an appropriate radiation management system based on past radiation doses and predicted radiation doses.

[Brief explanation of the drawing]

Figure 1 shows the overall configuration of the device, which mainly records the radiation exposure records of individual workers, and Figure 2 shows the flow of procedures in work management.
Figure 3 is the overall configuration diagram, Figure 4 is the keyboard, and Figure 5 is C.
Example of RT display, Fig. 6 is an example of a radiation monitor in a work area and periodic survey points, Fig. 7 is an information storage area for work place and work subject, Fig. 8 is a flowchart showing a worker selection method, Fig. 9 The figure shows an example of a form. 8... Radiation control device, 9... Performance input circuit, 1o
...Data processing circuit, 12...Information retrieval circuit. Agent Patent Attorney Akio Takahashi Figure 1 Figure 1 Figure 5 Figure 6' Figure 7 Kaya Figure Y9

Claims (1)

[Claims] 1. In a radiation management system for work in radiation-controlled areas such as nuclear power generation facilities, the amount of radiation exposure due to work in multiple work areas is predicted, and the predicted value and the past exposure amount of multiple workers registered in advance are calculated. The radiation management system is implemented by predicting the cumulative radiation exposure of multiple workers when each worker performs the work, and sequentially assigning the work so that the cumulative radiation exposure is below a predetermined limit value. A radiation management system characterized by creating a work plan within an area.