A method and system for controlling working dose limits of nuclear power plant personnel

Abstract

The present invention belongs to the field of nuclear power plant radiation safety technology, specifically relating to a method and system for controlling the working dose limits of nuclear power plant personnel. The system includes a radiation protection authorization management system, a radiation work permit application system, a radiation work permit management system, and a personal dose management system database. The radiation protection authorization management system controls the authorization of radioactive personnel, automatically matching personnel based on their information to ensure that all qualified personnel obtain radiation protection authorization. The radiation work permit application system manages the permitting of radioactive work. The radiation work permit management system collects all data from the radiation protection authorization management system and the radiation work permit application system. The personal dose management system database stores information such as personnel entry and exit records and radiation dose received during each radioactive work session. This invention addresses the technical problem in existing control methods where personnel radiation doses may exceed nationally prescribed limits.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power plant radiation safety, and in particular relates to a method and system for controlling the working dose limit of nuclear power plant personnel. Background Art

[0002] All personnel performing radiation-related work at nuclear power plants are required to wear personal electronic dosimeters to monitor their radiation exposure. Nuclear power plants manage radiation protection authorization, radiation work permit processing, and personnel dose data collection for radiation workers through plant-level radiation protection training, a radiation work permit management system, and a personal dose management system. According to relevant national laws and regulations, the annual average effective dose for radiation workers must not exceed 20 mSv for five consecutive years, and the effective dose in any given year must not exceed 50 mSv. Currently, nuclear power plants use the personal dose management system to write the dose limits set by the radiation work permit management system into the personal electronic dosimeters worn by workers. When a worker's exposure exceeds the set dose limit, the meter will sound an audible and visual alarm to notify the worker. This method can control the exposure dose of individual workers, but it has limitations in controlling the annual exposure dose of workers: even if the exposure dose for a worker's individual work does not exceed the limit, the worker's cumulative annual dose may exceed the prescribed limit.

[0003] Therefore, it is necessary to provide a method and system for controlling the working dose limit of nuclear power plant personnel to address the deficiencies in the existing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for controlling the working dose limit of nuclear power plant personnel, which is a personal dose limit control method that takes into account the allowable dose limit of a single working day, the allowable dose limit of work, and the annual dose limit of personnel, so as to ensure that the annual exposure dose of radioactive workers meets the corresponding management and control requirements, and is used to solve the technical problem that the exposure dose of workers in existing control methods may exceed the national limit.

[0005] The technical solution for achieving the purpose of the present invention is as follows:

[0006] A method for controlling a work dose limit for personnel in a nuclear power plant, the method comprising the following steps:

[0007] Step 1: Enter radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions into the system through the radiation protection authorization management system input terminal;

[0008] Step 2: The system matches the input radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions with personnel information and automatically generates a list of authorized personnel;

[0009] Step 3: In the radiation work permit application system, retrieve the list of personnel engaged in radioactive work from the radiation protection authorization management system and calculate the allowable dose control limit D for each individual work day. d and personnel single work allowable dose control limit WD A ;

[0010] Step 4: Import the radiation work permit application system information into the radiation work permit management system;

[0011] Step 5: Import the radiation protection authorization management system and radiation work permit management system information into the personal dose management system database;

[0012] Step 6: Perform logical calculation of personal dose control limit when staff start personal electronic dose meter;

[0013] Step 7: On the personal dose meter starter device, enter the radiation control area pass number and radiation work permit number of the personnel radiation protection authorization, and write the logically calculated personal dose control limit into the activated personal electronic dosimeter;

[0014] Step 8: When workers are engaged in radioactive work, personal electronic dosimeters record the exposure doses received by the workers.

[0015] The allowable dose control limit D for a single working day of personnel in step 3 is d , Personnel single work allowable dose control limit WD A The calculation method is as follows:

[0016] D i =R×t i

[0017] D d =max(D i )

[0018] WD A =∑D i

[0019] Among them, D i is the estimated radiation dose received by personnel on the i-th day, in mSv; R is the radiation level at the work site, t i is the working time on day i, D d WD is the permissible dose control limit for a single workday for personnel, in mSv; A It is the allowable dose control limit for a single job of personnel, in mSv.

[0020] Described step 6 comprises the following sub-steps:

[0021] Step 6.1: Calculate the percentage f1 of the cumulative daily dose received by personnel in a single work item as a percentage of the daily allowable dose control limit, the percentage f2 of the cumulative daily dose received by personnel in a single work item as a percentage of the work allowable dose control limit, and the percentage f3 of the cumulative annual dose received by personnel in the nuclear power plant as a percentage of the annual dose management limit;

[0022] Step 6.2: When the percentage of the personnel’s single workday cumulative exposure dose to the daily allowable dose control limit f1, the personnel’s single work cumulative exposure dose to the work allowable dose control limit f2, and the personnel’s annual cumulative exposure dose to the annual dose management limit f3 are all less than 80%, start the personal electronic dose meter and take the personal dose control limit D d -d d WD A -d A 、D y -d y The minimum value of

[0023] Step 6.3: When one or more of the following percentages (f1) of the personnel’s daily cumulative dose in a single work item to the daily allowable dose control limit, f2 of the personnel’s cumulative dose in a single work item to the work allowable dose control limit, and f3 of the personnel’s annual cumulative dose in the nuclear power plant to the annual dose management limit are greater than 80% but all are less than 100%, start the personal electronic dose meter and take the personal dose control limit value D d -d d WD A -d A 、D y -d y The minimum value of the dosimeter is reached, and the staff will hear an audible and visual alarm after starting the electronic dosimeter;

[0024] Step 6.4: When one or more of the following values is greater than 100%: the percentage f1 of the cumulative daily dose received by a person in a single work item, the percentage f2 of the cumulative dose received by a person in a single work item, and the percentage f3 of the cumulative annual dose received by a person in a nuclear power plant, it is not allowed to start the personal electronic dosimeter.

[0025] The calculation method for calculating the percentage f1 of the cumulative daily dose received by personnel in a single work item as a percentage of the daily allowable dose control limit, f2 of the cumulative dose received by personnel in a single work item as a percentage of the work allowable dose control limit, and f3 of the cumulative annual dose received by personnel in the nuclear power plant as a percentage of the annual dose management limit in step 6.1 is as follows:

[0026] f1=d d / D d

[0027] f2=dA / WD A

[0028] f3=d y / D y

[0029] Among them, f1 is the percentage of the cumulative exposure dose of a person in a single work day to the daily allowable dose control limit, f2 is the percentage of the cumulative exposure dose of a person in a single work to the allowable work dose control limit, f3 is the percentage of the cumulative exposure dose of a person in a nuclear power plant to the annual dose management limit, d d D is the cumulative radiation dose received by personnel in a single working day. d The limit of the dose allowed for a single working day for personnel; d A WD is the cumulative radiation dose received by personnel in a single task. A The permissible dose control limit for a single job; d y D is the annual cumulative exposure dose received by personnel in nuclear power plants, y It is the annual dose management limit for personnel.

[0030] The annual dose management limit for personnel D y The range is 12mSv~20mSv.

[0031] Described step 8 comprises the following sub-steps:

[0032] Step 8.1: When the exposure dose exceeds 80% of the internal control limit of the personal electronic dosimeter, the personal electronic dosimeter will sound an audible and visual alarm, and the radiation protection personnel will investigate and confirm the exposure dose;

[0033] Step 8.2: After the work is completed, the entry time, exit time, personnel exposure dose and other information recorded in the personal electronic dosimeter are transmitted to the personal dose management system database.

[0034] A nuclear power plant personnel work dose limit control system, the system includes a radiation protection authorization management system, a radiation work permit application system, a radiation work permit management system, and a personal dose management system database;

[0035] The radiation protection authorization management system controls the authorization of radioactive personnel. The system automatically matches personnel information and all qualified personnel obtain radiation protection authorization.

[0036] The radiation work permit application system manages the permitting of radioactive work;

[0037] The Radiation Work Permit Management System collects all data from the Radiation Protection Authorization Management System and the Radiation Work Permit Application System;

[0038] The personal dose management system database serves as a database of personnel's work exposure doses. It stores information such as the entry and exit records, exposure doses, etc. of each time a worker engages in radioactive work, and calculates and writes the personnel exposure dose limit each time the worker starts the personal electronic dose meter.

[0039] The radiation protection authorization management system controls the authorization of radioactive workers, mainly including radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions.

[0040] The radiation work permit application system manages the permitting of radioactive work, focusing on the review and approval of the limits on the radiation doses received by radioactive workers, wherein the dose limits mainly include the allowable dose for a single workday and the allowable dose for a single job.

[0041] The radiation work permit management system is linked and communicated with the personal dose management system database to achieve real-time data transmission.

[0042] The beneficial technical effects of the present invention are:

[0043] (1) The present invention realizes the linked operation of the radiation worker authorization management system, radiation work permit application system, radiation work permit management system, and personal dose management system database, significantly improving the big data management level of radiation personnel and work information;

[0044] (2) The present invention automatically matches and obtains data through the information system, reducing the risk of human error in staff operations and improving work efficiency;

[0045] (3) The present invention creates a calculation and logic for the personnel dose control limit when the personal electronic dosimeter is turned on, which can effectively control the personnel exposure dose and avoid the problem of personnel exposure dose exceeding the national prescribed limit;

[0046] (4) The present invention incorporates the personal annual dose management limit into the calculation of the dose limit when the personnel start the meter, making the setting of the personal dose control limit more reasonable, realizing the systematic management of the personal annual dose limit, avoiding the problem of personnel exceeding the national limit due to untimely manual calculation, and also reducing the risk of human error;

[0047] (5) This method realizes the conservative calculation of the dose control limit when the worker starts the personal electronic dosimeter during radioactive work, and issues an audible and visual alarm when the worker's exposure dose reaches 80% of the limit, effectively reminding the workers and radiation protection professionals to pay attention. When the personnel's single workday allowable dose, personnel's single work allowable dose, and personnel's annual dose management limit reach 80%, the audible and visual alarm will be issued after the personal electronic dosimeter is activated, which has an early warning function. At the same time, when the personnel's single workday allowable dose, personnel's single work allowable dose, and personnel's annual dose management limit reach 100%, the system automatically prohibits the activation of the personal electronic dosimeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a flow chart of a method for controlling the working dose limit of nuclear power plant personnel provided by the present invention; DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0050] like Figure 1 As shown, the present invention provides a method for controlling the working dose limit of nuclear power plant personnel, which includes the following steps:

[0051] Step 1: Enter the radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions into the system through the radiation protection authorization management system input terminal.

[0052] Step 2: The system matches the input radiation protection training assessment results, internal exposure monitoring results, occupational medicine evaluation conclusions with personnel information, and automatically generates a list of authorized personnel.

[0053] Step 3: In the radiation work permit application system, the list of authorized radioactive personnel is retrieved from the radiation protection authorization management system. The work preparation personnel calculate the allowable dose control limit D for a single work day based on the radioactive work time window and the radiation level at the work site. d , Personnel single work allowable dose control limit WD A , the calculation method is as follows:

[0054] D i =R×t i

[0055] Dd =max(D i )

[0056] WD A =∑D i

[0057] Among them, D i is the estimated radiation dose received by personnel on the i-th day, in mSv; R is the radiation level at the work site, t i is the working time on day i, D d WD is the permissible dose control limit for a single workday for personnel, in mSv; A It is the allowable dose control limit for a single job of personnel, in mSv.

[0058] Step 4: Import the radiation work permit application system information into the radiation work permit management system.

[0059] Step 5: Import the radiation protection authorization management system and radiation work permit management system information into the personal dose management system database.

[0060] Step 6: The staff starts the personal electronic dose meter to perform logical calculation of the personal dose control limit.

[0061] Step 6.1: Calculate the percentage f1 of the cumulative daily dose received by personnel in a single work item as a percentage of the daily allowable dose control limit, the percentage f2 of the cumulative daily dose received by personnel in a single work item as a percentage of the allowable work dose control limit, and the percentage f3 of the cumulative annual dose received by personnel in the nuclear power plant as a percentage of the annual dose management limit:

[0062] f1=d d / D d

[0063] f2=d A / WD A

[0064] f3=d y / D y

[0065] Among them, f1 is the percentage of the cumulative exposure dose of a person in a single work day to the daily allowable dose control limit; f2 is the percentage of the cumulative exposure dose of a person in a single work to the allowable work dose control limit; f3 is the percentage of the cumulative exposure dose of a person in a nuclear power plant to the annual dose management limit; d d D is the cumulative radiation dose received by personnel in a single working day; d The permissible dose control limit for a single workday for personnel, in mSv; d A The unit of WD is the cumulative radiation dose received by personnel for a single task, mSv; AThe permissible dose control limit for a single job is mSv; d y The annual cumulative radiation dose received by personnel in nuclear power plants is in mSv; D y is the annual dose management limit for personnel, D y The range is 12mSv~20mSv.

[0066] Step 6.2: When the percentage of the personnel’s single workday cumulative exposure dose to the daily allowable dose control limit f1, the personnel’s single work cumulative exposure dose to the work allowable dose control limit f2, and the personnel’s annual cumulative exposure dose to the annual dose management limit f3 are all less than 80%, start the personal electronic dose meter and take the personal dose control limit D d -d d WD A -d A 、D y -d y The minimum value of .

[0067] Step 6.3: When one or more of the following percentages (f1) of the personnel’s daily cumulative dose in a single work item to the daily allowable dose control limit, f2 of the personnel’s cumulative dose in a single work item to the work allowable dose control limit, and f3 of the personnel’s annual cumulative dose in the nuclear power plant to the annual dose management limit are greater than 80% but all are less than 100%, start the personal electronic dose meter and take the personal dose control limit value D d -d d WD A -d A 、D y -d y The minimum value is reached, and the staff will sound and light alarms after starting the electronic dosimeter.

[0068] Step 6.4: When one or more of the following values is greater than 100%: the percentage f1 of the cumulative daily dose received by a person in a single work item, the percentage f2 of the cumulative dose received by a person in a single work item, and the percentage f3 of the cumulative annual dose received by a person in a nuclear power plant, it is not allowed to start the personal electronic dosimeter.

[0069] Step 7: On the personal electronic dosimeter activation device, the staff enters the radiation control area pass number and radiation work permit number for personnel radiation protection authorization, and the system writes the logically calculated personal dose control limit into the activated personal electronic dosimeter.

[0070] Step 8: When workers are engaged in radioactive work, personal electronic dosimeters record the exposure doses received by the workers.

[0071] Step 8.1: When a worker's exposure dose exceeds 80% of the control limit of the personal electronic dosimeter, the personal electronic dosimeter will sound an audible and visual alarm. Radiation protection personnel will investigate and confirm the exposure dose.

[0072] Step 8.2: After the staff finishes their work, the entry time, exit time, personnel exposure dose and other information recorded in the personal electronic dosimeter will be transmitted to the personal dose management system database.

[0073] The present invention also provides a nuclear power plant personnel work dose limit control system, which includes a radiation protection authorization management system, a radiation work permit application system, a radiation work permit management system, and a personal dose management system database.

[0074] The radiation protection authorization management system controls the authorization of radioactive workers, mainly including radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions, which are entered into the radiation protection authorization management system through the data port. The system automatically matches according to personnel information, and all qualified personnel obtain radiation protection authorization.

[0075] The Radiation Work Permit Application System manages the licensing of radioactive work, focusing on the review and approval of dose limits for radioactive workers. These dose limits primarily include the allowable dose per person per workday and the allowable dose per person per task.

[0076] All data from the radiation protection authorization management system and the radiation work permit application system are entered into the radiation work permit management system. At the same time, the system is linked and interconnected with the personal dose management system database to realize real-time data transmission.

[0077] The personal dose management system database serves as a database of personnel's work exposure doses. It stores information such as the entry and exit records, exposure doses, etc. of each time a worker engages in radioactive work, and calculates and writes the personnel exposure dose limit each time the worker starts the personal electronic dose meter.

[0078] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A method for controlling the working dose limit of nuclear power plant personnel, characterized by: The method comprises the following steps: Step 1: Enter radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions into the system through the radiation protection authorization management system input terminal; Step 2: The system matches the input radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions with personnel information and automatically generates a list of authorized personnel; Step 3: In the radiation work permit application system, retrieve the list of personnel engaged in radioactive work from the radiation protection authorization management system and calculate the allowable dose control limit D for each individual work day. d and personnel single work allowable dose control limit WD A ; Step 4: Import the radiation work permit application system information into the radiation work permit management system; Step 5: Import the radiation protection authorization management system and radiation work permit management system information into the personal dose management system database; Step 6: Perform logical calculation of personal dose control limit when staff start personal electronic dose meter; Step 7: On the personal dose meter starter device, enter the radiation control area pass number and radiation work permit number of the personnel radiation protection authorization, and write the logically calculated personal dose control limit into the activated personal electronic dosimeter; Step 8: When workers are engaged in radioactive work, personal electronic dosimeters record the exposure doses received by the workers; Step 6 includes the following sub-steps: Step 6.1: Calculate the percentage f1 of the cumulative daily dose received by personnel in a single work item as a percentage of the daily allowable dose control limit, the percentage f2 of the cumulative daily dose received by personnel in a single work item as a percentage of the work allowable dose control limit, and the percentage f3 of the cumulative annual dose received by personnel in the nuclear power plant as a percentage of the annual dose management limit; f1=d d / D d f2=d A / WD A <h2 style=";text-align:left;direction:ltr">f3=d<h2 style=";text-align:left;direction:ltr"> y <h2 style=";text-align:left;direction:ltr"> / D<h2 style=";text-align:left;direction:ltr"> y Among them, f1 is the percentage of the cumulative exposure dose of a person in a single work day to the daily allowable dose control limit, f2 is the percentage of the cumulative exposure dose of a person in a single work to the allowable work dose control limit, f3 is the percentage of the cumulative exposure dose of a person in a nuclear power plant to the annual dose management limit, d d D is the cumulative radiation dose received by personnel in a single working day. d The limit of the dose allowed for a single working day for personnel; d A WD is the cumulative radiation dose received by personnel in a single task. A The permissible dose control limit for a single job; d y D is the annual cumulative exposure dose received by personnel in nuclear power plants, y Annual dose management limits for personnel; Step 6.2: When the percentage of the personnel’s single workday cumulative exposure dose to the daily allowable dose control limit f1, the personnel’s single work cumulative exposure dose to the work allowable dose control limit f2, and the personnel’s annual cumulative exposure dose to the annual dose management limit f3 are all less than 80%, start the personal electronic dose meter and take the personal dose control limit D d -d d WD A -d A 、D y -d y The minimum value of Step 6.3: When one or more of the following percentages (f1) of the personnel’s daily cumulative dose in a single work item to the daily allowable dose control limit, f2 of the personnel’s cumulative dose in a single work item to the work allowable dose control limit, and f3 of the personnel’s annual cumulative dose in the nuclear power plant to the annual dose management limit are greater than 80% but all are less than 100%, start the personal electronic dose meter and take the personal dose control limit value D d -d d WD A -d A 、D y -d y The minimum value of the dosimeter is reached, and the staff will hear an audible and visual alarm after starting the electronic dosimeter; Step 6.4: When one or more of the following values is greater than 100%: the percentage f1 of the cumulative daily dose received by a person in a single work item, the percentage f2 of the cumulative dose received by a person in a single work item, and the percentage f3 of the cumulative annual dose received by a person in a nuclear power plant, it is not allowed to start the personal electronic dosimeter.

2. A method for controlling the working dose limit of nuclear power plant personnel according to claim 1, characterized in that: The allowable dose control limit D for a single working day of personnel in step 3 is d , Personnel single work allowable dose control limit WD A The calculation method is as follows: D i =R×t i D d =max(D i ) WD A =∑D i Among them, D i is the estimated radiation dose received by personnel on the i-th day, in mSv; R is the radiation level at the work site, t i is the working time on day i, D d WD is the permissible dose control limit for a single workday for personnel, in mSv; A It is the allowable dose control limit for a single job of personnel, in mSv.

3. A method for controlling the working dose limit of nuclear power plant personnel according to claim 2, characterized in that: The annual dose management limit for personnel D y The range is 12mSv~20mSv.

4. A method for controlling the working dose limit of nuclear power plant personnel according to claim 3, characterized in that: Described step 8 comprises the following sub-steps: Step 8.1: When the exposure dose exceeds 80% of the internal control limit of the personal electronic dosimeter, the personal electronic dosimeter will sound an audible and visual alarm, and the radiation protection personnel will investigate and confirm the exposure dose; Step 8.2: After the work is completed, the entry time, exit time, and personnel exposure dose information recorded in the personal electronic dosimeter are transmitted to the personal dose management system database.

5. The control system used in the method for controlling the working dose limit of nuclear power plant personnel according to claim 1 is characterized in that: The system includes radiation protection authorization management system, radiation work permit application system, radiation work permit management system, and personal dose management system database; The radiation protection authorization management system controls the authorization of radioactive personnel. The system automatically matches personnel information and all qualified personnel obtain radiation protection authorization. The radiation work permit application system manages the permitting of radioactive work; The Radiation Work Permit Management System collects all data from the Radiation Protection Authorization Management System and the Radiation Work Permit Application System; The personal dose management system database serves as a database of personnel work exposure doses. It stores the entry and exit records and exposure dose information of each time a worker engages in radioactive work, and calculates and writes the personnel exposure dose limit each time the worker starts the personal electronic dose meter.

6. The control system used in the method for controlling the working dose limit of nuclear power plant personnel according to claim 5 is characterized in that: The radiation protection authorization management system controls the authorization of radioactive workers, mainly including radiation protection training assessment results, internal exposure monitoring results, and occupational medicine evaluation conclusions.

7. The control system used in the method for controlling the working dose limit of nuclear power plant personnel according to claim 6 is characterized in that: The radiation work permit application system manages the permitting of radioactive work, focusing on the review and approval of the limits on the radiation doses received by radioactive workers, wherein the dose limits mainly include the allowable dose for a single workday and the allowable dose for a single job.

8. The control system used in the method for controlling the working dose limit of nuclear power plant personnel according to claim 7 is characterized in that: The radiation work permit management system is linked and communicated with the personal dose management system database to achieve real-time data transmission.

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