CN112488460B - Method for estimating total fission times of uranium dioxide in emergency of critical accident - Google Patents

Method for estimating total fission times of uranium dioxide in emergency of critical accident Download PDF

Info

Publication number
CN112488460B
CN112488460B CN202011267819.6A CN202011267819A CN112488460B CN 112488460 B CN112488460 B CN 112488460B CN 202011267819 A CN202011267819 A CN 202011267819A CN 112488460 B CN112488460 B CN 112488460B
Authority
CN
China
Prior art keywords
critical
uranium dioxide
estimating
accident
gamma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011267819.6A
Other languages
Chinese (zh)
Other versions
CN112488460A (en
Inventor
贾林胜
杨亚鹏
王任泽
冯宗洋
王宁
梁博宁
张建岗
李国强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Institute for Radiation Protection
Original Assignee
China Institute for Radiation Protection
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Institute for Radiation Protection filed Critical China Institute for Radiation Protection
Priority to CN202011267819.6A priority Critical patent/CN112488460B/en
Publication of CN112488460A publication Critical patent/CN112488460A/en
Application granted granted Critical
Publication of CN112488460B publication Critical patent/CN112488460B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0637—Strategic management or analysis, e.g. setting a goal or target of an organisation; Planning actions based on goals; Analysis or evaluation of effectiveness of goals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Landscapes

  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Human Resources & Organizations (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Entrepreneurship & Innovation (AREA)
  • Economics (AREA)
  • Strategic Management (AREA)
  • Theoretical Computer Science (AREA)
  • Educational Administration (AREA)
  • Mathematical Physics (AREA)
  • Operations Research (AREA)
  • Development Economics (AREA)
  • General Business, Economics & Management (AREA)
  • Game Theory and Decision Science (AREA)
  • Quality & Reliability (AREA)
  • Marketing (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Tourism & Hospitality (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Alarm Systems (AREA)

Abstract

The invention relates to a method for estimating total fission times in emergency of a uranium dioxide critical accident, which comprises the following steps: determining whether a critical accident occurs to a uranium dioxide system; (2) Determining whether the gamma critical alarm data can be obtained and the uranium dioxide is low in enrichment degree, and adopting a method recommended by NUREG-CR/6504; (3) If the gamma critical alarm data cannot be obtained or the uranium dioxide is not low in enrichment degree, adopting an RASCAL recommended method; (4) And (4) judging whether the critical is finished or not, if not, once the currently acquired critical information is updated, and then sequentially executing from the step (1) to estimate the critical fission times. The method provided by the invention is combined with the accident, and provides more accurate technical support for emergency decision makers.

Description

Method for estimating total fission times of uranium dioxide in emergency of critical accident
Technical Field
The invention belongs to the technical field of nuclear critical accident fission number estimation, and particularly relates to a total fission number estimation method in emergency of a uranium dioxide critical accident.
Background
The nuclear critical accident emergency evaluation technology is an important component of emergency preparation and response of nuclear fuel circulation facilities, and the emergency management of China also requires that facilities with potential nuclear critical accidents need to have the emergency evaluation capability of the accidents. The critical uranium dioxide accident is an accident which may occur in a post-treatment plant, and a corresponding emergency work needs to be done. The critical total fission number is an important content of the nuclear critical accident emergency evaluation and is one of the technical difficulties. The method reflects the size and scale of the nuclear critical accident and directly influences the accident emergency protection action decision.
When a critical accident occurs, the data acquired from the beginning is limited, and the acquired data is more and more abundant along with the lapse of time, so that the estimation of the total fission times is very necessary to be combined with the accident process, and a set of estimation method based on process information is established, thereby providing more powerful technical support for an emergency decision maker.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for estimating the total fission times of a uranium dioxide critical accident in emergency combined with an accident process, and provide more powerful technical support for emergency decision makers.
In order to achieve the above purposes, the invention adopts a technical scheme that: a method for estimating total fission times in emergency of a uranium dioxide critical accident, which is combined with an accident process, and comprises the following steps:
(1) Determining whether a critical accident occurs to the uranium dioxide system;
(2) If critical accidents happen, whether the readings of a critical gamma alarm instrument can be obtained or not is determined, and if the readings can be obtained and the uranium dioxide is low in enrichment degree, the U (5) O-based method in NUREG-CR/6504 is adopted 2 @H/ 235 An estimation method of a relation curve graph of gamma dose rate and time and distance under the U =200 scene;
(3) If the gamma critical alarm data cannot be obtained or the uranium dioxide is not low in enrichment degree, an RASCAL estimation method based on the system scene is adopted;
(4) And (4) judging whether the criticality is finished, if not, judging whether the currently acquired criticality information is updated, once the criticality information is updated, sequentially executing the step (1) and estimating the criticality fission times.
Further, the NUREG-CR/6504 in the step (2) is based on U (5) O 2 @H/ 235 The method for estimating the relation curve graph of the gamma dose rate and the time and the distance under the condition of U =200 comprises the following specific steps:
a) According to NUREG-CR/6504 based on U (5) O 2 @H/ 235 The relation graph of gamma dose rate and time and distance under the condition of U =200 establishes that the critical fission number of uranium dioxide is 10 17 A fitting formula of the gamma dose rate changing along with time and distance;
b) Estimating the fission number to be 10 according to the fitting formula 17 The gamma dose rates corresponding to the distances between the critical alarm instruments and the accident points at different times are different;
c) Calculating the total fission times of the actual critical accident, wherein the calculation formula is as follows:
Figure BDA0002776744800000021
in the formula:
D in fact -actual critical gamma alarm readings;
D estimating -an estimated gamma dose rate.
Further, the RASCAL system context-based estimation method in step (3) is as follows: when the uranium dioxide is in powder form, the number of first fissions is estimated to be 3X 10 20 Total number of fissions 3X 10 20 (ii) a When the uranium dioxide is massive uranium, the number of first fissions is estimated to be 3X 10 19 Total number of fissions 3X 10 19 。
The invention has the beneficial effects that: 1. the method is combined with the accident process, and a proper estimation method is selected according to different processes and obtained data, so that more accurate technical support is provided for emergency decision makers. 2. Establishing that the critical fission number of the uranium dioxide is 10 17 Therefore, the fitting formula of the gamma dose rate change along with time and distance is more convenient and accurate than the method for reading the dose rate from the curve graph in NUREG-CR/6504.
Drawings
Fig. 1 is a flowchart of a method for estimating total fission times in an emergency of a uranium dioxide critical accident according to the present invention;
FIG. 2 shows U (5) O given by NUREG/CR-6504 2 @H/ 235 Gamma dosage rate and time distance under U =200 sceneThe relationship of the separation.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of the method of the present invention, which includes the following steps:
step (1): and determining whether the critical accident happens to the uranium dioxide system. The gamma critical alarm instrument can set a threshold value, and when the reading exceeds the threshold value, an audible and visual alarm can be sent out to indicate that a critical accident occurs in the uranium dioxide system.
Step (2): if critical accidents happen, whether the readings of a critical gamma alarm instrument can be obtained or not is determined, and if the readings can be obtained and the uranium dioxide is low in enrichment degree, the U (5) O-based method in NUREG-CR/6504 is adopted 2 @H/ 235 The method for estimating the relation curve graph of the gamma dose rate and the time and the distance under the condition of U =200 comprises the following specific calculation steps:
a) Referring to FIG. 2, FIG. 2 shows U (5) O 2 @H/ 235 A graph of the relation between the gamma dose rate and the time distance under the condition that U =200 is established, and the critical fission number of uranium dioxide is 10 according to the graph shown in figure 2 17 A fitting formula of the gamma dose rate changing along with time and distance is shown in a table 1;
TABLE 1 fitting formula table of uranium dioxide gamma dose rate variation with time and distance
Figure BDA0002776744800000041
Wherein D-estimated dose rate, x-time
b) Estimating the fission number to be 10 according to the fitting formula 17 When the temperature of the water is higher than the set temperature,and the gamma dose rates correspond to the distances between the critical alarm instruments and the accident points at different times. For example, when the distance from the critical alarm gamma dose rate monitor to the accident point is 1.52m after the critical occurs for 10s, a fitting formula of D =280000/x is adopted 0.7068 Estimating the gamma dose rate;
c) Calculating the actual critical accident total fission number according to the estimated gamma dose rate and the actual critical gamma alarm reading, wherein the calculation formula is as follows:
Figure BDA0002776744800000042
in the formula:
D in fact -actual critical gamma alarm readings;
D estimating -an estimated gamma dose rate.
And (3): and if the gamma critical alarm data cannot be acquired or the uranium dioxide is not low in enrichment degree, adopting an RASCAL estimation method based on the system situation.
Typically, a critical alarm meter will alarm at the instant a critical event occurs, but data may not be acquired because the meter is clogged due to too high a dose, but the meter will display data tens of seconds or minutes after the critical event, which is related to the meter itself. When the critical gamma alarm reading cannot be obtained or the low enrichment condition is not met, a RASCAL scene-based estimation method is adopted, and the specific method is referred to table 2.
TABLE 2 fission times for different system scenarios
System context Number of first pulse fission Total number of fission
Powder of 3×10 20 3×10 20
Bulk uranium 3×10 19 3×10 19
And (4): and (3) judging whether the criticality is finished, if not, judging whether the currently acquired criticality information is updated, and if so, sequentially executing the step (1) to estimate the critical fission times.
It will be appreciated by persons skilled in the art that the apparatus and method of the present invention are not limited to the embodiments described in the detailed description, and the detailed description is for the purpose of explanation and not limitation of the invention. Other embodiments will be apparent to those skilled in the art from the following detailed description, which is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A method for estimating total fission times in emergency of a uranium dioxide critical accident, which is combined with an accident process, and comprises the following steps:
(1) Determining whether a critical accident occurs to the uranium dioxide system;
(2) If critical accidents happen, whether the readings of a critical gamma alarm can be obtained or not is determined, if the readings can be obtained and the uranium dioxide is low in enrichment degree, the U (5) O-based reading in NUREG-CR/6504 is adopted 2 @H/ 235 An estimation method of a relation curve graph of gamma dose rate and time and distance under the U =200 scene;
(3) If the gamma critical alarm data cannot be acquired or the uranium dioxide is not low in enrichment degree, an RASCAL estimation method based on the system scene is adopted;
(4) Judging whether the criticality is finished, if not, judging whether the currently acquired criticality information is updated, and if so, sequentially executing the steps from the step (1) to estimate the critical fission times;
the NUREG-CR/6504 is based on U (5) O 2 @H/ 235 The method for estimating the relation curve graph of the gamma dose rate and the time and the distance under the U =200 situation comprises the following specific steps:
a) According to NUREG-CR/6504 based on U (5) O 2 @H/ 235 The relation graph of gamma dose rate and time and distance under the condition of U =200 establishes that the critical fission number of uranium dioxide is 10 17 A fitting formula of the gamma dose rate changing along with time and distance;
b) Estimating the fission number to be 10 according to the fitting formula 17 The gamma dose rates corresponding to the distances between the critical alarm instruments and the accident points at different times are different;
c) Calculating the actual critical total fission times by the following formula:
Figure FDA0003781309930000011
in the formula:
D in fact -actual critical gamma alarm readings;
D estimating -estimated gamma dose rate.
2. The method for estimating the total fission times in the emergency of the uranium dioxide critical accident according to claim 1, wherein the RASCAL estimation method based on the system scenario is as follows: when the uranium dioxide is in powder form, the number of first fissions is estimated to be 3X 10 20 。
3. The method for estimating the total fission times during emergency of the uranium dioxide critical accident according to claim 1, wherein the estimation method of the RASCAL based on the system scenario is as follows: when the uranium dioxide is in powder form, the total number of fissions is estimated to be 3X 10 20 。
4. The method for estimating the total fission times in the emergency of the uranium dioxide critical accident according to claim 1, wherein the RASCAL estimation method based on the system scenario is as follows: when the uranium dioxide is bulk uranium, the number of first fissions is estimated to be 3X 10 19 。
5. The method for estimating the total fission times in the emergency of the uranium dioxide critical accident according to claim 1, wherein the RASCAL estimation method based on the system scenario is as follows: when the uranium dioxide is massive uranium, the total number of fissions is estimated to be 3X 10 19 。
CN202011267819.6A 2020-11-13 2020-11-13 Method for estimating total fission times of uranium dioxide in emergency of critical accident Active CN112488460B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011267819.6A CN112488460B (en) 2020-11-13 2020-11-13 Method for estimating total fission times of uranium dioxide in emergency of critical accident

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011267819.6A CN112488460B (en) 2020-11-13 2020-11-13 Method for estimating total fission times of uranium dioxide in emergency of critical accident

Publications (2)

Publication Number Publication Date
CN112488460A CN112488460A (en) 2021-03-12
CN112488460B true CN112488460B (en) 2022-11-15

Family

ID=74930839

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011267819.6A Active CN112488460B (en) 2020-11-13 2020-11-13 Method for estimating total fission times of uranium dioxide in emergency of critical accident

Country Status (1)

Country Link
CN (1) CN112488460B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102306508A (en) * 2011-09-07 2012-01-04 中国核动力研究设计院 Reactivity instrument for critical monitoring and critical extrapolation of reactor
JP2013003104A (en) * 2011-06-21 2013-01-07 Toshiba Corp Subcriticality measuring apparatus and subcriticality measuring method
CN109657905A (en) * 2018-11-12 2019-04-19 中国辐射防护研究院 A kind of evaluation method of the criticality accident Environment release source item of mox fuel
CN110390444A (en) * 2018-04-16 2019-10-29 中国辐射防护研究院 A kind of fcf UF6Accident leakage consequence assesses calculation method
CN111798643A (en) * 2020-05-25 2020-10-20 中国原子能科学研究院 Novel global critical accident alarm method and system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013003104A (en) * 2011-06-21 2013-01-07 Toshiba Corp Subcriticality measuring apparatus and subcriticality measuring method
CN102306508A (en) * 2011-09-07 2012-01-04 中国核动力研究设计院 Reactivity instrument for critical monitoring and critical extrapolation of reactor
CN110390444A (en) * 2018-04-16 2019-10-29 中国辐射防护研究院 A kind of fcf UF6Accident leakage consequence assesses calculation method
CN109657905A (en) * 2018-11-12 2019-04-19 中国辐射防护研究院 A kind of evaluation method of the criticality accident Environment release source item of mox fuel
CN111798643A (en) * 2020-05-25 2020-10-20 中国原子能科学研究院 Novel global critical accident alarm method and system

Also Published As

Publication number Publication date
CN112488460A (en) 2021-03-12

Similar Documents

Publication Publication Date Title
WO2020063819A1 (en) Real-time data analysis method for pipe network, and device
WO2021098021A1 (en) Data anomaly statistical alarm method and device, and electronic equipment
EP3293737B1 (en) Correlation tolerance limit setting system using repetitive cross-validation and method therefor
CN110739091A (en) nuclear power plant subcritical degree direct measurement system, hardware platform and measurement method
CN116522096B (en) Three-dimensional digital twin content intelligent manufacturing method based on motion capture
CN112488461B (en) Method for estimating total fission times in emergency of metal uranium critical accident
CN112488465B (en) Method for estimating total fission times of triuranium octoxide in critical accident emergency
CN111400141B (en) Abnormity detection method and device
CN116499609A (en) Automatic identification method, system, computer equipment and storage medium for fluctuation transient of nuclear power plant
CN106448764A (en) System and method for monitoring spent fuel pool of nuclear power plant
CN112488460B (en) Method for estimating total fission times of uranium dioxide in emergency of critical accident
CN113095579B (en) Daily-scale rainfall forecast correction method coupled with Bernoulli-gamma-Gaussian distribution
CN112488459B (en) Method for estimating total fission times of uranyl nitrate solution in critical accident emergency
JP2008157669A (en) Method, program and instrument for measuring degree of subcriticality
CN114334194B (en) High-temperature gas cooled reactor helium gas leakage early warning method, device, equipment and storage medium
CN104347126A (en) Method and device applied to display of power quadrant inclination factor of nuclear power plant reactor core
CN112488464B (en) Method for estimating total fission times of plutonium solution in case of emergency of critical accident
CN103310085A (en) Method for dynamically checking and processing normal distribution-following data
CN109886386B (en) Method and device for determining wake-up model
CN110244096B (en) Method for automatically discovering and processing electric meter full code in electric energy metering system
CN117195152B (en) Under-dam tributary jacking condition analysis system based on deep learning
CN113743532B (en) Abnormality detection method, abnormality detection device, abnormality detection apparatus, and computer storage medium
CN113080927B (en) Method and device for measuring body fat weight, measuring equipment and storage medium
CN112052760B (en) Method and device for judging learning effectiveness aiming at different article types
CN114821999B (en) Alarm function verification method and device and radioactive source monitor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant