CN-121981144-A - Method and system for detecting corrected fuel ball counter signal based on mathematical model

CN121981144ACN 121981144 ACN121981144 ACN 121981144ACN-121981144-A

Abstract

The invention discloses a method and a system for detecting a corrected fuel ball counter signal based on a mathematical model, which relate to the technical field of high-temperature gas cooled reactor detection and comprise the steps of collecting historical data, analyzing fault reasons, establishing a fault detection universal model detection fuel loading and unloading system, dividing the system operation process into three stages, establishing respective models according to different stages to optimize the universal model, comparing model detection data of different stages with fuel ball counter detection data, correcting the fuel ball counter signal, and completing the detection of the fuel loading and unloading system. The invention can accurately detect the fault condition of the fuel loading and unloading system, and compare and analyze the fault condition with the real-time signal of the fuel ball counter to find out the source of the signal fault, thereby achieving the effect of timely correcting the output of the counter. The method can accurately identify the missing report and the false report of the fuel ball counter, improve the monitoring accuracy, quickly correct the abnormal output signal of the counter and avoid influencing the subsequent judgment of the fuel quantity of the reactor.

Inventors

CHEN ZHENMIN
WU MENGZE
QIN HUI
ZHOU SHUISHENG
CHEN ZHONGZHENG
YANG QIANGQIANG
SUN YING
ZHOU XUANQING

Assignees

华能海南昌江核电有限公司

Dates

Publication Date: 20260505
Application Date: 20240220

Claims (10)

1. A method for detecting a modified fuel ball counter signal based on a mathematical model is characterized by comprising the following steps of, Collecting historical data to analyze fault reasons, and establishing a fault detection universal model to detect a fuel loading and unloading system; dividing the system operation process into three stages, and establishing respective models according to different stages to optimize the universal model; And comparing the model detection data at different stages with the fuel ball counter detection data, and correcting the fuel ball counter signal to finish the detection of the fuel loading and unloading system.
2. The method for detecting the signal of the fuel-sphere counter based on the mathematical model of claim 1, wherein the general model for fault detection is constructed by determining important parameters affecting fault detection, including temperature change, pressure change, coolant flow, vibration data, chemical composition change, radiation level, power supply and electronic signals, operation history and maintenance record, environmental factors, and human factors, and selecting the most influencing factors to be temperature change, pressure change, vibration data, power supply and electronic signals, while taking noise influence into consideration.
3. The method for detecting a modified fuel-sphere counter signal based on a mathematical model according to claim 2, wherein the fault detection general model is constructed based on the influence factor in which the influence is the largest, Wherein f 1 (T) represents a function of process temperature variation, wherein T represents temperature, f 2 (P) represents a function of process pressure variation, wherein P represents pressure, f 3 (V) represents a function of process vibration data, wherein V represents vibration, f 4 (E) represents a function of process power supply and electronic signals, wherein E represents power or electronic signals, N (x) is a noise reduction function for filtering out interference of ambient noise or other non-related signals, and w1, w2, w3, w4, w5 are weighting coefficients.
4. The method for detecting a modified fuel-sphere counter signal based on a mathematical model as set forth in claim 3, wherein said three phases are a start-up phase, an run phase and a shut-down phase, said start-up phase constructing a model excluding noise effects expressed as, Wherein, alpha n is the coefficient of each term, determines the contribution of the term to the total noise filtering effect, beta n is the parameter affecting the noise filtering sensitivity, tau n is the time offset parameter, determines the central time point of the noise filtering effect, and N is the sum term number, determines the complexity of the noise filtering function.
5. The method for detecting a fuel-sphere counter signal based on a mathematical model correction as set forth in claim 4, wherein the operation phase is to increase the calculation accuracy of the general model, and the construction accuracy increase model is expressed as, Wherein, gamma is a time scaling parameter, affects the sensitivity of the model to time variation, delta is a time offset parameter, and adjusts the translation of the model to time.
6. The method for detecting a modified fuel-sphere counter signal based on a mathematical model as set forth in claim 5, wherein the probability of failure in the shutdown phase is greater, a failure detection model is constructed for detecting a possible failure parameter expressed as, Wherein T, P, V, E, x respectively represent real-time data of temperature, pressure, vibration, electric and electronic signals and environmental noise, F T (T) is a temperature analysis function, F P (P) is a pressure analysis function, F V (V) is a vibration analysis function, F E (E) is an electric and electronic signal analysis function, F N (x) is a noise analysis function, k, lambda is an adjustment coefficient for balancing influence of each analysis function; Representing integration of the function over time intervals a to b to obtain a comprehensive risk assessment of the fault.
7. The method for detecting the fuel ball counter signal based on the mathematical model correction of claim 6, wherein the detection of the fuel handling system is completed according to the general model by combining the special models of different stages, and whether the fuel ball counter signal fails or not is judged by taking the data as a comparison; If the fuel ball counter signal is inconsistent with the model detection data, timely judging whether the fuel ball counter signal is a fuel loading and unloading system fault or not, and grading the fuel loading and unloading system fault according to the priority of the data; if the fuel ball counter signal is in fault, further checking whether the fuel ball counter signal is in fault of missing report or false report, and timely correcting by adopting data of a detection model.
8. A mathematical model-based fuel ball counter signal correction detection system, which is based on the mathematical model-based fuel ball counter signal correction method according to any one of claims 1 to 7, characterized by comprising, The building model module is used for analyzing fault reasons through historical data to build a general model; The optimizing module is used for optimizing the universal models in different stages; And the correction module is used for comparing the model detection data at different stages with the fuel ball counter detection data, correcting the fuel ball counter signal and finishing the detection of the fuel loading and unloading system.
9. The computer equipment comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is characterized in that the processor realizes the steps of the method for detecting the fuel ball counter signal based on the mathematical model, which is described in any one of claims 1-7, when executing the computer program.
10. A computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor performs the steps of the method for detecting a corrected fuel-sphere counter signal based on a mathematical model as claimed in any one of claims 1 to 7.

Description

Method and system for detecting corrected fuel ball counter signal based on mathematical model Technical Field The invention relates to the technical field of high-temperature gas cooled reactor detection, in particular to a method and a system for detecting a signal of a corrected fuel ball counter based on a mathematical model. Background The high temperature gas cooled reactor is an advanced reactor type with the fourth generation reactor characteristic, and adopts a mode of continuously loading and unloading fuel without stopping the reactor to form a flowing ball bed reactor core, so that the supply of new fuel elements and the discharge of spent fuel can be carried out without stopping the reactor. Therefore, the nuclear power plant load factor can be improved, and the reactivity required by burnup compensation is not required to be reserved, so that the safety of the reactor is improved, flexibility is provided for adjusting the unloading burnup, and the production of fissionable material plutonium-239 by a high-temperature gas cooled reactor technology is facilitated. The fuel loading and unloading system is the most critical system for realizing continuous loading and unloading of fuel without shutdown of the high-temperature gas cooled reactor, and the basis of the operation of the fuel loading and unloading system is that an operator or an automatic control program can accurately determine the number of fuel balls at each part. At present, the high-temperature gas cooled reactor fuel loading and unloading system can accurately process PI signals input to the DCS by an on-site counter instrument based on a mathematical model correction fuel ball counter signal detection program. The high-temperature gas cooled reactor adopts a mode of continuously loading and unloading fuel without shutdown, thereby realizing the flow replacement of new and old fuel. In order to ensure safe and reliable operation of the reactor, critical components such as the fuel handling system must be monitored and processed in real time. However, such systems are also prone to varying degrees of failure due to repeated operation. At present, emergency shutdown is often adopted when faults occur, and the emergency shutdown is restarted after maintenance. But this is not only time consuming and labor consuming, but also is prone to secondary accidents. If the fault system can be restarted quickly and effectively, long shutdown is avoided, the probability of secondary faults is reduced, and the method has important significance for improving the reliability and the availability of the system. The existing monitoring system and signal processing means mainly aim at the normal running state of the system and lack special detection and control of the restarting process. Once the system is restarted, various parameters can generate larger fluctuation and deviation, and the application range of the traditional model is easily exceeded, so that the detection and control are invalid. There is therefore an urgent need for new methods that enable reliable monitoring of the restart conditions. Disclosure of Invention The invention is provided in view of the problems existing in the existing detection method and system for correcting the fuel ball counter signal based on the mathematical model. Therefore, the problem to be solved by the invention is how to realize a fast and effective restart of the fault system, which avoids long shutdown and reduces the probability of re-fault. In order to solve the technical problems, the invention provides the following technical scheme: In a first aspect, an embodiment of the present invention provides a method for detecting a fuel ball counter signal based on a mathematical model, which includes collecting historical data, analyzing a failure cause, establishing a general failure detection model, detecting a fuel handling system, dividing a system operation process into three stages, establishing respective models according to the different stages, optimizing the general model, comparing model detection data of the different stages with fuel ball counter detection data, and correcting the fuel ball counter signal to complete detection of the fuel handling system. The method for detecting the corrected fuel ball counter signal based on the mathematical model is characterized in that the construction of the fault detection general model is required to determine important parameters which influence fault detection, including temperature change, pressure change, coolant flow, vibration data, chemical composition change, radiation level, power supply and electronic signals, operation history and maintenance record, environmental factors and human factors, and the most influencing factors are selected to be temperature change, pressure change, vibration data, power supply and electronic signals, and noise influence is required to be considered. As a preferable scheme of the method for detecting the correct