CN109543941B - Method for determining accident strategy fixed value of nuclear power plant based on containment working condition - Google Patents
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Abstract
The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for determining a nuclear power plant accident strategy fixed value based on containment working conditions. The method comprises the following steps: (1) determining a parameter fixed value nominal value in an accident handling strategy; (2) judging and screening key fixed values of the accident handling strategy; (3) determining instrument errors of key fixed values under normal working conditions and unfavorable working conditions of the containment vessel; (4) analyzing the influence of the error of the instrument on the accident handling guide rule; (5) analyzing, calculating and verifying the fixed value conformity; (6) and (5) verifying and confirming. By using the method for determining the accident strategy fixed value of the nuclear power plant based on the containment working condition, the instrument error under the working condition can be respectively considered for different containment working conditions (normal working condition and adverse working condition), and the influence of the instrument error on the key fixed value in the accident strategy is combined for optimization calculation to obtain two groups of fixed values under the normal working condition and the adverse working condition. And finally, judging whether the constant value can meet the requirement of the criterion through calculation and verification.
Description
Technical Field
The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for determining a nuclear power plant accident strategy fixed value based on containment working conditions.
Background
The nuclear power plant system is complex, the operation parameters are many, once the accident condition occurs, the nuclear power plant is considered to enter an emergency state, and at the moment, an operator is required to make a quick response, correct the condition deviation and take necessary actions to avoid or alleviate possible consequences. The accident handling regulation is an important component for realizing the deep defense of the nuclear power plant, is directly related to the operation safety of the nuclear power plant, and plays an important role in limiting the accident development and ensuring the safety of a reactor.
Accident management strategies may be used to mitigate and limit the consequences of an accident. The fixed value applied in the accident handling strategy can be used for diagnosing the accident, the accident result can be relieved through manual operation according to the set fixed value, and the nuclear power plant can be confirmed to be in the safe shutdown working condition through the fixed value. It is very important to set the setting value correctly. During the design process of the fixed value, the working condition of the accident handling strategy must include the environmental condition of high temperature, high pressure and high radiation of the containment vessel, and the error of the instrument tends to be worsened under the adverse working condition. In order to ensure the effectiveness of the fixed value of the accident key parameter, the error of the instrument needs to be considered in the setting of the fixed value, particularly the error of the instrument under the condition of the unfavorable working condition of the containment. Therefore, the key fixed value needs to be analyzed based on different containment operating conditions, the instrument error influence under the normal operating condition and the adverse operating condition of the containment is considered, and the strategy fixed value needs to be reasonably optimized.
Disclosure of Invention
The invention aims to provide a method for determining a fixed value of an accident strategy of a nuclear power plant based on the working condition of a containment vessel.
To achieve this object, in a basic embodiment, the present invention provides a method for determining a nuclear power plant accident strategy rating based on containment operating conditions, the method comprising the steps of:
(1) determining a parameter fixed value nominal value in an accident handling strategy;
(2) judging and screening out a key fixed value of an accident handling strategy;
(3) determining instrument errors of key fixed values under normal working conditions and unfavorable working conditions of the containment vessel;
(4) analyzing the influence of instrument errors on accident handling guide rules under normal working conditions and adverse working conditions of the containment vessel, and modifying the key strategy fixed values as required;
(5) carrying out fixed value conformance analysis, calculation and verification;
(6) and carrying out verification and confirmation through a design verification platform.
The method screens out key fixed values based on the fixed values in the accident handling strategy, analyzes the influence of the working conditions on the accident handling strategy by combining instrument errors of the instrument under normal and adverse working conditions of the containment vessel, ensures the effectiveness of the fixed values of the parameters, determines the acceptable degree of the instrument errors by conforming to the analysis calculation, and finally carries out comprehensive strategy verification by means of a verification platform and the like to confirm the correctness and the availability of the accident handling strategy and the fixed values.
In a preferred embodiment, the invention provides a method for determining a fixed value of a nuclear power plant accident strategy based on containment working conditions, wherein in step (1), based on analysis of an accident handling strategy, corresponding fixed values are set for tasks or functions to be completed in the step, the set fixed values are subjected to effectiveness analysis through conformance calculation, a set of complete accident handling strategies is finally formed, and fixed value nominal values in the complete accident handling strategies are confirmed.
In a preferred embodiment, the invention provides a method for determining a fixed value of an accident strategy of a nuclear power plant based on the working condition of a containment, wherein in the step (2), a key fixed value of an accident handling strategy, which needs to consider an instrument error, is judged and screened, and the influence of the instrument error under the normal working condition and the adverse working condition of the containment is analyzed on the fixed value.
In a preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy fixed value based on the containment condition, wherein the screening method in the step (2) comprises the following steps:
1) the method is used for accident diagnosis and determining the trend of an accident handling strategy;
2) through the fixed value judgment, the safety function needs to be executed through manual measures to relieve the accident consequence;
3) for judging the effect of accident mitigation.
In a preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy fixed value based on a containment working condition, wherein in the step (3), normal working condition and unfavorable working condition limits of a containment are determined based on unit design characteristics and an accident analysis conclusion, and a total instrument error of a key fixed value in an accident handling strategy under the normal working condition and the unfavorable working condition is calculated and determined.
In a more preferred embodiment, the invention provides a method for determining the accident strategy fixed value of the nuclear power plant based on the containment working condition, wherein in the step (3), the total error of the instrument is calculated by the precision errors of all components of the instrument and the channel, including the error of an instrument measuring device, the error of an isolation module, the error of an I/O card module and the error of a display instrument.
In a preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy fixed value based on the containment condition, wherein in the step (4):
on one hand, the influence of the adverse working condition of the containment on the key fixed value needs to be taken into consideration, and if the fixed value always considers the instrument error under the normal working condition, the measurement result is inaccurate, and the condition of large error under the adverse working condition of the containment cannot be enveloped;
on the other hand, the influence of instrument errors under adverse conditions needs to be avoided from being excessively considered in the design process.
In a preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy fixed value based on the containment working condition, wherein in step (5), for the modified fixed value, firstly, compliance analysis calculation is carried out through a calculation program to verify the key fixed value in the accident handling strategy and the acceptable degree of an instrument error, and if the calculation result after verification cannot meet the requirement, and at the moment, the instrument error influences the execution of the accident handling strategy, the instrument needs to be selected again for analysis and calculation again. After the error of the instrument is calculated, the key fixed value in the accident handling strategy and the acceptable degree of the error of the instrument are verified through conformance analysis calculation, if the requirement cannot be met after verification, and the error of the instrument influences the execution of the accident handling strategy, the instrument needs to be selected again for analysis and verification again.
In a preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy fixed value based on containment working conditions, wherein in the step (6), comprehensive dynamic verification and confirmation of an accident handling strategy are carried out through a design verification platform, the rationality of a guide strategy and the fixed value is confirmed, and if the requirements cannot be met after verification, instrument analysis and verification need to be carried out again.
In a more preferred embodiment, the invention provides a method for determining a nuclear power plant accident strategy rating based on containment operating conditions, wherein in step (6), the reasonableness of the uncertainty rating includes whether personnel intervention time is sufficient.
The method for determining the accident strategy fixed value of the nuclear power plant based on the containment working condition has the advantages that the fixed value in the accident strategy can be determined by combining the instrument errors respectively under the normal and adverse working conditions of the containment, the safety margin of the fixed value can be ensured under the adverse working condition of the containment, and the influence of the instrument errors can not be excessively considered by the fixed value under the normal working condition of the containment. And the design requirements can be met by calculating and verifying the guide policy and the fixed value through the conformity analysis and calculation and the design verification platform.
The beneficial effects of the invention are embodied in that:
(1) the invention is based on the comprehensive analysis of an accident handling strategy, combines errors of an instrument under normal and adverse working conditions of a containment, carries out uncertainty influence analysis on a fixed value of the accident handling strategy respectively aiming at the normal working condition and the adverse working condition of the containment, and provides an analysis and determination method for the uncertainty of the working condition of the containment of the accident handling strategy fixed value of a pressurized water reactor nuclear power plant. The method is applicable to the design of the fixed value of the accident handling strategy of the pressurized water reactor nuclear power station unit.
(2) The invention provides a method for screening key definite values of an accident handling strategy.
(3) The method adopts a double verification strategy of the conformity analysis calculation and the verification platform, and has important significance for guaranteeing the effectiveness of the fixed value of the important parameter in the accident handling strategy of the nuclear power plant.
(4) The method is not only suitable for newly-built nuclear power plants, but also can be directly applied to the fixed value uncertainty analysis design in the accident regulation modification design of in-service nuclear power plants.
Drawings
FIG. 1 is a flow chart illustrating an exemplary method of determining a nuclear power plant accident strategy rating based on containment operating conditions of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
An exemplary method of determining a nuclear power plant accident strategy rating based on containment operating conditions of the present invention is illustrated in FIG. 1 and includes the following steps.
(1) Determining nominal value of fixed value of parameter in accident handling strategy
Based on the analysis of the accident handling strategy, corresponding fixed values are set for tasks or functions to be completed in the steps, the effectiveness analysis is carried out on the set fixed values through the conformity analysis calculation, finally, a set of complete accident handling strategy is formed, and the value of the fixed value nominal value is confirmed.
(2) Screening of critical constants for incident management strategies
The key constant value in the accident handling strategy is a constant value which has a decisive meaning for the execution of the accident strategy and can influence the strategy execution effect. Therefore, key fixed values of instrument errors need to be considered in the accident handling strategy are judged and screened, and the influence of the instrument errors under the normal working condition and the adverse working condition of the containment is analyzed on the fixed values. The screening method comprises the following steps:
1) the method is used for accident diagnosis and determining the trend of an accident handling strategy;
2) through the fixed value judgment, the safety function needs to be executed through manual measures to relieve the accident consequence;
3) for judging the effect of accident mitigation.
(3) And determining the normal working condition and the unfavorable working condition limit of the containment vessel based on the unit design characteristics and the accident analysis conclusion, and calculating and determining the total instrument error of the key constant value in the accident handling strategy under the normal working condition and the unfavorable working condition. The total error of the instrument is calculated by the precision errors of all components of the instrument and the channel, including the error of a measuring device of the instrument, the error of an isolation module, the error of an I/O card module and the error of a display instrument.
(4) Analyzing the influence of the error of the instrument on the accident handling guide rule, and modifying the strategy or the fixed value according to the requirement. On the one hand, the influence of the adverse operating conditions of the containment on the critical fixed values needs to be taken into account. If the instrument error under the normal working condition is always considered for the fixed value, the measurement result is inaccurate, and the condition of large error under the unfavorable working condition of the containment cannot be enveloped; on the other hand, the influence of instrument errors under adverse conditions needs to be avoided from being excessively considered in the design process. According to the method, the uncertainty of the relevant instrument is respectively considered according to the normal working condition and the unfavorable working condition of the containment.
(5) Constant value conformity analysis calculation verification
After the instrument error is calculated, the fixed value in the accident handling strategy and the acceptable degree of the instrument error need to be confirmed through conformance analysis calculation. If the requirements cannot be met after verification, and the error of the instrument influences the execution of the accident handling strategy, the instrument needs to be reselected for analysis and verification again.
(6) Authentication and validation
And finally, performing comprehensive strategy verification through the verification and the confirmation of the accident handling strategy, and confirming the reasonability of the uncertainty fixed value of the working condition of the containment, including whether the personnel intervention time is sufficient or not. If the requirements cannot be met after verification, instrument analysis and verification are required to be carried out again.
The application of the above exemplary method for determining the nuclear power plant accident strategy fixed value based on the containment operating conditions of the present invention is as follows (taking the steam generator narrow range liquid level control requirement in fission power generation/ATWS response guideline as an example).
(1) Determining nominal value of fixed value of parameter in accident handling strategy
The range of the narrow-range liquid level of the steam generator is L1～L2(m) of the reaction mixture. The accident management guide rule requires that the narrow range water level of the steam generator should exceed the height of the U-shaped pipe, namely the range liquid level is more than 0%. Therefore, the nominal value of the fixed value of the parameter in the preliminary determination guide rule is L1(m)。
(2) Judging and screening out key constant value of accident handling strategy
The key constant value in the strategy can generate decisive significance for the execution of the accident strategy and can influence the effect of the strategy execution. For the narrow range liquid level of the steam generator, the requirement is that the steam generator must submerge a U-shaped pipe, and the liquid level is L1(m) which affects the availability of the steam generator and is therefore a key determinant.
(3) Instrument error for determining key constant value under normal working condition and unfavorable working condition of containment
And determining the working condition limit of the containment according to the design characteristics of the unit and the accident analysis conclusion, and calculating and determining the total error of the instrument of the key fixed value in the accident handling strategy under the normal working condition and the unfavorable working condition. The total error of the instrument is calculated by the precision errors of all components of the instrument and the channel, including the error of a measuring device of the instrument, the error of an isolation module, the error of an I/O card module, the error of a display instrument and the like.
The narrow-range liquid level of the steam generator is required to be higher than L and larger than U-shaped pipe1(m) of the reaction mixture. Through calculation, under the condition of normal working condition of the containment, the influence of instrument error is considered, L1(m) measuring the liquid level by taking deltanAn error of (2); and under the condition of unfavorable working conditions of the containment, the instrument is at L1Error in the measurement at (m) position is δabn。
(4) Influence of comprehensive analysis instrument error on accident handling guide rule
And (3) errors of the instrument under different containment working conditions are respectively considered, the instrument error under the normal working condition is used under the normal working condition, and the instrument error under the unfavorable working condition is used under the unfavorable working condition, so that the increase of the uncertainty of the instrument is avoided, and the effectiveness and the accuracy of the measurement of the instrument are improved.
Steam generator narrow range water level L in guide rule1(m) two sets of fixed values L are calculated by respectively considering the normal working condition and the unfavorable working condition of the containment1nAnd L1abn. Wherein L is1n＝L1+δn(m)，L1abn＝L1+δabn(m) of the reaction mixture. When the actual liquid level of the steam generator exceeds the setting value under the corresponding working condition, the secondary side heat trap recovers, and an operator can maintain the water level stability of the steam generator by controlling the water supply flow.
(5) Verifying the constant value
The verification of the constant value includes two parts: the method comprises the steps of conformance analysis calculation verification and verification platform verification.
1) And (3) performing conformance analysis calculation: after the corresponding instrument errors under normal and unfavorable working conditions of the containment are obtained, the definite value of the analyzed narrow-range water level of the evaporator and the acceptable degree of the instrument errors need to be confirmed through conformance analysis calculation. If the requirements cannot be met, the instrument needs to be reselected, and the step (3) is returned to continue to carry out calculation analysis and verification.
2) And (3) verification by a verification platform: and finally, carrying out comprehensive strategy verification through the verification and confirmation of the accident handling strategy to confirm the effectiveness of the strategy. If the requirements cannot be met, returning to the step (3) to continue the calculation analysis and the verification until the verification requirements are met finally.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The above-described embodiments are merely illustrative of the present invention, and the present invention may be embodied in other specific forms or other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.
Claims (6)
1. A method for determining a nuclear power plant accident strategy fixed value based on containment working conditions is characterized by comprising the following steps:
(1) determining a parameter fixed value nominal value in an accident handling strategy;
(2) judging and screening out a key fixed value of an accident handling strategy;
(3) determining instrument errors of key fixed values under normal working conditions and unfavorable working conditions of the containment vessel;
(4) analyzing the influence of instrument errors on accident handling guide rules under normal working conditions and adverse working conditions of the containment vessel, and modifying strategy fixed values according to requirements;
(5) carrying out fixed value conformance analysis, calculation and verification;
(6) the verification and the confirmation are carried out through designing a verification platform,
wherein:
in the step (5), after the error of the instrument is calculated, the fixed value in the accident handling strategy and the acceptable degree of the error of the instrument need to be confirmed through conformance analysis calculation, if the requirement cannot be met after verification and the error of the instrument influences the execution of the accident handling strategy, the instrument needs to be reselected for analysis and verification again,
and (6) finally, performing comprehensive strategy verification through the verification and the confirmation of the accident handling strategy, and confirming the reasonability of the uncertainty fixed value of the working condition of the containment, including whether the personnel intervention time is sufficient, wherein if the requirement cannot be met after the verification, instrument analysis and verification are required to be performed again.
2. The method of claim 1, wherein: in the step (1), based on the analysis of the accident handling strategy, corresponding fixed values are set for the tasks or functions to be completed in the step, the effectiveness of the set fixed values is analyzed through conformity calculation, a set of complete accident handling strategy is finally formed, and the nominal value of the fixed value is confirmed.
3. The method of claim 1, wherein: in the step (2), key fixed values of instrument errors needing to be considered in the accident handling strategy are judged and screened, and the influence of the instrument errors under the normal working condition and the adverse working condition of the containment is analyzed on the fixed values.
4. The method of claim 1, wherein the screening method of step (2) comprises:
1) the method is used for accident diagnosis and determining the trend of an accident handling strategy;
2) through the fixed value judgment, the safety function needs to be executed through manual measures to relieve the accident consequence;
3) for judging the effect of accident mitigation.
5. The method of claim 1, wherein: and (3) determining the normal working condition and the unfavorable working condition limit of the containment based on the unit design characteristics and the accident analysis conclusion, and calculating and determining the total instrument error of the key fixed value in the accident handling strategy under the normal working condition and the unfavorable working condition.
6. The method of claim 5, wherein: in the step (3), the total error of the instrument is calculated by the precision errors of all components of the instrument and the channel, including the error of an instrument measuring device, the error of an isolation module, the error of an I/O card module and the error of a display instrument.
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| CN110993135A (en) * | 2019-10-09 | 2020-04-10 | 中国核电工程有限公司 | Sign-based design method for secondary side heat trap control strategy of pressurized water reactor nuclear power plant |
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| CN111967711B (en) * | 2020-07-07 | 2024-10-29 | 中国核电工程有限公司 | Method for determining unfavorable working conditions in containment related to accident strategy of pressurized water reactor nuclear power plant |
| CN111834025B (en) * | 2020-07-07 | 2022-08-23 | 广东核电合营有限公司 | Evaluation method for prolonging cycle of check type supervision project of safety related instrument of nuclear power plant |
| CN112330124B (en) * | 2020-10-28 | 2024-03-12 | 广东核电合营有限公司 | Method and system for evaluating influence of accident environment on uncertainty of instrument channel |
| CN112598223B (en) * | 2020-12-03 | 2023-08-01 | 中广核工程有限公司 | Nuclear power state guiding method accident regulation completeness checking method, system, electronic equipment and storage medium |
| CN113421676B (en) * | 2021-06-18 | 2022-05-10 | 中国核动力研究设计院 | Method and device for determining accident procedure setting value of nuclear power plant |
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