CN-116719837-B - Disaster superposition analysis method and system for nuclear power plant

CN116719837BCN 116719837 BCN116719837 BCN 116719837BCN-116719837-B

Abstract

The invention relates to a disaster superposition analysis method and system for a nuclear power plant, comprising the following steps of obtaining standard specification and experience feedback data of the nuclear power plant; and carrying out primary screening analysis according to the standard specification, the experience feedback data and the screening criteria to obtain a primary screening list of disaster superposition, and carrying out secondary analysis based on the primary screening list of disaster superposition and combining the range list of disaster superposition analysis to obtain a disaster superposition list. According to the method, a preliminary screening list of disaster superposition is obtained through preliminary screening analysis, the possible disaster superposition types are comprehensively and effectively combed, and the leakage is avoided.

Inventors

LIANG BO
WANG CHAO
WU FUYU
CHEN LIPING
LIU SHUANGYANG
WANG CHENGZHANG

Assignees

深圳中广核工程设计有限公司
中广核工程有限公司

Dates

Publication Date: 20260505
Application Date: 20230612

Claims (6)

1. The disaster superposition analysis method for the nuclear power plant is characterized by comprising the following steps of: Acquiring standard specification and experience feedback data of a nuclear power plant; performing preliminary screening analysis according to the standard specification, the experience feedback data and the screening criteria to obtain a preliminary screening list of disaster superposition; Performing secondary analysis based on the primary screening list of disaster superposition and combining the superimposed disaster analysis range list to obtain a disaster superposition list; the superposition disaster analysis range list is obtained by acquiring information of all structures in a nuclear power plant, judging whether a system or a component for executing a safe shutdown function is arranged in a sub item according to the information of each structure, determining the current factory as the factory needing to consider superposition disasters if the sub item is a structure of the nuclear power plant, and forming the superposition disaster analysis range list according to the determined factory needing to consider superposition disasters.
2. The method for analyzing disaster superposition for nuclear power plants according to claim 1, wherein said performing a preliminary screening analysis according to said standard specification, said empirical feedback data, and screening criteria, obtaining a preliminary screening list of disaster superposition comprises: analyzing according to the standard specification and the experience feedback data, and judging whether the disaster combination to be analyzed is a superposition disaster in the standard specification or a superposition disaster in the experience feedback data according to an analysis result; If yes, determining the disaster combination to be analyzed as a trusted superposition disaster combination; if not, judging whether the disaster combinations to be analyzed are overlapped theoretically; If the disaster combinations to be analyzed are overlapped in theory, judging whether the disaster combinations to be analyzed are excluded by the existing design measures; if the disaster combination to be analyzed is not excluded by the existing design measures, judging whether management measures for relieving or eliminating the occurrence of the disaster combination to be analyzed exist or not; If the management measures for relieving or eliminating the occurrence of the disaster combinations to be analyzed are not available, judging whether the occurrence probability of the disaster combinations to be analyzed is smaller than a set probability; if the probability of occurrence of the disaster combination to be analyzed is larger than the set probability, determining the disaster combination to be analyzed as a trusted superposition disaster combination; and forming a primary screening list of disaster superposition based on the trusted superposition disaster combination and the superposition disaster combination caused by external disasters.
3. The disaster superposition analysis method for nuclear power plants according to claim 1, wherein said performing secondary analysis based on said primary screening list of disaster superposition in combination with a superposition disaster analysis range list, obtaining a disaster superposition list comprises: Acquiring all trusted superimposed disaster combinations based on the primary screening list of disaster superimposition, wherein the trusted superimposed disaster combinations are combinations with association or secondary disasters determined in the primary screening list; The following analysis is performed for each trusted superimposed disaster combination: The system-level screening method comprises the steps of judging whether a condition is met or not, judging whether the condition is met or not according to the method, wherein the method is related to disaster superposition phenomena of the reliable superposition disaster combinations to be analyzed and enables the results of the reliable superposition disaster combinations to be analyzed to be within an acceptable range, if the condition is not met, judging whether the reliable superposition disaster combinations to be analyzed meet the condition, and if the condition is not met, judging whether the disaster results generated by the reliable superposition disaster combinations to be analyzed already comprise any disaster in the reliable superposition disaster combinations to be analyzed or the disaster results generated by the reliable superposition disaster combinations to be analyzed are smaller than the disaster results generated by any disaster in the reliable superposition disaster combinations to be analyzed, and if the condition is not met, executing sub-level screening; Combining the overlapped disaster analysis range list with the credible overlapped disaster combination to be analyzed after the system-level screening is completed, and executing sub-level screening, wherein the combined overlapped disaster analysis range list and the credible overlapped disaster combination to be analyzed are combined, and the executing sub-level screening comprises the steps of obtaining all sub-items in the overlapped disaster analysis range according to the overlapped disaster analysis range list, combining each sub-item with the credible overlapped disaster combination to be analyzed, and analyzing in a sub-step, wherein the sub-items to be analyzed are judged whether any disaster in the credible overlapped disaster combination to be analyzed can be resisted, if the sub-items to be analyzed cannot be resisted, judging whether disaster sources corresponding to the credible overlapped disaster to be analyzed exist, if the disaster sources corresponding to the credible overlapped disaster to be analyzed exist, judging whether the arrangement of the sub-items to be analyzed or the system design of the sub-items to be analyzed can avoid the credible overlapped disaster to be analyzed; after sub-item level screening is completed, specific scene function analysis is executed; The method comprises the steps of carrying out specific scene function analysis by combining the superimposed disaster combination caused by the external disasters based on the secondary classification list, obtaining the superimposed disaster combination caused by the external disasters according to a primary screening list of disaster superimposition, carrying out function analysis by combining the superimposed disaster combination caused by the external disasters according to the secondary classification list, and judging the influence of the superimposed disaster combination caused by the external disasters on a safety object according to a function analysis result; and obtaining the disaster superposition list based on the analysis result of each trusted superposition disaster combination and the analysis result of the superposition disaster combination caused by the external disaster.
4. The method for analyzing disaster superposition in a nuclear power plant according to claim 3, wherein said determining the influence of the superposition disaster combination caused by the external disaster on the safety item according to the result of the functional analysis comprises: Judging whether the influence of superposition disaster combinations caused by the external disasters on the safe object items is acceptable or not according to the starting time of the trusted external disasters, the duration time of the trusted external disasters and the consequences of the trusted external disasters on losing the external factory and/or losing the final hot trap, wherein the trusted external disasters are external disasters in the preliminary screening list; and if not, outputting the corresponding trusted superposition disaster combinations.
5. The disaster superposition analysis method for nuclear power plants according to claim 4, further comprising: determining a trusted superimposed disaster which produces unacceptable consequences according to the disaster superimposed list; the risk elimination is performed on a trusted superimposed disaster with unacceptable consequences.
6. A disaster superposition analysis system for a nuclear power plant, comprising: the acquisition unit is used for acquiring standard specifications and experience feedback data of the nuclear power plant; the preliminary screening analysis unit is used for carrying out preliminary screening analysis according to the standard specification, the experience feedback data and the screening criteria to obtain a preliminary screening list of disaster superposition; the secondary screening analysis unit is used for carrying out secondary analysis based on the primary screening list of disaster superposition and combining the superimposed disaster analysis range list to obtain a disaster superposition list; the superposition disaster analysis range list is obtained by acquiring information of all structures in a nuclear power plant, judging whether a system or a component for executing a safe shutdown function is arranged in a sub item according to the information of each structure, determining the current factory as the factory needing to consider superposition disasters if the sub item is a structure of the nuclear power plant, and forming the superposition disaster analysis range list according to the determined factory needing to consider superposition disasters.

Description

Disaster superposition analysis method and system for nuclear power plant Technical Field The invention relates to the technical field of disaster analysis of nuclear power plants, in particular to a disaster superposition analysis method and system of a nuclear power plant. Background In the design of a nuclear power plant, effective protection is generally carried out on single disasters, corresponding relief measures are taken according to the results, but in practice, some disasters often accompany or generate other disasters when the disasters occur, namely, the disasters are overlapped, and the results generated by the disaster overlapping can fail the protection measures on the single disasters, so that the pile safety is affected. Currently, analysis methods for disaster superposition in nuclear power plants mainly refer to situations specified in regulation standards, such as fire caused by earthquake, explosion caused by fire, and the like, or disaster superposition types caused by experience feedback, such as extreme rainfall, can cause external water sources. However, existing solutions list the main disaster overlay types based mainly on regulatory standards and empirical feedback, which is not comprehensive enough, can lead to missing problems, and lacks systematic carding procedures. Disclosure of Invention The invention aims to solve the technical problem of providing a disaster superposition analysis method and a disaster superposition analysis system for a nuclear power plant. The technical scheme adopted by the invention for solving the technical problems is that a disaster superposition analysis method of a nuclear power plant is constructed, and the method comprises the following steps: Acquiring standard specification and experience feedback data of a nuclear power plant; performing preliminary screening analysis according to the standard specification, the experience feedback data and the screening criteria to obtain a preliminary screening list of disaster superposition; and carrying out secondary analysis based on the primary screening list of disaster superposition and combining the superimposed disaster analysis range list to obtain a disaster superposition list. In the disaster superposition analysis method for a nuclear power plant of the present invention, the performing a preliminary screening analysis according to the standard specification, the experience feedback data and the screening criteria, the obtaining a preliminary screening list of disaster superposition includes: analyzing according to the standard specification and the experience feedback data, and judging whether the disaster combination to be analyzed is a superposition disaster in the standard specification or a superposition disaster in the experience feedback data according to an analysis result; If yes, determining the disaster combination to be analyzed as a trusted superposition disaster combination; if not, judging whether the disaster combinations to be analyzed are overlapped theoretically; If the disaster combinations to be analyzed are overlapped in theory, judging whether the disaster combinations to be analyzed are excluded by the existing design measures; if the disaster combination to be analyzed is not excluded by the existing design measures, judging whether management measures for relieving or eliminating the occurrence of the disaster combination to be analyzed exist or not; If the management measures for relieving or eliminating the occurrence of the disaster combinations to be analyzed are not available, judging whether the occurrence probability of the disaster combinations to be analyzed is smaller than a set probability; if the probability of occurrence of the disaster combination to be analyzed is larger than the set probability, determining the disaster combination to be a trusted superposition disaster combination; and forming a primary screening list of disaster superposition based on the trusted superposition disaster combination and the superposition disaster combination caused by external disasters. In the disaster superposition analysis method for a nuclear power plant, the method further comprises the following steps: Acquiring information of all structures in a nuclear power plant; Judging whether a system or a component for executing a safe shutdown function is arranged in a sub item according to the information of each structure; if yes, determining the current factory building as the factory building needing to consider the superposition disasters; and forming the overlapping disaster analysis range list according to the determined factory buildings needing to consider the overlapping disasters. In the disaster superposition analysis method for a nuclear power plant, the primary screening list based on disaster superposition is combined with the superposition disaster analysis range list to perform secondary analysis, and the obtaining of the disaster superposition list comp