CN111967711A - Method for determining unfavorable working conditions in containment related to accident strategy of pressurized water reactor nuclear power plant - Google Patents
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Abstract
本发明属于核安全评价技术领域，涉及压水堆核电厂事故策略相关安全壳内不利工况的确定方法。所述的确定方法包括如下步骤：(1)运行工况的划分；(2)判断工况是否会造成安全壳环境条件较大变化；(3)分析纳入安全壳正常工况的事件；(4)分析纳入安全壳不利工况的事件；(5)分析环境条件对仪表显示精度的影响；(6)结合仪表特性分析正常工况与不利工况的环境条件边界值。利用本发明的压水堆核电厂事故策略相关安全壳内不利工况的确定方法，能够更为准确的确定安全壳不利工况条件，从而在此基础上可考虑安全壳不利工况下仪表误差对事故处理策略定值的影响。
The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant. The determination method includes the following steps: (1) division of operating conditions; (2) judging whether the operating conditions will cause a large change in the environmental conditions of the containment; (3) analyzing the events included in the normal operating conditions of the containment; (4) ) to analyze the events included in the unfavorable working conditions of the containment; (5) to analyze the influence of environmental conditions on the display accuracy of the instrument; (6) to analyze the boundary values of environmental conditions for normal and unfavorable operating conditions in combination with the characteristics of the instrument. By using the method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant of the present invention, the unfavorable working conditions of the containment can be more accurately determined, and on this basis, the instrument error under the unfavorable working conditions of the containment can be considered The impact on the value of the accident handling strategy.
Description
技术领域technical field
本发明属于核安全评价技术领域，涉及压水堆核电厂事故策略相关安全壳内不利工况的确定方法。The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant.
背景技术Background technique
对于压水堆核电厂，安全壳作为防止放射性物质外泄的第三道屏障，能够减轻事故后潜在的放射性释放后果，滞留放射性物质。当核电厂发生一回路破口、蒸汽管道破裂等事故时，安全壳可以承受由这些事故所导致的壳内高温高压。但随着事故的发展，安全壳压力升高，最终将投运安全壳冷却的相关系统来确保安全壳的完整性；同时，安全壳所承受的高温高压高辐照的不利环境条件也对安全壳内的测量仪表产生很大的影响。For pressurized water reactor nuclear power plants, as the third barrier to prevent the leakage of radioactive materials, the containment can reduce the potential consequences of radioactive release after an accident and retain radioactive materials. When accidents such as rupture of the primary circuit and rupture of the steam pipeline occur in the nuclear power plant, the containment can withstand the high temperature and high pressure in the shell caused by these accidents. However, with the development of the accident, the pressure of the containment increases, and the relevant system for cooling the containment will eventually be put into operation to ensure the integrity of the containment. The measuring instrument has a great impact.
在事故发生时及发生后，安全壳环境条件恶化，安全壳内测量仪表的误差将超出正常工况下仪表误差的精度范围。根据环境条件以及仪表自身特性，不利工况相较于正常工况会使误差变大。诸如电厂发生一回路破口、蒸汽管道破裂等事故时，安全壳内环境恶化，质能的大量释放会对相关测量仪表的误差产生较大影响。若对定值始终考虑正常工况下的仪表误差，将导致测量结果的不准确，不能包络住安全壳不利工况下的大误差，将会影响核电厂事故处理策略中重要参数定值的有效性。因此，需要确定安全壳不利工况条件，进而考虑安全壳不利工况下仪表误差对事故处理策略定值的影响。During and after the accident, the environmental conditions of the containment deteriorate, and the error of the measuring instrument in the containment will exceed the accuracy range of the instrument error under normal working conditions. According to the environmental conditions and the characteristics of the instrument itself, the unfavorable operating conditions will make the error larger than the normal operating conditions. In the event of an accident such as a break in the primary circuit or rupture of a steam pipeline in a power plant, the environment inside the containment deteriorates, and a large amount of mass and energy is released, which will have a greater impact on the errors of the relevant measuring instruments. If the instrument error under normal conditions is always considered for the setting value, it will lead to inaccurate measurement results and cannot cover the large error under unfavorable conditions of the containment, which will affect the setting value of important parameters in the accident handling strategy of the nuclear power plant. effectiveness. Therefore, it is necessary to determine the unfavorable working conditions of the containment, and then consider the influence of the instrument error on the setting value of the accident handling strategy under the unfavorable working conditions of the containment.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，以能够更为准确的确定安全壳不利工况条件，从而在此基础上可考虑安全壳不利工况下仪表误差对事故处理策略定值的影响。The purpose of the present invention is to provide a method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant, so that the unfavorable working conditions of the containment can be more accurately determined, so that the unfavorable working conditions of the containment can be considered on this basis. The influence of the lower instrument error on the setting value of the accident handling strategy.
为实现此目的，在基础的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，所述的确定方法包括如下步骤：In order to achieve this purpose, in a basic embodiment, the present invention provides a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant. The method for determining includes the following steps:
(1)运行工况的划分：针对核电厂运行工况，按照预计事件发生频率和潜在的放射性后果对公众的影响，将运行工况分成四类，分别为I类工况、II类工况、III类工况和IV类工况；(1) Division of operating conditions: According to the operating conditions of nuclear power plants, the operating conditions are divided into four categories according to the expected frequency of events and the impact of potential radioactive consequences on the public, namely category I and category II. , Class III working conditions and Class IV working conditions;
(2)判断工况是否会造成安全壳环境条件较大变化：对核电厂寿期内可能发生的事件进行判断，判断该事件是否会对安全壳环境产生质能释放，导致安全壳内明显的升温升压，将引起安全壳内质能释放的工况纳入安全壳正常工况和不利工况条件边界条件分析的范围；(2) Judging whether the working conditions will cause a large change in the environmental conditions of the containment: Judging the events that may occur during the life of the nuclear power plant to determine whether the event will release mass and energy to the containment environment, resulting in obvious changes in the containment. Increase the temperature and pressure, and include the working conditions that cause the release of the inner mass energy of the containment into the scope of the boundary condition analysis of the normal and unfavorable working conditions of the containment;
(3)分析纳入安全壳正常工况的事件：根据分析，按照事故发生的频率，将电厂寿期内可能发生的包括I类和II类工况在内的事故工况纳入安全壳正常工况的范围，并分析此类工况中会导致安全壳内质能释放的工况，安全壳正常工况包络此类工况；(3) Analysis of the events included in the normal working conditions of the containment: According to the analysis, according to the frequency of accidents, the accident conditions that may occur during the life of the power plant, including the I and II working conditions, are included in the normal working conditions of the containment and analyze the conditions that will lead to the release of the inner mass energy of the containment in such conditions, and the normal conditions of the containment envelop such conditions;
(4)分析纳入安全壳不利工况的事件：事故规程应对的工况包括设计基准工况以及燃料未明显降级的设计扩展工况，对于除I类和II类工况的其它工况中造成安全壳内质能释放的工况均应纳入安全壳不利工况考虑的范围；(4) Analysis of events including adverse conditions of containment: the conditions to be dealt with in the accident regulations include design basis conditions and design extended conditions where the fuel is not significantly degraded. The conditions for the release of the internal energy of the containment shall be included in the consideration of the unfavorable conditions of the containment;
(5)分析环境条件对仪表显示精度的影响；(5) Analyze the influence of environmental conditions on the display accuracy of the instrument;
(6)结合仪表特性分析正常工况与不利工况的环境条件边界值：确定安全壳正常工况与不利工况的环境边界条件，对于安全壳正常工况，结合上述步骤(3)的分析，将安全壳正常运行环境条件纳入安全壳正常工况的范围；对于安全壳不利工况，结合上述步骤(4)的分析，将所应对工况包络的环境条件纳入安全壳不利工况的范围。(6) Combine the characteristics of the instrument to analyze the environmental boundary values of the normal and unfavorable operating conditions: determine the environmental boundary conditions of the normal operating conditions and unfavorable operating conditions of the containment. For the normal operating conditions of the containment, combine the analysis of the above step (3). , the normal operating environmental conditions of the containment are included in the scope of the normal operating conditions of the containment; for the unfavorable operating conditions of the containment, combined with the analysis of the above step (4), the environmental conditions of the envelope of the corresponding operating conditions are included in the unfavorable operating conditions of the containment. scope.
在核电厂发生一回路破口、蒸汽管道破裂等事故时，安全壳内大量质能的释放会对相关测量仪表的误差产生较大影响，进而也会影响核电厂事故处理策略中重要参数定值的有效性。为了保证事故处理策略中参数定值有效，需要将仪表误差，特别是安全壳不利工况条件下的仪表误差考虑在定值设置中。In the event of an accident such as a rupture of the primary circuit or a rupture of a steam pipeline in a nuclear power plant, the release of a large amount of mass energy in the containment will have a greater impact on the errors of the relevant measuring instruments, which will also affect the setting of important parameters in the nuclear power plant accident handling strategy. effectiveness. In order to ensure that the parameter settings in the accident handling strategy are effective, it is necessary to consider the instrument error, especially the instrument error under the unfavorable working conditions of the containment, in the setting of the fixed value.
为了将安全壳不利工况的影响考虑在内，又不会因为安全壳不利工况仪表误差导致正常工况下事故处理策略定值过度考虑仪表的不确定度，将安全壳工况分为安全壳正常工况和安全壳不利工况。在安全壳正常工况下使用安全壳正常工况下的仪表不确定度，而在安全壳不利工况条件下，仪表的误差将变大，这时使用安全壳不利工况下的仪表误差。因此，必须对安全壳正常工况到不利工况的临界点进行确定，最终确定安全壳正常工况以及安全壳不利工况鉴定条件。In order to take into account the influence of the unfavorable working conditions of the containment, and not to over-consider the uncertainty of the instrument due to the instrument error of the unfavorable working conditions of the containment, the setting value of the accident handling strategy under normal working conditions will overly consider the uncertainty of the instrument. Shell normal conditions and containment unfavorable conditions. Under the normal working condition of the containment, the instrument uncertainty under the normal working condition of the containment is used, and under the unfavorable working condition of the containment, the error of the instrument will become larger, and the instrument error under the unfavorable working condition of the containment is used at this time. Therefore, it is necessary to determine the critical point from the normal working condition of the containment to the unfavorable working condition, and finally determine the qualification conditions of the normal working condition of the containment and the unfavorable working condition of the containment.
本发明根据核电厂所应对的各类事故工况，依照事故发生的频率筛选出寿期内可能发生的事故工况，并对其是否可以纳入正常或不利安全壳环境条件分析做出判断，最后结合测量仪表的特性确认正常安全壳环境条件的边界点，从而提出了一种安全壳不利工况的确定方法。According to the various accident conditions dealt with by the nuclear power plant, the invention screens out the accident conditions that may occur during the lifetime according to the frequency of accidents, and judges whether they can be included in the analysis of normal or unfavorable containment environmental conditions, and finally Combined with the characteristics of measuring instruments, the boundary points of normal containment environmental conditions are confirmed, and a method for determining unfavorable conditions of containment is proposed.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(1)中，所述的I类工况为正常运行，该类工况下包括的事件指核电厂在正常运行以及换料维修过程中预期会经常或者有规律发生的事件。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant, wherein in step (1), the type I working condition is normal operation, and the type I working condition is normal operation. The events included in the operating conditions refer to the events that are expected to occur frequently or regularly during the normal operation and refueling maintenance of the nuclear power plant.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(1)中，所述的II类工况为预期运行，该类工况属于中等频率事件，运行寿期内有一次或数次偏离正常运行的过程，只要保护系统能够正常运行就不会导致很严重的后果发生，一般每年可能发生。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in the containment related to the accident strategy of a pressurized water reactor nuclear power plant, wherein in step (1), the type II working conditions are expected The working condition is a medium frequency event, and there is one or several deviations from the normal operation during the operating life. As long as the protection system can operate normally, it will not lead to serious consequences, which may occur every year.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(1)中，所述的III类工况为稀有事故，该类工况在整个运行寿期内一般极少发生。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant, wherein in step (1), the type III working condition is a rare accident, and the type III working condition is a rare accident. Conditions are generally rare throughout the operating life.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(1)中，所述的IV类工况为极限事故，该类工况在运行寿期内发生概率极低，一般被认为是极不可能发生的事故工况，一旦发生就会释放出大量放射性物质。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant, wherein in step (1), the type IV working condition is a limit accident, and this type The working condition has a very low probability of occurrence during the operating life and is generally regarded as an extremely unlikely accident condition. Once it occurs, a large amount of radioactive substances will be released.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(4)中，所述的安全壳不利工况包络的环境条件包含安全壳温度、压力以及辐照条件。In a preferred embodiment, the present invention provides a method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant, wherein in step (4), the environmental conditions enveloped by the unfavorable working conditions of the containment Contains containment temperature, pressure, and irradiation conditions.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(5)中，所述的仪表显示精度应将仪表以及通道的所有组件的精度均计算在内。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in a containment vessel related to an accident strategy of a pressurized water reactor nuclear power plant, wherein in step (5), the display accuracy of the instrument should be the same as that of all the instruments and the channel. The precision of the components is taken into account.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(5)中，对于安全壳不利工况下的仪表误差，需要考虑高能管线破裂的影响，包括温度、压力以及辐照的影响。In a preferred embodiment, the present invention provides a method for determining unfavorable working conditions in the containment related to the accident strategy of a pressurized water reactor nuclear power plant, wherein in step (5), for the instrument error under unfavorable working conditions of the containment, it is necessary to consider The effects of high-energy pipeline rupture, including the effects of temperature, pressure, and radiation.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(6)中，所述的安全壳正常运行环境条件和所述的所应对工况包络的环境条件包括温度、压力和辐照。In a preferred embodiment, the present invention provides a method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant, wherein in step (6), the normal operating environmental conditions of the containment and the The environmental conditions of the operating envelope to be dealt with include temperature, pressure and irradiation.
在一种优选的实施方案中，本发明提供压水堆核电厂事故策略相关安全壳内不利工况的确定方法，其中步骤(6)中，所述的安全壳不利工况和所述的所应对工况包络的环境条件包括温度、压力和辐照。In a preferred embodiment, the present invention provides a method for determining the unfavorable working conditions in the containment related to the accident strategy of a pressurized water reactor nuclear power plant, wherein in step (6), the unfavorable working conditions of the containment and all the unfavorable working conditions of the containment Environmental conditions that deal with the operating envelope include temperature, pressure, and irradiation.
本发明的有益效果在于，利用本发明的压水堆核电厂事故策略相关安全壳内不利工况的确定方法，能够更为准确的确定安全壳不利工况条件，从而在此基础上可考虑安全壳不利工况下仪表误差对事故处理策略定值的影响。The beneficial effect of the present invention is that by using the method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant of the present invention, the unfavorable working conditions of the containment can be more accurately determined, so that the safety can be considered on this basis. The influence of instrument error on the setting value of accident treatment strategy under unfavorable working conditions of shell.
本发明的有益效果具体体现在：The beneficial effects of the present invention are embodied in:
(1)本发明将安全壳工况划分为正常工况与不利工况分别进行分析。在事故处理策略的参数定值中既将安全壳不利工况的影响考虑在内，又不会因为安全壳不利工况仪表误差导致正常工况下事故处理策略定值过度考虑仪表的不确定度。分别考虑安全壳正常工况与不利工况下的仪表误差，对保障电厂事故处理策略中重要参数定值有效性有重要意义。(1) The present invention divides the containment working conditions into normal working conditions and unfavorable working conditions for analysis respectively. In the parameter setting of the accident handling strategy, the influence of the unfavorable working conditions of the containment is taken into account, and the uncertainty of the instrument is not overly considered in the setting of the accident handling strategy under normal working conditions due to the instrument error of the unfavorable working conditions of the containment. . Considering the instrument error under normal and unfavorable conditions of the containment respectively is of great significance to ensure the validity of the important parameter setting in the accident handling strategy of the power plant.
(2)本发明结合壳内仪表的特性，确定了对仪表精度产生影响的因素，根据事故发生的频率，提供了一种压水堆核电厂的事故策略相关安全壳内不利工况的确定方法。(2) The present invention determines the factors that affect the accuracy of the instrument in combination with the characteristics of the instrument in the shell, and provides a method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant according to the frequency of accidents. .
附图说明Description of drawings
图1为示例性的本发明的压水堆核电厂事故策略相关安全壳内不利工况的确定方法的流程图。FIG. 1 is a flowchart of an exemplary method for determining unfavorable working conditions in a containment related to the accident strategy of a pressurized water reactor nuclear power plant according to the present invention.
具体实施方式Detailed ways
以下结合附图对本发明的具体实施方式作出进一步的说明。The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
示例性的本发明的压水堆核电厂事故策略相关安全壳内不利工况的确定方法的流程如图1所示，包括如下步骤。An exemplary flow chart of the method for determining the unfavorable working conditions in the containment related to the accident strategy of the pressurized water reactor nuclear power plant of the present invention is shown in FIG. 1 , and includes the following steps.
(1)对事故工况进行分类(1) Classification of accident conditions
针对核电厂的运行工况，按照预计事件发生频率和潜在的放射性后果，将运行工况具体分成下述四类：According to the operating conditions of nuclear power plants, according to the expected frequency of events and potential radiological consequences, the operating conditions are divided into the following four categories:
第I类工况-正常运行：该类工况下包括的事件一般指核电厂在正常运行以及换料维修过程中预期会经常或者有规律发生的事件。例如换料，停堆，启动，功率运行等。Category I operating conditions - normal operation: The events included in this category of operating conditions generally refer to the events that are expected to occur frequently or regularly during the normal operation and refueling maintenance of the nuclear power plant. Such as refueling, shutdown, start-up, power operation, etc.
第II类工况-预期运行：该类工况属于中等频率事件，运行寿期内有一次或数次偏离正常运行的过程，只要保护系统能够正常运行就不会导致很严重的后果发生，一般每年可能发生。例如电源丧失，给水意外丧失，汽机跳闸等。Type II working condition - expected operation: this type of working condition is a medium frequency event, and there is one or several deviations from normal operation during the operation life. As long as the protection system can operate normally, it will not lead to serious consequences. Generally, May happen every year. For example, power loss, accidental loss of water supply, turbine trip, etc.
第III类工况-稀有事故：该类工况在整个运行寿期内，一般极少发生。例如蒸发器传热管破裂，燃料组件的误装，丧失循环冷却流量等。Type III operating conditions - rare accidents: this type of operating conditions generally rarely occurs during the entire operating life. For example, the evaporator heat transfer tube is broken, the fuel assembly is incorrectly installed, and the circulating cooling flow is lost.
第IV类工况-极限事故(假想)：该类工况在运行寿期内发生概率极低，一般被认为是极不可能发生的事故工况，一旦发生就会释放出大量放射性物质，在设计中必须予以考虑。必须保证安全壳一回路的完整性。例如蒸汽管线破裂，主给水管线破裂，燃料操作事故等。Category IV working condition - extreme accident (hypothetical): This kind of working condition has a very low probability of occurrence during the operating life and is generally considered to be an extremely unlikely accident condition. Once it occurs, a large amount of radioactive substances will be released. must be considered in the design. The integrity of the containment primary circuit must be guaranteed. Such as steam line rupture, main water supply line rupture, fuel handling accidents, etc.
(2)对事故工况是否会造成安全壳环境条件较大变化进行判断(2) Judging whether the accident conditions will cause a large change in the environmental conditions of the containment
对于电厂寿期内可能发生的事故工况，将那些会引起安全壳内质能释放，并导致壳内有明显升温升压变化的工况纳入安全壳正常工况和不利工况条件边界条件分析的范围。For the accident conditions that may occur during the life of the power plant, those conditions that will cause the release of the inner mass energy of the containment and cause significant changes in temperature and pressure in the casing are included in the boundary condition analysis of the normal and unfavorable conditions of the containment. range.
例如：发生汽轮机事故停机或者正常给水流量丧失时，这类工况不会导致安全壳内发生质能释放，此时安全壳内环境条件在正常范围以内；而对于一回路破口失水事故(LOCA)或者蒸汽管道破裂时，大量的质能会释放到安全壳内，导致壳内温度和压力都会升高，这类工况就会造成壳内环境条件的明显变化，此时的安全壳内环境条件属于不利工况范围。For example, when the steam turbine is shut down due to an accident or the normal feed water flow is lost, such conditions will not lead to the release of mass and energy in the containment, and the environmental conditions in the containment are within the normal range; When the LOCA) or steam pipeline ruptures, a large amount of mass energy will be released into the containment, causing the temperature and pressure inside the shell to rise. Ambient conditions are in the range of unfavorable operating conditions.
(3)确定纳入安全壳正常工况以及不利工况的事件(3) Determining the events to be included in the normal and unfavorable conditions of the containment
根据电厂事件发生的频率，将发生频率较高的第I类工况以及第II类工况纳入安全壳正常环境工况范围。对于这两类工况中也会导致壳内质能释放的工况，也要确认安全壳正常工况的环境条件能够对其进行包络；而对于除I类工况和II类工况的其它工况中会造成安全壳内质能释放的工况，均应纳入安全壳不利工况考虑的范围，对应环境条件应包含上述工况下安全壳温度、压力以及辐照条件。According to the frequency of power plant events, Category I and Category II conditions with higher frequency are included in the normal environmental conditions of the containment. For the two kinds of working conditions that also lead to the release of internal mass energy of the shell, it is also necessary to confirm that the environmental conditions of the normal working condition of the containment can envelope it; Other working conditions that will cause the release of the inner mass of the containment shall be included in the consideration of the unfavorable working conditions of the containment, and the corresponding environmental conditions shall include the temperature, pressure and irradiation conditions of the containment under the above working conditions.
(4)分析环境条件对仪表精度的影响(4) Analyze the influence of environmental conditions on the accuracy of the instrument
对于测量仪表，仪表的显示精度应该包含仪表本身精度以及通道所有组件的精度，包括仪表误差，隔离模块误差，I/O模块误差，以及显示仪表误差等。不利工况条件下，测量仪表的误差需要考虑包括温度、压力以及辐照带来的影响。For measuring instruments, the display accuracy of the instrument should include the accuracy of the instrument itself and the accuracy of all components of the channel, including instrument error, isolation module error, I/O module error, and display instrument error, etc. Under unfavorable working conditions, the error of the measuring instrument needs to consider the influence of temperature, pressure and radiation.
(5)分析正常工况与不利工况的环境条件边界值(5) Analyze the boundary values of environmental conditions for normal working conditions and unfavorable working conditions
根据以上分析，安全壳内温度、压力以及辐照可作为安全壳工况的关键环境因素。将安全壳正常运行环境条件纳入安全壳正常工况的范围，将安全壳不利工况下的环境条件纳入对应的安全壳不利工况范围。最后结合安全壳温度、压力、辐照等环境条件对仪表精度的影响，确定正常及不利工况间的边界条件。According to the above analysis, the temperature, pressure and radiation in the containment can be regarded as the key environmental factors of the working condition of the containment. The normal operating environmental conditions of the containment shall be included in the scope of the normal operating conditions of the containment, and the environmental conditions under the unfavorable operating conditions of the containment shall be included in the corresponding unfavorable operating conditions of the containment. Finally, the boundary conditions between normal and unfavorable working conditions are determined according to the influence of environmental conditions such as containment temperature, pressure, and irradiation on the accuracy of the instrument.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若对本发明的这些修改和变型属于本发明权利要求及其同等技术的范围之内，则本发明也意图包含这些改动和变型在内。上述实施方式只是对本发明的举例说明，本发明也可以以其它的特定方式或其它的特定形式实施，而不偏离本发明的要旨或本质特征。因此，描述的实施方式从任何方面来看均应视为说明性而非限定性的。本发明的范围应由附加的权利要求说明，任何与权利要求的意图和范围等效的变化也应包含在本发明的范围内。It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their technical equivalents, the present invention is also intended to include such modifications and variations. The above-described embodiments are merely examples of the present invention, and the present invention may also be implemented in other specific forms or other specific forms without departing from the gist or essential characteristics of the present invention. Accordingly, the described embodiments are to be regarded in all respects as illustrative and not restrictive. The scope of the present invention should be indicated by the appended claims, and any changes equivalent to the intent and scope of the claims should also be included within the scope of the present invention.
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