GB/T 9225-1999 in English

本标准是为核电厂安全系统的设计和运行人员以及有关管理部门提供用于核电厂安全系统可靠性工程的一般方法和步骤。本标准适用于定性和定量地分析核电厂安全系统的可靠性，也适用于定性和定量地分析与安全有关的核电厂系统的可靠性。本标准的定性、定量分析原理适用于分析部件故障对系统可靠性的影响。本标准适用于核电厂安全系统寿期的任何阶段，但在设计阶段，对提高安全性的作用最大。分析结果将有助于作出可靠的系统设计，有助于系统评价。在预运行阶段和系统的正常寿期，运用本标准将有助于准备和修订运行、维修规程和改进试验计划。

Scope

This standard is applicable to the qualitative and quantitative analysis of the reliability of the safety system of nuclear power plants, and also to the qualitative and quantitative analysis of the reliability of safety-related nuclear power plant systems. This standard applies to any stage of the life cycle of the safety system of nuclear power plants, but in the design stage, it has the greatest effect on improving safety. The analysis results will help to make a reliable system design and contribute to system evaluation. During the pre-operational phase and during the normal life of the system, application of this standard will assist in preparing and revising operating and maintenance procedures and improving test plans.