标准摘要
[中文适用范围]: 本文件规定了执行 IEC 61226 定义的安全类别 B 或 C 功能的基于计算机的仪器和控制 (IC) 系统的软件要求。它补充了 IEC 60880,后者提供了执行功能的基于计算机的 IC 系统的软件要求安全类别 A。它与 IEC 61513 一致并补充。本文件并未详尽地阐述主要是系统级活动(例如集成、验证和安装)的活动:不特定于软件的要求遵循 IEC 61513。IEC 61513 中给出了功能类别和系统类别之间的联系。由于给定的安全分类 IC 系统可以执行不同安全类别的功能,甚至可以执行非安全分类功能@,因此本文件的要求附在IC 系统的安全等级(2 级或 3 级)。本文档无意用作通用软件工程指南。它适用于新建核电站安全等级2或3的IC系统软件以及现有核电站的IC升级或后装。对于现有工厂@,只有一部分要求适用,并且必须在任何项目开始时确定该子集。本文档提供指导的目的是尽可能减少潜在软件故障导致系统故障的可能性,无论是由于单个软件故障还是多个软件故障(即由软件引起的共因故障)。本文档没有明确说明如何保护软件免受恶意攻击@即基于计算机的系统的网络安全@产生的威胁。 IEC 62645 提供了对基于计算机的系统的安全程序的要求。 [外文原描述]: IEC 62138:2018 specifies requirements for the software of computer-based instrumentation and control (I&C) systems performing functions of safety category B or C as defined by IEC 61226. It complements IEC 60880 which provides requirements for the software of computer-based I&C systems performing functions of safety category A. It is consistent with, and complementary to, IEC 61513. Requirements that are not specific to software are deferred to IEC 61513. This new edition includes the following significant technical changes with respect to the previous edition: - align the standard with standards published or revised since the first edition, in particular IEC 61513, IEC 60880, IEC 62645 and IEC 62671; - merge two clauses in order to avoid repetitions of text; - introduce requirements on traceability in consistency with IEC 61513; - introduce new annexes.
英文名称Nuclear power plants - Instrumentation and control systems important to safety - Software aspects for computer-based systems performing category B or C functions