标准摘要
[中文适用范围]： 本文件规定了执行安全类别B或C功能的计算机化仪表和控制(I&C)系统软件的要求，如IEC 61226所定义。它补充了IEC 60880和IEC 60880-2，后者提供了执行安全类别A功能的计算机化I&C系统软件的要求。 本文件也与IEC 61513一致并互为补充。主要是系统级别的活动（如集成、验证和安装）未在本文件中详尽阐述：非特定于软件的要求留待IEC 61513处理。 本文件考虑了I&C系统软件的当前实践，特别是： - 使用不一定按照核工业部门标准设计的预开发软件、设备和设备系列； - 使用带有嵌入式软件的专用"黑盒"设备； - 使用面向应用的语言。 本文件不打算用作通用软件工程指南。它提供了适用于安全类别2或3的I&C系统软件的要求，这些要求必须满足以实现新核电站的系统核安全目标，以及现有电站的I&C升级或改造。 对于现有电站，仅适用一部分要求，这部分要求必须在项目开始时确定。 本文件提供的指导目的是尽可能减少潜在的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（即由于软件导致的共同原因故障）。 本文件未明确说明如何保护软件免受恶意攻击的威胁，即计算机系统的网络安全。IEC 62645提供了计算机系统安全计划的要求。 [外文原描述]： IEC 62138:2018 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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