IEC 61497-1998 核电厂 安全重要电器连锁装置 设计和实现的推荐规范

标准号：IEC 61497-1998
中文标准名称：核电厂 安全重要电器连锁装置 设计和实现的推荐规范
英文标准名称：Nuclear power plants - Electrical interlocks for functions important to safety - Recommendations for design and implementation
标准类型：F65
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：F65
国际标准分类号：27.120.20
适用范围：This International Standard provides recommendations for the design and implementation of electrical interlocks used actively or passively to prevent unsafe conditions or to ensure specific safe conditions and states during the operation of nuclear power plants. Safety system interlocks are covered by standards for safety systems. This standard gives design, reliability and test criteria arising from the consideration of interlocks important to safety in accordance with IEC 61226. It uses categories A, B and C as defined by that document. It takes into account the interlock safety significance and functions, and the role of the operator in some interlocks. Guidance is given on redundancy and on diversity of equipment for implementing interlocks, where high availability or integrity is involved, or where common mode failure may limit reliability. The use of computer-based equipment for interlock functions is discussed, and recom-mendations for diversity are given. Requirements for software and for verification and validation are given by reference to IEC 60880. The provision of test facilities is discussed together with self-testing and self-monitoring methods. The system of interlocks for a specific function includes the sensors of plant state (e.g., measuring devices and limit switches), the interlock and control power supplies, the control and instrumentation equipment providing the particular logic function for prevention or limitation of operation, and the cables, electromechanical features, key control and administrative control associated with the function.