IEC 60709:2018

IEC 60709:2018 addresses the separation of instrumentation, control and electrical power systems important to safety in nuclear power plants. For engineering teams, it serves as a technical reference when reviewing how safety-related systems are arranged to limit common-cause effects and support dependable operation. IEC 60709:2018 is relevant to design review, documented evaluation, procurement checks, and compliance workflows where physical or functional separation has a direct impact on safety case credibility and operational consistency.

Purpose of IEC 60709:2018

The purpose of this document is to provide guidance and requirements for separating systems that are important to safety so that a single fault, event, or dependency does not unduly affect multiple safety functions. In practice, it supports technical assessment of architecture, routing, placement, and segregation decisions for instrumentation, control, and power systems. It is commonly used during engineering documentation review and conformity assessment preparation to help demonstrate that safety functions are protected through appropriate separation measures.

Compliance applications of IEC 60709:2018

IEC 60709:2018 is typically consulted during nuclear plant design changes, retrofit planning, safety system integration, and verification activities involving control and power distribution arrangements. It may also support laboratory evaluation, system-level technical validation, and procurement review where separation requirements must be stated clearly in an engineering specification. Compliance teams may use it to check whether layouts, interfaces, and dependencies align with regulatory preparation and technical compliance expectations for safety-important equipment.

Benefits of IEC 60709:2018

Using IEC 60709:2018 can improve safety-focused design decisions by helping organizations manage segregation, reduce shared vulnerabilities, and strengthen risk management across critical systems. It also supports more consistent testing workflows and documented evaluation, especially when multiple safety functions must remain independent under credible fault conditions. For procurement and quality assurance teams, it provides a clearer basis for technical review, supplier assessment, and verification that separation provisions are addressed in the delivered solution.

• Supports separation of safety-important instrumentation, control, and power systems in nuclear power plant applications
• Helps structure engineering reviews around segregation, independence, and common-cause vulnerability reduction
• Useful for compliance workflows involving design documentation, verification activities, and conformity assessment
• Assists procurement and supplier review when separation requirements must be defined in technical documentation