IEC 62138:2018

IEC 62138:2018 is a technical reference for software aspects of computer-based systems performing category B or C functions in nuclear power plant instrumentation and control systems important to safety. It is relevant when organizations need to evaluate how software is specified, developed, verified, and controlled within safety-related plant systems. For engineering, procurement, and compliance teams, IEC 62138:2018 helps define a focused basis for technical review, documented evaluation, and risk management in a nuclear safety context.

IEC 62138:2018 standard overview

This edition addresses the software dimension of computer-based systems used for safety-significant instrumentation and control functions in nuclear power plants. Its scope is especially relevant where category B or C functions require disciplined engineering documentation, verification activities, and consistent lifecycle control. In practical terms, the document supports technical assessment of software-related requirements, development processes, and validation expectations so that teams can align design decisions with safety objectives and compliance workflows.

Applications of IEC 62138:2018

IEC 62138:2018 is commonly used in nuclear plant engineering, system integration, safety case preparation, and procurement review for computer-based control and monitoring equipment. It can also support laboratory evaluation, software quality assurance, and conformity assessment activities where traceable documentation is needed for safety-related functions. Organizations may use it to structure reviews of engineering specifications, verification records, and operational consistency across software lifecycle stages tied to plant instrumentation and control systems.

Why IEC 62138:2018 matters

For nuclear safety projects, the value of IEC 62138:2018 lies in helping teams reduce software-related uncertainty and maintain defensible compliance practices. It supports more consistent testing workflows, clearer technical validation, and better alignment between design intent and implemented function. That can improve readiness for regulatory preparation, procurement qualification, and internal quality checks. When software supports category B or C safety functions, a focused compliance reference helps organizations manage risk and strengthen confidence in engineering documentation.

• Software-focused guidance for computer-based systems used in nuclear safety-related instrumentation and control
• Relevant to category B and C functions where documented verification and validation are important
• Useful for engineering specification review, quality workflows, and compliance preparation
• Supports procurement and assessment activities involving safety-significant plant control systems