Overview
IEC 62566:2012 sets requirements for the development of HDL-programmed integrated circuits (HPDs) used in instrumentation and control (I&C) systems at nuclear power plants, specifically for safety category A functions as defined by IEC 61226. These HPDs - commonly implemented using FPGAs or similar micro-electronic technologies - are programmed via Hardware Description Languages (HDL) and associated software tools. The standard defines a robust, structured life-cycle process to ensure the high reliability and fault tolerance necessary for safety-critical applications in nuclear facilities.
Key Topics
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Dedicated Development Life-cycle
- Specification of requirements
- Design and implementation phases
- Verification, integration, and validation steps
- Management of modifications and controlled production
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Selection and Qualification of Components
- Assessment and selection of blank integrated circuits (such as FPGAs)
- Use of Pre-Developed Blocks (PDBs), libraries, and macros
- Justification and documentation of component acceptance
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Design Principles
- Emphasis on deterministic and simple architectures
- Defensive design to enhance fault detection and toleration
- Application of synchronous versus asynchronous design rules
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Tool and Software Requirements
- Controls for selection and use of development, simulation, and verification tools
- Requirements for tool qualification and documentation
- Automation and code generation best practices
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Verification and Validation
- Detailed verification plans and review processes
- Design reviews, test benches, and coverage analysis
- Traceability and documentation for system integration and system validation
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Modification and Configuration Management
- Procedures for change control throughout the HPD lifecycle
- Requirements for documenting modifications and their rationales
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Common Cause Failure (CCF) Defenses
- Approaches to limit system susceptibility to single and common-cause failures
- Guidance on documentation to support CCF analysis
Applications
IEC 62566:2012 is essential for organizations involved in nuclear power plant I&C system design, operation, and regulation, including:
- Designers and Engineers: Guidance for developing and verifying new or modified programmable logic devices (such as FPGAs) for the highest safety category.
- Nuclear Plant Operators (Utilities): Assists in overseeing, commissioning, and maintaining I&C systems that rely on HPDs.
- Regulatory Authorities: Provides criteria and framework for evaluating the safety and compliance of programmable logic in nuclear applications.
- Component Manufacturers: Supplies detailed expectations for the documentation and qualification of components intended for use in category A I&C systems.
Adopting IEC 62566 helps ensure a structured and transparent approach to HPD development, supporting robust safety justifications and international harmonization. It is particularly valuable when new technologies or design techniques are introduced, allowing for the application of established safety principles regardless of specific technology changes.
Related Standards
IEC 62566 references and complements several other key standards for nuclear power plant I&C systems:
- IEC 61226: Categorization of functions and classification of systems
- IEC 61513: General requirements for I&C systems important to safety
- IEC 60880 and IEC 62138: Software aspects for computer-based systems (category A, B, and C functions)
- IEC 60987: Hardware design requirements for computer-based systems
- IEC 62340: Measures for common cause failure
- IEC 60780 / IEC 62342: Environmental qualification and reliability considerations
International best practices and terminology align with guidelines from organizations such as IAEA and ISO to ensure broad compatibility and acceptance across different jurisdictions in the nuclear sector.
Keywords: IEC 62566, nuclear power plant, instrumentation and control, FPGA, HDL-programmed device, safety category A, common cause failure, hardware description language, verification, validation, integrated circuits, nuclear industry standards.
Open preview (PDF)Nuclear power plants - Instrumentation and control important to safety - Development of HDL-programmed integrated circuits for systems performing category A functions
