Overview
IEC 61772:2009 is an international standard published by the International Electrotechnical Commission (IEC) that addresses the application of visual display units (VDUs) in the main control rooms of nuclear power plants. This standard supplements IEC 60964 by providing detailed design requirements and best practices for VDUs, including both individual workstation displays and large screen displays (LSDs) intended for group use or remote viewing.
The 2009 revision of IEC 61772 expands upon the original guidelines to incorporate:
- Use and placement of large screen displays
- Enhanced recommendations for color usage in VDUs
- Improved guidance for back-fit or upgrade applications
- Examples of good practice to aid designers and operators
As nuclear power plant control rooms rely heavily on accurate, clear, and reliable visual information, IEC 61772 plays a critical role in ensuring that VDUs meet stringent requirements for safety, ergonomics, and operational efficiency.
Key Topics
Design Requirements for VDUs
- Purpose and Application: Defines the intended use of VDUs in control rooms, including the number and strategic location of displays for optimal operator access.
- Placement Considerations: Guidance on avoiding glare or lighting issues by proper positioning relative to daylight and artificial light sources.
- User Profiles: Identification of principal users and their specific needs to tailor display design accordingly.
- Failure Criteria: Establishes conditions under which VDU failures must be managed to maintain control room safety.
VDU Display Formats
- Presentation and Legibility: Requirements for clear typography, symbol use, and readable formats to support fast and accurate operator comprehension.
- Consistency and Compatibility: Ensures uniformity between VDU formats and other man-machine interfaces to minimize operator confusion.
- Use of Symbols and Graphics: Recommendations on schematic and mimic style displays to represent plant information visually.
Large Screen Displays (LSDs)
- Purpose and Placement: Advanced considerations for group or distant viewing, emphasizing visibility from multiple operator locations.
- Screen Content and Performance: Design principles for LSD screen layouts, including color use optimized to reduce visual fatigue and enhance clarity.
- Control of Display Changes: Methods to manage how display content updates on LSDs to avoid distractions or misinterpretation.
Verification and Validation
- Procedures to verify that VDU designs meet the outlined requirements and to validate their effectiveness during actual control room operation.
Applications
IEC 61772:2009 is essential for:
- Nuclear Power Plant Operators: To ensure their control room VDUs comply with best practices for safety and efficiency.
- Control Room Designers and Engineers: To guide the layout, design, and implementation of VDUs that provide reliable and ergonomic visualization of plant status.
- System Evaluators and Licensing Authorities: To assess conformity with international safety and usability standards.
- Upgrading Existing Facilities: Providing back-fit solutions that integrate modern VDUs into legacy control rooms without compromising safety.
The standard supports the evolution of control room technology by addressing both new constructions and retrofit projects, making it relevant for modernization programs in the nuclear industry.
Related Standards
IEC 61772 is part of a comprehensive IEC SC 45A series addressing instrumentation and control in nuclear facilities. For cohesive application, it should be used alongside:
- IEC 60964: General design requirements for nuclear power plant control rooms.
- IEC 61513: General requirements for instrumentation and control systems important to safety.
- IEC 61771, IEC 62241, IEC 61839: Additional standards related to control room operation and safety.
- ISO and IAEA Guidelines: For broader nuclear safety and ergonomic standards cross-referenced in IEC documents.
Together, these standards provide a robust regulatory framework for the design, implementation, and maintenance of reliable human-machine interfaces within nuclear power plant control environments.
Keywords: IEC 61772, nuclear power plants, control rooms, visual display units, VDUs, large screen displays, nuclear control room design, VDU standards, nuclear safety, back-fit applications, ergonomic display design