IEC 61227 pdf download Nuclear power plants – Control rooms – Operator controls
This International Standard supplements lEC 60964 which applies to the design for controlrooms of nuclear power plants. it identifies the Human-Machine Interface (HMl) requirementsfor discrete controls，multiplexed conventional systems, and soft control systems. For themain control room of a nuclear power plant,IEc 60964 includes general requirements forlayout，user needs and verification and validation methods，and these aspects are notrepeated in this standard.However,IEC 61772 on Visual Displays Unit (VDU) also providessome guidance on displays and indications where necessary for the correct application of thecontrol requirements.
This standard is intended for application to the design of new main control rooms in nuclearpower plants designed to lEC 60964 where this is initiated after the publication of thisstandard. lf it is desired to apply it to supplementary control points or local control positions,or to existing control rooms or designs，special caution shall be exercised as it makesassumptions such as the automation level that may not apply.
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60073,Basic and safety principles for man-machine interface,marking and identification- Coding principles for indicators and actuators
IEc 60964,Nuclear power plants – Control rooms – Design of main control room
IEC 61771,Nuclear power plants – Control rooms – Verification and validation of designIEC 61772,Nuclear power plants – Control rooms – Application of visual display units (VDu)
IAEA Safety guide NS-G-1.3:2002,Instrumentation and Control Systems lmportant to Safetyin Nuclear Power Plants
3Terms and definitions
For the purposes of this document,the terms and definitions given in IEC 60964 and thefollowing definitions apply:
discrepancy control and indication
binary control with state and discrepancy indication using a single control switch
discrete (individual) controls
devices to support operator control of plant components,such as pumps,valves,controllers,with one control being assigned to a single plant component or function
4 Design principles
4.1 Basic concepts An overall systems design approach is required for the design of the HMI. IEC 60964 states the requirements for overall design of the control room system and the establishment of the principles required for safety, availability and user considerations, and the functional design of the system as a whole. The designer shall consider his goals, and the relative importance of the various design factors for his particular application.
Operator controls shall be designed so that operators can perform their tasks easily and correctly. Consideration shall be given to control-display integration and the type of operating procedure and its presentation shall be taken into account in the choice of controls to be used. Particular attention shall be given to the needs of the operator for simple error-proof systems that will optimize the operator’s performance under all conditions. Their design shall be based on ergonomic principles to ensure ease of operation and to minimize operators’ errors, both of omission and execution. Where conventional systems are used, mechanical characteristics of control elements, such as size, operating pressure or force, tactile feedback, etc., shall meet human capabilities and characteristics specified in the anthropometric data base.