IEC 61227 pdf download – Nuclear power plants – Control rooms – Operator controls

IEC 61227 pdf download – Nuclear power plants – Control rooms – Operator controls
1 scope
This International Standard supplements lEC 60964 which applies to the design for controlrooms of nuclear power plants. it identifies the Human-Machine Interface (HMI) 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, lEC 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. If 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.
2Normative references
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:
3.1
discrepancy control and indication
binary control with state and discrepancy indication using a single control switch
3.2
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
3.3
multiplexed
used for several purposes at different times. For example, a start-stop switch may be selectedby another device associated to a number of plant items and used to start or stop the item towhich it is connected at the time
3.4
operator controls
devices which the operator uses to send demand signals to control systems and plant items
3.5
semaphore
electrically driven mechanical device which displays the plant condition (e.g. open or closedswitch position) by the angular position of the visible surface
3.6
soft control
control device for input of operator commands，that has connections with the control systemthat are mediated by software rather then direct physical connections. As a result,thefunctions of a soft control may be variable and context dependent rather than staticallydefined.
NOTETypically， soft control devices use VDuUs for displaying the input options，and pointing devices such astrack ball，mouse,touch capability, or light pen for the selection of the choice.
3.7
touch panel
soft control which uses a position detector to detect the operator’s finger pointing at the labelon the vDu (Visual Display Unit).Alternatively, a light pen may be used or a cursor may bemoved over the VDU format to identify a label.The label may describe an item of plant or acontrol action.
4Design principles
4.1 Basic concepts
An overall systems design approach is required for the design of the HMI.IEC 60964 statesthe requirements for overall design of the control room system and the establishment of theprinciples required for safety, availability and user considerations,and the functional design ofthe system as a whole.The designer shall consider his goals,and the relative importance ofthe various design factors for his particular application.