Identification of Human-Machine Interfaces

DOE-STD -3009-94

13.4 IDENTIFICATION OF HUMAN-MACHINE INTERFACES

This section summarizes the safety SSCs requiring human- machine interfaces to

function, and the required human- machine interface. These are identified in

conjunction with the results of the hazard analysis and accident analysis in Chapter

3 that identifies safety SSCs. Include human- machine interfaces necessary for the

surveillance and maintenance of safety SSCs during normal operations, and the

human-machine interfaces required for ensuring safety function during normal,

abnormal, and emergency operations. Describe the actions identified so that the

reviewer can understand what the humans are expected to do (i.e., close isolation

valves) and the importance to facility safety of their action (e.g., ens ures

confinement, actuates a protective response system, etc.).

13.5 OPTIMIZATION OF HUMAN -MACHINE INTERFACES

This section summarizes a systematic inquiry into the optimization of human

machine interfaces with safety SSCs to enhance human performance. Che cklists

serve to document the systematic inquiry. Discussions will be proportionate to the

importance to safety and may consider the following design elements:

Furnished instrumentation, provisions for communication and operational

aids to support timely, reliable performance for safety functions.

Layout and design of controls and instrumentation, and provision for

labeling that apply the principles of ergonomics and human engineering.

Work environments, including physical access, need for protective

clothing or breathing apparatus, noise levels, temperature, humidity,

distractions, and other factors bearing upon physical comfort, alertness,

fitness, etc.

Staffing considerations (e.g., minimum staffing levels, allocation of

control functions, overtime restr ictions, facility status turnover between

shifts, procedures, training, etc.).

As necessary, reference documentation existing elsewhere in the DSA (i.e.,

Chapter 12, "Procedures and Training").

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