ML20198B132

Issue a to DD-KEY-1, Design Directive for Keyboards

ML20198B132
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/29/1983
From:	PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20198B035	List: ML20198B030 ML20198B069 ML20198B073 ML20198B090 ML20198B123 ML20198B132 ML20198B141 ML20198B146 ML20198B152
References
DD-KEY-1, NUDOCS 8511060301
Download: ML20198B132 (5)

Text

PUBLIC SERVICE COMPANY OF COLORADO FORT ST VR AIN NUCLE AR GENERAilNL ST ATION DD-KEY-1 ISSUE A Page 1 of 5 DESIGN DIRECTIVE FOR KEYBOARDS PR D SY: REVIEWEDBy APPROVED BY:

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vu FOREWORD: The keyboard is the method through which the operator communicates to the computer. It must be configured to support the operator without imposing upon the task to be performed.

Certain characteristics serve to enhance the man / machine interaction while others may degrade the operators success in retrieving and interpreting the cesired information. This design directive defines tnose keyboard selection consicerations which support effective operator utilization of the comoater capabilities. If a keyboard is being selected as part of a totally new operating position, three (3) additional design directives, listed under " Associated Directives" should be consulted.

SELECTION CONSIDERATIONS .

I. KEYBOARDS A. Alpha-Numeric Keyboard Arrangement - Keyboards that combine alphabetic and numeric functions in a single keyboard shall conform to tne standard "QWERTY", as shown in figure 1.

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@E R T@U I 0 P l LOCK l A S D F G hJ K L l LOCK l fl M  ;  ?/ $HIFTl lSHIFTl Z X C V B .

l SPACE BAR l FIGURE I B511060301 851029 PDR ADOCK 05000267 F PDR FORM 372 22- 3643

PUBLIC SERVICE COMPANY OF COLORADO PORT ST VR AIN NUCLE AR GENE R ATINU ST ATION ISSUE A Page 2 of 5 B. Numeric Keyboard Arrangement - The configuration of a keyboard used to enter solely numeric data shall be a 3 x 3 + 1 matrix, " calculator" style as shown in figure 2.

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1 2 3

{ 0 l FIGURE 2 C. Keyboard Slope - Keyboards shall have a slope between 15 and 25 from the horizontal as shown in

, figure 3.

- - 25 (maximum)

} , -1516(minimum)

- -17 (optimum) j i- p FIGURE 3 D. Key Measurements - To maximize the effectiveness of keyboards, key dimensions and separation shall be as illustrated. (Figure 4) f-3-

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Ss Key Dimension Key Separation (D) (S)

(inches) (inches)

Minimum 0.335 0.25 Maximum 0.75 Preferred 0.5 0.25 FIGURE 4 F ORM 372 3643

PUBLIC SERVICE C OMPA N Y OF COLORADO FORT ST VR Al'. Nu LL Ar. C ENE R AilNL ST ATIO*.

DD-KEY-1 ISSUE A Pace 3 of 5 E. Key Displacement and Resistance - To orovide positive key movement feedback to the operator, and to recuce inadvertent activation of keys. Key resistance and displacement snail be as shown in the following tabulations.

Resistance (cuaces)

Alpna-Numeric numeric Minimum 1.5 0.9 Maximum 14.0 6.3 Displacemer.: (inches)

Alpna-Numeric numeric Minimum 0.03 0.05 Maximum 0.19 0 . I.5 F. Use of Multiple Keyboards - All computer system keyboards serving the same function and located within a single control area shall have the same key assignment configuration.

G. Positive Indication - To provide positive key actuation feedback to the operator, a definite indication should be provided (e.g., snap, feei, audible click, release of resistance).

H. Visual Feedback - Data being entered via keyboards shall be displayed as it is keyed.

I. Relevant Keys - All keys net normally utilized by control room operators snall ce easily identifiable as such, either by placement, color, or iabeling.

II. COMPUTER FUNCTION CONTROLS Function controls may encompass a variety of control types, from selector switches to " typewriter" keys dedicated to certain computer functions, CRT parameters, operator responses, or choices. Computer function controls shall conform to the following as applicable.

FORM 372- 22 36&3

PUBLIC SERVICE COMPA NY OF COLORADO PORT ST VRti' NUCLE AR GENE R ADNG STATION gg g ,y ISSUE A Page 4 of 5

_A . CONTROL DESIGN

1. Keys and/or keyboards used for selection of computer or display functions or modes shall conform to the requirements of section I of this design directive.

2. Special controls (switches, knobs, handwheels, anc etc.) used for selection of computer or display functions or modes shall conform to the requirements of design directive CTL-1.

B. LABELING AND NOMENCLATURE

1. Symbols, acronyms, and abbreviations used on function controls shall ;a the same as, or consistent with the terms, nomenclature, and abbreviations of tne computer function which is selected or displayed.

2. Terms, nomenclature and abbreviations used on function controls, which describe plant functions, systems, or parameters shall be in accordance with Design Directive AAS-1.

(Abbreviation and acronym selection).

C. FUNCTION CONTROLS

1. Each function control should be clearly labeled to indicate its function to the operator.

2. Controls providing or serving the same function on different consoles in the same operating area shall be identical.

3. Control keys shall be functionally separate from alpha-numeric keys. (Avoid multiple-mode keyboards whicn utilize the same keys for both alpha-numerics and functions by using " shift" keys or mode selection controls).

FORM 372 22- 3643

-1 PUBLIC SERVICE COMPA N Y OF COLORADO FORT ST VR AIN NUCLE AR GENER ATING STATION gg, g ,y ISSUE A Page 5 of 5 ASSOCIATED DIRECTIVES DD-DD Requirements and Guidance for Preparing Design Directives DD-CRL Cathode Ray Tube Location DD-SLS Screen Layout and Structuring CD-CON Consoles DD-AAS Abbreviation anc Acronym Selection SOURCE MATERIALS AND REFERENCES NUREG - 0700 Human Factors in Engineering, McCormick, 1976 FORM 372- 22 3643