ML20126C042

Suppl 6 to Human Factors Control Room Design Review of Comanche Peak Steam Electric Station

ML20126C042
Person / Time
Site:	Comanche Peak
Issue date:	12/18/1992
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20126C038	List: ML20126C035 ML20126C042
References
NUDOCS 9212220333
Download: ML20126C042 (5)

Text

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Attachment to TXX-92563 Page 1 of 5 SUPPLEMENT NO. 6 HUMAN FACTORS CONTROL ROOM DESIGN REVIEW OF f

COMANCHE PEAK STEAM ELECTRIC STATION DECEMBER 18, 1992 1

i l

9212220333 DR 921218 i ADOCK 05000445 PDR

! i l Attachment to TXX-92563

) Page 2 of 5 '

i .

l CONTROL ROON ENVIR0 MENTAL SURVEYS

. 1.0 Introduction .

l-l- Control Room and the Remote Hot Shutdown Panel Detailed Control Room i DesignReview(DCRDR)environmentalsurveyswereconductedbyCPSES j personnel and specialists from Stone & Webster Engineering Corporation -

i during December, 1992. The surveys were a combination of requirements covered by CPSES pre-operational tests and NUREG-9700 guidelines. A 4 summary of the results follow with all tests and data available on site.

All HEDs required for fuel load will be resolved prior to Unit 2 fuel load.

I 2.0 8ud1 Lory Environment 1

1 The survey-showed that the acoustic design of the control room ensures

! that verbal communications between operators are not impaired; alarms i are readily detectable and noise distractions, irritation, and fatigue l

are minimized.

f Table 1 summarize > Lhe sound survey results for the NUREG-0700 guidelines. One discrepancy was recorded as noted on the table, j

• HumanEngineeringDiscrepancy(HED 92-2-003)

TheloudnessoftheSafetySysteminoperableIndication(SSil) [

, alarm horn was only 3 dB(A) above background sound level.

Although discernible, the level will be increased for better detection from the Reactor Operator's work station.- The

disposition of the HED and tracking through closure will be l

accomplished by TU Evaluation from TUE 92-6954.

3.0 Illumination i

2 The lighting surveys showed adequate _ levels of-illumination to ensure i that the operator's visual effectiveness is sufficient for task j performance. Both normal (AC) and emergency (DC) lighting systems were surveyed.

l Table 1 summarizes the lighting survey results for the NUREG-0700 guidelines. Two discrepancies were recorded as noted on the table.

• Human Engineering Discrepancy (HED 92-2-004) l

! Certain handswitch module position-indicating lights for the Centainment-Ventilation System utilize-Master Specialties Company 4 (MSC) series 800 which were dimmer than similar MSC lights. This .

hinders the recognition of damper position and whether the lights-have failed. Although-distinguishable close up..the illumination ,

e 4

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Attachment to TXX-92563 Page 3 of 5 will be improved for better recognition. The disposition of the HED and tracking through closure will be accomplished by TUE Evaluation Form TUE 92-6953.

• Human Engineering Discrepancy (HED 92-2-005)

Emergency-lighting desk and central Un (it Supervisor's-Workstation were less than theDC)levelsforU NUREG 0700 guideline minimum of 10 footcandles. In the R0s console area, the DC lighting fixtures have been re-aimed and _

diffusers removed to improve the level to 13.9 foot candles. With the loss of onsite and offsite AC power, the Unit Su)ervisor's-_

emergency activities will be focused on the control )oard/R0s desk area. Lighting required for any tasks in the central administrative area can be accomplished with supplemental portable battery lights available in the control room.

4.0 tientina. Vent 11atina. and- Air Canditionina (HVAC)'

ThethermalcomfortsurveyoftheHotShutdownPanel(HSP)wasevaluated-per MIL-STD-1472C since the HSP area HVAC design is basically for an equipment space. The NUREG-0700 guidelines for control room personnel comfort do not apply. The MIL-STD-1472C, " effective temperature" for winter ccmfort zone is 65-70*F. Effectivetemperature(ET)takesthe ,

effect of temperature; humidity, and air velocity into consideration for comfort. .The average IT for the HSP area was 66.4*F. For summer cooling the effective temperature should be below 85'F, which is considerably above the NUREG-0700 guideline for the control room.

The Control Room HVAC was surveyed but the temperature was not maintained'within the comfort zone.

Table 1 summurizes the HVAC survey results. One discrepancy was recorded as noted on the table.

HumanEngineeringDiscrepancy(HED 92-2-006)

The temperature of the control room was slightly below the comfort zone. The disposition of'the HED and tracking through closure will be accomplished by Operations Notification and Evaluation (ONE) Form ONE 92-873.

4

Attachment to TXX-92563

. Page 4 of 5 '

1.

TABLE 1 1

NUREG-0700 GUIDELINE CONFORMANCE 6.1.5.1 TEMPERATURE AND HUMIDITY (Note 3)

a. Comfort Zone No-HED 92-2-006 4

b. Temperature Differential Yes 1

4 6.1.5.2 VENTILATION

a. Air Quantity Yes

b. Air Velocity Yes 6.1.5.3 ILLUMINATION

a. Levels Yes

b. Uniformity Yes

c. Sup)1ementh1 Light N/A

d. Tast Area Luminance Ratio Yes

e. Shadowing _Yes

f. Glare Yes (Note 1)

g. Reflectance Yes (Note 2)

h. Color Yes 6.1.5.4 EMERGENCY LIGHTING

a. Automatic Action Yes

b. Limit Yes

c. Lighting Levels No-HED 92-2-005 6.1.5.5 AUDITORY ENVIR00 MENT t

a. Background Noise Yes

b. Limit Yes

c. Further Reductions Yes

d. Noisa Distractions Yes .

e. Deverberation Time Yes 6.2.2.3 AUDITORY C0 DING TECHNIQUES

, a. Distinctive Coding Yes

b. Pulse Coding .Yes

c. Frequency Change Coding Yes

d. Discrete Frequency Coding Yes

e. Coding By Intensity Yes

6.2.2.5 FREQUENCY

a. Range Yes

b. Bandwidth Yes 6.2.2.6 SIGNAL INTENSITY

a. General No-HED 92-2-003

b. Comfort Yes

c. Maximum Intensity Yes 6.3.2.1-- SIGNAL DETECTION

a. Signal Intensity No-HED 92-2-003 6.5.3.1 CHARACTERISTICS AND PROBLEMS OF LIGHT INDICATORS .

a.. ... Unambiguous Sensing...- No-HED 92-2-004

Attachment to 1XX-92563

. Page 5 of 5 q MQlf3

1. Glare was noted on the curved surfaces of some vertical VX 252 indicators and plexiglass paper guides within several chart recorders. Although visible, the glare did not interfere with the operator's ability to read the engineering units. scale markings, or the association of pointer position with operating color bands when viewed from the normal viewing positions.

2. The control room utilizes two carpet patterns, a striped center area and a solid

, blue border adjacent to the boards to depict the floor area where only licensed operators are permitted. The striped carpet met the reflectance guideline, but the solid blue did not. This minor variance is offset by the effectiveness of the blue boundary and the contrasting high reflectance of the surrounding control board sand-tan color.

3. HSP evaluated per MIL-S10-1472C.

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