ML20093A508
| ML20093A508 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/30/1984 |
| From: | TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML20093A506 | List: |
| References | |
| NUDOCS 8407100583 | |
| Download: ML20093A508 (16) | |
Text
_
a.
(
i SUPPLEMENT N0. 2 i
l I
t i
T HUMAN FACTORS CONTROL ROOM DESIGN REVIEW l
OF j
COMANCHE PEAK STEAM ELECTRIC STATION JUNE 1984 i
I i
t I
i g o!h4]5 D
4 PDR
[
s ABSTRACT Supplement 2 to the Human Factors Control Room Design Review of Comanche Peak Steam Electric Station provides resolution to the only open issue following the submittal of Supplement 1 in March 1984.
This issue is the environmental, lighting and noise surveys at the Hot Shutdown Panel. Revised resolutions are also provided for HED Control No. 335 and HED Control No. 62.
s SUPPLEMENT 2
i e
TABLE OF CONTENTS 6.0 INCOMPLETE TASKS 6-1 6.2 NOISE, LIGHTING AND ENVIRONMENTAL SURVEYS 6-1 APPENDIX A HED ORGANIZATION AND CROSS REFERENCES A-1, A-2 APPENDIX B HED SUMMARIES B-1 2.0 WORKSPACE HEDS HED 335 Revised HED 354 New 6.0 VISUAL DISPLAY HEDS HED 62 Revised APPENDIX J HOT SHUTDOWN PANEL ENVIRONMENT J-1 1.0 METHODOLOGY J-2 2.0 SURVEY RESULTS J-2 2.1 Noise Survey J-2 2.2 Lighting Survey J-2 2.3 Environmental Survey J-2 SUPPLEMENT 2 ii
\\
6.0 INCOMPLETE TASKS 6.2 NOISE, LIGHTING AND ENVIRONMENTAL SURVEYS All required surveys have been completed.
In addition, noise, lighting and environmental surveys have been completed at the Hot Shutdown Panel (HSP). A discussion of the environment at the Hot Shutdown Panel is presented in Appendix J.
All new HED's resulting from the HSP surveys are included in this supplement.
k 9
SUPPLEMENT 2 6-1
8 e
\\
APPENDIX A HED ORGANIZATION AND CROSS REFERENCES 4
SUPPLEMENT 2 A-1
F t
APPENDIX A HED ORGANIZATION AND CROSS REFERENCES HED CONTROL APPENDIX B SECTION NO.
2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 62 62 335 335 354 354 F
?
e SUPPLEMENT 2 A-2
I o
APPENDIX B HED SUMMARIES L
i SUPPLEMENT 2 8-1
(
a e
\\
g 2.0 WORKSPACE HEDS l
i SUPPLEMENT 2
i HED CONTROL NO. 335 i
A.
HED DESCRIPTION The oblique angle from the operator's line of sight to the plane of the outboard annunciators is less that 450 from several control stations. This contributes to poor readability, especially on panels CB-09, CB-11, and CV-01.
In the case of CV-01, many annunciators cannot be read at all from the control station.
B.
GUIDELINE REFERENCE
[
NUREG-0700:
6.1.2.2.e.(2)
C.
LOCATION CB-09,11,CV-01 D.
POTENTIAL SAFETY CONSEQUENCES 1.
Failure to respond to alarm 2.
Possible equipment damage due to delayed response time.
E.
~ ASSESSMENT PROCESS r
1.
Evaluated readability of far left/right annunciator tiles from annunciator control station.
2.
Evaluated feasibility of relocating controls stations to increase viewing angle.
3.
Evaluated feasibility of adding control stations in an area such that viewing angle would be 450 4.
Evaluated feasibility of moving annunciator tiles to a more readily viewable position.
SUPPLEMENT 2
F.
BACKFIT JUSTIFICATION 1.
CPSES realizes that the viewing angles are acute and that it'affects the operators ability to read the legends on the outboard columns of the annunciator matriccs of the annunciators on CB-09, CB-11, and CV-01 from their respective annunciator-control stations.
The viewing angles on CB-09 and CB-11 were re-evaluated and, in particular, operators were consulted.
It h_ our conclusion that the problem does not affect the operator's ability to respond to those alarms in a timely manner.
2.
For CV-01, a second annunciator control station will be added for the control of X-ALB-11C. The original control station will control 1-ALB-11A and 1-ALB-118.
i h
u SUPPLEMENT 2
F J
HEDCONTROLN0. 354 A.
HED~ DESCRIPTION The effective temperature at the HSP was not maintained within the comfort range.
B.
GUIDELINES REFERENCE NUREG-0700: 6.1.5.1.a l
C.
LOCATION Hot Shutdown Panel D.
P0TENTIAL SAFETY CONSEQUENCES None E.
ASSESSMENT PROCESS t
Environmental Survey
(
F.
BACKFIT None G.
JUSTIFICATION Since the Hot Shutdown Panel (HSP) is not a normally manned panel, the design criteria applied is not the same as the Main Control Room. Per the design criteria, the peak temperature is 1040F and an average temperature of 900F can be maintained over a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period. The estiinated length of time that will require operators at the HSP is 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
Since the data taken during the environmental survey supports this original design, CPSES feels that the HVAC at the HSP is sufficient.
SUPPLEMENT 2
4 f
a 1
6.0 VISUAL DISPLAY HEDS l
4 s
6 t
SUPPLEMENT 2
HED CONTROL N0. 62 A.
HED DESCRIPTION The scales of two related meters do not have compatible numerical progression and scale range. Scale increments are different and number of graduations are different.
B.
GUIDELINE REFERENCE NUREG-0700:
6.5.1.5.d.
C.
LOCATION CB-08 0.
POTENTIAL SAFETY CONSEQUENCES 1.
Failure to identify causes for loss of feedwater.
2.
Inability to control f13edwater.
3.
Plant shutdown.
E.
ASSESSMENT PROCESS The meters' function and their relationships were evaluated.
F.
BACKFIT Meters will be changed to 200-1500 PSIG linear displays.
SUPPLEMENT 2
8 C
t 9
APPENDIX J HOT SHUTDOWN PANEL ENVIRONMENT SUPPLEMENT 2 J-l
HOT SHUTDOWN PANEL ENVIRONMENT 1.0 METHODOLOGY The environmental surveys at the Hot Shutdown Panel were conducted in accordance with the methodology, as appropropriate, of Appendix H.
t 2.0 SURVEY RESULTS P
2.1 Noise Survey The background noise levels at the Hot Shutdown Panel were in the range of 70 dB(A) and did not exceed 90 dB(A).
No HED's resulted from this survey.
2.2 Lighting Survey With one train of AC lights and the DC lights on (the lighting expected in this emergency situation), light L
levels of at least 32 footcandles were recorded.
No HED's resulted from this survey.
2.3 Environmental Survey The Hot Shutdown Panel'is an emergency operating station which is not normally manned.
As such, it is not necessary to maintain the environment of the Hot Shutdown Panel within the comfort zone required for the Control Room. The environment should be maintained at a level that will allow the operator to adequately perform his remote shutdown tasks.
The area where the Hot Shutdown Panel is located is a normally air conditioned electrical area with very few J-2 SUPPLEMENT 2
4
-s heat sources. The peak temperature in this area is 920F (based on the outdoor summer design temperature of 1020F).
An average temperature of 900F can be maintained over a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period. These numbers are based on conservative, worst-case type Analyses.
In reality, the temperatures in the vicinity of the Hot Shutdown Panel are expected to be much less and the humidity is expected to be relatively low, as is characteristic of North-Cantral Texas summer.
In the worst case fire, ventilation in the area of the Hot Shutdown Panel could be lost but several of the few heat sources would also be lost.
In this situation, during the summers, temperatures at the panel are expected to remain in the eighties or possibly the low nineties with fairly low humidities.
Considering the nature of the emergency (a fire requiring evacuation of the control room and plant shutdown /cooldown), which will keep the constant attention of the operator, and the short duration of the event (completion expected in about 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />), these environmental conditions are considered adequate to allow the operator to perform his required tasks.
The expectation temperatures are supported by our survey results. Some of these results are tabulated below.
DATE TIME REL. HUMIDITY TEMPERATURE OUTSIDE COMMENT 5-11-84 3PM, 50%
880 Peak HVAC status 6PM 44%
890 5:50 PM - 920 Not recorded 9PM 44%
890 5-11-84 5-12-84 3AM 54%
880 9AM 56%
860 6:20 PM - 920 3PM 50%
90 0 5-12-84 y
SUPPLEMENT 2 J-3
. 18-84 12 (Noon) 44%
930 3PM - 970 HVAC 0FF 3PM 40 %
940 6PM 39%
93 0 9PM 40 %
920 6-19-84 12 (Mid) 41%
920 4:30PM - 980 3AM 44%
940 6AM 44%
940 9AM 42%
940 12 (Noon) 39%
940 3PM 40%
940 6PM 40 %
930 9PM 41%
930 6-20-84 12 (Mid) 42%
930 4:00PM - 980 3AM 43%
940 6AM 43%
940 9AM 44%
940 lf 12 (Noon) 40%
940 HVAC ON 3PM 38%
940 6PM 36%
940 9PM 37%
940 6-21-84 12 (Mid) 41%
940 4:00PM - 1000 3AM 45%
940 6AM 46%
930 9AM 46%
940 12 (Noon) 36%
940 y
SUPPLEMENT 2 J-4 L.