ML20237G892
| ML20237G892 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 08/07/1987 |
| From: | Hunsader S COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| 3433K, NUDOCS 8708140243 | |
| Download: ML20237G892 (2) | |
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9-
.!/~~l Commonwealth Edison
{ / One Firnt Nttional Plaza, Chicago, Illinois bs Addrzss R1 ply to: Post Office Box 767 Chicago, Illinois 60690 0767 -
August 7, 1987 Mr. Thomas E. Murley,. Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Braidwood Station Unit 1 Detailed Control Room Design Review Environmental Survey NRC Docket No. 50-456 Reference (a): November 26, 1986 K.-A. Ainger letter to H..R. Denton
Dear Mr. Murley:
Reference (a) provided the Commonwealth Edison Co. Byron and Braidwood Stations' Detailed Control Room Design Review (DCRDR) Final Summary Report which addressed an environmental survey that had been performed. This letter provides, in Attachment A, the results of a more recent environmental survey performed during May 22-25, 1987, for Braidwood Station Unit 1.
This is being provided to supplement the information previously submitted concerning the DCRDR.
Please address any questions concerning this matter to this office.
Very truly yours, 0
= :,&
S. C. Hunsader l
Nuclear Licensing Administrator l
l cc:
J. Stevens Braidwood Resident Inspector 0
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B708140243 870807 PDR ADOCK 05000456 P
PDR 4
Attachment A Braidwood Unit 1 Temperature, Humidity, and Air Velocity Survey of May, 1987. Summary of Results.
1 Environmental measures were'taken at the Braidwood Unit 1 Control Room during May 22 - May 25, 1987. Air velocity was measured on May 22-(am).
Temperature.and humidity measures were obtained on a continual basis.over May 22 - May 25.
Procedures used to collect the data are described in the Byron /Braidwood Detailed Control Room Design Final Summary. Report.(Vol. 1, December 1, 1986). The results of the measurements are described below:
Air Velocity Air velocity measures were taken at each control board panel and at the unit, console, and center desks. At each location, four ventilation directions (north, south, east, west) were obtained.
Readings were taken at 4 feet and at 6 feet above floor level. The HVAC was running at the time of observations.
Air velocity measurements complied with human factors guidelines.
Air velocities were less than 45 feet per minute. Deviations were within acceptable limits.
Temperature and Humidity Temperature and humidity were recorded over four days.
Two hygrothermographs'were set at floor level and at 3 feet.
Temperature readings over the four days were typically from 20* C to 21' C, for both floor level and 3 feet. However, the temperature readings for May 22 (pm) and for May 23 showed fluctuations-from 19 to 25* C for 3 feet, and from 19 to 29* C for floor level.
Further investigation revealed that HVAC fans and chillers had been started and shut off several times during this f
. period. Temperature readings for the other days ranged from 20 to 21' C, for both locations. These temperatures complied with human j
factors standards.
Relative humidity ranged from 35 to 45% for 3 feet, and 30 to 45%
i for floor level.
Fluctuations were greatest for May 22 (pm) and May 23.
The other days showed little variability.with an average of approximately 35% humidity for 3 feet, and 37% for floor level.
Relative humidity was within human factors guidelines, l
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