ML20031D927
| ML20031D927 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/08/1981 |
| From: | Sargent C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8110140377 | |
| Download: ML20031D927 (7) | |
Text
'
i N Comm:nwrith Edison
$ '/ One,
National Plaza. Chicago, libnois s/
Address Reply to. Post Othco Box 767 Chicago. Illinois 60690 October 8, 1981 C.Ll1%
4-\\ >)
Mr. A. Schwencer, Chief S
Licensing Branch #2 bel Division of Licensing 00T 131981* g m
U.S. Nuclear Regulatory Commission M.,
Washington, D.C.
20555
\\( "5'TM*p' Q
ion J/
4,
Subject:
Request for Additional
[T Information Concerning LaSalle Meteorological kcaitoring Program.
Reference (a):
LaSalle County Station Units 1 and 2 Emergency Preparedness Appraisal Response to Notice of Apparent Deficiencies.
L. O. DelGeorge letter to J. G. Keppler dated August 10, 1981.
The purpose of this transmittal is to provide additional information for Item Nos.
8, 9 and 10 of Reference (a).
This information was requested during a telepone conversation with Mr. A.
Bournia on October 1, 1981.
The additional clarification is provided as noted below under each item number.
ITEM #8 A wind speed and wind direction system was mounted at 33 ft.
(10m) on the LaSalle meteorological tower on September 1, 1981.
In order to verify that the 10m winds were not inhibited by the building structures, statistical comparisons were made using the first month of data collection.
First, the 200 ft. (60m) wind direction was compared to the 33 ft. (10m) wind direction on an hour-by-hour basis, and a linear regression performed using 706 pairs of data.
The results are listed in Table 1.
A similar comparison was made using the 375 ft. (114 m) wind direction and the 33 ft. (10m) wind direction.
The results are listed in Table 1 also.
It can been seen from the statistics that there is a good correlation between levels on the tower and there is no indication that the 33 ft. (10m) level is affected by the reactor building.
God 3
/
Plots of these comparisons are shown in Figures 1 and 2.
jf ;
Both plnts depict the typical shear seen between levels on the tower and there is no obvious distortion in the zone of possible building effects.
Furthermore, little, if any, distortion was 8110140377 811000 PDR ADOCK 05000373 p-PDR
_ _. ~ _ - _ _,.. _ _,_- _ -. _ _. _ _
A. Schwencer 2-October 8, 1981 observed in the numerical review of the data.
To further substantiate the reliability of the 33 f t.
(10m) wind system, a similar report will be prepared and submitted to the NRC in March 1982 using the six month data record.
If the six month record shows significant distortion due to building ef fects, an alternate site for the 33 f t.
(10m) level instrumentation will be sought.
ITEM #9 The proposed alternative to the Control Room Analog Record for Meteorological information is outlined in the description of existing and equipment being installed as noted below:
Control Room - Slal indication available for wind speed and direction at 200' and 375' elevation.
Dial i
indication for 375' - 33' differential 1
temperatu;e.
5FYA Computer Terminals throughout station, including Shift Engineer's Office and TSC -
- This system provides, on demand, the most recent 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> of one minute data and most recent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of hourly averages for all parameters measured on tower A.
Analog Records at base of Meteorlogical Tower -
- Provide record of all parameters.
Equipment being installed Control Room - Redundant process computers with six second sampling of wind speed and direction and one j
minute sampling of temperatare and oifferential temperature hard wired from tower.
Computers develop one minute averages and 15 minute running averages for all parameters.
Call up capability of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of one minute or 15 j
minute averages is expected.
This computer will also use the "A Model" to utilize meteorological data in conjunction with hard wired input from process ef fluent monitors to determine whether preset EAL's are exceeded.
If these limits are exceeded, the computer will alarm and print out appropriate messages to the control room operator.
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4 t
A. Schwencer October 8, 1981 Because of the improvement in providing data and data analysis by the process computer "A Model" and with the redundancy of information available in the Control Room and other areas of the plant, the meteorological data systems at LaSalle should be adequate to provide a reliable record of i
meteorological information.
ITEM #10
~~
In the event a given meteorogical tower is down and no measurements are available from it, a backup tower and equipment will be installed within /2 hours.
In the interim, until the back-up equipment is functioning, forcasted meteorological cata are available to the station from the meteorological contractor.
These forcasted data can be pulled and stored in.the station SYFA and thus made available to the TSC or the Shif t Engineer's Office.
A proposed Technical. Specification for the Meteorological Mc71toring Instrumentation has also been provided in Figure 3.
Please forward to Mr. R. Bottimore for inclusion in the LaSalle Technical Specificaton.
If there are any questions in this regard, please contact this office.
Very truly yours, 3
0$kwyd C. E. Sargent Nuclear Licensing Administrator i
cc:
Mr. A. Bournia lm 2654N l
4 t
f m
TABLE 1 Linear Regression Results x=
200wd x = 375 wd y=
33 wd y=
33 wd Slope 0.973 0.956 Intercept
-0.51 2.09 Std. Dev.
18.9 24.9 R-Square 0.971 0.949 Each regression was based on 706 hours0.00817 days <br />0.196 hours <br />0.00117 weeks <br />2.68633e-4 months <br /> of data.
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