ML20042B815

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Submits Evaluation of Representatives of 6 Months of Data from 10 Meter Meteorological Measurement Sys Per 811008 & NUREG-0519,Suppl 2 Commitment
ML20042B815
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 03/24/1982
From: Schroeder C
COMMONWEALTH EDISON CO.
To: Schwencer A
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0519, RTR-NUREG-519 NUDOCS 8203260179
Download: ML20042B815 (5)
v • d • e


Text

.

D Commonwealth Edison f' ) one First National Plaza. Chicago,11hno_i_s V ' Addrsss R ply to: Post Office Box 767

G Chicago. Illinois 6M90 March 24, 1982 d)

!s DCSi!2D '

Mr. A. Schwencer, Chief Licensing Branch #2 9':

MAR 2579826 p12 Division of Licensing W h4 U.

S. Nuclear Regulatory Commission Washington, DC 20555 9

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Subject:

LaSalle County Station Units 1 and 2 Evaluation o f 6 Months o f Data from the 10 Meter Meteorological Measurements System NRC Docket Nos. 50-373 and 50-374 References (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.

(b):

Request for Additional Information Concerning LaSalle Meteorological Monitoring Program, C. E. Sargent letter to A. Schwencer dated October 8, 1981.

(c):

NUREG 0519, Supplement No. 2,

" Safety Evaluation Report related to the Operation of LaSalle County Station Units 1 and 2," Section 22.2, Item III.A.2, Improving Licensee Emergency Prepareoness-Long Term a

Dear Mr. Schwencer:

The purpose of this letter is to provide Commonwealth Edison Company's evaluation o f the representativeness o f 6 months of data from the 10 meter meteorological measurement system.

The commitment to perform this evaluation was made in Reference (b) and is also documented in Reference (c).

As previously reported (Reference (b)), 33 ft. (10m) wind speed and wind direction systems were implemented on the LaSalle meteorological tower on September 1, 1981.

In order to verify that the_10m winds were not inhibited by the building structures, statis-tical comparisons were made using the first month data collection.

These results were submitted to the NRC in Reference (b).

h 0

A. Schwencer March 24, 1982 To further substantiate the reliability of the 10m wind system, the period from September 1, 1981, through February 28, 1982, was used to determine if the 10m wind direction exhibited significant. distortion due to building effects.

First, the 200 f t (60m) wind direction was compared to the 33 ft (10m) wind direction on an hour-by-hour basis, and a linear regression was performed using 4319 pairs of data.

The results are listed in Table 1.

A similar comparison was made using the 375 f t (114m) wind direction and the 33 ft (10m) wind direction.

The results are also presented in Table 1.

It can be seen from the statistics that there is a good correlation between levels on the tower and there is no indication that the 33 f t (10m) level is a f fected by the Reactor Building.

Plots of these comparisons are show in Figure 1 and 2.

Both plots continue to depict the typical shear seen between levels on the tower and there is not obvious distortion in the zone of possible-building ef fects.

Furthermore, little, if any, distortion was observed in the numerical review of the data.

Therefore, since the records do not show significant distortion due to building ef fects, alternative siting for the 33 f t (10m) level wind instrumentation is not required.

The transmittal of this information fulfills Commonwealth Edison Company 's commit-ment for further evaluation and indicates no further action is required in this regard.

If there are any further questions in this matter, please contact this office.

Very truly yours, Sf14]8L C. W. Schroeder Nuclear Licensing Administrator-1m l

Enclosure cc:

NRC Region III Inspector - LSCS 3700N

/

o TABLE 1 Linea r Regression Result s X = 200 WD X = 375 WD Y=

33 WD Y=

33 WD Slope 0.981 0.973 Intercept 0.537 1.905 Std. Dev.

23.9 28.845 R - Square 0.946 0.922 Each regression was based on 4319 hours0.05 days <br />1.2 hours <br />0.00714 weeks <br />0.00164 months <br /> of data.

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