ML20155B002

Submits Tabulation of Plant Primary Meteorological Tower Parameters for Apr-June 1988,per Insp Open Items 445/8807-02 & 446/8806-02.Table Ii,Percent Data Recovery for 1988 First & Second Quarterly Periods Combined Encl

ML20155B002
Person / Time
Site:	Comanche Peak
Issue date:	09/28/1988
From:	Counsil W, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
TXX-88681, NUDOCS 8810060153
Download: ML20155B002 (10)

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-- Log # TXX-88681 h d' File # 902.3

RJELECTRIC September 28, 1988

$$UdA U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 METEOROLOGICAL DATA AVAILABILITY REF: 1) HRC letter from R. F. Warnick to W. G. Counsil dated March 3,1988 (NRC Inspection Report Nos. 50-445/88-07 and 50-446/88-06)

2) TV Electric letter TXX-88624 from W. G. Counsil to the NRC dated August 19, 1988 Gentlemen:

In partial response to the letter dealing with Nuclear Regulatory Commission (NRC) open items 445/8807-02 and 446/8806-02 (Reference 1), TV Electric hereby submits a tabulation of the CPSES primary meteorological tower parameters for theperiodApril1,1988,throughJune 30, 1988, in Table I and a cumulative percent data recovery for the first and second quarterly periods combined in Table II.

It should be noted that for each parameter in Table I, the percent recovery is well above 90 percent as specified in ANSI /ANS-2.5-1984, which is endorsed by Regulatory Guide 1.23, Second Proposed Revision 1 (April, 1986). In addition, the joint percent data recovery for 10m wind speed,10m wind direction and 60-10m delta temperature during this period is 98 percent.

To ensure that the meteorological data are within accuracy specifications, quality checks have been performed by the computer system that generatej the hourly average values and by physical examination of the data itself. Some of the various quality' checks that were performed on the data include:

o Checks for reading values outside sensor range; o Checks for detecting sticky sensor hearings; o Data checks with adjacent to-r lew1 sensor s for inipioper range 50tting dild/or 04f -of-t .tl threit itui problents; o Checks for determining etf ects of day time inversions.

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.* 4 TXX-88681 September 28, 1988 Page 2 of 2 As a result of the various quality checks performed on the meteorological data for this time period, the percent data recovery for each paramett.r presented in the attached table is considered to be valid.

TV Electric has also completed an initial review of meteorological data as recorded by the 10m backup tower at its new location near the 60m primary tower. The review consisted of comparing concurrent primary and backu average wind speed and wind directional data for the 24 day (576 hour0.00667 days <br />0.16 hours <br />9.523809e-4 weeks <br />2.19168e-4 months <br />)p hourly period August 26 1988. through September 18, 1988.

3 Figures 1 through 6 (Attachment 3) represent actual plots of wind speed and wind directional data for three (3) selected days during the 24 day period. The days dtpicted represent occurrences of low, high and varying wind speed conditions. It should be noted that since the relocation and prior to September 16, 1988, the backup tower instrumentation had not been calibrated and the wind direction values were off by 11 degrees. Subsequently, for the purpose of this analysis, wind directional values were adjusted to account for this 11 degree difference. As shown in the Figures, both the backu) tower wind speed and wind directional parameters are correlating well wit 1 the primary tower, very truly yours, b.bhm W. G. Counsil By:

0. R. Woodlan Docket Licensing Manager RSB/mlh Attachments c - Mr. J. H. Wilson, OSP-NRC Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)

l Attachment 1 to TXX-88681 September 28, 1988 Page 1 of 1 TABLE I CPSES PERCENT DATA RECOVERY FROM PRIMARY METEOROLOGICAL TOWER FOR THE PERIOD APRIL 1, 1988 TO JUNE 30, 1C88 Primary Tower Total Bad Good Percent Data Parameter Hours Hours Hours Recovery 10 m Wind Speed 2,184 35 2,149 98 10 m Wind Direction 2,184 34 2,150 98 10 m Ambient Temperature 2,184 34 2,150 98 10 m Sigma Theta 2,184 34 2,150 98 60 m Wind Speed 2,184 58 2,126 97 60 m Wind Direction 2,184 69 2,115 97 60-10 m Delta Temperature 2,184 49 2,135 98 Precipitation 2,184 33 2,151 98 Combined 10 m Wind Speed 10 m Wind Direction, and 60-10 m Delta Temperature 2,184 50 2,134 98

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Attachment 2 to TXX-88681 September 28, 1988 Page 1 of 1 TABLE II CPSES PERCENT DATA REC 0VERY FROM PRIMARY METEOROLOGICAL TOWER FIRST AND SECOND QUARTERLY 1988 PERIODS COMBINED Primary Tower Total Bad Good Percent Data Parameter Hours Hours Hours Recovery 10 m Wind Speed 4,368 56 4,312 98.7 10 m Wind Direction 4,368 51 4,317 98.8 10 m Ambient Temperature 4,368 49 4,319 98.9 10 m Sigma Theta 4,368 51 4,317 98.8 60 m Wind Speed 4,368 125 243 97.1 60 m Wind Direction 4,368 105 ,263 97.6 60-10 m Delta Temperature 4,368 89 4,279 97.9 Precipitation 4,368 47 4.321 98.9 Combined 10 m Wind Speed 10 m Wind Direction, and 60-10 m Delta Temperature 4,368 95 4,275 97.9

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