ML20245F528
| ML20245F528 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/07/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-REGGD-01.023, RTR-REGGD-1.023 TXX-89538, NUDOCS 8908140356 | |
| Download: ML20245F528 (2) | |
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Log -# TXX-89538 0!_
File # 902.3
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.l nlELECTRIC August 7, 1989
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Esecutive Vice Prendent '
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 MEASUREMENT PROGRAM.
REF: TV Electric letter TXX-89121 from W111'am J. Cahill, Jr.
to the NRC dated April 14, 1989 Gentlemen:
During a recent evaluation of a ' problem report f reitiated from the Primary meteorological tower 60m wind direction parameter calibration, an out-of-tolerance condition was observed for the translator component test values. As a result of..this finding, TU E16ctric initiated a re-evaluation.of the 60m wind direction data for the' previous 6 month calibration period (April 7 through October 18, 1988). The results of that re-evaluation are as follows:
A +0.94 degree out-of-tolerance condition was observed within the 60m wind direction channel loop at the translator component. Although it is possible
.that the drift of downstream components may have offset or amplified the translator component drift, a loop accuracy check was not performed prior to these adjustments to verify overall loop accuracy.
In future calibrations. TU Electric will verify overall channel accuracy prior to component adjustmeni.s.
Since the accuracy requirement of 5.0 degrees, as specified in ANSI /ANI 2.5-1984, applies to the overall channel loop accuracy, it is conservatively assumed that all of the 60m wind direction data for this 6 month period is out-of-tolerance.
Therefore, the percent data recovery for the 60m wind direction parameter for the 1988 calendar yer/, previously submitted in the referenced letter, has been revised from 95 to 45 percent, av FurtherJ the 60m wind direction data for this 6 month period has been redesigouted as missing data.
In additior, tne 60m wind directior. for the
~0 1
remaining 1980 data period was also re-examined: this data was found to me9t accuracy requirements.
This revised data does not impact the reported combined percent recovery of 93 percent for 10m wind speed 10m wind direction and 60-10m delta temperature.
890814o356 890s07
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PDR ADOCK 0500o445 E.
' i 400 North Olive Street LB El Dallas, Texas 75201 wL_-_ ____. - - _ _ _ _ _ _ _ _
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TXX-89538 August 7, 1989 Page 2 of 2 For the one year pre-OL data collection period requested by the NRC.
TV Electric remains in full compliance with the Regulatory Guide 1.23, Second Proposed Revision 1, requirement for 90 percent data recovery.
Sincerely.
/
William J. Cahill, Jr.
RSB/vid c - Mr. R. D. Martin. Region IV Resident Inspectors, CPSES (3)
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