ML20111C661

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Corrected Page 9 to Motion for Summary Disposition on Citizens Concerned About Nuclear Power Contention 4 Re Wind Speed
ML20111C661
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 03/13/1985
From:
HOUSTON LIGHTING & POWER CO.
To:
Atomic Safety and Licensing Board Panel
Shared Package
ML20111C656 List:
References
OL, NUDOCS 8503150495
Download: ML20111C661 (1)


Text

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The STP OBW of 125 mph was verified utilizing the most 4

recent analytical methods and data not available at the time the original FSAR analysis was performed. Wolfe at TT 9-13. The highest 100-year recurrence fastest mile wind speed obtained for any individual station under the most recent analyses was 116 mph for corpus Christi. A separate composite analysis, utilizing the highest fastest-mile ~ wind speeds at any of the measurement sta-tions for each year of the data period, resulted in a calculated value of 118 mph. Another appropriate analytical method resulted in a 100-year recurrence value of 125 mph. Wolfe at 1 13.

Thus, the statistical methodologies utilized to verify 1

] the STP OBW resulted in 100-year recurrence fastest-mile wind i speeds equal to or lower than that originally calculated for STP, demonstrating that the 125 mph OBW is supported by the most I recent data and current analytical methods. Id,. In addition, the adequacy of the STP OBW has been reaffirmed by the NRC Staff:

The available statistical analyses of extreme wind speeds in the area of STP indicate that the " fastest mile" wind speed 30-feet above ground at the 10- probability level [100-year recurrence] is about 125 mph. . . . In the context of an operating basis condi-tion . . . the selection of a design wind velocity of 125 mph is consistent with Commission regulations and guidance, and is supported by a variety of-independent assessments of occurrences of extreme wind speeds in the STP area.

OBW value is sufficiently conservative in light of the fact that "there are many reported wind speeds that are

significantly higher." Tr. at 10746. As described in Mr.

Wolfe's Affidavit, such data are unsuitable for calculating recurrent fastest-mile wind speeds for STP. Wolfe at 11 14-22.

8503150495 850313

  • PDR ADOCK 05000498 0 PDR-

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