ML20206E056

Commits to Broadening Scope of 870226 Upgrade of Meteorological Sys to Include Installation of fixed-width Guyed Tower Approx 120 Yards Southwest of Existing Tower,Per 870211 Meeting.Schedule Will Be Submitted within 30 Days

ML20206E056
Person / Time
Site:	Rancho Seco
Issue date:	04/01/1987
From:	Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F Office of Nuclear Reactor Regulation
References
JEW-87-476, TAC-63030, NUDOCS 8704130501
Download: ML20206E056 (2)

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SACRAMENTO MUNICIPAL UTILITY DISTRICT C P. O. Box 15830, Sacramento CA 95852-1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA APR 011987 JEW 87-476 Director of Nuclear Reactor Regulation Attn:

Frank J. Miraglia, Jr.

Division of PWR Licensing-B U. S. Nuclear Regulatory Conunission Washington, D. C.

20555 DOCKET 50-312 RANCHO SECO NUCLEAR GENERATING STATION UNIT #1 LICENSE NO. DRR-54 METEOROLOGICAL SYSTEM PROGRAM IMPROVEMENTS LETTER DATED FEBRUARY 26, 1987, J.E. WARD TO F.J. MIRAGLIA

Dear Mr. Miraglia:

This letter concerns the longterm program upgrade for the meteorological system, as committed to in the letter cited above.

During the february 11, 1987, meeting with Messrs. Miner and Spickler, among others, District staff outlined the specific hardware improvements committed to for the meteorological system and particularly for the meteorological tower instrumentation.

Included in the scope of the upgrade were new signal processors, new cabling on the tower (to be enclosed in condult), new wind speed and direction sensors, installation of a lightning protection system, and a backup 10-meter tower.

Discussion centered on two key issues:

1)

Representativeness of wind speed and direction data due to tower-induced turbulence 2)

Tower siting effects on temperature change data due to proximity of asphalt road surfaces, ff N\\

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DISTRICT HEADQUARTERS O 0201 S Street, Sacramento CA 95817-1899 l

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• Frank J. Miraglia, Jr. APR0119s7

-JEW 87-476 To address these issues, the District commits to broadening the scope of the program upgrade so that it includes installation of a fixed-width guyed tower to be sited approximately 120 yards southwest of the existing tower.

This i

location was visited by Mr. Spickler soon after the February 11, 1987 meeting. He informally indicated to cognizant SMUD individuals that this location, which is away from the road, will likely provide representative data. All hardware modifications planned for the existing tower will be installed on the new tower.

The existing meteorological tower will then be used as a backup.

The District will submit a preliminary schedule for this upgrade within 30 days.

If you have any questions concerning this submittal, please contact Mr. Robert Myers of my staff at (916) 732-6025.

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Sincerely, J

d eputy General Manager, Nuclear l

cc:

A. D'Angelo, NRC, Rancho Seco G. Kalman, NRC, Bethesda i

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