ML20003F155

Forwards Conceptual Design of Operational Phase Meteorological Monitoring Sys Discussed During 810409 Telcon.Comments Requested.Diagrams Encl

ML20003F155
Person / Time
Site:	Waterford
Issue date:	04/14/1981
From:	Maurin L, Mautin L LOUISIANA POWER & LIGHT CO.
To:	Tedesco R Office of Nuclear Reactor Regulation
References
3-A39, W3P81-1090, NUDOCS 8104200308
Download: ML20003F155 (7)

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1. I OUISIANA 242 caAnonce stneer POWER & LIGHT P o BOX 6008 + NEW OALEANS LoulSIANA 70174 * (504) 368-2345 Nu?IsEsNU , p .,,' ,

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'- April 14, 1981 W3P81-1090

.* 3-A39 APR 17199g ' 3-A1.01.04 U a,%lfMt ECMI ,,

Mr. R. L. Tedesco b \' ,

Assistant Director of Licensing  ! d' g 8--

U. S. Nuclear Regulatory Commission Washington D.C. 20555

SUBJECT:

Waterford SES Unit No. 3 Docket NO 50-382 Operational Phase Meteorological Monitoring Program

Dear Mr. Tedesco:

We have attached a description of the conceptual design of the operational phase meteorological monitoring system which LP&L proposes to install to serve Waterford 3. We would appreciate your comments on the conceptual design in order to assure that the system will meet with your approval, prior to our initiating its purchase and installation.

This design was discussed in a telephone conversation on April 9, 1981 between Ms. J. Lewis of NRC staf f and D. Palmer and F. Pope of Ebasco Services, Inc. , our consultants on this program. This conversation focused on the location and heights of the primary and backup towers, and Ms. Lewis indicated that the proposed location and heights wculd, most likely, be satisfactory. We are therefore proceeding with site preparation and tower installation. .

If you wish, we would be happy to further discuss our proposed system with you in detail, or to receive your comments, at your earliest convenience. Please feel free to contact R. Prados.

Thank you for your cooperation.

Very truly yours, 7%7G L. V. Maurin Project Director LVM/RWP/jc (

Attachment ec: W. M. Stevenson, E. L. Blake 81042003of g

. - s LOUISIANA POWER & LIGHT CCMPANY WATERFORD SES UNIT NO 3 CONCEPTUAL DESIGN OF OPERATIONAL METEOROLOGICAL MONITORING PROGRAM The operational meteorological monitoring program will comply with the USNRC requirements presented in Regulatory Guide 123 Revision 1 (September 1980) concerning meteorological monitoring systems at nuclear power plants and NUREG-0654 Revision 1 (November 1980) concerning 2 emergency response pir.ns and preparedness. The following discussion of the operational program will be divided into four sections: the system location and configuration, the meteorological parameters, data retrieval and storage, and modelling of atmospheric transport and diffusion.

1) System Location and Configuration The on-site meteorological monitoring program will consist of two independent monitoring systems, designated as the prLuary and backup sy s tem. Each is in a location that will be fenced and will contain an equipment shelter, a meteorological tower with instrumentation, a complete lightning protection system (i.e., lightning rods , surge l

arrestors, buried grid, etc), and adequate night illumination. Both tower locations have been selected because of minimal wake interference from existing or projected surrounding obstacles and minimal probability

! that a natural event, such as a lightning strike, could simultaneously disable both systems.

A site pisn showing the locations of the primary and backup l

l meteorological stations is presented in Figure 1 Figure 1 also gives

{ the distances from each tower to the Reactor Building as well as the distance between the towers. The backup meteorological station is 9 3 obstacle heights downwind of the Re - 'or Building, which is a distance that the NRC project meteorologist has indicated is satisf actory. The prLaary station is more than 10 obstacle heights removed from the Reactor Building. Both station locations are immediately surrounded by a former soybean field.

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A generalized plot of the primary station compound, shown in Figure 2, gives the overall compound and instrument shelter dimensions as well as the separation between the tower and the shelter. The backup system compound layout is very similar to that presented in Figure 2.

2) Meteorological Parameters Generally, the meteorological monitoring system at the Waterford 3 site will conform to the requirements of Regulatory Guide 123 and will equal or exceed the equipment specifications presented in the guide. Since the plant utilizes a open cycle cooling system, no instrumentation is needed for measuring atmospheric moisture. The standard deviation of the horizontal wind direction (as ), in conjunction with minimum wind speed criteria, will be used to estimate horizontal dispersion. Temp erature difference with height will be used to estimate vetical dispersion.

Under low wind speed conditions, temperature difference with height will be used for both vertical and horizontal dispersion estimates.

Present plans call for the possible use of #e as a direct indicator of the rate of horizontal atmospheric dispersion during appropriate atmospheric conditions for emergency planning purposes .

Specifically, the 60 meter (199') primary tower will monitor the following meteorological parameters at the indicated levels:

Parameter Level (m)

Wind Speed 10 Wind speed 60 Wind Direction 10 Wind Direction 60 Sigma Theta 10 Sigma Theta 60 Temperature Difference 10-60 Backup Temperature Difference 10-60 Ambient Temperature 10 Precipit ation Ground

The 40 m (130') backup tower will monitor the following meteorological parameters at the identified levels:

Parameter Level (m)

Wind Speed 10 Wind Direction 10 Sigma Iheta 10 Temperature Difference 10-40 The two meteorological monitoring systems have totally independent power supply cables, signal transmission cables, and signal handling for input to the plant computer. The implementation of rigorous quality assurance procedures during operation and semiannual calibration of the equipment are planned to assure the reliability and proper operation of both stations.

3) Data Retrieval Signals tron both the primary and backup stations will be conditioned and ,

changed to a 4 to 20 millisap range prior to transmission to the control room. The conditioned signals will be transmitted fran each tower via independent ecamunication cables to multiplexers for processing, through a quality assurance check, and storage in the plant camputers. Th ese cables are weather resistent and will be placed in a trench approximately 5 feet deep. The cables will be covered with concrete slabs and i

adequately protected against transient electrical fields caused by lightning strikes. Signals from the backup station will be sent to a l

i different multiplexer than that receiving signals from the primary station, and each multiplexer will pass the signal on to both the main andb$up plant computer. Meteorological information will be available for i

1 display on several remote cathode ray terminals connected to the plant computers. Additionally, analog recorders will operate at each station for the purpose of continually recording the meteorological data l

necessary to perform diffusion calculations.

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Data collected at the primary and backup stations will init: ally be stored in the plant computer and periodically (every 4-5 months) be transferred to magentic tape. These data tapes will be permanently stored and used when performing routine dose calculations to fulfill periodic reporting requirements. Averaging intervals of 15 minutes will be used for all displays and data inputs to real time dose calculations; historical data will be stored as hourly averages.

4) Modelling of Atmospheric Transport and Dif fusion Since the terrain surrounding the Waterford 3 site is generally flat, as is most of the Mississippi delta region, the generic NRC guidelines with respect to dif fusion modeling are considered to be applicable. The calculation procedures that will be employed to predict the transport and diffusion of airborne effluents will be contained in the description of the Class A model which will be developed for Waterford 3, persuant to NUREG 0654. These calculation _ procedures are basically those presented in NRC Regulatory Guides 1 145 and 1.111 for accident and routine releases , respectively.

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.0 CATIONS OF PRIMARY AND BACKUP METEOROLOGICAL

, MONITORING SYSTEMS

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. n0WER & LIGHT CO. DI AGRAM OF PRIMARY METEOROLOGICAL

! Waterford Steam TOWER COMPOUND 2 l Electric Station