ML20149D606
| ML20149D606 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/29/1988 |
| From: | Croley B SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| AGM-TA-88-008, AGM-TA-88-8, NUDOCS 8802090562 | |
| Download: ML20149D606 (17) | |
Text
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/ SMU-SACRAMENTO MUNICIPAL UTIUTY DISTRICT C 6201 s street, P.o. Box 15830. sectamento CA 958521830,1916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA AGM/TA 88-008 3.a a u U. S. Nuclear Regulatory Commission Attn: Frank J. Miraglia, Jr.
Associate Director for Projects Phillips Building 7920 Norfolk Avenue Bethesda, MD 20014 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 METEOROLOGICAL SYSTEM PROGRAM IMPROVEMENTS - DIVERGENCE ZONE STUDY PROTOCOL
Dear Mr. Miraglia:
On October 29, 1987, in letter GCA 87-733, the District identified several restart and after restart commitments intended to improve its meteorological program. With respect to the assessment of the unique meteorological flow patterns at Rancho Seco, the District indicated it would perform a field study during a temporally representative portion of the divergence zone period (i.e., May to September 1988), utilizing concurrent data obtained from several 10-meter meteorological towers located at strategic positions east of Rancho Seco. Attachment I, "Divergence Zone Windfield Study Protocol", represents the field study to be performed by the District. The field study will better define Rancho Seco's divergence zone flows. After the NRC has had sufficient opportunity to review the study protocol, the District would welcome an opportunity to further discuss the study with cognizant staff.
Please contact me if you have any comments or questions. Members of your staff with comments or questions requiring additional information or clart fication may contact Mr. Richard Mannheimer at (209) 333-2935, extension 4919.
Sincerely,
/ < A ^7 l Bob G. Croley i Assistant General Manager, l Technical and Administrative Services l
0 l Attachments 6802090562 000129 A(
PDR P
ADOCK 05000312 PDR 'l RANCHO SECO NUCLEAR GENERATING STATION O 1444o Twin Cities Road. Heia!d, CA 95638 9799;(2o9) 333-2335
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4 AGM/TA 88-008 Frank J. Miraglia, Jr. 2-cc: G. Kalman, NRC, Bethesda A. D' Angelo, NRC, Mancho Seco J. B. Martin, NRC, Walnut Creek I. Spickler, NRC, Bethesda R. Fish, NRC Region V, Walnut Creek i
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o ATTACHMENT I Page 1 of 5 Diveraence Zone Windfield Study Protocol, 1.0 Backaround The divergence zone wind flow phenomenon generally occurs with the establishment of the semipermanent high pressure area over the Eastern Pacific Ocean during the April through October priod. This climatological feature is conducive to seabreeze flows due to weak synoptic flows, coupled with large land-water temperature differentials. Once these seabreeze flows are generated, the only path of entry into the wide U-shaped Sacramento and San Joaquin Valley basin from the Pacific Ocean is through the Carquinez Straits. This unique topography of channeled flow into a wide valley, with blockage by the Sierra Nevada mountains to the East, results in a mesoscale flow pattern known in the literature as a Divergence Zone Windfield.
Under this type of meteorological flow regime, concurrent winds at National Weather Service (NWS) offices in Sacramento (NW of Rancho Seco) and Stockton (SW of Rancho Seco) not only exhibit non linearity between themselves but also with winds at Rancho Seco. It is not uncommon to see the following wind directions at the same point in time:
Stockton NWS - NW Sacramento NWS - SSW Rancho Seco -W This spatially-variant flow (i.e., wind field variations in space at the same point in time) is not well represented by the industry-standard temporally and spatially invariant Gaussian dispersion model. Rancho Seco's dispersion model, which is utilized for projected dose estimation within the 10-mile radius plume exposure Emergency Planning Zone (EPZ); which may be used in certain accident sequences to formulate Protective Action Recommendations, does not consider spatial variations in the windfield. Examples of divergence zone flows, adopted from the Rancho Seco Updated Safety Analysis Report (USAR), are presented in Figures 1 and 2. In order to compensate for the model limitations relative to these specialized meteorological flows, the District has built in conservative protective action criteria to account for what is presently known about this phenomenon.
However, the question of whether a divergence zone flow in the Sacramento - San Joaquin Valley results in a spatially-variant flow within the Ranche Seco plume exposure EPZ has yet to be answered. In actuality, it is the 180 degree EPZ hemisphere north thrcugh east to south of Rancho Seco that has the most relevance. When divergence zone flows occur, downwind spatial variability remains the key concern. Accordingly, the District has committed to answering two crucial questions:
- 1. Do divergence zone flows in the Sacramento - San Joaquin valley result in spatially variant flows in the Eastern portion of the RSNGS plume exposure EPZ?
Page 2 of 5
- 2. Do the existing compensatory protective action recomendations sufficiently account for the full scope of the aforementioned spatially variant flows?
The divergence zone wind field study, which will be described in subsequent sections, intends to provide a sufficient data base to adequately answer these questions. Of particular interest is the location of Rancho Seco with respect to the Carquinez Straits and the Sierra Nevada foothills. This is shown two-dimensionally in Figure 3, and three-dimensionally in Figure 4. Examination of-these figures and application of the micrometeorological principles that govern these flows suggest that spatially variant flows in the Eastern hemisphere of the Rancho Seco EPA under divergence zone flows within the entire valley may not occur frequently.
2.0 Study Ob.iectives The objectives of this study are the following:
- 1. Obtain a temporally and spatially representative data base in the eastern portion of the Rancho Seco EPZ to permit evaluation of the divergence zone flow phenomenon within the EPZ.
- 2. Establish the extent and frequency of spatial variability within the eastern portion of the Rancho Seco EPZ from the acquired data base.
- 3. Evaluate the weaknesses inherent in the use of the temporally and s)atially invariant Gaussian model (i.e., Class A model) relative to tie established spatial wind flow variations in the EPZ.
- 4. Propose improvements to the Class A model and/or compensatory protective action recommendations that more accurately describe the divergence zone flows within the Rancho Seco EPZ.
3.0 ildy_Acoroach Since the seabreeze flow, which is a precursor to the divergence zone flow phenomenon, is a climatological 1y repeatable event, the study data base should be geared to the seabreeze flow periodicity. The seabreeze, which occurs with the onset of the semipermanent high aressure area over the eastern Pacific Ocean, usually occurs during the April tirough October period. After October the high weakens and recedes to the south, and migratory cyclonic flow generally occurs until the spring months. Therefore, the data period chosen for this study is May 1,1988 through September 30, 1988. This five month period should provide a sufficient variety of divergence zone flow sequences to meet the temporal and spatial representativeness objectives of the study.
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% Page 3 of 5 In order to establish the extent and frequency of spatial variability within the eas, tern, portion of the Rancho Seco EPZ remote, meteorological towers need to be sited. at strategic locations within- the eastern segment of the EPZ. Figures 5 througri 7 present the locations of the sites chosen for remote tower siting. Due to the sparseness of roads within' the EPZ, creative means were required to establish three reasonably good sites.
Site 1:
(Figure 5) located in a meadow off Route 104 just before the Amador County
' line about 5 miles to the NE of Rancho Seco. The site is in a region of relatively flat terrain with occasional foothill knolls in the vicinity. Site has low incidence of trees.
Site 2:
(Figure 6) located nearby the sewage treatment plant in Ione about 8 miles to the East of Rancho Seco. The site is in a region of relatively flat terrain with a limited number of trees. Site is located within the Sierra Nevada foothills.
Site 3:
1 Figure 7) located in a meadow off route 88 on the Amador/ San Joaquin County line within the "toes" of the Sierra Nevada foothills about 6.5 miles Southeast of Rancho Seco. Site is in a region of relatively flat terrain with very few trees nearby.
System Descrioti_Qn Th& wind monitoring system, as shown in Figure 8 will consist of a wind weather
, station to measure the wind direction and speed, a data logger to store the measured data, and a data collector to transfer the data to a host computer. The wind weather station sensors will be mounted on a 10 metsr laydown tower with down leads to a NEMA enclosure containing the signal conditioners, a digital data logger, and an external battery. The wind direction will be computed by the data logger with an algorithm that will sum the wind direction as a series of
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individual vectors (angle vs time; i.e., direction vs magnitude) while the wind
.- speed will be measured directly. The wind sensors analog output signals will be digitized by the data logger. The data logger will compile the data in a 15 to 60 minute format of the minimum, maximum, and average values, and then the data is stored electronically.
The wind weather station data will be retrieved with a hand-held digital data collector for subsequent transfer to a host ~ computer. The hand-held data coector is capable of storing data from the three wind weather stations. The wind direction and wind data will be analyzed by the host IBM PC or compatible computer for review. The data will,be saved (archived) with a hard copy printout and a disk format historical file. The wind direction and speed data may be analyzed and plotted using existing : software such as Lotus 123 (registered
, trademark of Lotus Development Qorporation). .
A simplified block di:. gram of~the. wiiId direction and speed monitoring system is shown in Figure 9, and a component description is presented on Table 1.
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y e Page 4 of 5 MEASUREMENT PROCEDVRE: The following is a preliminary description of the wind direction and speed measurement installation, data gathering, and analysis procedure. INSTALLATION: o Prepare the foundation for the 10 meter'laydown tower. o Erect the 10 meter laydown tower. o Install the full height grounding kit. o Install the wind weather station sensors and align wind direction sensor to north, o Install the signal conditioners, data logger, external battery and interconnecting cables. o Verify the proper operation of the wind weather station sensors, signal conditioners, data logger, and battery power supply, o Program the wind weather station data logger.
- Measurement interval; one to five seconds.
Measurement period; 15 to 60 minutes. DATA GATHERING: Retrieve wind weather station with the hand held data collector once per week. Inspect weather station for damage and proper alignment, and check the battery power supply output voltage during every visit.
. Transfer the data collector to an IBM PC or compatible computer. Store the wind weather station data as a unique file on a working and backup disk file and printout data for a permanent record.
ANALYSIS: The District's WSI system and Rancho Seco MIDAS data will provide a means of identifying divergence zone windfield occurrences.
t Page 5 of 5 For the periods of identified divergence zone winds, the wind speed and wind direction data for Rancho Seco and the three remote towers-will be examined for . statistical relationships. Various elements of the Statistical Analysis System (SAS) package developed at North Carolina State University will be used to develop statistical . relationships. These will include correlation coefficients and regression equations that will allow prediction of wind directions at. remote town locations using Rancho Seco data. The Rancho Seco tower will remain permanent. Should good statistical relationships not exist, it may become necessary to retain one or more of the remote towers. l In addition, windfield streamlines will be developed for the divergence zone conditions and flow patterns in the EPZ. The analytical results will be compared to the Class A model projections to determine: o How well the model projects doses; o How well the compensatory protective action recommendations account for the differences. Adjustments to the model and/or protective actions will be based on these analytical results. 9
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4 5 . TABLE l l WIND DIRECTION AND SPEED MONITORING SYSTEM PRELIMINARY DESCRIPTION OF COMPONENTS J DESCRIPTION QTY MODEL I l WIND INSTRUMENTS - CLIMATRONICS CORPORATION Wind Mark III Wind Sensors 3 WM-III Signal Conditionera 3 Weather Proof Enclosure 3 j 10 Meter Laydown Aluminum Tower 3 C-33 full Meight Grounding Kit 3 100924
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