ML19221A949
| ML19221A949 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-02.3.1, NUREG-75-87, NUREG-75-87-2.3.1, SRP-02.03.01, SRP-2.03.01, NUDOCS 7907120028 | |
| Download: ML19221A949 (4) | |
Text
NU REG-75/087 O** Reag%
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U.S. NUCLEAR REGULATORY COMMISSION O
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W<%....#jSTANDARD REVIEW PLAN OFFICE OF NUCLEAR REACTOR REGULATION SECTION 2.3.I REGIONAL CLIMATOLOGY REVIEW RESPONSIBILITIES Primary - Hydrology-Meteorology Branch (HM3) 5 9ndary - None I.
AREAS OF REVIEW Information is presented by the applicant and reviewed by the staf f concerning averages and extremes of climatic conditions and regional meteorological phenomena which affect the safe desigr. and siting of the plant. The review covers the following specific areas:
1.
a description of the general climate of the region with respect to types of air masses, synoptic features (high and low pressure systems and frohtal systems), general air-flow patterns (wind direction and speed), temperature and humidity, precipitation (rain, snow, and sleet), and relationships between synoptic-scale atmospheric pro-cesses and local (site) meteorological conditions.
2.
Seasonal and annual f requencies of severe weather phenomena including tornadoes, water-spouts, thunderstorms, lightning, hail (including probable maximum siza), and high air pollution potential.
3.
Meteorological conditions used as design and operating bases including:
a.
The maximum snow and ice load (water equivalent) that the roofs of safety-related structures must be capable of withstandirg during plant operition.
l b.
Ultimate heat sink meteorological conditions resulting in maximum evaporation and drif t loss of water and minimum water cooling.
c.
Tornada parameters including translational speed, rotational speed, and the maximum pressure differential with the associated time interval.
d.
100 year return period " fastest mile of wind" including vertical velocity dis-tribution and gust factor, e.
Probable maximum annual f requency of occurrence and time duration of f reez my rain (ice storms) and, where applicable, dust (sand) storms.
USNRC STAND ARD REVIEW PLAN Stenderd rev6ew plane are propered for the guidance of the Office of Nweseer Reactee Regw6etten staff reopenenbee for the revtew of eppl6 cations to cenetract and operste nueker power paonte These documente are enade evoetabte to the puhuc se part of the Comm6eo6en e enacy to inform the nucaeer 6ndweery end the gene es pub #c of reewletery precedures and pouctee Stenderd rewtow p6 ens are etet subeenutee for regutetery guidee or the Commiessen a regvienene end compusw eveh them is not regwered The seenderd rewtow plan sectione are keyed to Revteten 2 of the Standard Permet and Centent of Safety Acervene Reports fee Nucseer Power Ptente Not en poettene of the St andere Formet have e cereesponding rev+ew pien.
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/l ew.u.hed stand.ed re w piene win b. r sed p.see ceny. es.ppreeriete. is e=emened.t. comm.nte.nd to,ec.,, new inee-et.on and e,enknd do a
8 Commente end suggesteens for improvement will be coneddered and shawed be sent to the U S Nwe6eer Regweetery Commte*6en,0fme of Nwcteer Reector Regwietten. Weehengten. D C. 2GIES.
Rev. 1 7907120 098
f.
Other meteorological and air quality conditions used for design and coerating basis consideratioas.
O II.
ACCEPTANCE CRITERIA The information in this section will be acceptabia if the regional meteorological con-ditions and phenomena which affect the safe design and siting of the plant are presented and substantiated in accordance with acceptable practice and data as promulgated by the National Oceanic and Atmospheric Administration (NOAA), industry standards, and Commission guides, criteria, and regulatiuns. More specifically the following criteria are used to determine acceptability.
The description of the general climate of the regicn should be bassd on standard climatic summaries compiled by NOAA. Consideration of the relationships between regional synoptic-scale atmospheric processes and local (site) meteorologica; conditions should be based on appropriate meteorological data.
Data on severe weather phenomena should be based on standard meteorological records from nsarby representative National Weather Service (NWS), military or other stations recog-nized as standard installations which have long periods of record.
Trie applicability cf these data to represent site conditions during the expected period of reactor operation must be substantiated.
Design basis tornado parameters should be based on Regulatory Guide 1. 76 (Ref. 2) or an sie-quately substantiated study must have been performed to demonstrate that lower values apply to the specific site. Operating basis wind velocity (fastest mile of wind) should be based on a standard such as that published by the American National Standards Institute (ANSI) with suitable corrections for local conditions. The ultimate h';at sink freteorological data, as stated in Regulatory Guide 1.27 (Ref. 1) should be based on long period regional records which represent site conditions. Freezing rain estimates are to Le based on representative NWS station data. All other meteorological and air quality data used for safety related plant design and operating bases should be documented and substantiated.
High air pollution potential information should be based on U.S. Environmental Protection Agency (EPA) studies.
III. REVIEW PROCEDURES 1.
General Climate The general climatic descriptic,n of the region in which the site is located is re-viewed for completeness and authenticity. Climatic parameters such as air masses, general airflow, pressure patterns, frontal systems, and temperature and humidity conditions reported by the applicant are checked against standard references (Ref.
3 and 4) for apprcpriateness with respect to location and period of record.
145 2H 5 Rev. 1 2.3.1-2
The applicant's description of the role of synoptic-scale atmospheric processes on local (site) meteorological conditions is checked agains' the descriptions provided in References 4 and 5 and the reviewer's knowledge of the area.
2.
Regional Meteorological Averages and Extremes Since meteorological averages and extremes can only be obtained from stations in the region of the site which have long periods of record, and the stations are not usually very close to the site, a determination of the representativeness of the data to site conditions is the primary concern in the review. A determination of the adequacy of the stations and their data is also lade.
Recorded meteorological averages and extremes are checked against standard publications such as Reference 5.
Snow and ice load adequacy is checked for reasonableness against ANSI A58.1-1972 (Ref 7) ar.d regional data available in References 4, 5, and 6.
References 4 and 5 provide information on other averages jnd extremes. References 8 and 9 provide information on high air pollution potential for verification. Extreme winds and the specific vertical velocity distribution are checked against References 7 and 11.
Gust factors are checked against Reference 7.
The design basis tornado parameters are checked for agreement with Regulatory Guide 1.76 (Ref. 2) and tornado data are verified using the precedures and data in WASH-1300 (Ref. 10).
IV.
EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and that his evaluation supports concluding stateitents of the following type to be included in the staff'3 safety evaluation report:
"The staff has reviewed available information relative to the regional meteorological conditions of importance to the safe design and siting of this plant and has concluded that the following meteorological design parameters are appropriate."
This statement will be followed by a resume of the general climate and the meteorological design paramenters used for the plant.
V.
REFERENCES 1.
Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Power Plants."
2.
Regulatory Guide 1.76, " Design Basis Tornado for Nuclear Power Plants."
3.
U.S. Dapartment of Commerce, " Climatic Atlas of the United States," Environmental Data Service, NOAA, June 1968.
145 246 Rev. 1 2.3.1-3
U.S.DepartmentofCommerce,"LocalClimatologicalData-AnnualSummarywithComparativel 4.
Data," Environmental Data Service, NOAA, published annually for all first-order NWS stations.
5.
U.S. Department of Commerce, " State Clirr.atological Summary," Environmental Da ta Service, NOAA, published annually by state.
6.
U.S. Department of Commerce, " Storm Data," Environmental Data Service, NOAA, published monthly.
/.
" Building Code Requirements for Minimum Design Loads in Buildings and other Structures," American National Standaras Institute (1972).
8 G. C. Holzworth, " Mixing Heights, Wind Speeds, and Potential for Urban Air Pollution Throughout the Contiguous baited States," AP-101, Office of Air Programs, USEPA, January 1972.
9.
J. Korshover, " Climatology of Stagnating Anticyclones East of the Rocky Mountains, 1936-1970," Publication No. 99-AP-34, Public Health Service, October 1971.
10 E. H. Markee, Jr., " Technical Basis for Interim Regional Tornado Criteria," WASH-1300, USAEC, May 1974.
11.
H. C. S. Thom, "New Distribution of Extreme Winds in the United States," Journal of the Structural Division, Proceedi. gs of the Americar Society of Civil Engineers, pp.
1787-1801, July 1968.
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