ML19310F690

Forwards Draft Input for Ser,Chapter 2.3,prepared by Accident Evaluation Branch.Open Items in Meteorology Section Review Pertain to Applicant Program for Measurement & Utilization of Parameters for Emergency Planning

ML19310F690
Person / Time
Site:	Grand Gulf
Issue date:	01/29/1981
From:	Kreger W Office of Nuclear Reactor Regulation
To:	Tedesco R Office of Nuclear Reactor Regulation
References
NUDOCS 8102170606
Download: ML19310F690 (7)

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Distribution:

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) Docket Files AES Rdg Dochet Nos.: 50-416/417 JAN 29 13dl "EMORANDL"i FOR: Robert L. Tedesco, Assistant Director for Licensing Division of Licensing FR0":

William E. Kreger, Assistant Director for Radiation Protection, Division of Systems Integration

SUBJECT:

DRAFT SER IMPUT: CHAPTER 2.3 Plant Name: Grand Gulf Steam Electric Station Licensing Stage: OL Licensing 3 ranch: Licensing Eranch 3, J. fiartore, LP:t

?.equested Completion Date: January 2, 1981 L',eview Status: Continuing I.eview 2 ranch: Accident Evaluadon Branch, DSI - Neteorology Section Draft input for the Grand Gulf SER, Chapter 2.3 is enclosed. This draft input was p epared by J. Lewis ("etecrology Section, AE3). Sections 2.3.1, 2.3.2, 2.3.4 and 2.3.5 are complete. The open items in the ileteorology Section's review all pertain to the applicant's program for measurement and utilization of meteorological parameters for emergency planning.

L' hen suffic-ient information on the inplementation of NUREG-0554, Appendix 2, is provided, input to Sections 2.3.3 and Chapter 13 will ;e transmitted, or:gr:a g W. E. Kreger Willing E. Kreger, Assistant Director for Radiation Protection Division of Systems Integration

Enclosure:

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INPUT TO GRAND GULF SER Accicent Evaluation Branch 2.3 Neteorolocy 2.3.1 Realonal Climatology The climate of soutnwestern Mississippi is humid subtropical, with a shcrt cold season anc a relative long warm season.

The predominant air mass type over the region curing most of the year is 3 nating over tne Gulf of Mexico.

In the, sinter, mariti:c,e tropical cri i

occasional southward move::ents of continental polar air f rom Canada oring colcer and crier air into Mississippi. Precipitation is well cistributec inrougnout tne year, witn a.naximum in March ano a minluuu in Octocer.

Tnrou3nout tne year, precipitation occurs :uainly as rain.

Annual snowfall normally averages only acout 3 cm (1.5 inches).

Hign air pollution potential (atmospheric stagnation) can be expected to exist, on the average, on about two days during the year.

Atmospheric dispersion rates are expected to be near the average for all sites in the United States.

There has been no change i, the regional climatology since the construction permit was issueo. The staff concludes that there are no unusual ' climatological features of the site and that, pursuant to the requirements of 10 CFR Part 100.10, adequate consideration has been given to the regional climatology of the Granc Gulf site.

2.3.2 Local Peteorology The plant site is on tne east bank of the Mississipp1 River about 40 km (25 miles) south of Vicksburg. Tne terrain in the vicinity of the plant slopes upward towara the east frca the relatively flat river flood plain to an area of rollins hills which is separatea from the flood plain Dy a bluff.

High wind occurrences in the site area are associatec with severe tnuncerstor:as, tornacces or hurricanes. During the period 1950-1975, 73 tornacces nave been reportea witnin 75 km (46 mi) of the site, giving a mean annual torneco frequency of 2.d and a computec mean recurrence interval for the site of 5,525 years. On april 17, 1978, a ternace traversea the plant site with wincs about 70 m/s (150 mph).

Further infor:aation on this tornaco can be founc in " Aerial Survey of Granc Gulf Plant anu Vicinity After the April 17, 1976 Tornaco" by ineocure Fujita, ShRP Research Paper 162, University of Chicago, May 1978. During tne period 1871 inrough 1971, 18 tropical storms or nurricanes passed within 80 km (50 an) of the site.

Freezing rain anc severe ice storms, while not common, occasionally occur in the area during winter. Relative humidity is generally nign throughout the year and heavy fog occurs frequently (22 days annually) in the vicinity of the site. The predominant winc flow over the site is from the eastern quadrant.

There are no unusual meteorological ccncitions at the site that have not aeen consicerec in plant design and siting. The require:aents to consicer onsite meteorolob cal concitions in 10 CFR Part 100.10 and the i

requirements in 10 CFR Part 50, nppendix A, General Design Criterion 2, to -

consider natural pnenomena have been met for meteorological parameters.

2.3.3 Metecrolouical Measurements Prouram nc ;nsite meteorological measurements program was initiated in August 1972.

A 50-meter (162 foot) tower was installed approximately 1,525 m (5,000 f t. ) nortnwest of the Unit 1 containment builcing.

Wind and temper-ature measuring instruuents were located d the 10, 40, and 50-meter (b,133, and lb2-foot) levels on tne tcwer.

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- - -.. - Humicity leasuring instru;aents were located at the 10- and 50-meter levels.

The applicant nas suomi::ec :nree yeers of data collected onsite (3/7c - 7/74 and 1/76 - 12/76), in joint f requer.cy f orm similar to :na; sus:estec in Re3ala: cry Guide i.23 ano ncurly avera3e cata on megnetic tape.

The cata recovery rate curing :ne nree-jear ;erloc ci recuru was over 95 percent.

The onstte meteorological neasurements system presently conforms to the guidance in Regulatory Guide 1.23 and provices acecuate ca:a to represent the onsite raeteorolcgical conoitions as recaired in 10 CFh Par: 100.10.

Tne ensite ca:a pros:ce an acceptacle casis for making conservative estimates of a mespheric ciffusion for design casis acci:ent and routine releases from the plant. To address the meteor-clogical requirements fcr emergency preparedness planning outlined in 10 CFR Part 50.47 and Appendix E to 10 CFR Part 50, the applicant (awaiting information) 2.3.4 Short-Ter.a (Acc1 cent) Diffusion Estimates The shcrt-term (less than 30 days) accidental releases from buildings and vents were evaluated by the staff according to the guidance provided in Regu atory 6ulde 1.145. Wind direction and speed measured at the 10-meter level and vertical temeprature difference (delta-T) between the 50- and 10-meter levels were used. A ground level release with a building wake factor, cA, of 1,222 mp was assumed. The maximum sector 0.5 percentile relative concentration (X/Q) for the 0-2 hour time period was calculated to be 1.5 x 10-3 sec/m in the WSW sector at the minimum site 3

coundary distance of 596 meters.

The maximum sector relative concentration at :ne cuter boundary of the low population zone (3,218m) was calculated to be 1.5 x 10~ sec/m' in the WSW sector for the 0-3 hour time period.

Tne computed relative concentration at the outer boundary of the low

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ppulation zone (LPZ) for the S-24 hour time period was 1.0 x 10-4 sec/m,

t or the 1-4 day period was 4.2 x 10-5 sec/m and for the 4-30 day period 3

h was 1.2 x 10-5 sec/n, all in the WSW sector.

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n j i The applicant's methcdology for calculating short-term X/Q values

]b was consistent with the guidance in Regulatory Guide 1.145, therefore,

'f the applicant's relative concentration (X/q) values were not significantly i

l ifferent from the staff's. The small cifferences are attributec to *.he

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cifferent meteorological and matnematical tecaniques usec by the staff anc applicant. The staff used a Joint frequericy cistricution of wind speec category, wind direction sector, ano stability class.

The applicant used actual hourly average data. The staff determinec the 0.5 percentile values 3l Dased on the frequency of occurrence of eacn wind anc stacility cate9ery, 7ij wnile the applicant rankec the actual nuurly X/q values. The staff's T

T calculatec snort-term X/Q values are usec in the accicent analyses presented it j

in Chapter 15 of this report.

T

%s 2.3.5 Long-Tera (Routine) Diffusion Estimates Ig Long-term diffusion estimates were made by the applicant and the staff using the constant mean wind direction model described in Regulatory Guide p

1.111, Revision 1.

A ground-level release was assumed. Open terrain a

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h recirculation factors (approximately equal to 4) were used by the staff in l

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the computer model; as a result, the applicant's offsite annual average

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1. 4 relative concentration values were about 4 times less conservative. The i

staff's X/Q and D/Q (deposition rate) values ere presented in Table 2.3-1.

ihe highest annual average decayed, depleted relative cor. centration at the 7

site boundary was 1.4 x 10-5 sec/m west-southot of the plant.

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The staff's values were used in evaluating the applicant's proposed gaseous releases and compliance with 10 CFR Part 50, Appendix I design objectives discussed in Chapter 11.2 of this report.

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