ML19220A809
| ML19220A809 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/25/1975 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Muller D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904240635 | |
| Download: ML19220A809 (7) | |
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SEE 2 5 T5 D. R. Muller, Assistant Director for Environ = ental Projects MUIE02CLOGT SECTION FOR DRAFT ENVIR0hmiAL STATEME','"
PLAh"r NAME: Three Mile Island Nuclear Station - Unit 2 LICENSING ST2GE: OL DOCRET NUMBER: 50-320 MILESTONE No.:
33-32 RESPONSI2L2 BRANC3:
EP-4 REQUESTED COMPLETION DATE: September 23, 1975 APPLICA'iTS RESPONSE DAT2 h"4CESSARY FOR NEXT ACTION PLA.'CCD CN PROJECI: N/A DESCRIPTID'i 0F RESPONSE: None RIVIEW STATUS: Meteorology Section (SA3) - Complate Enclosed is the Meteorology Section input for inclusion in the Draf t Environmental Statement on the subject site.
This input was prepared by L. Andrews and R. Kornasiewicz, Site Analysia Branch TR.
' % es q H. R. Dentan,
Harold R. Danton, Assistnnt Director for 31fe Safety Division of Technical Raview Office of Nuclear " actor Re5ulatien Enclosura:
DISTRI3cTION:
As Stated DOCRET FILE.
NRR RDG cc: w/o anc1:
SA3 RDG R. Boyd W. Mcdonald J. Panza:sila ec: w/ enc 1:
S. Hanauer L. Andrevs R. Heinacan R. Klecker H. Danten D. Eisenhut D. Crutchfield M. Williams SS Branch Chiefs S. Varga r-(1 044 W. Regan J. Norris R. Karnasiewicz TR:SA3 Y_7 TR:SA3.R A] TR:SA3{
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METROPOLITA'i EDISCS CC"PANY THREE !!!LE ISLAND '!L' CLEAR STATICN - L' NIT 2 DCCKET Cf3ER 50-320 2.9
.ieteorolo;-
2.6.1 Re2ional Climatolocy The cli= ate of scutheastern Pennsylvania is primarily continental in character. Although the proxicity of Chesapeaka and Delaware 3ays, and to a lesser extent the Atlantic Ocean tends to exert a modcrating influence on air 05:peratures over much of the regicn, these effects are vaak as far inland as Harrisburg. Continental polar air, originating in Canada, is the predo:inant air mass type over the region in winter.
However, these air = asses are usually =odified and warred socewhat as the air descends the eastern slopes of the Appalactians before reaching the southeastern section of Pennsylvania.
Maritime tropical air = asses, wit".
origins over the Gulf of Mexico or Carribbean Sea, preds:Inste over this region in su :er.
..in;ers are r21atively mil for :ne latitude while sucrers are war and hurid.1 Te peratrres of 90F or higher =ay be reached on 20 cc 25 days annually over the region while te=peratures of 0F or lower may be expected on only one or two days.
On approximately 103 days annually, te=peratures of 32F or 1cuer may be expected.
Precipitation is genera lly well distributed throughout the year, but the greates t
=onthi, a=ounts occur in su= er, associated with thundershowers.
On an annual basis, relative humidity averages around 70 percent.1 2.6.2 Local Meteorolorv Long ter: weather records fro: Harrisburg, Pennsylvania record the extrece maximu: and =ini=u: terperatures as 1C7F in July 1966 and -14F in January 1912. Maxi =u: 24-hour pracipitation totalled 12.55 inches in June 19 72 and =aximu 24-hour snowfall :otallec 21.0 inches in January 1945.1 The annual sacwf all normal for Harrisburg is 37 inches, while free ing precipitation averages two to three days per year.
Heavv fog (visibility one-cuarter of a mile or less) occurs an average of 21 days annually.1 Onsite wind data at the 100-ft level (10 ma:ers above narrby obstructions) between April 1971 and March 1972 and aetween September 1972 and September 19'3 indicate that the predo inant wind flow is northwesterly with a frequency of,9. 3%.
'inds from the north-northeast are leas: frequent (2. i? -
'iG 045
2.6.3 Severe Weather Most severe weather occurring in the Three Mile Island cita
,icinity is ass;c.a:el.-ith severe :hunderstarts or intense large scale winter s:::: systers.
Tropical s:or:2 and hurricancs affect the Three Mile Island site infrequently.
Within the one degree latitude-longitude square in which :he site is located, twelve tornadoes were reported between 1955 and 1967.
This gives an annual nean frequency of 0.9 and recurrence interval of 14C0 years.3,4 Hail three-quarters of an inch in dia=e:er or larger was reported on si:<:een occasicas during the 1955 through 1967 period within the ene degree square and twenty-nine windstorns were reported with speeds of 50 knots (58 =ph) or greater.3 3etween 1371 and 1974 thirteen tropical stor=s or hurricanes passed within 50 =iles of the site.3' In Harrisburg, the.2::inus "f astest =ile" recorded was 63 eph.*
Frca 1936 throu;h 1970 there wer2 35 case; af air at:;n :ica.._:
las:cd f:ir or 2;re :ys in the r ;2;r in.. _ c.
the T:1r e = '.__2 site is located.'
70'04G
References for r.
_.o 1.
C. S. Department of Cc erce, Environmen:al Data 3ervice: Lccal Cli=atc1:gical Data, Annual Surmary with Comparative Data -
Harriaburg, Fa.
Published annually 2.
Metropolitan Ediace Co.,
1971 Supplemen: 11, invirer.: ental Report, Three Mile Island Nuclear Station - Unit 2.
Docket number 50-320.
3.
SELS Unit Staff, National Severe Stor s Forecast Center, 1969:
Severe Local Stern Occurrances, 1955-1967. ESSA Technical Me=orandu U3TM FCST-12, Office of Meteorological Operations, Silver Spring, Md.
4.
Tho=,
H.C.S., 1963: Tornado ?robabill:ies. Monthly Weather Review, October-Decetber 1963, pp 730-737.
3.
C ry, G. W., 1965:
Tropical Cyclones of the North Atlantic Ocean.
Technical Paper No. 5 3,
c'. S. Department of Commerce, seather Bureau, Washington, D. C.
- 3. aepartment of C:: er:e: Trepical 3:or; and A:Imn:__ M.urricaae Articles from the Monthly Weather Review. Published scathly thecugh Dece=oer 1973.
7.
Korshaver, J.,
1971.
Climatology of Stagnating Anticyclones East of the Rock:. Mountains, 1936-1970. NOAA Technical Memorandua ERL ARL-34, Silver Spring, Maryland.
'/O 047
6.1.3.2 Pre-Coerational Casite Meteoroloeical Prozra Meteorological da:a collec:ica began onsite in May 1967 with the installation of a 120-i: ". i g h, 22stru._n:ed -'/: _m.u:
l!00-ft south cf the Unit 2 containment structure.
aind speed and direction were easured at the 100-ft level on this :ast.
In October 1970, this mast was relocated to a position approximately 1730-ft southeast of the Unit 2 containment. 'lind speed and direction continued to be =casured at the 100-f: level on this cast until it was deactiva:ed in June 1972.1 At the same time that the 100-ft =as t was coved frc: its original position in October 1970, another 150-f t high neteorological tower erected on the northern end of the Three Mile Island beca e operational.
Located 2200-ft north of the Uni: 2 containment building, this tower is currently in operation at the site.
Wind speed and direction are ceasured at the 100- and 130-f:
levels, a:bient air temperature at the 25-ft level, relative ht:idi:y at the 130-ft level, ::1 vertical carrerature difference between tha 23-and 150-f: levels and between 30- anc 150-ft levels on this tower.
In addition, horizontal and vertical wind fluctuations are =easured at the 100-ft level.
In Oc:cber 1971, the vertical te perature gradient =casuring systa= was replaced and upgraded.1 The present wind speed and direction easuring instruzen: installed at the 130-ft level does not =ce: the specifications reco:: ended in Regulatory Guide 1.23.,instru=ent Because of the limited space available on the island and the nu=erous structures associated with the plant facilities, the lecation of the lowest wind sensors the 10 =eter above ground level as recommended in are not at Regulatory Guide 1.23.
Instead, che 100-ft level of these sensors places the: at a height 10 meters (33-ft) above nearby trees which reach heights of about 70-ft.
This placemen does meet the intent of Regula:Ory Guide 1.23.1 Tha applican: has provided joint frequency distributicas of wind speed and direction by atmospheric stability class (based on vertical terparature difference) for two one-year periods of da:2 record (4/71-3/72 and 10/72-10/73) collected casi:2.
Th e wind speed and direction ceasured at the 100-f: level and reduced to represent conditiens at the 32-ft level, and the vertical temperature dif ferance be: ween the 30- and 150-f: levals were the bases f or our dispersion es timates.
The joint reco"crj rate :cr these data :or the :No years of recora. cas
-,.?
ev a
Gaussian diffusion model, assuming a ground-level release with adjustments for building wake effects cas used c =cke our estimates of relative acrospheric concentra:i n (X/Q) values at the ' carious distances and directions frc the sit 2 as specified in.5ecti:n 3. 3 70-048
. 6.2.4 Ooerational Cnsite Meteorolocical Prorrnm "eteorological data collection is cantinuing ansite.
Anothar ona full year period of data record, eith a recovery rate of at less: 90~, is to be made available to :he staff at the end of :h2 anmtal data collectica period in early 1976.
The applicant has made a ec=21 :ent to modify the onsite reteorciogical progran during the su= er of 1975 so that it will f urther conform with the recc= endatiens cf Regulatory Guide 1.23.
It is intended that neteorological data collection ensite will continue through-out the entire period of plant operation.
70--043
A 9BF References for Section 6.2.4 1.
Metropolitan Edicen Co., 1974: Final Saf ety analvs 3 Repart, Th:2c
'iile !aland '.uclear 5:stion - Jni 2.
Dacket nuncar 30-3;0.
2.
U. S. A:ctic Energy Cc==1ssion:
Regulatory Guide 1.23 (Jafety Guide 23), Onsite Meteorological Progra s.
U3AEC Directorate of Regulatory S t:ndards, Washing:cn, D. C., 1972.
3.
U. S. Atomic Energy Cor=ission, 1974: Regulatory Guide 1.42.
Interim Licensing Policy On As Lou As Practicable for Gaseous Radioicdine Releases Fre Light-Water-Cooled Nuclear ?cuer Reactors - Revision 1, Appendix 3 - Procedures for Calculation of Annual Average Rela:ive Concentra:icas in Air.
USAEC Dir2ctorate of ?.egulatory Standards, Washington, D. C.
70 050