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Divisitut of Reactor Licens itta SAFCTY AN.\lXSIS RKPORTS Reference in uade to the lettern of J.inuary 16, 1970, and rtirch 14, 1970, from Roger S. 1;oyd, As;istant Di rector for React or Pr o jects ,
- D:ll, to the 1:nvi ron:aoot a l Science Services Admi ni s t ra t ion re(juesL i ng comments on the followinc, safety analysis reports, respectively:
Vermont Yankee Nuclear Power St ation Final SafcLy Analysis Report -
Volumes I through IV dated December 31, 1969 Pilgrin Nuclear Power Station Final Safety Analysis Report Vo l u:nes 1 through V dated December 31, 1969 Limerich Generating Station, Units I and 2 Philadelphia Electric Company Preliminary Safety Analysis Report Vo l ume <. I through 5, dated FeLruary 26, 1970 Revleu by the Air Resource Environmental Laboratory, ESSA, has now been completed and their comments are enclosed.
C %
liiton Shaw, Director Division of Reactor Development and Technology
Enclosure:
Comments (O r i g . & 1 cy.)
cc: R. S. lioyd, Assistant Di.., Reactor Projects, DRL
- 11. L . Price, Director, R! G 06C6300056 860613 -
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Pilgrim Nuclear Power St,at,lon i i
Final Safet.y Analysis Report l Volumes I through V dated December 31, 1969 Prepared by Air Recource., Fnvironmental Laberatory Environmental Science Services Adminlut ratien ,
June 2, 1970 Nh Oncito mat.coroloc,ical at aticLico indicate that at, a lcvel of P.20 fcot abo'ce the nurface (300 feet, Mean Sea level) the annual mean wind c}med is 16 r.ph
' and the frequem'y of calmc; ic 0.43 parcent. At this level, ut.ahle (toderate and clicht) conditicna with enuhore winda and a speed cf 3 mph or lens
' (includind all calms) occur: leau than 1 percent. of the time. Conucouently, it wou3d be reasonable t.o conclude that, a diffuu'icn factor (7/0) equal to er greater than that equivalent t o Pacquill Type F and a wind cieced t f 2 n'/ece g would occur lecc t.han 5 percent of the time.
- .t For the elevated releases frca a ut,ack which in 100 m above the surface, the s* raechanion result ing in the higheat, ground concentration is either a rapid mixing dewmtard or a decrence in the effective at,ack height because of rining downuind terrain. The nearent, cite boundary, other than the shoreline, is.
at a dictance of 330 m went northwest of the stack where t,he terrain is about 90 n belew the top of the atack. In this cituation a very rapid diffusion (Pacquill Type A) with a uind speed of 1 rr./ cec and an effective clock he.ight of 90 m would renult in a relative concentrat,ien of 2 x 10~5 see m-J. Thc highest nearby terrain is touard the couth couthwest at a distance of 80L m and at 2200 m. In the former (Roadside Park on cite boundary) the terrain ic 40 m below the ntack and in the latter (Manoment Hill) it is at the stene elevation as the stack t op. In thic cituation the controlling condition cecca to be an inversion cendition with zero effective stack height at the distance of Manonent Hill and a wind speed of 2 m/sec resulting in a con-centrat, ion of 1 x 104 sec m-3 TheLiteinventicationofseIl breezes (Appendix I) verifies another mechaniu ,
that of fumication, which brings an elevated plw:.e rapidly to the surface.
I In the case ot' the nearcat nit.e boundary we have assumed the initial plume tr remain horizontal denpite underlying terrain, the wind speed to be 2. m/sec, the horizontal apread to be equivalent, to Type F and the mixed layer to be 90 m thick. The renulting concentrat,lon la 2 x 104 cec m-3 For a nurface release, the controlling condition would be an inversien b (Type F) uith a 2 m/ cec ulnd npoed. A1_ lowing a fact.or of 3 for the aero-dynantic effect of the building complex, t he result nearcat cite boundary of 330 m in 1.4 x 10-3 cec m~ijt g concent, ration at the 1 .
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The controlling onshore direction with regard to the averai/ autual concentration api; ears to be a uind from the nort.h northeast. to'.zarda the high terrain (ltoadside Park) at the site boundary. Anouming an effective atack height of 40 m, a 6 m/uce vind spced and a frequency of 3.S lercent each of unstable (Typ313) and neutral (Type D) ami a 1.0 percer.t frequewj;.
of inversion ('lh'ic F) condit.ionn (see Tables 2.3.3 to 2.3.6),1,1 < re 3 su l,t. i n i-average concent.rntion over a 2210 sector at COO ra van 1.6 . 10-/ 000 '^ 3 ~
In cu'anary, for the caueb list cd no co:npute the cunt raill:t coz.centraliens at offaite locationa to be as follo'.ic:
ElevaLed, O - 2 hr release - 2 x 10 ,* cec m '
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l Ground, O - 2 lu relen :e . 1.4 x 10 -3 "
Elevated, runiual relcane : 1.4 x 10-7 " .
The latter in in good agrecront with the applicapLi a Table E.O.16.
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