ML070440356

E-MAIL: (PA) Scan001 (30).pdf

ML070440356
Person / Time
Site:	Pilgrim
Issue date:	01/26/2007
From:	Sowdon T Entergy Corp
To:	Emch R NRC/NRR/ADRO/DLR/REBB
References
TAC MD3698
Download: ML070440356 (4)

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Richard Emch - ScanO0l (30).pdf . Pa From: "Sowdon, Thomas" <tsowdon@entergy.com>

To: <RLE@NRC.GOV>

Date: 01/26/2007 12:52:28 PM

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ScanO01 (30).pdf

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44 1975 were estimated by averaging the two appropriate values from the preceding and succeedi years. Estimates for the missing eight mont_'s of 1972 were averages from the appropriate months of 1973, 1974, and 1975.

The wind-frequency data were related to the coapass directions (relative to the plant) associated with each relevant address and the years of residence (or employment), such that the percentage of time during each year of residence or occupation the address was da,,.rTwind cf.

the plant could be determined. Because wind from different directions would be expected to affect a given site, each mpss point was expaided by 45 degrees to determine the area of impact (e.g., the frequency with wtich winds blew from the North would be applied not only to residences and worksites situated due South but also to sites located within 45 degrees of the South *nass point). The practical effect of the use cf this method was that the frequency with which a particular site -was estimated to have been downwind of the plant was determaned via the summation of the frequencies associated with two of the sixteen cor..eass points. The contamirat-diluting effects of wind speed and turbulence were accuted for by including in the exposure asses-sent formula a factor for the distance of each relevant address from the plant and by applying the inverse square law. The formula used can be found in soppend4ix X.-

It should be noted that the fractions associated with the residence and worksite contributions to expsure relate to the typical distributior of tiime between work and hame. Most individuals will have occpied

y ARP EN DI X x EDaK)P.E ASS ESSý047 FOPMULA Expos'-'re S~ (a(2/3) (1/d2 ) b(13 (/

i= 1972-1986 Iz

',..ere i = the years bereen 1972 and t*he diagncsi. year exclu-iryg those assi.-.d for late-ncy C

a = the oercentzaae of the zirc v.-mr;.

re--iance ws dcl..'-,i of vhe piant d = the distance between the residence anidthe pia-.-: z:

the nearest quarter mile b = the percentage of the time during year i tna- -

worý.ite was dmnwL-id of tIhe plant c = the distance between the workusite and the pln,: tc-nearest quarter mile r2 X57

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