ML20125B873

Discusses Review of Facility Preliminary Detailed Environ Statement.No Gross Errors Uncovered in Dose Evaluations

ML20125B873
Person / Time
Site:	Monticello
Issue date:	06/14/1972
From:	Kastner J US ATOMIC ENERGY COMMISSION (AEC)
To:	Knighton G US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9212100197
Download: ML20125B873 (3)

Text

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ENVIRON, FILE (NEPA)

Docket No. 50-263 JM 14 W2 G. W. Knighton, Chief. Environmental Projects Branch #1, L REVIEW 0F MONTICELLO PRELIMINARY DETAILED ENVIRONMENT /1 STATEENT We reviewed the Monticello Preliminary Draft Environmental Statement prepared by Bate 11a. In the short time at our disposal we did not '

uncover any gross errors in the dose evaluations. L'e have to reemphasize that the dose of 140 mrem to a child's thyroid is unrealistic. In any case the nonagmented system and associated potential level of exposure cannot continue beyond this year.

Our marked up copy of the radiological impact section was transmitted to your Project Leader, J. Youngblood, informally on May 23, 1972.

. Jacob Kastner Jacob Kastner, Chief Radiological Assessment Branch', L cc: J. Youngblood, EP #2, w/ enc 1.

DISTRIBUTION:

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1. Dose t:0 the I ndiv_i d ual Tac persons t:: t liktb tc receive the highest radiation du e are l those who reside closert t" the site, po fishing, boating, or swit-cing in the Mississippi River downstream of the plant, and drink tilk produced at f a rts ne ar the p lan t si t e . It was assured that these individuals consured 7.3 kg of fish and 7.3 kg of molluscs

• per year 24 hr af ter they have been caught frem waters containing plant ef fluent water at about a 3 to 1 dilution. Tne annual total-body dose f rom consumption of these foods would be about 0.2 erem/vr.

Doses to the other body organs would be somewhat less as shown in Tabic V-5.

The individual who spends 500 hr/yr fishing fror the river shore-line harvesting his 7.3 kg of fish and 7.3 kg of molluscs would also receive an external exposure to the total body of about 0.3 erem/yr, principally fren cesium deposited in the silt along the shoreline.

Thoce individuals who spend 100 hr/yr swit:Ing in the parks which are within the plant boundary and downstrear of the cutfall would receive a dose to the total body of about 3 x 10-4 mren/yr. Canoers who use the section of the tiississippi River just downstream of the plant for a total of 100 hr/yr would receive a total body dose of about 1 x 10-4 crem/yr.

The Twin-Cities resident consuming 2 liters / day of water drawn f rom the Mississippi River below the plant would receive an esti-rated total-body dose of 0.1 cren/yr.** The total dose received f rc= all pathways associated with the liquid ef fluent of the plant (sunmarized in Table V-5) was estimated to be 0.5 cree /yr to the total body.

The taximum expcsure rate at the fenced boundary of the plcnt resulting f rom submersion in the gaseous ef fluent released from the plant occurs in the SSE direction. At this location the annual

,o y ( '" d averagecra[tmospheric ground level releasesdilution (i . e . factor fren the was calculated turbine building to b and gland scal) and 1.3 x 10-7 sec . g-3 ,or f stack releases (i.e.,

{A C' s,c 3c' frem the rcin ecndenser)) Assuming continuous occupancy the total-cody dose at this location uc uld be 1.0 tre /yr. The desc to the skin wculd be somewnat h!cher (2.2 mretlyr) beccuse of the additional i i

centributien frc tht bcta radiation I Fresh water nelluscs arc not now abundant near the plant due to a parasitic infection. Their use as a food item is illustrative but ual!kt 11.

• • ' Uni f o r: -! xing was as succ e cs wc5 a dilution factor of G.It:

h 45 c f; p1m.c flow i (4f.00 c fs rive r flor) .

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rate at an occuried location m crF at the I , c, P

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t.c a r.s t f a rrr u w :ocatt d U.t tilt

' hor Y d' .d ca r U ri (' 4 .u' ^ factor () 'O w 2.' y 70 ' sc -

ount level rele wes and 1.0 xW scch f er st a i re le ases . i Aw urine cent i r c 'u

accupancy, the dose tc th tot s!-L9 at ' l' ths 1c cation we* ' - N 0.65 cret/vr. The dose te the skin v uld be sonewbr'  : ru r C.3 nret/v r ) b( caan of the a d di t i on c- 1 cc-tribution f rr the beta radiation cf tne radfanuclides 3- rcci] e as ed .

this The annual avs ran <.ir conctnt ratium of ' " i l an c' f a m were es t ina:.c c to be !. 2 x 10-2 an? 2.5 x l'r pC1/r',

respectivcly. Ib es to thc thyroids of adalts an? ch::dren f ro f arr would inhalation of the 131 1 and 1331 in the air at this be 0. 50 and 0.60 trer./y r , re s pe c t i ve ly .

Tlu raximur conc (ntration of 13I I in tilk would also occur at this nearby ft.rn. The dose to the thyroid of an infant consuming tilt produced on this f arm was esticated to be f 7 nret/yr (ass uming that the cow grazed on f resh pasture for 5 conths/yr).

The dose to the thyroid of an adult consuring the same milk was estinatH to be 8 rret/yr.

l'ntil the cupmer.ted gcscous waste holdup systen is operational the desc to the inf ant's thyroid could be expected to be 140 crem/yr. However, based en experience during the first six nanths of operation this dose is esticated to be about S crem for the first year of ope ration.

The reason that the expected annual thvroid dose is not markedly {'

reduced following ir.stallation of the augmented radwaste systen is because a significant fraction of the iodines are released to the atmosphere via the turbine building vent rether than through the augmented systen. However , the applicant must assure that effluents will meet the require-ents of proposed Appendix I, 10 CFI 50, as forcalized.

'n combir.ed annual dose t o hypothetical individuals who would receive the rxt exposur( frcr the several different paths.nys ic- }

a.,c u t 1.2 nren to the tot al bcdy , alnest entirely fro, air- l t

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