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## 1 0 Ste p 2 : FOR ASR C INTERNA LUS E ONL Y (PARTAo

fB )



## EP ADOCKE TID : 102RQ-R N

1 ) INDE X 3 ) 102RQ-RN-1- 2 5 ) 102RQ-RN-1- 4 7 ) 102RQ-RN-1- 6 9 ) 102RQ-RN-3- 1 11 ) 102RQ-RN-3- 3 13) 102RQ-RN-2-1- 2 15) 102RQ-RN-2-1- 4 17) 102RQ-RN-2-2- 1 19) 102RQ-RN-2-3- 1 21 ) 102RQ-RN-2-4- 2 23 ) 102RQ-RN-2-4- 4 25 ) 102RQ-RN-2-4- 6 27 ) 102RQ-RN-2-4- 8 29 ) 102RQ-RN-2-4-1 0 31 ) 102RQ-RN-4- 2 33 ) 102RQ-RN-4- 4 35 ) 102RQ-RN-4- 6 37 ) 102RQ-RN-4- 8 39 ) 102RQ-RN-5- 1 Ste p 3 : FOR ASR C INTERNA LUS E ONL Y CD : QA: 1 

## 2 ) 102RQ-RN-1- 1 4 ) 102RQ-RN-1- 3 6 ) 102RQ-RN-1- 5 8 ) 102RQ-RN-1- 7 10) 102RQ-RN-3- 2 12 ) 102RQ-RN-2-1- 1 14) 102RQ-RN-2-1- 3 16) d£2RQ-RN-2-l-5 ; 18) 102RQ-RN-2-2- 2 20 ) 102RQ-RN-2-4- 1 22 ) 102RQ-RN-2-4- 3 24 ) 102RQ-RN-2-4- 5 26 ) 102RQ-RN-2-4- 7 28 ) 102RQ-RN-2-4- 9 30 ) 102RQ-RN-4- 1 32 ) 102RQ-RN-4- 3 34 ) 102RQ-RN-4- 5 36 ) 102RQ-RN-4- 7 38 ) 102RQ-RN-4- 9 40 ) 102RQ-RN-5- 2

Ste p 1 : FOR ASR

C INTERNA LUS E ONL Y Ar e ther e more documents fo rthi s Docketi n anothe rbox ? /*YE S Y N O Til l ou tContinuatio n Shee tan d go t o Ste p 2
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Initials/Date : LD S / 3-8-200 7P. 2 

# Departmen to , Energ ylOU^-^X-hX Washington , D

C 2058 5 Augus t 17 , 198 7

Ms
. Barbar a Hostag e Respons e Standard s an d Criteri a Branc h Emergenc yRespons e Divisio n(WH-548B ) U.S

. Environmenta l Protectio nAgenc y 40 1 MStreet , S W Washington , D C 2046 0
Dea r Barbara : Sinc e myAugus t 5 , 1987 , lette r t o yo u concernin g th e modelin g assumption s considere d i nth e rulemakin g activitie s o nreportabl e quantitie s fo r radionuclides , I hav e mor e closel yexamine d th e base s o f th e depositio nmode l develope d byth e Nuclea r Regulator y Commissio nan d describe d i nRegulator yGuid e 1.111

. Althoug hI stil l conside r diffusivit ytheor y(the basi s fo r th e Regulator y Guid e 1.11 1 approach ) a bette r representatio no f actua l atmospheri c depositio nprocesses , th e assumption s (e.g. , a vertica l lin e source ) an d calculationa l technique s (e.g. , finit e differencing ) use d t o develo p th e Nuclea r Regulator yCommissio n(NRC ) methodolog y mak e th e depositio nrelationship s presente d i nRegulator yGuid e 1.11 1 unsuitabl e fo r applicatio nt o a distanc e o f 3 0 meter s fro ma n assume d poin t source . Th e NR C approac hwa s develope d specificall y fo r consideratio na t nuclea r powe r plant s wit hparticula r releas e characteristic s an d relativel ylarg e distance s (i.e. , severa l hundre d meter s an d beyond ) t o potentia l receptor s o f interest

. Extrapolatio no f relativ e depositio nrate s presente d i n Regulator yGuid e 1.11 1 t o a distanc e 3 0 meter s i s no t advisable

. Strictl yfro m

th e standpoin t o f makin g calculation s a t 3 0 meters , and no t considerin g adequac yo f modeling , th e us e o f a nassume d depositio nvelocit yo f abou t 1 centimeter/secon d appear s t o b e th e onl ysuitable , simpl e technique

. However , a s I state d i nm y lette r o f Augus t 5 , 1987 , i f depositio nfo r th e ingestio no f vegetable s an d mil k remain s a consideratio no f th e Environmenta l Protectio nAgenc yfo r th e determinatio no f reportabl e quantities , I believ e th e entir e modelin g base s fo r bot hingestio nan d inhalatio nwoul d hav e t o b e re-examined

. I nparticular , I woul d recommen d tha t a distanc e o nth e orde r o f 10 0 meter s b e use d fo r calculation s o f bot hai r concentratio nan d deposition

. Th e atmos

pheri c dispersio nand depositio nmodel s use d fo r th e inhalatio n an d ingestio npathway s wer e develope d t o b e use d a t an d beyon d 10 0 meters , and fiel d experiment s hav e bee nperforme d t o validat e thes e model s a t distance s rangin g fro mabou t 10 0 meter s t o severa l thousan d meters
. Extrapolatin g thes e model s t o a distanc e o f 3 0 meter s simpl yfo r th e purpos e o f performin g calculation s withou t regar d fo r th e physica l processe s involve d i s ba d scienc e wit hP. 3

- 2

-

poo r judgment

. A s I hav e state d previously , I recogniz e tha t non-modelin g consideration s ma yb e mor e importan t i nestablishin g th e distanc e fro m a nassume d sourc e fo r th e purpos e o f determinin g reportabl e quantities

. However , th e constraint s impose d o nth e model s fo r suc hinappropriat e application s use d shoul d b e full y recognize d an d considered

. I hop e thes e clarifyin g comment s ar e helpful

. Sincerely , 

# €

Jame s E
. Fairoben t Offic e o f Environmenta l Guidanc e and Complianc e