ML20207S240
| ML20207S240 | |
| Person / Time | |
|---|---|
| Issue date: | 06/26/1978 |
| From: | Hulman L Office of Nuclear Reactor Regulation |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20207S219 | List: |
| References | |
| NUDOCS 8703190178 | |
| Download: ML20207S240 (3) | |
Text
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JUN : 61978 j
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- " * - MDDRANDtM 70Rt Uarold R. Denton, Director * - -
Division of Site Safety and Environmental Analysis j 4
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' ~ ~~ ' ' ~ ~ ~ ' ~ -' "-
i .. FROM: L. C. Hulman, Chief j ..- .,a:; _.. . . . . c_ . . > .. Hydrology-Heteorology Branch . . f _. . . .
,'"*P *~. . _ . . . _
'. Division of Site S.afety and Environmental Analysis i
! THRU: '
Richard F. Denise, Assistant Director for -
Site Technology -
Division of Sit,e Saf.e.ty-
.- r-- and Enviroansotal Analysis
. . . . . , ~ . . , .
SUBJECTt COMME'1TS ON D. BUNCD'S MD80 0F JUNE 19,1978 RELATED TO THE DRAFT REGULATORY CUIDE, "ATHOSPRERIC DISPERSION
- . HDDELS FOR POTE:TIIAL ACCIDI21T CONSEQUEHCE ASSESSMENTS AT NUCLEAR POWER PLANT 5" ...
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.. -. -. On June 22, .197h D. Bunch, L. Soffer, E. Markee and I met to discuss ,. ,
D. ::unch's conmienta on the accident met model guide that was transmitted i ,,
to ACRS on June 12, 1978. My comments are related to both his cover memo and the specific comments contai,ned in his enclosure. With -"
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respect to the cover memo, it is my understanding that his comments *
.! ._.'.i ..~_ f 7 reflect what be considers to be "rachets". in aAte suitsbiliky w* ". *a,2 .n _ ...
..- assessments over what was contemplated when Part 100 was developed. - ... ,
rie.I'; our assessments of the future impacts of the proposed guide. arej;,y;g.. 4-:y
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M"9;~~the opposite, derschets generally, based on 'the SRP. ?Insofst as - :: :r.- ~. - .- .- ! ;
i there exists a need to jointly consider a,ccidents, source terms,%."-* ="W T/jmeteorological conjitions, and doses I would agree that the. proposed iggy.. !!
'P.-dd RgulatoryI cuide may not reflect sa appropriate level of conservatism. 4"*;. T"- . I
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.---* Rowever, do believe it appropriate to modify Standard Review Flan ~~
7^~~< of new experimental data, but I endorse the need for se overallproce
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"~77.'[ appraisal of riska for site suitability assessments. "I suggest you. -=y,g ' '
I W .4 consider the need for an interdiscip11pary task--~force to scope . . ..u.'ic'.A..
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~' s.uch.. ~.. . an undertaking. '..^, . .
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,_'.'.-f;$~.We s' gree with all but two of the specific comments ande in 'the ?.M.. .e Er2-' "
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enclosure to D. Conch's memo, but not necessarily for the same W.*CW l .
reasons. We will furnish OSD with clarification and editorial ~~~~~"~ " !
' " ~~ comments which we believe will eliminate all but two of D. Eunch's ' /.' cle. . . . . ' .
'u hd a h eoneerne. In further consideration of the guide it would be helpful . l;.16r*gn
' ."". if comments could be coordinated and resolved before transmittal " -~f-W "e
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070319017e 870313 PDR GRQ NRRC 1 PDR
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Harold R. Denton
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Specific cocuments on each of the... two .
areasn we .~
disagreelith ar'e'* ..s summarized .-
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below . . _ . . . . . . . -. . . . . . ...m.._.
- a. D. tunch's Comment No. 9: The suggestion was made that stack
,axit selocities be explicitly allowed in the Guide. The Standard . . :. _ . .
Review Plan procedures and the proposed Regulatory Guide do not explicitly
-" state that stack exit velocities are ~allevable. Furthermore. 'the staff *.. ,a, .
2.s cannot recall ever allowing credit for exit velocitiies in the past " -- " - -- ---
~e ight years. However, the Guidesdoes not preclude consideration of the factor, and if a case could be made by an applicant we would consider .. ..
'it*s use. . :
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' ' ' b7 D. tunch's Comment No. 14: The use of madam grovad level I/Q- -
values from stack releases at or beyond the exclusion boundary, we believe.
~ -
to be necessary for determining the acceptability of the exclusion ^---
area boundary where plumes can jump the boundary and result.in substantially . ',,
higher doses than would be inferred by use of exclusion area boundary v.w---- - --
X/Q values. Not identifying and evaluating ~~such hot spots could result', 'E .
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' we believe, in misleading the public. '~T .- .,...., _ ,._ , _. .
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