ML20207S238
| ML20207S238 | |
| Person / Time | |
|---|---|
| Issue date: | 06/23/1978 |
| From: | Hulman L Office of Nuclear Reactor Regulation |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20207S219 | List: |
| References | |
| NUDOCS 8703190173 | |
| Download: ML20207S238 (3) | |
Text
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.. _ _ .1 t JUN 2 31978 . . - . . : . J.
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MD(ORANDUM POR: 'Barold R. Denton, Director '-PT 7-~ '.""'*""~ ~ "
4 Division of Site Safety and Environmental Analysis
.. FROH: . L. C. Rulman, Chief . . . . . . . . .
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.. s Eydrology-Meteorology.Dranch, DSE. e.... @ Q. 4.. ~,.,..,c..,,.;
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THRU: . - Richard P. Denise, Assistant Director for @
- Site Technology, DSE
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12, 1978 DRAFT
~ ~~ T SUBJECr: ~."." ~ HHB COMMENTS AND POSITIONS ON JUN POTENTIAL ACCIDENT CONSEQUENCE ASSESSMENTS AT NUCLEAR 1.
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. .. POWER PLANTS AND VALUE-DIPACT STATEMENT" a . .. .n.. ..
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.We have reviewed the draf t regulatory guide .and value impact assessment .,4.; . ~
- transmitted to the ACRS on June 12, 1978. Extensive' comments soneerning ~" C ~
J . . I organization of the material, and clarification of the 'soncepts and 1. _. .. 7.~
i procedures presented in the guide will be supplied to OSD within the . ..
next week. The value-impact assessment does not support the guide in its present form. We will supply suggestions for improvement along ..
with our comments on the guide. .~...._- . m m.,. . '! __ _'..
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We have two areas of substantive staff disagreement with"the~gside ,. 7 ~
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The rationale for selection of sector prob. ability levels; . e
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As a result of the May 2,1978 meeting of the RRac, E.'O. Case approved -
- * '"an interim branch position that permitted limited ese of the Sep'lgebir 12."*"-
t~6.1977 draf t of the regulatory guide for licensing actions. .This drtit e ci.-
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of tEs ' guide specified a Trobability level of aboat'0.3% (equivalent to "*V.
^" ~"~ 27 hours3.125e-4 days <br />0.0075 hours <br />4.464286e-5 weeks <br />1.02735e-5 months <br /> / year) in the critical sector for 'selectime"of the I/Q value.~".7.M.'IT '
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- .['. , No decision was made by the RRRC concerning psp ' siternatives to 7.Q '
- . /;'., this sector probability level, and our understand 1ag la that. the staff.cg .;.,. .., ' ' ~ ~
was directed to perform an additional parametric study to provide .
.. .. ..". supporting information for the selection of a sector probability level. . Y. ..~ .
irmxI as the basis for a Commission paper on the model. " The June 12, 1978 rr M s
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7* ~ version of the guide specifies a probability level of 0.61 in the 7 '_% 7 @ " Y .
- ".u.. . wcritical
- sector with the rationale that this would ". produce I/q . values * * * * * ,
hich are on the average equivalent to those prodeced by previous m.%. k p*,m' ' ,
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Harold R. Denton
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variable site boundary distances". In our presentation to RRRC on '.
~ ~ May 2,1978, we estimated that the historical sector probability -Wl,{,*g -
level was in the range of 0.4 to 4.6%. We disagree with the stated bases .
j for selection of the 0.6% probability level as presented in the June 12, 1978 version of the guide. The most significant innovation in concept . . . . . . _
of the new model is consideration of directional variability of atmos- _
'pheric dispersion conditions and the subsequent calculation of.I/Q --49-7W .-
values at specifie locations. We believe that the most appropriate -' m --
basis for linking the direction-dependent Boncept with the~ direction ~~
independent approach should be a determination of what the direction- _
independent approach meant with respect to frequency of occurrence of
.. ..- - .the "5% X/Q" at specific locations around a variable exclusion area m, e~
boundary. Using this rationale with the information~ presented la~ the -
enclosed graph summarizing the results of the parametric study of 18 sites, we conclude that a probability level of 0.5% for critical sectors -f-
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- seems most appropriate. We view this probability level as a reasonable
~
- ' interpretation in view of the scatter of the data 'and the precision..of -- M... M. .' -
- the statistics. We note that use of the 0.6y, value produces sa ==2_:.lr.. ; .. ."'
average reduction in the X/Q values over those produced by the old *-'"F'-".~ .
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model that is roughly equivalent to the average reduction due to the o--
consideration of plume meander alone. . , ..
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The June 12, 1978 version of the guide also includes a proceidure for . . . .
- ~ a determining a direction-independent "overall- site" 5% I/Q as a limit _"g-te;____.
.. .. : . to the direction-dependent model evaluation. ',,The 'rationhle for the ~'~"*'"
l :. ci.Hdetermination of this "overall site" I/Q is not presented isthe~guideN.E~l-
--' "- We do not believe that the "overall site" concept is necessary because G i M *;
72
the link to the old approach.would be accomplished. through, selecti on of 7...T.p."the probability level for the eritical sector.a.In addicion ste thingM.q.37,.% ---.T
~; * ~ J," concept has no physical meaning to an individual l.o,e.m..d. at a,n.y Y.o_i.n.t..~ ..-.r s .
on the esclusion area boundary or LPf.. . . ..- ..:-...- .
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- .In conclusion, we recommend thht the new model be used at.a articial. .... A L sector probability level of 0.5% with the bases (rationale) as described er
--above, and that the procedures for determining as "overall site"_3/Q "- DF l
- be deleted from this guide. Furthermore, this probabilistic selection , fi_
procedure should only be considered as an interim step in the intended , gang.
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development of an explicit siting policy which incorporates the.
'M robabilities y of accidents, source terms, meteorological conditions _ .,.g; ,y; , ., ,
, and dose to man. .
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