ML20137D849
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hatch 14, 1978 3
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Mrs. F. M. Allen, Prc0ident Sorth Imna Environmental Coalition l
112 :is11 mark North Driarcrest Gardens
!!crshey, PA 17033 Lerr Mrs. Allen:
In response to your letter to Mr..Mycr Bender, Chairman, ACfC, deted l
acnucry 4,1976, tiac Comittee has asked that the following informa-tion be protiSed to you.
l 1.
de Co.;.iittee con Idcred the :ricrocarthquaker detected by the C CO not in the vicinity of the North Anna Paa r Station in it.1 review and approval of this fr.cility. 2 0 additional in-for.= tion recorted sincc the Comittee revised this project i
ha: 'uten brco3ht to the attention of the memberc. Desed on conents froi UGC0 representatives, as noted below, the Com-i
'g rittoc continut-s to trlieve thet these n.icroceiric events do not indicate the presence of a significant risk to tho i
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horth Anns station.
2.
Ieprc ent tives of the USGS have exw ined the nicroseiric hic. tory in the vicinity of tne Horth Anna Station, includir$9 the ir.toration you brought to the Ccrnittee's attention, and b not consider thic date unusual or indicative of any pcrticulcr proble:c.
3.
We A~.JS he:: not Octoved a " design deficiency" for the Nortn f.nna Station. 'ihe ACE 2 has examined the fectures of the !iorth Anne site end the plant scist.ic decian and has i
l concludc6 that the scismic design values of 0.129 and 0.109 as applied to tne North Anna Station are adequate.
In its reuort of Jrnuary 17, 1977 the Corittee concurred in gon-i eral with the reco=cndations of its concultants that a minirun cafe chutdown ecrthquake of 0.2g acceleration shcmld ordinarily be utilize 1 for new plants in the Eastern United States for wnich construction permit replications are su%
mitted in the future, although the Com.ittee believes that e
ficxibility in this nominal floor is appropriate to allou for special site conditions and specific aspects of plant 8608230063 %0722 PDR Fogg j
DELL 85-363 PDR l
aave t.
j W u.e.novenummer peewfine erraces sete.ese see
! pass Asc.31s (Rev. 9 95) ABCM 0240 v -, -
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.ra. P. ti. Itller :trch 14, 1978 design for hich site dependent spectra may be 1:rcortant or for situctions where a cound and noncontroversial basic exists for setting. lesser eriteric.
4.
'Ihc revios by Mr. J. Knight of seismic design margins in systems rec;uired to accoTplish safe shutdo.m ard safe shutdown heat re-r:cvs1 is continuing. Mr. Knight provided a report to the Com-rittee on the status of this work 6uring its 215th meeting., which you attended.. i,c expect a final written rcoort frcra Mr. Knight on thic ite.5 witnin one or two months.
5.
'1hc cv luction of seismic design m0rgins has not yet been com-plet:d, cc noted cbove.
I understand that the /SLB on ticrth ic.na Unitt 1 and 2 iscued its decision regarding an Operating Licence for this facility during February of this year.
Sincerely, P. F. Fralcy D;ecutive Director bcc:
ACRS Members H. H. E. Plaine J. Knight, NRR L. Crocker, NRR l
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RECORD NOTE: Based on discussion by the FILE: C orth Anna l_L 2 d ACRS during the 215th ACRS meeting & by CR'2-4 R. Fraley & M. Libarkin with J. Knight on 3/13/78 & 3/15/78.
Dr. Lawroski con-I curred in this ltr. by telecon on 3/14/78.
L Also, Mr. R. Devine of the USGS concurred in this ltr. by telecon on 3/15/78.
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I ACRS o,e....
i TRALEY/NT 3/15/78-
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Forms ABC 318 (Rev. p.53) AICM 0240 W u. s. oova n ant paintine orrecan to,4.ose tes