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{{#Wiki_filter:. Oc bu J E<. n a c.cc -6dd M%b l ..'11" loin 0 r.3 M ON 6 Q 6 Wt\\ a., a c.n .../ b.:QRANDLM FOR: Ai Schwencer, Chief Licensing Branch No. 3, DL I #'J : -James P. Knight, Assistant Director for Components and Structures Engineering, DE 'F70M: Robert E. Jackson, Chief Geosciences Branch, DE T 9 JECT: REGULATORY STAFF POslIION ON SEISM 0 LOGICAL INPUT PARAMETERS IN RELAfl0N TO MIDLAND 1 &-2 d
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Risad on our review to date the Geosciences Staff has adopted the attached p>sition with. respect to seismological input parameters for Midland I & 2. This position is necessary to resolve differences between the applicant and N C on seismological. issues and to provide guidance for inputing vibratory stion in evaluations of liquefaction potential and soil amplification. The ' xciences Brarch has met with the liydrologic and Geotechnical Engineerinn "..ach to-discuss.various methods that could be used to generate a response pectra for Midlend that would account for site specific problems. h'c are mnre that the 1pplicant is in the process of reanalyzing the Category I structures to account for cracked ccnditions and soil settlement problems, id that they have made some comparative analysis of their current response sr/ctrum (Modified Housner) and Reg. Guide 1.60 both anchored at.129 (being . nitored by the Structural Engineering Branch). It is suggested that the 6 r
- vplicant adopt this staff position and implement the recommendations.
F ./- ( /I E. Jacks $55 4 erb g on, Chief GeosciencesJranch l Division or Engincering
Enclosure:
As stated cc: w/cnclosure J. Kimball F. Schauer L. Reiter 0, liood T. Cardone R. Jackson J. One J. Knight L. Haller G. Lear ' F. Rinaldi 8408140242 840718 PDR FOIA RICE 84-96 PDR >t i m. c *E .j __ eie. -w ..a .+>m.m. =--,. e ~. e ~ -m e we e r e-- g 4
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. -. - ~. - - - j -.1 z,. ~ ~ -361.0 4 Geosciences Branch m [35 3', g, (2.5) ' m, .(Rsp)- W L The Mich'igan Basin (the region within which the site is located) is cons to be~a tectonic province by.the applicant. The Goosciences Branch staff '~ 1 practice is tnat the Central Stable Region _(CSR) cannot be subdivided into separate'tectenic_ provinces. The carrt.nt regulatory staff position specifies .g .c - (; ! i - a' controlling earthquake from the CSR which differs from that suggested b C '. 2;, applicant and addresses soil amplification problems, {. y .o r g.%y 4 l The con ~ trolling earthquake to be required for seismic design at the Midland Q V' site is similar to those occurring in Anna, Ohio (March 1937), and has a b p[~ i jb uve (mbtg) magnitude of 5.3. Nuttli, using an' alternative method, has V l also suggested that this magnitude is the "paximum" when using residual eve m t. 1. (those left over after seismic zones such as Anna, Wabash Valley etc ls g ., are , F--s removed) for the Central United States (State-ef-the-Art for Assessing Earthq {- Hazards in the United States, Report 12, Credible Earthquakes for the Central j[ \\ p p.. 4 - j p....; United States: Misc. Paper S-73-1, U. S. Army Engineer Waterway, Exp. Station,i f:d's t 1978). ' g; 3 - i f 1. Representative real time histories for M:5.3 t.5, R< 25 km at soil sites I., *.'. .should be collected for input into seismic design. I V_"_O This collection could iP come from Lawrence Livermore data (Scismic Hazard Analysis 1979) but it is,t-i suggested that you update this data set. ,I~>'1.2 -i 2 Y ** f 8i { .,l 4 3 n i. I d) '4 pi -{. k "Kj 1
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.~ p' y... f n VOF1{ Es 10wed fiort h h4 tvd 2. The 84th percentile (mean plus one standard deviation) response sp i .(from real time data set) should be used as input at the top till unit which consists of hery stiff to hard cohesihe soils Above this tillisasandlayerwhichishighlyhariableindensityandcompactedfill 3 The effect of soil'. amplification abohe the upper glaciar till unit shoult addressed in appropriate soil-structure interaction studies which wi theimposedhibratorymotionatthevariou'sstructuralfoundationlevels The NRC staff would welcome the opportunity to discuss with you the reas es of the results from the completed amplification studies. 3. The NRC staff is aware that you are reanalyzing the Category I structu,I to account for cracked conditions and soil settlement problems i and that you 7 have made a comparative analysis of your response spectra (MoI: and Reg. Guide 1.60 both anchored at.12g. I The input for this comparative f analysis was at tu foundation lehel whereas the establistied staff posit for this site is to require the acceleration at the top of the natural glacial till unit. You should assess the significance of this difference I l-andprohideadditionalresponsespectracomparisonsatthevarious foundation levels. t I o i 4 1 ~w %.*7"*".;-
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