ML19317G695
| ML19317G695 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 06/19/1972 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Davis E SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8003260825 | |
| Download: ML19317G695 (3) | |
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M1I DISTRIBUTION:
B. Buckley A. Schwencer fffft Docket (50-312) 4 RP Reading Docket No. 50-312 PWR - File S. Hanauer R. S. Boyd R. C. DeYoung D. Skovholt
.F. Schroeder v.
Mr. I. K. Davis, General Counsel R. &ccan D. Knuth Baeramento Manicipal Utility R. Tedesco a Distritt
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Dear Mr'.'Devis:
s Project Leader (ADromerick)
Na Br Enclosed for your information is a request for additionaS inEvnormation forwarded to Bechtel Corporation concerning their topics 1 3epert 7-entitled " Seismic Analysis of Structures and Equipment for Nuclear Power Plants" BC-TOF-4 dated April 30, 1971 and referenced in your
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m g@. 2; Final Safety Analysis Report for the Xancho Seco Nuclear Generating Station.
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s EEOUEST FOR'AIDITIONAL INFORMATION'
" SEISMIC ANALYSIS OF ST2UC"U2ES AND EQUI?ENT.
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-FOT NUCLEAR ?CUER PLANTS" 3C-TOP-4 DATED APRIL 30. 1971 l'.0, S2ISMIC SYSTDI 3'.%'IC ANALYSIS
- 1.1 If a ~ simplified lumped ~ cass and soil spring approach 'is used to charte:arize soil structure interaction, justifica: ion should ha'submi::ad for soil sensitive sites. The use of 1 equivalent soil springs for tha seismic systes =athe=a:icc1 models may produce a pronounced. filter 1ng cf the ground motion response caplitude end response frequencies due to sensitive soil part:2:crs. -The bcsis for the use of a lumped parc=e:er
- ht:stical codel'(or equivalent method), including the use
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'of ~ parametric studies which evaluate possible varictions in tha site soil properties (e.g., moduli, density, and stress level) should be provided.
1.2. Tha stress ned deformation criteria thct will be used to consicer :he differential seissic movamaat of interconnected
.co ponca:s be:ueen floors should be provided.
. l.3.Tha ca*. hod.cnployed to consider the corsicnci acdas o" vihrc:1cn in 'tha saisnic cnalysis lof cha Cisas I (scia ric) building structures should be described.' If static fae: ors
- are used. co account - f or. torsional accelercctons in ' the sais=ic design of Class I (seismic) s:rteturas, this pro-4 cedure:in lieu of a combined ver:ical,1.trizontal, and torsional cultimass systes. dynamic analysis should be just-ified.
~ 1.'4, The dynamic =ethods and procedures used to determine Class I
"(seismic) structure overturning comen:s should be proviced including-a description of the procedures'used to account for soil. reactions and vertical earthquake effects.
1.5 The.' analysis procedure folloued to account for the danping in
- differant elements.of 'the model' of a coupled.sys
- en should be described including the criteria used to account:for cosposite
' dsoping.in a coupled. system with diff erent elements.
l.6' The usa of the. formulas siven in Table; 4-2' of 3C-TC?-? for i
calculatingLthe damping f.or tha soil-structure interaction
. analysis cay result-in axcessive dcaping for the soil in the l
s horizontal and'ver:ical direc ions.. Provide the justification
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'for'the useLofLthis high damping value isstead of using a more appropriate' critical da: ping; factor.
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2.1 Tha -cri:eria for ccebinin; todc1 ra:ponses (shacrs, monan:s, strassas, deflactions, and/or cecalarctions} w. are nedcl fre-c.uencies are closely spccad cnd c rasc.onsa spectrum modcl anclysis ma:hsd is used should be providad.
2.2 Tha daai3: cri; aria and analyticci procedures cpplicabic :o pip n; thc: accounts for the rela:iva displace:ancs be waan pipins - suppor: poin:s, i.e., ficers cnd compcnonts, a: dif-farant clava:ica uit' in a building and betweca buildings a
shculd be provid:d.
2.3 The criccric for cochining todal respensac (shaars, = sten:s, strascas, dcflections, and/or cecaleraticns) unara odci 1 -
fraquencias are closely spcced crd raspense spectrun todal anclysis ca:hed is used.should be provided.
2*.4 -The cri:dria chct will be enploy:d to accoun: for tha
- orsional affacts of vcives cnd c:har eccan:ric massas (e.g., vcive operc: ors) in tha saismic piping cnclyses should he provided.
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