ML20090A090
| ML20090A090 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/15/1979 |
| From: | Schauer F Office of Nuclear Reactor Regulation |
| To: | Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17198A223 | List:
|
| References | |
| CON-BOX-13, FOIA-84-96 NUDOCS 7904050181 | |
| Download: ML20090A090 (3) | |
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'"Ib UDCUMENT CONTAINS i
P00R QUAUTY FM c' -
MAR 15IN3 "N
E105MCUT FOR:
- 3. A. Yarga. Chief Light Water Reactors Brancn $4 Olvisim of Project ktnagtrent F?dQf7:
Frsaz P. Sdianer. Chief Structort.1 Ecgineerina 2rasch Divisim of Systans Safety SctQECT:
MIDUus PLAAT - SETR.DCT OF THE DIESEL &DiERATCR 3tJILCIN ($C: 1120) ur h$e reviewed the structural aspects of the dfe:e1 ger. orator building settlicent 1ssee, 'JH1 m find.that edsttional infon:ation is required before ve em complets our review. It* additional information required, uhtch concarus strwtaral asoor.ts it contafred is the enn:1osure.. This revia has been cglettd h Mel Hafix o'section a of the structural Engissertog Branch.
J Fran: P. Schsoer, Chief
$truct: tral Engineering Bratch i
olvistop of systau Safety
Enclosure:
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- 41;LA 43 *i;C:.IAR PLA!iT STRL'CT'.'RAL E::G:'lEERI!!G 3RA'iCH 130.25 Indicate, in ;eneral, nhether the predictable different al set:1ertent (3.8) was censiaered in the design of all Seismic Category I Itrt.ctures, and
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if so, state how tne effects resulting fecm this differential settlemnt was incluced in the postulated load ccebinaticns 'or these structures.
An acceptable procedure is to censider the effect of the differential settlement as part of the dead load and to use the SRP 2.3 load ccm-binaticns in cenjunction with appropriate ACI Code crite-ia.
130.26 For al1 Seismic Category I Structures (including, but nct limited to (3.8) diesel generat:r building), which are 1ccated en :4ckfill and exper-tencing settlecents in excess of :nat ;<edic:ad, :rc,ide an evaluati:n of the ability of these structures to withstand the increased ciffereat:11 settienent. For the diesel generator building anc/or anf Seismic Category I Structure, which exhibits cracking, evalua:e the effects of the existing and/or anticipated cracks on the perfor ance of :ne intended faction of these building.
An acceptable ;rocedures of evalsaticn is use the load crbinations of SRP 3.3 and the accrooriate ACI Code criteria in :enjunctico 41ttr-Regulatory kide 1.60, 1.61, and 1.92, and
- ne ccesi:eration cf :te soil-struct;re interaction between the structure and :he sue:ce:ing media. The :siculated stresses fcr Seis:ic Cate;cey : 5: uc:gres at l
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critical locations should be tabulated and compared to that of a11cwable stresses as stated ;.1 the apprcpriate ACI Cedes.
130.27 For all Seisnir. Category I Structures, whic.* are cartially 'ecated an (3.3) 3ackfill and partially 1ccated on clay, provide a detailed evaluatian of the ability of taese structures to withstand the differential settlement. The possibility of not having a centact surface between the structures and the backfill should be censidered, other*, vise, it should be precerly justified.
- he acceptable procedure is to use the load combination of SR? 3.S snd the appropriate ACI Code criteria in conjunction with Regulatory 3uide 1.60,1.61, and 1.92, and the consideration of the soil-structare interaction between the structure and the succorting media. *he cal-culated stresses for Seismic Category I Structures at critical 1ccaticns snould be tabulated and ccepared to that of 111cwable stresses given in the appropriate ACI Codes.
130.23 Fcr all Seismic Category piping anether buried er net, provide an eval-
'3.7) uation of these piping to withstand the predictable and/cr the increased settler:ent. The differential seismic anchor ovement should also be considered.
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