ML19256D320
| ML19256D320 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/29/1970 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910170827 | |
| Download: ML19256D320 (4) | |
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JUL 2 31970 P. A. Morris, Erecte Division of Rea:te Licensing TFREE MIIE ISIAND NLIAR STATICH - IMIT 1, DOOCT do. 50-289 Adequate responses to the analM request for additicnal infor-mution are required before we can a:mplete our review of the subject appliMm. These requests, prepared by IRS and the IRS 94-ic Consultatts' Newmark and Hall, concem the mai-ia analysis of structures, systaus axi w-d. boundary, pre-sented in M= 5 of the apalia=+1= and GAI Ikport No.1729 entitled, " Dynamic Analysis of Vital Piping Systems Subject to 94=ia Motion.'
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- l.
List all Categorf I (Class I in PSAo] structures, systems, and ccrponents and the associated method of seisric analysis (redal analysis response spectra, rodal analysis ti..e-bister/, equivalent static load, etc.) or in lieu of seismic analysis the empirical (tests) anal 3 is for the design of Categor/ I ite::n,
including applicable stress er defomatica criteria and damping which will be used. Provide a brief description of all rcthods that are used for analysis.
- 2.
Two methods of seismic analysis used for Class I piping are des-cribed in pages 5-75 and 5-76 of the ISAR which are characterized as a response spectrun approach and a lumped mass recdal analysis technique. Identify all Class I piping analyzed by either or both of these methods.
3.
Indicate the marner in which the vertical seismic excitation wac empc.oyed in the seismic design procedures; i.e., whether a constant inertial static lead was used (specify value) er appropriate vertical anplification was incorporated in the analysis, as being equivalent to the horizental seismic analysis.
The following information requests are specifically related to GAI Report No.1729 "Dynatric Analysis of Vital Piping Syste-s subject to Seismic Motions", referenced in the applicatica.
- Comoir.ed DPS staff and censultant ccm.cnt (NewTarx and liall letter of July 8, 1970).
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. 4.
The GAI Faport No.1729 contains analyses which relate to rrathods identified in " Seismic /Ealysis of Equipment Mounted en a Massive Structure", J. M. Biggs and J. M. Pcesset. Submit a ecmparison for a single degree-of-freecom system, including the basis for and the conservatism in the use of this rathod, and demonstrate equivalency to a multi-mass time histe:y IretFcd.
Alternatively, other theoretical trethods or experimental analyses and tests may be submitted in justificaticn of the use of the proposed design method.
5.
Provide the design criteria which apply to the dynamic analysis of valves and other in-line system corponents which by virtue of their geometry and size introdum significant torsional marcnts into the piping system.
6.
Provide the design 'riteria and analytical procedures 'inich apply to piping and whic). takes into account the differential movement between flocrs at different elevations.
7.
The mass of equiprent and piping and the ccmpliance of the found-ation my participate jointly in the response of the system.
Provide the criteria used in fomulating the system analysis which
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takes into account these predominant mass and fcundatien compliance effects.
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8.
In phase or out-of-phase displacements at different elevaticns betwee..
iipant) piping and the building ray produce high stresses er defomations in connecting piping. Pmvide the criteria and analytical precedure used in the system analysis to account for in-phase er out-of-phase displacement of the building, equipment and piping.
9.
Provide the design criteria used to compute shears, rcments, stresses, deflecticns and or acceleraticns for each rode as well as for the ccxnbined total response, including the criteria for combining closely spaced model frequencies (e.g. nuTber of redes having frequencies close to that of the fundamental frequency).
- 10. The presentations of the methods of dynamic analysis are general s
and the precise techniques used for the system and piping analysis are not sufficiently described to pemit evaluaticn of their applicability and design cens.ervatism. Previde sufficient detail conceming the methods and precedures used.
- 11. Identify the codes referred to that are used for the ccxtination of seismic and other stresses.
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