ML20236B831

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Discusses Review of Progress by D Bernreuter,Lll,Re site- Specific Design Spectra for Plant.Related Figures Encl
ML20236B831
Person / Time
Site: Diablo Canyon, 05000000
Issue date: 04/01/1976
From: Gammill W
Office of Nuclear Reactor Regulation
To: Maccary R
Office of Nuclear Reactor Regulation
Shared Package
ML20236A877 List: ... further results
References
FOIA-87-214 NUDOCS 8707290251
Download: ML20236B831 (10)
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{{#Wiki_filter:.. i APR 1 1976 h Raymond R. Maccary, Assistant Director for Engineering. ,h Division of Systems Safety REVIEW OF PROGRESS BY DON BERNREUTER LAWRENCE LIVERMORE LABORATORIES REGARDING SITE SPECIFIC DESIGN SPECTRA FOR THE DIABLO CANYON NUCLEAR POWER PLANT l 'Four subtasks have been performed: l 1. Test of v/a for all components and for vector components of available strong motion seismograms recorded on hard rock. 1 2. Test of peak v as in (1), t 3. Test of spectral shape for various magnitude earthquakes recorded I from nearly the same epicenter at the same strong motion seismograph. 4. Test run of SHAKE through geologic section beneath Diablo Canyon beginning with sof t mudstone below hard sandstone upper layer. Summary of results: 1. v/a graphs did not show a strong trend whether plotted as single component values or vector values. See for example figures 1 & 2 for soil only and rock respectively. 2. v vs a graphs, for example, figures.3, 4 & 5, show a trend especially where vector values.are pirtted. Because peak ) values seldom occur at the same plac? in the record, the { vector value is assumed to better represent energy in the j seismogram but the actual value on a single component is less j than the vectored value. The ratio of vector values of velocity at lg acceleration for rock and soil can be compared I to determine the limiting rock velocity compared to previously determined overall liniting velocities. Tentative results are .50/.85 for vectored hard rock velocities over soil velocities. (see figures 4 4 5) or a factor of.58. This value times the previoualy established eingle component soil maximum velocity of.48 inches per second yields a possible 28 inches per second upper velocity bound for hard rock. This agrees with the value recommended by Dr. Newmark. Additional analyses and studies to clarify the nature of foundations under strong motion recording stations may modify results. 3. Spectral shapes for various magnitude earthquakes having the same i I I I 8707290251 870721 ) FOIA PDR PDR CONNORB7-214 ~ i

2 R. R. Maccary APR 1 1976 or similar epicenter and recorded at the same strong motion seismograph were prepared. Results, for example figures 6, 7 6. 8, show that the relative amount of short period vibrations in small earthquakes is much larger than in large shocks. Thus scaling up the response spectra of small shoeks to obtain the spectral envelope of large shocks is l in error. The large earthquakes have much higher long period i spectral responses components but the short period (high frequency) components increase only slightly over that for small shocks. This is an important obrarvation. Detta are few but do provide a new technical argument for not increasing l high frequency spikes proportionately with magnitudes as implied by USGS Circular 672 which has been recommended as a basis for Diablo Canyon design. These data are directly from the computer with no opportunity for adequate labeling. I

44. No computer print-out was supplied for the SHAK1 experimsnt considering nudstono beneath sandstone at Diabic Canyon. A more precise study is expected in the future. Ere11minary results, however, indicate that there may be a fortuitous geological cituation which will reduce expected shaking levels.

The method requires measurements of deeper layer properties. / currently unavailable, for accurate results. Additional computer experiments were performed in comparing i Reg. Guide 1.60 spectra with recorded spectral shapes and plots of velocity vs distance by rock type. The initial experiments with the latter dcta vere not conclusive. l Original Signed by W. P. Gammill DISTRIBUTION: Villiam P. Gammill, Assistant Director CENTRAL FILE for Site Technology NRR RDG Division of Site Safety and GSB RDG Environmental Analysis I i i I l I I i l 1 l DSE:GSB@el DSE;GSB D : T ovencE 9 ~ { RHofmann:sb JC g l 3.////76 3g/ /76 J//76 o.v.

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