ML20148T806
| ML20148T806 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/05/1978 |
| From: | Seed H AFFILIATION NOT ASSIGNED |
| To: | Wright R Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-CT-1062, NUDOCS 7812060086 | |
| Download: ML20148T806 (2) | |
Text
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ll b e, t - October 5, 1978 gg C /Of 2_. l* kCCLIVID ADYlSORY CO:G:nygg o3 5 EEACTOR SuccpAap3 g,3, gRC 5 Mr. R. L. Wright g j j b7b e Advisory Conenittee on Reactor Safeguards e b f$ ~ United States !!uclear Regu3 atory Conanission 0lIEllbOdj$jd N ilJ 71 10 91 Uashington, D.C. 20555 a I
Dear Mr. Uright,
I In response to your request I have reviewed the report pro-pared by Tera Carporation on " Simulation of I:arthquake Ground -{ Motions for San Onofre Nuclear Generating Station, Unit 1." { I . ^ t In my opinion the research described in this report represents y i a major contribution--in fact a break-through--in the scismological field and has the potentici for providing a vastly improved under- [ vtanding of scisnic uave propagation and grour.d motion characteris- [ j[ tics. Ilowever I do not think that the 1.heory has yet been developed to the extent required to provide basic design criteria for nuclear power plants for the following reasons: { i 1. The analyses are neccusarily based on,a simp 1.4. fica geologic f profile which does not take into account either the geologic el discont.inuitien along the travel path of the scismic waves or } the non-31ncor characteristics of the soil layers near the { ground surface. Yncsc effects could considerably modify the { resul ts obtained by the type of analysis used in this study and j' would need to be considered before quantitative design data could he developed. l f 2. I do not think that the 131uutrative examp3cs presented in the j report provide a suf ficient degree of agreement between predicted and recorded motion characteristics to justify any j reliance being placed on the usefulness of motions predicted by thin approach for the San Onofre plant at this time. { - Perhaps r:cmo years down the road the analysis procedure will bc sufficiently improved to permit such a ucc -but I do not think it in good enough at t.his stage. f 9 78120G0086 =
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E ~; u P4 k I do not want the above remarks to detract in any way from the accomplinhments of the Tora work. I consider it a great accomplish-I,, C mont that in spite-of the complexity of the prob 1 cms involved, the f Tera analysis provides results as well as it does. Such results can be used I believe to provido useful guides on the general naturc [' -of scicmic waves at a site but in my opinion, the procedures are not E
- sufficiently refined or verified at this stage to be accepted as a EI
? basis for the design of nucicar power plants. F t Very truly yours, ki e 0 .5% M 5 H. Bolton Scob' 'h [ r, HUS/nh hl r ki t? F: f L. e I E' 4 'r i },r I! rliV t>, p z. I; {' E T ;. I: p ); ~ (,, u! [ 1 g. ,n . _ _.. ~. , _ _. _,}}