ML20215N093
| ML20215N093 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Diablo Canyon |
| Issue date: | 12/29/1976 |
| From: | Stepp J Office of Nuclear Reactor Regulation |
| To: | Allison D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20197J003 | List: |
| References | |
| FOIA-86-371 NUDOCS 8611040266 | |
| Download: ML20215N093 (3) | |
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.,~ - p DEC 2 0 B76 4:C:;0RANDU:I POR:
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/.111000, Project M a r. a ge r. L i e.h t Unter Peactorn Branch dl, DP'i PP.0!!.
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Stepp, C:t i c f, Oeolocy/S+elanology Branch../ C E SUBJECT.
RESP 0riC E - TO ACRS CO ?i S U LT A24T S 4E C0!P!EliD AT ION S P.U G A R D I !? G ThE DIt.bLO CAriV0i;.lu V IEh*
.The ACRS co:as al t an t s raised concerns which can be s umr.:a r iz e d
'as follows:
1.
The free-field elastic response c r e c t r u e: :nay not reflect a n:a gn i t ud e 7.5 at 7 Eiluraeters, but a magnitude 6.S, and should be SU percent liigner in order to reach a magnitude 7.3.
- 2..
T.e d u c t i o ra of the 9poetrim 1 y low pass filtering in the sno uta t ;> c rni t t e d
!.>y our revieu.ls not justified on t ': e Lasis of avallqLin n e l y r_ e ?.
3.
Seven percent daniing t.i a y be toe large for t !a lc site bacause of tii e r o c 's. f oundation u'tich haa S-wave specus'near S,ua") feet per >econd.
4.
Soil.: t ruc t itre interaction uay he a more nppronrinte an.21y s 19 ' e ve a for tain r o c,. 9LLe.
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Perform a sensitivity analysin of tne structure to withstand a 50 percent increase in the frac-field clastic response spectruct and reduction of_the dacaping frons / to 3 percent.
'I 4.
Perforri a three-dimensional soil-structure inter-
'a c' t io n analysis to derive a floor response sp e c t ruin which cnvelopes the condition of vertically incident waves as well as horizontally incident uavea.
3.
.In any event, 'a j us tificat ion of the 7 percent damping is needed.
It appears to r.ic. t h a t we anvc the following options; 1.
Conduct a sensitivity analysis of the responso s p e c t r u pt, which we have accepted, together with a soil-structure $' interaction analvnis) M three-dimetsionaf_m N d.
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= Deter.ine together with a three-diuensional c o il -a t ruc t u re inter-action analysis.
0> tion 1
- It vould appear to be r.. o r e attractive because it
. represents tae Icast departure f rora our curront procedures.
It aac the ucaineas, hovever, of not providing a.a'ee rs t'a n t all can agrou upon.
Thesnreatcat 'i c a k n e s 's is a lack of in-f o r ru t t e n about tae stress conditions of the licci rf fault.
Option 2 - In attractive because it leads to a free field elaatic renconse spectrun that is directly based in a nell defined rationale.
It has tae weakneas. h o*: e v e r, of being a 31pnificant departure f rc ri our current r e v ie tt and acceptance critaria. J % _,-
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