ML20198G134
| ML20198G134 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 02/24/1976 |
| From: | Gammill W Office of Nuclear Reactor Regulation |
| To: | Deyoung R Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1108 NUDOCS 8605290250 | |
| Download: ML20198G134 (2) | |
Text
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! 8 Richard C. DeYoung Assistant Director for Light Vater Reactors, DFM -
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PIELD COMPACTION AND CONTROL - POUNDATION ENGINEERING i j P1 ANT NAME: WPPSS Nuclear Project No.1 LICENSING STAGE: Post CP '
l DOCIET NUMBER: 50-460 ;
MILESTONE NUMBER:'-N/A' RESPONSIBLE BRANCH: LWR 1; I. Cox, LPM REQUESTED COMPLETION DATE: N/A APPLICANTS RESPONSE DATE NECESSARY POR NEXT ACTION PLANNED ON PROJECT: N/A j REVIEW STATUS: Continuing - Geology and Seismology Br., Foundation Eng. Sec.
We have reviewed the document entitled, " Report on Variance 2 to the PSAR Soil Density Testing Countituents," February 3,1976, by United Engineers si Constructors. Incorporated for Washington Pubite Power
- Supply System. _
During the initial phase of field backfill, lower values than those '
reported in the PSA2 were obtained for maximum densities of structural ,
fill. It was discovered that the cause of the lower densities was the "
inability of electromagnetic vibratory tables to comply with the ampli-tude requirements of ASTM D2049. As a result, a comparison study was undertakan to establish the correct apparatus and amplitudes to be used for maximssa density determination.
The report concludes that the follwing requironients should be made part of the PSAR and contract specifications:
a) The requirement that the vibrator be a nachanical type table ,
rather than an electromagnetic type, as now speeffied.
- b) The requirement that the amplitude be measured with the 0.1 cu. ft.
mold, soil and surcharge weight and not with a 250 pound load, as i now specified.
c) The requirement that tests be periodically run to determine the amplitude that produces the maximun density for the type of soil and that this amplitude be used for the required density tests.
8605290250 760224 ADOCK 05000460 POR A PDR
a O
FEB 3 41375 Ricpard C. DeYoung 1 it is our opinion t'. hat the situation has been analyzed thoroughly
- and satisfactorily and thdt the proposed requirements for modifi- '
r cation of the testing progree and 3ppaiatus are acceptable.
! However, in order to compiege our reviav, we ask that we bs provided with the following informatiott as soon as possible:
a) A definite ar.heCule and freguancy for the ccaduct of variable i acplitude tests, ad defined in tsquirennt c.
b) A compIsta,dascription of the proced6ros used ih the reported re-testing program (i.e. excavation to varicus levels, obtaining s u ples, etc.).
c) The results of the planusd ratests in the Spray Fond area.
Original Signed by
) G. Hulman
\
, William P. Caseill issistant Director j V for Site Technology Division of Site Safety and Envircnnental Analysje cc: H. Denton J. Stepp L. Heller T. Cor.
J. Stoly R. Shamr.aker D. cilien DIST:
Mdb.TN0.50-460 NRR Reading GSB Reading
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DGILLEN/rw Stepp . 45 -- . . . _ . _ _ _ . _ . .,
..,. 2/23/76 2/p/76 ,2/fp,76, _ _ _
Torse AEC-313 (Rev. 913) AEOt 024J W u. s. oovemmars=T *esserine er,scss s ete.cas.ies