ML20210S806

Forwards Request for Addl Info Re Foundation Engineering, Based on Review of June 1975 Amend 19.SER Input Will Be Completed Upon Resolution of Concerns Re Slope Stability Identified in Amend

ML20210S806
Person / Time
Site:	Satsop
Issue date:	08/25/1975
From:	Harold Denton Office of Nuclear Reactor Regulation
To:	Deyoung R Office of Nuclear Reactor Regulation
References
CON-WNP-1684 NUDOCS 8605290415
Download: ML20210S806 (2)

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AUG 2 51975 R. C. DeYoung. Assistant Diret. tor for Light Water Reactors, Group 1, RL tEQtTEST V02 ADDITIONAL INFORMATION - FOUNDATION ENGINurnTNG P! ANT MAME: Waehington Public Power Supply System Nuclear Projects 3/5 LtCENSING STAGE: CP DOCERT IN.t STN 50-508 and $1H 50-509

. MILESTONE NO.: N/A RE5FONSIBLE BRANCH: LWR l-3 RfQUESTED COMPLETION DATEt N/A APPLICARTS RESPONSE DA1T NECESSABT FOR NEXT ACTION PLANNZD ON PROJECT: As soon as possible DESCRIPTION Of EESPONSE: Ansadment to PSAR 5t2 VIEW STXIUS: Walting Information Encloosd are questions regarding foundation engineering for the Satsop site. The questions were prepared by J. Creeves. It should be noted that these questions are based on our review of Amendment 19. dated June 1975. SER input for foundaticit (engineering did not include infor-astion c.outained in A:aendesnt 19. Until we resolve our concerns r,garding slope stability identified in Amendment 19, we cannot complete

$2R input. We vill provide an SER eupplement at a later date.

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r FOUNDATION ENGINEERING QUESTIONS WPPSS NUCLEAR PROJECTS NO. 3 & 5 DOCKET NOS. 50-508, 509 Prepared by:

J. Greeves 323.16.

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Provide cross sections similar to figures 2.5.L.7 thru 2.5.L.10 for.the stability analysis profiles 4 (figure 2.5.79) thru 7 (figure 2.5.82). ' Discuss the lithology, structure, topography, weathering and groundwater conditions for each'of these profiles.

' Explain the basis for your conclusion that the four conditions enumerated in Section 2.5.L.5.1 do not occur in concert for each of these profiles.

323.17 (2.5.5)

As noted in Amendment No. 19, slumping of highly weathered Astoria (termed residual soil) is a mechanism of slope failure t*

of the Astoria Formation at the site. Landslides 2, 5, 7 and 8 occurred in such material. Field evidence indicates these slides occurred on relatively flat slopes. Such evidence leads the staff to conclude. that the shear strength of these residual soils can be less than those properties used in the stability

' analysis (Amendrent No. 4) for proflies 4 thru 7.

Provide an evaluation of the shear strength properties of residual-soil in landslides 2, 5, 7 and 8.

Evaluate the scability of profiles 4 thru 7 using residual soil shear strength properties determined by the shear strength evaluation of the above landslides.

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