ML20210T097

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Summary of 741220 Meeting W/Util,Ebasco & Woodward-Clyde in Bethesda,Md to Discuss Landslides & Slope Stability.List of Attendees Encl
ML20210T097
Person / Time
Site: Satsop
Issue date: 01/21/1975
From: Oreilly P
Office of Nuclear Reactor Regulation
To:
US ATOMIC ENERGY COMMISSION (AEC)
References
CON-WNP-1738 NUDOCS 8605290714
Download: ML20210T097 (5)
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'WPPSS NUCLEAR PROJECTS No. 3 AND NO. 5

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ll' StattutY OF DECEMBER 20, 1974 MiETING W11H WPPSS TO DISCUSS IANDSLIDES i

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On December 20,~1974, representatives of WPPSS, Ebasco, and Woodward-Clyde (formerly Woodward-Lundgren) met with the Regulatory staff in Bethesda, Maryland. This meeting was requested by WPPSS to discuss j

their studies on landslides and. slope stability in the region near l

the proposed site of WPPSS Nuclear Projects No. 3 and No. 5.

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. Woodward-Clyde, the applicant's geologic consultant, described a Vi.

reconnaissance study of landslides in the site area. This study was

<,e - still in progress on landslide area No. 8 (designation in Section

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2.5 of the PSAR).

Woodward-Clyde described landslide area No. I as a fluid mass type of landslide.

It is located approximately 9000 feet from the plant l

site with a large portion of its lower surface resting on siltstone.

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'. His landslide was described as having failed on a mappable unit of l

siltstone in the Astoria formation. The techniques for mapping i.

landslide area No. I were described.' The results of the investigation i

of' landslide area No. 1 indicate that this slide is at least several i

etheusand years old.

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.In' their description of landslide areal No. 3, Woodward-Clyde

./ ' characterized this slide as one that is not a flow slide. Landslide area No. 3 is' situated on the same siltstone as landslide area No.

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,';1.: The age of slide area No. 3 is approxisately the same as the age t > ' of area No.11. The originating mechanism for this landslide was 1.

described-as being the same as that for, area No.1 (failure of a thick unit of siltstone).

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{BothlandslideareasNo.4andyou 6 p e_ described by_ Woodward-l

- Clyde as fluid mass slides. - Landslide area No. 4 was characterlie,.d y as a complex ares'- it is actually composed of a number of slides.

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- Landslide aren No.:4 is situated on a siltstone unit that is a different 9

' s t h, usit from the siltatene in landslide areas E 1; and No. 3. ' ~

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. Qdy NeedwarMIyde summarized theistudies N d in la9dslide areas 'M" %..<4

. M M Ms. 1,' E ;3, No.,4, and No. ;6. JThey sophasized that all four

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'ylandslides failed en prominent.:mappeble istits of siltstone in the

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i k(Astoria formation. ;The. two mappable siltstone beds associated with 1."

these four slides were the only two such silistone beds.found in the

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ih-j"f. region near the' site. ' Woodward-Clyde stated that siltstone had an

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impprtant role in the' formation' of these landslides in the site region.

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They have identified the following isCfactors in landslide formation:

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failure on dip slopes, failure on weak units (e.g., siltstone),

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, weathering (in some cases, deep weathering), undercutting, and ground-

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% oodward-Clyde described landslide area No. 2 (located 9000 feet ni W

T southwest' of the plants) as n' rigid slide.

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~-Mof tho' slide plane itself in _this landslide.

d Alf observable evidence

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~Jindicates the same mechanisms of slide formation as were discussed t

l in the' cases of landslide area Nos.1, 3, 4 and 6.

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Landslide areas No. 5 and No. 7 were described by Woodward-Clyde

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7 as small, earth flow type slides om dip slopes ~ in steep gulleys.

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. Landslide area No. 8 is located 450 feet south of the plants. Woodward-

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Clyde stated that this slide area is!, older (because of the-lack of

' Scb geomorphic evidence) than other slides. in the site region. Red clay

?JV was observed in core boring D-10, which was recovered from the base l

at the slide area. The slippage surfaceuis associated with the red j;

g f clay. : 1hus.the slippage surface was 'readily traceable. No s.uch clay ~,. 33. c.jp.

was found in the core borings obtained from the plant -site itself.

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g l.From their investigation of these landslides, Woodward-Clyde concluded y

1 (that the geologic conditiams-observed in the landslide areas near the

. site differ from. those observed at the site (i.e., absence of deep e.

i i. ' weathering, steeply dipping slopes, and undercut bedding). As a result,

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they claim that the conditions for potential landslides do not exist j

in the plant area itself.

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2$ Woodward-Clyde stated that they ar,e not studying the potential for c

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M s' landslide to occur offsite and then move ~into the plant area.

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EgNPPSS Lagreed to doah he results of the study offlandslides by Q ~ O.

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ENCLOSURE A'ITENDANCE LIST MEETING WITH t

WPPSS DECEMBER 20, 1974 WASHINGTON PUBLIC POWER SUPPLY SYSTEM D. B. hhitford G. C. Sorensen EBASCO A. Wern WOODWARD-CLYDE A. Patwardhan M. Perkins NUCLEAR REGULATORY COMMISSION P. O'Reilly D. R. Budge J. T. Greeves 6

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Docket F11er' S. Varga AEC PDR R. W. Klecker Incal PDR F. Schroeder

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DfR 1-3 Peading R. Tedesco 1,WR 1-3 File V. Stello L Reading (M. Groff)

R. Maccary R. C. DeYoung H. Denton V. A. More V. Benaroya D. Skovbolt C. Iong D. N 11er G. Lainas R. Denise D. Ross K. Go11tr T. Ippolito W. Butler J. Knight J. Stolz S. Pawlicki R. Clark L. Shao R. Ireland B. Grimes D. Vassallo W. Gamill K. Kniel R. Ballard O. D. Parr P. Fine A. Schwencer T. Novak R. Purple M. Spangler D. Zimann S. Kastner P. Collins EP Project Manager - J. Norris G. Knighton Project Manager -

P. O'Reilly G. Dicker Attorney, OGC B. Youngblood RO (3)

W. Regan, Jr.

V. H. Wilson R. Vollmer ACRS (12)

W. Houston F. Kantor

.G. Lear T. Johnson C. Stepp D. Budge T. Mirphy R. Karnasiewicz C.. Liang P. Stoddart J. Costello F. Cherney P. Chen E. Brooks R. Satterfield F. Ashe M. Bolotsky I. Sihweil V. Goel J. Greeves G. Mainz L. Phillips R. Qilp

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January 21,1975 Docket

. 50-509

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~.g RESPONSE TO STMDARD REVIEW ASSIGMENT, EPPSS NUCLEAR PROJECT I"

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,;_NDS.J3 & 5. REVIEW 0F PSAR CHAPTERS 13.3 AND 13.7

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- Applicant: Washington Public Power Supply System J

-Licensing Stage: CP:.

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Branch & LPH Requesting Assistance: LWR 1-3..P. D. O'Reilly l

Review Branch Involved: L:IS&EP Requested Completion Date:

1/24/75

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Review Status: Q2 continuing The attached report contains information requests relative to our review of.the subject SAR for transmittal to the applicant in 4

accordance with the review schedule. _

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_ ~ A complete response to our question 421.2 on industrial security s

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and question 422.1 on emergency planning has not been received.

Therefore, our information requests and/or position statements, if any, relative to our review of these subjects, will be delayed i

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j 420.0 INDUSTRIAL SEC'URITY AND EMERGENCY PLANNING BRANCH 422.3 Your reply to question 422.2(4) was not responsive to our (13.3) concern that your preliminary emergency planning efforts are adequate to meet the requirements of 10 CFR 50, Appendix E, paragraph II.E.

Identify at least two of the hospitals with whom you have made preliminary cont'act and_ provide evidence that such contact has established a willingness and potential capability to receive and treat individuals affected by radiological emergencies.

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