ML021080703

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Attachments: Continued Slides from April 11, 2002 Meeting, and Slides from April 9, 2002 Meeting (S104718-BX)
ML021080703
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 04/11/2002
From: White R
Pacific Gas & Electric Co
To:
Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
+sispmjr200505, -RFPFR
Download: ML021080703 (3)
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NRC/PG&E Open Meeting, San Francisco CA Diablo Canyon Independent Spent Fuel Storage Installation Properties of Subsurface Materials Robert White Geotechnical Engineer PG&E Geosciences Department U April 11, 2002 Purpose m Characterize subsurface materials for ISFSI, CTF and Transport Route for "* Foundation properties

"* Slope stability assessments Subsurface Materials Assessed "* Rock "* Dolomite "* Sandstone

"* Friable rock "* Clay Beds Subsurface Materials Properties

-Rock m Density m Shear Wave Velocities m Young's Moduli and Poisson's Ratios m Shear Strength Rock Properties

-Density

  • Determined from lab tests of rock core samples of dolomite and sandstone
  • 140 pcf +/- 8 pcf for all rock From SAR Section 2.6.4.3.1; Data Report I, Table 1 Rock Properties

-Shear Wave Velocities

"* Obtained from suspension logging of borings at ISFSI site "* Compared with velocities obtained in previous investigations at power block From SAR Section 2.6.5.1.3.2 Figs. 2.6-33, 34, and 35; SAR 2.6.1.10; Data Report C Shear wae veloy (Ips m 1000 a) 2 3 4 5 6 0 a S 0 7 8 9 Explanation Upper- and kower I I bound LTSP shear I wame profile envelope Rbm block baring DDH-D (1977) (Figure 2.6-34) ISFSIborings 96BA-3 (1998) 98MA-1.4 (1996) (Fir 2.6-33)Rock shear wave velocities From SAR Figure 2.6-35 Young's Moduli and Poisson's Ratios m From suspension velocities for rock mass m Compared with lab tests of rock core samples of dolomite and sandstone From SAR Section 2.6.4.3.1; Data Report I Results -Rock Properties m Young's moduli*1.3 x 106 to 1.5 x 106 psi, non-friable rock*0.20 x 106 to 0.21 x 106 psi, friable rock* Poisson's ratios *0.22 to 0.37, non-friable rock *0.23 to 0.31, friable rock From SAR Section 2.6.4.3.1; Data Report I Rock Strength Parameters depend on: "* Type of rock .Dolomite, sandstone

  • Friable rock "* Scale of rock mass analyzed
  • Large scale + Rock slide mass
  • Small scale + Rock wedges Potential large scale slide mass From SAR Figure 2.6-49 Large-scale Slide Mass "* Strength controlled by rock mass + Discontinuities (joints, bedding planes, faults)
  • Size of intact blocks "* Strength of rock mass based on Hoek Brown method From SAR Section 2.6.5.1.2.3 NRC Request for Clarification:
  • "Discuss analysis)the technical to justify the basis (data and rock-mass friction angle ofS50 degrees used to characterize the rock-mass strength of dolomite and sandstone."

Hoek-Brown Input Parameters for Sandstone and Dolomite m Geologic Strength Index (GSI) values as a function of discontinuity condition and spacing m Material index (mi) values as a function of rock type and texture m Unconfined compressive strength (ac) of intact rock samples Distribution of Hoek-Brown Input Parameter Values mean plus mean minus Dolomite one sigma mean one sigma GSI 65 56 46 m. 17 15 13 (Yci 47 32 18 mean plus mean minus Sandstone one sigma mean one sigma GSI 68 65 62 Mi 19 18 17 Ui 31 22 12 From Calculation GEO.DCPP.01.19 Example Hoek Brown strength envelope tangent T= c +On tans 10 20 30 40 Normal stress (f MPa Figure 11.8: Plot of results from simulated full scale triaxial tests on a rock mass defined by a uniaxial compressive strength Oci = 85 MPa, a Hoek -Brown constant m, = 10 and a Geological Strength Index GSI = 45.3020 S10O 0 Rock Mass Strength envelopes (Hoek-Brown) range of interest ri/ll ,11 i 11; 4 i i + i I i i /1.5 1--0.5 0 0.5 7 1//7 1.5 2 2.5 4 3.5--32 1.5 0.5 0 3 3.5 4 4.5 Normal stress (MPa)-0.5 0 0.5 1 1.5 2 2.5 Normal stress (MPa)From SAR Figures 2.6-53 and 2.6-54; Calculation GEO.DCPP.01.19 4.5 4 3.5 1 2.5 21 0 ran-e of inte'est _ Am-3 3.5 4 4.5 4.5 , II l I I I , I -If ý, z i I I I ýrxl 0.5 0.Iý7 Properties of Friable Sandstone and Dolomite m Strength not scale dependent since relatively homogeneous (discontinuities have weathered to consistency of rock fabric) m Samples tested in the lab measured total and effective stresses Friable Rock Total Stress Strength envelope 0 50 100 150 200 250 300 350 400 p=1/2 (7l+G 3) (psi)From SAR Figure 2.6-55N II 0*0 Small-Scale Rock Wedge"* Strength controlled entirely by discontinuities

"* Strength of discontinuities based on Barton Choubey method Potential rock wedges From SAR Figure 2.6-47 Barton-Choubey Input Parameters for Sandstone and Dolomite "* Base friction angle (tb) based on lab tests of shear strength of discontinuities

"* Joint compressive strength (JCS).based on lab tests of unconfined compressive strength "* Joint roughness coefficient (JRC) values based on field measurements of joints in trenches From SAR Section 2.6.5.1.2.3)

Straight line fits: 4- 18, 33, &48' dolomite bedding strength envelopes 14 1.2 I S01 0.6 S04 02 0 02 04 06 0 a1 1 4 Normal stress, is g -MPP Straight line fits: ý=-21, 31, &44' FL sandstone bedding strength envelopes 14 1 2 0Oa 06 S04 02 02 04 06 09 Nor mal sire ns, sign -MPa (shaded zone equals stress range of interest)

From Calculation GEO.DCPP.01.20 stres rang of inter st e- OA@ 5-. S..... .. .,, -- : p-' A 4o,, , ..*12 14 5 1 Clay Bed Properties m Density m Atterberg limits m Over consolidation ratio m Shear strength Density of Clay m From lab tests of clay samples m 120 pcf+5 pcf From SAR Section 2.6.4.3.1; Data Report G, Table G-1 Atterberg Limits m From lab tests of clay samples m Representative values of Plasticity Index (PI) are between 20 to 40 From Data Report G, Table G-1 Overconsolidation Ratio (OCR) m Estimated at several points along three clay beds from knowledge of previous ground surface m Representative values *2to5 From GEO.DCPP.01.31 Clay Strength "* Strength of clay beds from lab tests on samples from tower road cut "* Lab results correlated with published PI and OCR relationships

"* Post peak and/or large strain strengths used NRC request for clarification:

m "Discuss the saturated undrained shear strength of the clay-bed soil."

Unconsolidated Undrained Shear Strength Mohr failure envelope (total stress)V -T =0 (a)I- -<10% ..4.S =100%a (b) Fig. 11.40 Mohr failure envelopes for UU tests: (a) 100% saturated clay; (b) partially saturated clay.From Holtz and Kovacs, 1981 T1 T =C:

..I.. Aof- -a o(total o)L--r ---,

Consolidated Undrained Shear Strength wj -liquid limit + Vane tests wp = plastic limit o Unconfined compression tests From: Lambe and Whitman, 1969 Laboratory Strength Test Data Undrained Direct Shear (Cycled) Cooper Testing Labs, Inc.20000 15000 10000 U an 6n 5000 0-500" -10000 -15000 Deformation. (Inches)

Shear Strengths of Clay Bed (ps) 0 50 100 150 200 ... ... .. ... ... .. 200 25 Effective Shear Strength envelope 150 S20 a 2 10

  • S5 0 5 10 15 20 25 Normal effective stress on failure plane at failure -of (kSO .........................................

... ............

.. ....................

0 t a 50 (ps) 100 150 200 u 200 Ir pe 150 -loo 50 From SAR Figure 2.6-50 and 51; Calculation GEO.DCPP.0 1.31 Summary of Rock Properties m Density: 140 pcf +/- 8 pcf for all rock"* Shear Wave Velocities:

> 4000 fps "* Young's Moduli: related to shear wave velocities m Poisson's ratio: related to shear wave velocities

  • Shear Strength:
  • =- 50 degrees for slide masses to 31 degrees for rock wedges Summary of Clay Bed Properties m Density: 120 pcf + 5 pcf average o Atterberg Limits: PI of 20 to 40 m Over Consolidation Ratio: OCR of 2 to 5 m Shear Strength:.Effective shear strength:= 22 degrees* Undrained shear strength:

.4 15 degrees and c -500 psf, or

  • 29 degrees NRC/PG&E Open Meeting, San Francisco, CA Diablo Canyon Independent Spent Fuel Storage Installation Slope Stability Analysis Joseph Sun Geotechnical Engineer PG&E Geosciences Department April 11, 2002 Presentation of Slope Stability"* Hillslope above ISFSI Pads "* Transport route and CTF "* Cutslopes Joseph Sun Robert White Jeff Bachhuber

Approach m Select cross section for analyses m Develop material properties m Perform slope stability analyses m Perform dynamic response analyses m Estimate potential seismic induced displacements of rock masses on clay beds Approach "* Select cross section for analyses "* Develop material properties

"* Perform slope stability analyses "* Perform dynamic response analyses

  • Address NRC request for clarification on vertical ground motions "* Estimate potential seismic induced displacements of rock masses on clay beds

/ / C' / / /R I II,WIS ON I I Analysis Cross Section I-I1 From SAR Figure 2.6-18 Potential Large-scale Rock Mass Model -Upper Slope 11 North South 800 ----.. .-.-- ....-. ...... .. .. ..... .... ... ... ... ....... MODEL I 700 / 600 . r@ 1971 pre,- tower ax~ess road borrow ,.. excavation tower! 4Aroad SISFSI Pads A-L ""CTF 0 .. .. .. 01 " W OO -A 0 -0 A 01-A From SAR Figure 2.6-47 Potential Large-scale Rock Mass Model -Intermediate Slope II South From SAR Figure 2.6-48 I 800 700 600 500 400 300 200 100 a) C 0 0)

Potential Large-scale Rock Mass Model -Intermediate Slope II Noah South 800_ _ MODEL 2 700 600 --. 1971 pro-borrow excavab~on topography lowe accesms ro 2D 500 ISFS1 I- --14--I . C T F Pads -T-1 4 4-- -___1 1000 .From SAR Figure 2.6-48 Potential Large-scale Rock Mass Model -Lower Slope 1 11 South From SAR Figure 2.6-49 North 800 700 600 500 400 4-. C 0 4 a) iJJ 300 200 100 Static Slope Stability

"* 2-D analysis using Spencer's method of slices "* Input: "* Geometry "* Material properties:

unit weights, strengths

"* Output: "* Static factors of safety (F.S.) "* Yield acceleration (ky)From SAR Section 2.5.1.2 and Calc Package GEO.DCPP.01.24 Slope Stability Theory Resisting moment o Pseudo-static Slope Stability F.S. = ------------

=1 q,- b Driving moment a ý4 w Fig. 2. Conventional method for computing effect of earthquake on stability of a slope (after Terzaghi, 1950)S I Assumptions m Claybeds are saturated m Tension cracks exist in the upper 20 ft m Rock to rock contacts along the thin clay beds are neglected m Lateral margins of potential slide masses are assumed to have no strength From SAR Section 2.6.5.1.2.2 UTEXAS3 -Slope Stability m Uses a 2-stage stability computation to evaluate the stability of slopes under seismic loading conditions (Duncan, Wright, and Wong, 1990) 1Ist stage: computes the state of stress along the shear surface under long term loading conditions

  • 2nd stage: calculates undrained shear strength based on long term state of stress and performs slope stability analysis under seismic loading conditions Cross Section I-I" (shallow model)I From SAR Figure 2.6-47 0 -e 0m~ I©Q N) 00 Cross Section I-I" (deep model)From SAR Figure 2.6-49.1, t Results of Static Slope Stability Slide Mass Static F.S. Yield Acc. (ky) la 2.55 0.28 (Ib 1.62 0.20 *2a 2.55 0.31 2b 2.16 0.24 2 c 2.18 0.19 4 3a 2.86 0.44 3b 2.70 0.39 3 c 2.26 0.25 4 3c-1 2.38 0.28 3c-2 2.28 v 0.23 From SAR Table 2.6-3 Methodology of Seismic Analysis m Yield accelerations (ky) determined from slope stability analysis m Response of slide masses under seismic loading evaluated using 2-D finite element method m Displacements of slide masses calculated using Newmark sliding block approach QUAD4M -2D Dynamic Response Analysis m Input: "* Unit weights "* Shear wave velocities and damping values "* Non-linear material properties 0 Output:
  • Acceleration time histories of slide masses

-1.00 .I I I I I I I I I , z I I IIT Illustration of 0.8Bock3C

-0.8 -Block 3C Ilsrto of-0.6 -Ground Motion Set 1 -04Ky= 0.25 g o0.-0.2 S0.00 Newmark 4 "5 0.2 -p S 0.6 Sliding Block 0.8o 1.00 .... ... 0 5 10 15 20 25 30 Displacement Time(seconds)

Calculation 1.0 4Q 100 / o 50 a) 0 0 5 10 15 20 25 30 Time (seconds) 60 50/- Displacement=

48.9 cm S40 a) E 30 k~ta) -g 20 Q. 6 10 ;1 0 w 0 5 _ 10 15 20 25 30 Time (seconds)

NRC Request for Clarification

... the slope safety SAR, evaluation presented in the ground motion components without the vertical component, should be clarified

...1" which was developed using the horizontal Effects of Vertical Ground Motions on Sliding Analysis "* Inclination of slide planes (bedding planes) "* Vertical motions more important for steeply dipping slide planes (greater than 30-40') "* ISFSI clay beds typically dip less than 15' "* Steepness of slope "* Vertical motions more important for steeper slopes "* ISFSI hillslope is about 3:1 (H:V) and the effect of steepness of slope is incorporated in the 2-D slope stability and dynamic response analyses Effects of Vertical Ground Motions on Sliding Analysis m Material strength properties

"* More important for sandy material "* Less important for clayey material "* ISFSI slide plane material is clay beds Ground Motion Considerations for Sliding Block Analysis "* Direction of slide mass movements:

"* Occurs along claybeds "* Claybeds are horizontal to sub-horizontal

"* Postulated slide mass movements are influenced by horizontal motions "* Slide plane inclination:

"* Limited effect on computed displacement (less than 10%) if the inclination is less than 20' based on Makdisi (1976) for sandy materials

"* For material similar to the ISFSI claybeds, the influence would be less "* ISFSI claybeds typically dip less than 15' Ground Motion Considerations for Sliding Block Analysis (cont'd) "* Undrained shear strength of claybeds:

"* Controlled by long term overburden pressure " Relatively insensitive to seismic loadings "* Peak arrival time: " Arrival time of horizontal peak is typically 1 to 3 seconds behind arrival of vertical peak based on near field recordings

"* During strong horizontal shaking, the energy (as measured by Aries Intensity) on the vertical component is typically 10% to 30% of the energy on the horizontal component Ground Motion Considerations for Sliding Block Analysis (cont'd) "* Standard of practice for seismic design of dams:

  • Evaluation of permanent displacement of embankment dams under seismic loading is based on horizontal component of the design motion (USBR, 1989) "* Recent studies: *Study at Cal Tech indicated that vertical ground motions have limited impact on block movements based on numerical analysis and physical modeling Yan, et al. (1996)

Preliminary Site-Specific Study m Evaluate effect of vertical motions on computed yield acceleration m Evaluate effect of vertical motions on slide mass responses m Incorporating vertical ground motions resulted in displacements varying less than 10% from calculations based on horizontal component alone Effects of Vertical Seismic Coefficient (kv) on Yield Acc (ky)-kv up f v+kv down kv -0.8 -0.6 -0.4 -0.2 +0.0 +0.2 +0.4 +0.6 +0.8 kh ky 0.23 0.22 0.20 0.19 0.19 0.18 0.17 0.17 0.16 Zone of applicability Based on hand calculation of slide mass lB Response of Block 1B Response Direction EQ 0.0uInpu 0.5 0 10 20 30 40 5 C 0. .0 2 0.0 "o -0.5 < -1.0 , (,I Average horizontal acceleration in wedg e 1 B using H+Vinput 0 10 20 30 40 50 1.0 0.5 0 0.0 4I 0 -0.5 < 10ie A r-a--q- -on_ acceleragion in Wt adge 1B ul ing directiodg of claybed (14 deg.) -1.0 " I 50 Vertical Ground Motion Effects on Computed Displacements 100.00 10.00 .00 CL (U( 0.10 0.01 0.0 0.2 0.4 ky 1.0 0.6 0.8 Conclusions on the Effects of Vertical Ground Motions "* Effect on clay bed shear strength

  • Minimal to none "* Effect of inclination of potential slide plane
  • Minimal "* Effect on computed horizontal response of slide masses
  • Minimal "* Overall effect on computed displacements
  • +10%

Potential Seismic Induced Displacements on Clay Beds :999 -node points to compute acceleration time histories 800i I 700 600.. 3.1lft 0)500 400 cc S1.2 ft 1.4f 100 200 300 400 500 600 700 800 900 Horizontal Distance, feet Mitigation Measures for Slide Masses m Set back*25 ft wide bench between cutslopes.40 ft clearance between edge of ISFSI pads and toe of cutslope m Debris fences Conclusions

  • The stability of the hillslope above the ISFSI pads was analyzed and the slopes have ample factors of safety under static conditions.

m The hillslope above the ISFSI site may experience small displacements when exposed to the design-basis earthquakes.

Conclusions (cont'd) m The maximum seismic induced displacements could potentially be about 3 feet on the upper slope to about 1 to 2 feet on the lower slope. m Mitigation measures will be implemented to minimize effects of the small displacements and protect the ISFSI facilities to perform their intended design functions.

NRC/PG&E Open Meeting, San Francisco CA Diablo Canyon Independent Spent Fuel Storage Installation Transport Route Stability and Displacement Analyses Robert White Geotechnical Engineer PG&E Geosciences Department April 11, 2002 Transport Route Slope Stability and Displacement Analyses Steps 1. Locate critical slide mass with minimum factor of safety. Determine yield acceleration for critical slide mass. 2. Determine seismic coefficient time history for critical slide mass. 3. Determine potential earthquake-induced displacement of critical slide mass.From SAR 2.6.5.4.2; GEO.DCPP.01.28, 29, AND 30 Stability and Yield Acceleration Analysis of Critical Slide Masses m Three representative sections along the transport route were selected m Affect of transporter load also evaluated Analytical Sections Cr, ©0 Finite Element Sections"* Finite element meshes for Sections L-L' and E-E' were prepared.

"* A finite element mesh for Section D-D' was not prepared, as it is similar in configuration to Section E-E'.

Seismic Coefficient Time Histories of Slide Masses m Finite element meshes for Sections L-L' and E-E' were prepared.

m A finite element mesh for Section D-D' was not prepared, as it is similar in configuration to Section E-E'.

Seismic Response Analyses Slide Masses I % II' I I I I I I I I I I I I Section L-L'Vs= 1200 fps, unit weight 115 pd,-400 -300 -200 -100 6 160 260 360 460 560 660 760 860 960 1000 Horizontal Distance, feet [From Figure 1, GEO.DCPP.01.29]

70uuI 600 50O 400-300 200 100-Cu 0I 100-200--500 Seismic Coefficient Time Histories of Critical Slide Masses m ILP ground motions were rotated to the direction of Sections L-L' and E-E' and input into the finite element program.

m The seismic coefficient time histories for the critical slide masses were obtained by averaging multiple nodal point time histories within the respective masses.

Earthquake-Induced Displacements of Critical Slide Masses m The Newmark sliding block analysis procedure was used to estimate the potential displacements of the critical slide masses using the seismic coefficient time histories to estimate the potential slide mass movements.

m Potential displacements of the critical slide masses

  • in the three sections analyzed range from 0.5 to 1.3 feet.

Transport Route Displacement Analyses 100.00 10.00 01.3 S1.00 0.10 0.01 1.0 From Figure 6, GEO.DCPP.01.30 0.2 o.-).46k o." 0.8 0.0 Conclusions m Three representative sections along the transport route were evaluated for static and seismic loading conditions m The sections are stable under transporter loads m Displacements of 1.3 feet or less were calculated for slide masses subjected to the ILP ground motion NRC/PG&E Open Meeting, Diablo Canyon Independent Spent San Francisco, CA Fuel Storage Installation Stability Analysis of Cutslopes Jeff Bachhuber Engineering Geologist William Lettis & Associates April 11, 2002 Purposes m Evaluate static and dynamic stability of proposed ISFSI pad cutslopes against possible smaller-scale rock block (wedge) failures m Develop conceptual cutslope rock anchor support

, ftw s S. S* PS~v V.W,-,

............---

.........L E1,149,000 Limitof7To PograPhic S. ....." ---27 k ý57. A.. ""-'E Backcut -" . n profile.

// / / 4. I , T-, 6G (SAR Figure2.6-3.2)

/'-' .1 4 50 100 150 200 -L_-_i --_L- -I -J 5-so's/i I North MODEL 2 ISFSI CTF Pads Reservoir 1971 pre-borrow excavation topography II South 800 700 600 S500 4 0 400 a, 300 200 100 tower access 1'Tofb Doinltori BACK CUTSLOPE 7' restricted area fence 25' wdde bench a el.329.75' S' security fence ISFSI PAD raw water wrm ervc Cask setback from toe of cut (SAR, PG&E, 2001)0 50 too 150 200 250 400 350 250 200 300 350 K -'A / / / / /S -.T-16' ' ' '/ "T 1 B ". ,/ ,/ " DS- ",1T- -"b (in road cut),-/ / ," /

1/4 +/-100ft. 0 100lFeet 1/8 to1/4 +/- 50 ft. < 1/8 +/- 25 ft. V=H 1971 pre-borrow topography CTF ISFSL. ..-T -1.1-F.D-TCTF 01-H Change in dip " . direction- -700 600 500 '--'400 a1) UI-, 0 16 300 a) w 200 100..... ..Tofb-i .... Dolmilte v (From SAR, Figure 2.6-18)II South N--.-r 'F -0 zoo U -U-I Clay Beds 11 North South > 1/4 ++/-100 ft. 700 100 Feet 1/8to1/4 -,+/--501ft. Scale < 1/8 +/-+25 ft. V-H 600 Temporary perched water 500 on clay beds after storms 0.A S400 C FIS F S ... 01-F.. _ ' _! "._: ._- -' ... ., .. ,.. CTFT-1D .Reservoir Road , T1- 11 .0 01-CTF-A / 01-A __ S 300 200t Totb-2 Sandetone 100 0 Main water table (From SAR, Figure 2.6-18)-A Large-scale Mass Movements m Geologic interpretations of extent of clay beds is conservative, but not extreme m Potential slide planes are chosen to follow the full extent of more extensive clay beds and step between clay beds, this assumes minimum rupture of rock m Rock to rock contact along potential slide plane along clay beds not factored into model, this would increase the clay strength from that used Clay Beds Not Continuous Clay Beds North South > 1/4 +/-100ft. 700 0 100Feet 1/8 to1/4 +/-50 ft. Scale <1/8 +25 ft. V-H 600 500 1971 pre-borrow topography 00 -",A T8400 T .----- "F 0 01-CTF-A 01-A- =01 --II Tadb--- _D o lom ite * .. Tofb-2 -01 San dotonb----- ---100 .0 9-(From SAR, Figure 2.6-18)-T-1 Clay Bed Extent Based on Thickness 0 100 Feet 1/8 LU tol/ +/- +/-u .t. Scale[ <1/8 ++/-25 ft. V=H 1971 pre-borrow topography IS FS1l. "01-F 01-H I_..- " I SHSI al-F 700 600 500 "--400 a) 0 N 300 a) w 200 100 R2 --'" -q, -.- --- OOBA T-14A a-01 Tofb-1 ---.. .. Dolomite I-v (From SAR, Figure 2.6-18)I North Clay Beds >1/4 ---+/-1001ft. 1 /0 f-1. ]A -trf% £f II South Tofb-: Sandstor 0 K Thin areas where rock contact occurs across clay bed Thick areas of clay bed Potential slide plane smoothes Shears offset clay bed undulations of clay bed by breaking through rock Potential Slide Plane Breaks through Rock along Clay Bed Evidence of No Landslides at ISFSI m No evidence on pre-1971 air photos m No evidence in studies for and excavation of borrow site m No evidence of any fissures or fissure fills in trenches for ISFSI Assumed Displacement of Large Scale Slide Mass* Fractures in the slope larger than 3 to 4 would have left a record on the slope

  • No vegetation lineaments (similar to of intense growth in filled trenches)inches the zones* No open fractures or soil-filled fractures in trenches on slope "* Hillslope is 430,000 years old "* Subjected to many large earthquakes
  • Assumed 4 inches would occur in one slide event Ab1 ~5'K/ CD -~ -CL / -/~LL It~~I al Ka LL .V, //N-' a -0 N co Slope 430,000 years ago wo 900 --1971 slope Q4 70- Q 5 Marine wave-cut platform older than 430,000 Marine wave-cut platform years (430,000 years old) Hill Slope is 430,000 Years Old, but degraded a Few Tens of Feet North Clay beds at base of South 700 0100 Feet modeled large-scale V=H movements extrapolated 600 to pre-1971 slope 500 1971 pre-borrow topography S400 I~~~SFS1 400 CTF ..-T-1 1 D -- .--, ----- .. ---"" Reservoir Road F H C ad 1 t- "OOBA-3 0 01-CTF-A, 01-A -S300 Lii 200 Totb-It, -. Sandston-

' 100 0 (From SAR, Figure 2.6-18) Results of Sensitivity Study Clay Bed Strengths 200 --a-pMedianJdDeep Model stress range N, Model -800 psf/215 deg U) tres -3000 psf / 22 deg 150 Shallow-800 psf / 36 deg co Model stress range psf/4deg " 1O0-range.2500 psf /23 deg j:100 U _--800 psf / 26 deg -0 psf /37 deg c 50 Strength ) 5used study 0 0 50 100 150 200 250 Normal Stress (psi) Confidence in Predicted Foundation Conditions at CTF, ISFSI Pads and Cutslopes m High confidence in rock types predicted

  • Sandstone
  • Dolomite
  • Friable Sandstone " Friable Dolomite " Clay beds Interpretations with Less Certainty m Locations and percentage of rock types not known with certainty m Friable diabase may be encountered and is expected to have the same properties as friable sandstone m Attitude of clay beds uncertain, more clay beds may be exposed m Precise location of faults uncertain, other shear zones are expected Conclusion m High degree of confidence that there will be no significant surprises m Features will be mapped during construction m Planned mitigation measures will be applied as appropriate WV April 9, 2002 Diablo Canyon ISFSI Site Tour 1 March, 2002 I 1a c , 2 0 ,4 4 , " , I, , -; f -3 Diablo Canyon Dry Cask Tour Agenda April 9., 2002 8:00- 8:25 8:30-8:35 8:35- 9:30 9:30 -9:40 9:40 -10:40 Maintenance Shop Building Training, Badging, Dosimetry Canyon Room (Breakfast provided)

Intro by Jearl Strickland, USFP Manager Canyon Room Part 50 and Part 72 Presentations Break Canyon Room Geotechnical Presentation 2 March, 2002 Diablo Canyon Dry Cask Tour Agenda April 9, 2002 10:45 -12:15 12:15- 1:00 1:05 -4:00 4:00 -5:00 Board bus in front of Training Building Geosciences Tour Training Building, Room 123 Lunch Board bus in front of Training Building Field/ISFSI Site Inspection (Outside Protected Area)Training Building, Room 123 Closure Activities, Q&A 3 March, 2002 Process for Loading Used Fuel into Dry Storage 4 March, 2002 Transfer Cask Placement in Fuel Handling Bldg V F-`IL 5 March, 2002i NO Transfer Cask Upending in Fuel Handling Bldg 6 March, 2002 Cask Transport Frame Stabilizer 1IMI Tension Links 7 March, 2002 FUEL HANDLING BUILDING CRANE AUXILIARY LIFT FHB CUANE MAIN HOIST TOP BLOCK PIN 121 JOYCE SCREW JACK PI L : "I ' PIN. J--7 8 March, 2002 I A*~I Transfer Cask Removal From the Cask Transport Frame N- I ',l ý[",,L IN K March, 2002 9 w -Wwý Transfer Cask Placement in the Cask Washdown Area L I U! I I-- FP E T -7 .Note: Main hook not shown, but is engaged Note: Seismic Restraint is not current version in this slide 10 March, 2002 Attachment of Impact Limiter 11 March, 2002 WALL P Cask (6PAE\ \Washdown L"'"Area Seismic Restraint 5LiNSS F-P l'AR T' CONTROLLEO LOW -Ri liON MATERIAL Impact Limiter -12 March, 2002 MPC and Annulus Filling Note: Seismic restraint is not current version in this slide 13 March, 2002 Transfer Cask Removal from Frame Note: Main hook is engaged, but not shown Note: Seismic Restrain is not current version in this slide 14 March, 2002 TRANSFER CASK READY FOR HORIZONTAL MOVEMENT TO SFP 15 March, 2002

  • SPENT FUEL POOL STRUCTURAL FRAME DETAIL DETAIL (TYP. 4 CORNERS)16 March, 2002 Transfer Cask Placement in Pool after Engaging in SFP Frame 17 March, 2002 Spent Fuel Loading into MPC 18 March, 2002 MPC Lid Installation SNPC LID ,,RES TRAINT Notes: Main hook is engaged, but not shown Final lid restrain will differ 19 March, 2002 MPC Lid Installation Note: Main hook is engaged, but not shown March, 2002 20 March, 2002 UIFT TRANSFER CASK READY FOR HORIZONTAL MOVEMENT TO CWA 11a" 21 Placement of Transfer Cask in Cask Wash Down Area Note: Main hook is engaged, but not shown Note: Seismic Restraint is not current version in this slide 22 March, 2002 MPC Lid Welding 23 March. 2002--w- I EL, %ml -1 MPC Lift Cleat Installation L 1 r- T :I L E ',- -24 March, 2002 Transfer Cask Readied for Horizontal movement Note: Main hook is engaged, but not shown Note: Seismic Restrain is not current version in this slide 25 March, 2002 Transfer Cask Removal from Frame Note: Main hook is engaged, but not shown Note: Seismic Restraint is not current version in this slide 26 March, 2002 Transfer Cask Placed on Transport Frame Note: Main hook is engaged, but not shown correctly 27 March, 2002 Transfer Cask Downending Using Impact Limiter 28 March, 2002 I 28 March, 2002 lktl&l; Transfer Cask movement to Transporter 29 March, 2002 Transporter Rigging LIFT INL] :R'ACiKE T S, H 0lIP I ZFP N March,12002 30#

T c1r) Hi-Storm Overpack Lowered into Cask Transfer Facility 32 March, 2002 I Hi-Storm Overpack with Mating Device "NET -HD R'vL:\T 33 March, 2002 Transfer Cask Upended (Transporter not Shown) F]:L L ,'-- P ;Ir.! F' K F ] ' T , : 34 March, 200271 Transfer Cask movement to CTF 35 March, 2002 Placement of Transfer Cask over Storage Cask MarcLhU L2F March, 2002 36 AT C TF WIO TRA NSPOR TER SHOWN LIFTIN tPL ATT jts J,-!, t÷ T t- t -r -u rJ Icit e c04 r-e st r-oa in t ý , c,t. 4r, 37 March, 2002 Transfer of MPC into Storage Cask March, 2002 38 Transfer Cask Removal from CTF C ASK T " ,r1,FER FACILITY , NEIT SHOWN)39 March, 2002 Storage Cask Lid Placement 40 March, 2002 Overpack Raised out of CTF K- ; ,, 41 March, 2002 I Overpack Transported to Storage Facility 42 March, 2002 Overpack Placement on Storage Pad 43 March, 2002 I J Overpack Loading Operations Activity Part 50 Part 72 1. Move empty cask and MPC into Impact on N/A FHB and prepare for loading structure

2. Empty transfer cask and MPC being Heavy load N/A placed in SFP drop 3. Load fuel assemblies into MPC Spent fuel Fuel TSs movement in pool 4. Remove transfer cask from SFP Heavy load Thermal drop on req's structure
5. Decontamination Existing N/A processes
6. Welding, leak testing and prepare for Releases and Fuel movement SSIP conditions/

closure req's 7. Transfer cask movement in FHB Heavy load N/A drop on structure

8. Transfer cask movement outside Effect on Transporter FHB plant SSCs stability 44 Part 50 and 72 Scope
  • Part 50 -Crane modifications

-Heavy load drop structural analyses -Cask seismic restraints -Affect on facility during transport

  • Part 72(Holtec CoC 1014) -Cask structural limits (drops, missiles, etc) -Criticality analysis during cask handling -Thermal analysis during cask handling 45 March, 2002
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