01/10/2008 Meeting Handout 'Progress Energy Levy Nuclear ... · LNP Foundation Concept I EL 51...
Transcript of 01/10/2008 Meeting Handout 'Progress Energy Levy Nuclear ... · LNP Foundation Concept I EL 51...
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Progress Energy – NRC MeetingLevy Nuclear Plant
Geotechnical Review
01-10-08
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Meeting Objectives
Introduce Levy site and project timeline
Review foundation conditions at Levy
Review foundation concepts under consideration
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Site Location
Levy County
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Levy County Nuclear Plant
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Levy Nuclear Plant Project Schedule
NRC COL Application July 2008
Limited Work Authorization (LWA) May 2010
NRC COL Issued 1st Quarter 2012
Plant On-line 2016
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Regional Physiographic Map
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Regional Geology
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Boring Layout
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Summary of Field Investigations
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Boring Program (SPT & Coring)51 borings under Safety Related structures65 additional borings for site characterization/Non-Safety Related structuresDepths - 45 feet to 500 feet
Seismic Geophysical Testing (to 500 ft)DownholeSuspension logging
Acoustic Televiewer and Caliper SurveysPerformed in open mud-rotary holes where P-S logging was performed
Geophysical LoggingNatural gamma, gamma-gamma, neutron-neutron, and induction
Pressuremeter TestingLaboratory Testing Program
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North Plant Profile Locations
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North Plant Preliminary North-South Profile
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North Plant Preliminary East-West Profile
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South Plant Profile Locations
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South Plant Preliminary North-South Profile
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South Plant Preliminary East-West Profile
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Summary of Engineering Parameters for Soil and Rock
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Preliminary Mean Soil/Rock Parameters of North Reactor LNP‐2
Layer Type
Mean Unconfined Compressive Strength (psi)
Typical Shear Wave Velocity
(ft/sec)S‐1 Soil ‐ 2,000S‐2 Soil ‐ 2,200S‐3 Soil ‐ 3,000
NAV‐1 Rock 2,573 3,500NAV‐2 Rock 3,200 4,800NAV‐3 Rock 1,046 3,000
Preliminary Mean Soil/Rock Parameters of South Reactor LNP‐1
Layer Type
Mean Unconfined Compressive Strength (psi)
Typical Shear Wave Velocity
(ft/sec)S‐1 Soil ‐ 2,000S‐2 Soil ‐ 2,200S‐3 Soil ‐ 2,800
SAV‐1 Rock 3,978 3,500SAV‐2 Rock 1,046 2,500
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LNP Foundation Concept I
EL 51 PROPOSED PLANT GRADEEL 42 EXISTING GRADE
EL -24 GEOLOGIC UNCONFORMITY
CEMENTITIOUS FILL
fc’ > 500 psiVs > 1000 ft/sec
RCCfc’ = 2,300 psiVs ≥ 3,500 ft/sec
ROLLER COMPACTED CONCRETEBRIDGING MAT
AVON PARK(MIDDLE EOCENE LIMESTONE AND
DOLOSTONE)UCS ≈ 1,000‐4,000 psi; Vs ≈ 3,000‐4,500 ft/sec
REINFORCED DIAPHRAGM WALL (NON-SAFETY)
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ANGLED GROUT HOLES
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LNP Foundation Concept II
EL 51 PROPOSED PLANT GRADEEL 42 EXISTING GRADE
EL -24 GEOLOGIC UNCONFORMITY
CEMENTITIOUS FILL
fc’ 500 psiVs > 1000 ft/sec
RCCfc’= 2,300 psiVs ≥ 3,500 ft/sec
AVON PARK(MIDDLE EOCENE LIMESTONE AND
DOLOSTONE)UCS ≈ 1,000‐4,000 psi; Vs ≈ 3,000‐4,500 ft/sec
ROLLER COMPACTED CONCRETEBRIDGING MAT
CUTOFF WALL (NON-SAFETY)
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ANGLED GROUT HOLES
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Line 1 – AP1000 Basemat
Line 2 – 35-foot thick RCC Bridging Mat
Line 3 – 75-foot thick Grouted Zone
Line 4 – Long-Term Monitoring Program
LNP Foundation Concepts – A “Defense in Depth with Multiple Lines” Approach
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LNP Foundation Concepts
RCC Bridging Mat: ~35-ft thick RCC MatBasic Function
Bridge over postulated solution-induced irregularities in the Avon Park that may develop in the futureProvide a “bedrock” foundation for the AP1000 BasematA Safety Related feature
Basic Propertiesfc’ > 2,300 psiVs > 3,500 fps
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LNP Foundation Concepts
Approximately 75-foot thick Grouted Zone (upper Avon Park)
Basic FunctionsProvide a “bottom for the bathtub”Prevents future solution activity by inhibiting the flow of water through porous zones and fracturesNot a Safety Related feature
Basic PropertiesUCS ≈ 2,500 psiVs ≈ 3,000-4,500 ft/sec
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LNP Foundation Concept
Mid-Eocene Avon Park is the founding mediaBasic Function
Support the overlying RCC Bridging MatLocation of the FIRS
Basic PropertiesUCS ≈ 2,500 psiVs ≈ 3,500 ft/sec
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Planned Excavation Bottom
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Approximate El. -24 feetErosion Surface
Undifferentiated Quaternary Sediments
Avon Park (Eocene)
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LNP Foundation Media
…the Avon Park Formation is cream to light brown or tan, poorly indurated to well-indurated, variably fossiliferous, limestone (grainstone, packstone, and wackstone, with rare mudstone)……the uppermost part of the Avon Park Formation…varies between limestone and dolostone…dolostone predominates deeper within the unit…
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Solution Activity Risk Map
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Solution Activity Potential
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Recharge and Discharge Areas
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Approach – Potential Solution Activity under Grouted Zone (~150 feet below grade)
Assess probability and volume of potential solution activity
Literature ReviewSite-specific data review
Rod drops, drill fluid lossesCore recovery, RQD’s acoustic televiewer and caliper surveys
Using Statistics of data, estimate volume, frequency and depths of potential solution activityShow that Foundation Concepts will “bridge” over potential solution activity without distress to AP1000 Basemat
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LNP Foundation Concepts
Long-term Monitoring Program ConsiderationsRate of Solution ActivityChanges in Porosity / Permeability of the Grouted ZoneChanges in Groundwater QualitySettlement of the RCC Bridging MatSettlement of the AP1000 Basemat
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Other Planned Activities
Test PadsRCC Placement/PropertiesFlowable Fill Placement/Properties
Field TestingGrout Program
AnalysesAssessment of Potential Deep Solution ActivitySoil-Structure Interaction
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Concept I - Plan
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Concept I - Section
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Concept II - Plan
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Concept II - Section
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LNP Foundation Construction Sequence
Stage 1Construct Groundwater Cutoff for the “walls of the bathtub”Conduct Grouting Program to form the “bottom of the bathtub”Install the Shallow wells to “drain the bathtub”Install the Deep wells to relieve the uplift pressure
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Cutoff Wall Construction
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Secant Pile Cutoff Wall Construction
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Cutoff Wall Sequence for Secant Piles
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Grouting Program
Step ADrill & Grout with Low Mobility Grout (LMG)
Depth 75 ft (approximate)Spacing 8 ft (subject to confirmation)Concentric Pattern starting on perimeter and working inward toward centerComputerized monitoring of pressures and takes
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Grouting Program(Cont’d)
Step BDrill & Grout with High Mobility Grout (HMG)Depth 75 ft (approximate)Split spacing with LMG HolesComputerized monitoring of pressures and takes
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LNP Foundation Construction Sequence
Stage 2Excavate the soil in the “bathtub” down to the Avon ParkPrepare the top of the Avon Park
Remove soil pockets and soil-filled fractures & replace with dental concreteClean & remove surface to receive RCC
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LNP Foundation Construction Sequence
Stage 3Construct the RCC Bridging Mat
Stage 4Install the Waterproofing on the RCC Bridging MatConstruct the Upper half of mudmat to protect the membraneConstruct the AP1000 BasematBackfill as Required
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What is RCC?(Stage 3)
RCC = Roller Compacted ConcreteDeveloped in the 1970sPlaced with Earth-Moving EquipmentStrength Same as Conventional Concrete
Same Basic Ingredients (increased fly ash)Extensive Pre-Construction TestingLower Heat of Hydration
Suitable for Site Conditions at LNP
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Example RCC Projects
Saluda Dam (SCE&G) [ASCE OPAL Award, 2006]
Taum Sauk Dam (AmerenUE)Olivenhain Dam (SDCWA)San Vicente Dam Raise (SDCWA)Bear Creek Dam (TVA)Bellefonte NPP (TVA)
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RCC Placement by Truck
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RCC Placement by Conveyor
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RCC Placement by Conveyor
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RCC Placement by Conveyor
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Spreading RCC with Dozer
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Compacting RCC
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Typical RCC Test Pad
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Typical RCC Sample Cutting
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Typical RCC Sample from Test Pad
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Summary Comments
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