ML070720250

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12/12-13/2006 Slides, Txu Power Comanche Peak Site, NRC Onsite Review, Site Geotechnical Investigation Activities
ML070720250
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 12/12/2006
From:
TXU Power
To:
Office of Nuclear Reactor Regulation
References
Download: ML070720250 (25)
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Text

4 TXU Power Comanche Peak Site NRC Onsite Review Site Geotechnical Investigation Activities 12-13 December 2006

Agenda and Introduction

  • Project Introduction

Introductions

Project Background and Status

  • Project Organization and QA
  • Site Investigations Overview
  • Site Orientation Site safety briefing Logistics Site tour

Comanche Peak Site Background

" Multiple reactor technologies considered

  • Plant placement designs were developed that enveloped potential reactor technologies Multiple placements on the Comanche Peak site were considered before current placement selected
  • Geotechnical investigation commenced on borings common to all potential reactor technologies (Phase 1)
  • Geotechnical investigations will finalize site characterization after the reactor technology is selected (Phase 2)
  • Hydrogeological investigation - including well development performed to investigate groundwater conditions

Project Organization Site Geotechnical Investigations TXU Power Enercon Services COLA Development WLA Fugro Seismic, Geologic &

Site Geotechnical Geotechnical Characterization Investigations T

Support Subcontractors Support Subcontractors

Project Organization Responsibilities Site Geotechnical Investigations

  • TXU Power

- Site owner

  • Enercon Services, Inc.

- COLA contractor for TXU Power

- Providing QA oversight for geotechnical investigation activities as well as managing interface with site owner

  • Enercon Subcontractors William Lettis & Associates, Inc. (WLA) - Provides Overall Technical Direction for Geological, Geotechnical and Seismological Studies Fugro - Implementation of Site Characterization Activities; i.e.,

Drilling, Well Installation, Laboratory Testing, Geotechnical Engineering Services

Site Investigation/Data Collection Quality Assurance I

TXU Power I

IEnercon QA Program I

Contracted to perform work under LEnercon QA program

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I, I Enercon QA Project Plan Document

[ Enercon Project Instruction (P1-02)

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Includes drilling, well installation, surface and downhole geophysical testing, geologic mapping, and laboratory testing.

  • Data Collection Plan
  • Work Plan (DCP)
  • lnstructions-Preparation of DCP
  • lnstructions-Preparation of Work Plan
  • Instructions-Preparation of Work Instructions
  • Document Control Register JI

Quality Assurance

  • TXU contracted Enercon Services to perform COLA development under the Enercon Services' QA Program
  • Geotechnical field investigation, laboratory testing, and engineering analysis performed by William Lettis &

Associates and Fugro is performed under the Enercon Services' Quality Assurance Project Plan

Geologic and Geotechnical Site Characterization

  • Characterize subsurface with existing (FSAR) and new data
  • Sufficient new exploration to confirm and refine site stratigraphy
  • Evaluate site subsurface variability
  • Develop site profile for ground motion response

" Identify possible geologic hazards

  • Verify Vendor plant design parameters

" Prepare Conceptual Foundation/Geotechnical Design

  • Characterize groundwater conditions (water table, confined aquifers, dewatering requirements)
  • Evaluate rock excavatibility and excavation support

Exploration Protocol

" Work will follow formal Enercon QA Program

" Performed by qualified, experienced geologists/engineers

" Senior Review (licensed professionals)

" Formal Internal Technical Review (ITR)

" Conformance to NRC RG 1.132, RG-1.138

" Satisfy vendor and SSI data requirements

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Field Exploration Methods

Rock Coring (NQ, HQ sizes)

(Phases 1 and 2)

Borehole Pressuremeter Testing (Phase 2)

Seismic Downhole and P-S Suspension Velocity Measurements (Phases 1 and 2)

Borehole Televiewer Profiles (Phases 1 and 2)

Gamma and Caliper Profiles (Phases 1 and 2)

Seismic Refraction and Gravity (Phase 2)

Spectral Analysis of Surface Waves (SASW) (Phase 2)

Borehole Packer Testing (Phase 2)

Cone Penetration Test (CPT)

Soundings (Phase 2 potential)

Groundwater Monitoring Wells (Phase 1)

Geologic Mapping (Phase 2)

Test Pit Excavation and Mapping (Phase 2)

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MONTHLY PROGRESS REPORT NO. 10 PERIOD ENDING AUGUST 31, 1975 2"

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NUMBER 87 AUGUST 8, 1975 TEXAS UTILITIES SERVICES, INC.

COMANCHE PEAK STEAM ELECTRIC STATION 1980-82 2300 MW INSTALLATION TURBINE GENERATOR AREA. BOTTOM-PUMPING CONCRETE INTO UNIT 1 CIRCULATING WATER DISCHARGE TUNNEL; TOP-SCALING SOUTH EXCAVATION WALL. VIEW TO SOUTHWEST

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Laboratory Testing Program GEOTECHNICAL INDEX GEOTECHNICAL INDEX Moisture Content and Density Specific Gravity Petrographic Thin Section Carbonate Content Consolidation X-Ray Diffraction/Mineralogy Corrosion Grain Size Proctor Atterberg Limits and Indices (soil)

Slaking Durability (core)

Organic Content California Bearing Ratio (CBR)

Test

Laboratory Testing Program GEOTECHNICAL STRENGTH Unconfined Compression (core)

Unconfined Compression with Modulus (core)

Unit Weight and Density (core)

Triaxial CU (3-point)

Direct Shear (3-point)

DYNAMIC TESTING X-ray of UD Samples Prior to Shipping Resonant Column/Torsional Shear Testing (University of Texas - Austin)

Lab Shear Wave Velocity (modulus)

Project Organization Responsibilities Site Geotechnical Investigations

  • WLA provides field project management for geotechnical and geologic data collection tasks

" WLA Site Coordinator provides supervision of the day-to-day field activities

  • Rig Geologist is assigned full-time with a drill rig.

Responsibilities include:

Verify drilling or testing operations are conducted in conformance with specified procedures Document sample or test depths and test results Maintain field logs of borings, including classification of materials recovered and description of geotechnical soil properties Chain-of-custody document preparation and logging samples

Geotechnical Borehole Procedure

" Work Instructions issued to drilling companies and Rig Geologists defining duties

  • Boring Assignments for each borehole prepared by WLA Site Coordinator. Boring assignments specify:

Boring location Boring type Boring depth Required tests Boring Completion Rig Geologist directs Drill Crew to prepare drill site and perform drilling per Boring Assignment Rig Geologist monitors drilling, describes samples, maintains field log Modifications to Boring Assignment instructions, if needed, reviewed and approved by Site Coordinator

  • Samples transported to site storage facility at end of each day

Current Site Activities

  • Borings 22 geotechnical borings completed or in progress
  • Testing Caliper Gamma Seismic Downhole and P-S Suspension Velocity Measurements Borehole Televiewer Profiles
  • Monitoring Wells 20 monitoring well clusters installed

Safety

" Personal protective equipment requirements

" Incident reporting (including near misses)

  • Inclement weather precautions
  • Potential hazardous insects/reptiles
  • Plant access requirements

Q&A

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