Columbia Generating Station, Energy Northwest Presentation Slide ...
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618-11 Project StatusPresentation to NRC
Zach Dunham10/18/2012
618-11 Remediation Project
Protecting the Columbia River
Purpose of Meeting
• Provide informational update to NRC on planned efforts to remediate the 618-11 site
• Describe potential impacts to CGS
• Planned efforts to mitigate impact areas
• Discuss CGS Licensing Basis Impacts
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Agenda
• Introductions • Overview/Review of 618-11 Site• Status & Schedule for Remediation
• Non-Intrusive Characterization (NIC)• Site Infrastructure• Remediation – Phase 1 (Trenches & VPUs)• Remediation – Phase 2 (Caissons)
• Overview of Supporting Safety/Impact Analysis• DOE• EN
• CGS Licensing Basis Impacts
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Protecting the Columbia RiverOverview / Review
of 618-11 Site 4
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618-11 Project Drivers
• CERCLA Record of Decision signed in 2001 Technology alternative selected requires removal of waste from
trenches, VPUs, and caissons; treating as necessary and disposing.
• Hanford Federal Facility Agreement and Consent Order Tri-Party Agreement between State of Washington, EPA, and
the DOE Legally binding agreement with enforceable milestones
Milestone M-16-00B – Complete by Sept 2018 all 300 area remedial actions (including 618-10 and 618-11 Burial Grounds)
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Overview / Reviewof 618-11 Site
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618-11 Remediation Project
Existing Vehicle Barrier
Aerial View of 618‐11 Site(Adjacent to CGS)
UPR 600-22*
618‐11 Site
New Vehicle Barrier
UPR – Unplanned Release Site6
North
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618-11 Burial Ground
• Operated by DOE from 1962 – 1967• 375 x 1000-ft rectangle oriented east-west• Approximately 8.6 acres in size• ~50,000 yd3 of DOE defense waste in:
3 trenches (88% of total) 50 vertical pipe units (VPUs)(11% of total) 4 caissons (1% of total)
• Estimated Inventory for 618-11 Site 4,200 Ci Sr-90 5,300 Ci Cs-137 226 Ci Am-241 132 Ci Pu-239 639 Ci Pu-241 330 kg Beryllium
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Overview / Reviewof 618-11 Site
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Waste Forms / Potential Hazards
618-11 Burial Ground
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Overview / Reviewof 618-11 Site
• Low- to high-activity radioactive waste including fission products
• Spent nuclear fuel residues• Plutonium-contaminated waste• Residual quantities of chemical waste associated
with laboratory and fuel manufacturing processes• Solid waste contaminated with beryllium • Tritium
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VPU’s
Trenches
618-11 Burial Ground
Trench 1
Trench 2
Trench 3
50 - VPU’s
4 - Caissons
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Overview / Reviewof 618-11 Site
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Trench Wastes618-11 Burial Ground
Typical Hanford Trench During Remediation
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Overview / Reviewof 618-11 Site
NOT FROM618-11
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Trench Wastes618-11 Burial Ground
Hanford Drums from Previous Remediations
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Overview / Reviewof 618-11 Site
NOT FROM618-11
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Vertical Pipe Unit (VPU)618-11 Burial Ground
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Overview / Reviewof 618-11 Site
• VPUs are constructed of five 55-gallon drums
• Each VPU is 22 inches in diameter and 15 feet long
• 50 VPUs at 618-11
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Actual Geophysical InformationTypical Caisson Design
Caissons (Will be included in Phase 2 Remediation)618-11 Burial Ground
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Overview / Reviewof 618-11 Site
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for Remediation 1414
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Start with 618-10 to Gain Experience• 618-10 Site
• Similar waste types (VPUs & Trenches)• Located ~3.5 miles south of CGS
• Non-Intrusive Characterization Complete • Lessons Learned Applied to 618-11
Number of analyses per VPU Response/control of contamination
• Trench Remediation• In Progress• Lessons Learned being captured
• VPU Remediation • Will be initiated prior to 618-11 VPU efforts• Lessons Learned will be applied to 618-11
Approach to Remediating 618-11 Site
Status & Schedulefor Remediation15
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Remediation of 618-11 will be Performed in Two Phases
• Non-intrusive Characterization (Completed)
• Phase 1 – Remediation (~Spring 2014 Start) Trench Campaign VPU Campaign UPR-600-22
• Phase 2 - Remediation (~2015 Start) Caisson Campaign
• All Activities Completed by September 2018
Status & Schedulefor Remediation
Schedule for Remediating 618-11 Site
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NON-INTRUSIVE CHARACTERIZATION
Installation of Cone Penetrometers for VPU Characterization at 618-11
Status & Schedulefor Remediation17
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NON-INTRUSIVE CHARACTERIZATION
Activities conducted to support remedial action planning
• Conducted geophysical delineation of the caissons and VPU’s
• Installed 2 cone penetrometers at each VPU• Conducted in-situ radioactivity measurement
of each VPU using a gamma dose rate GM Probe
• Survey results showed highest radiation readings near bottom of VPUs18 VPUs < 100 mR/hr18 VPUs 100 mR/hr to 1 R/hr14 VPUs > 1 R/hr up to 9R/hr
• Results showed ~20 VPUs are suspected to be TRU Waste
Status & Schedulefor Remediation18
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Proposed Site Layout for Remediation Operations
Status & Schedulefor Remediation19
Energy NorthwestCGS
Infrastructure to Support618-11 Remediation
clean soilstockpiles
clean soilstockpiles
618-11 Burial Ground
UPR-600-22
CGS CAM’s
Drum Storage
Support Trailers
Dedicated Access Road
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• Implement Controls derived from the “Hazards, Requirements & Consequences” such as: Limit the available ‘Material at Risk’ at any one time Utilize distance and barriers Plan immediate ‘response’ contingencies
• Apply Past Practices and Lessons Learned 3 Energetic Events & 1 Airborne Release (2007-2012)
• Monitor for Compliance ON SITE Sampling & Monitoring (personnel, equipment and field
placed devices, etc.) OFF SITE (visual observations, environmental sampling stations,
event-air monitoring stations, etc.)
Remediation Planning for 618-11
Status & Schedulefor Remediation20
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Trench Campaign
Status & Schedulefor Remediation
Trench Campaign at 618-10
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Emission ControlsTrench Campaign (Past Practices & Lessons Learned)
Waste will be maintained below grade and covered with layer of clean cover soil after sorting.
Fixatives applied at the excavation face.
Exposed waste will be limited to the area of excavation.
All work suspended when wind speed exceed 20 mph.
Status & Schedulefor Remediation
Typical Trench Campaign
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Drums are placed inside salvage drums at the edge of excavation using heavy equipment
Drums are cradled within the excavator bucket for removal
Spill Controls
Front-end loader is manned and staged during all drum handling
Fire Response
Status & Schedulefor Remediation
Trench Campaign (Past Practices & Lessons Learned)
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Vertical Pipe Unit (VPU) Campaign
• Scope is to stabilize, characterize, retrieve, package and transport waste (50 VPUs at 618-11)
• Waste disposal will either be to DOE’s Environmental Restoration Disposal Facility (ERDF) or DOE’s Central Waste Complex (CWC) pending characterization
Status & Schedulefor Remediation24
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Vertical Pipe Unit (VPU) Campaign
Status & Schedulefor Remediation25
Vibratory Hammer
Over-Casing
Surrounding Soil
Over-Casing (~30-ft long x 4-ft diameter)
Drive Over-Casing Around VPU
VPU Surrounded in Over-Casing with some Adjacent Soil
Install Over-Casing
Step 1
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Vertical Pipe Unit (VPU) Campaign
Status & Schedulefor Remediation26
Step 2In-Situ Stabilization
Auger Attachment
Augering Tool Enclosure
Rotary Drilling Rig
Over-Casing
VPU
In-Situ Stabilize Over-Casing ContentsPosition Drilling Rig over VPU
Status & Schedulefor Remediation26
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Vertical Pipe Unit (VPU) Campaign
Status & Schedulefor Remediation27
Step 3Characterization
Status & Schedulefor Remediation27
Load sample into 55-gal
drumCore Sample String
Retrieve Representative Sample
On-Site Analysis for Shipping
CWC Analysis for Radiological Determination
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Step 5
Step 4
Vertical Pipe Unit (VPU) Campaign
Mass Excavation Removal
If Material Meets Disposal Facility Waste Acceptance Criteria
Status & Schedulefor Remediation28
Status & Schedulefor Remediation28
Load, Transport to ERDF
Grouted VPU
Grouted VPU
Grout TruckGrout Pump
Grout Swivel Head
Grout Injection
Step 4AGrout Injection
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Vertical Pipe Unit (VPU) Campaign
Status & Schedulefor Remediation
If Material Does Not Meet Disposal Facility Waste Acceptance Criteria
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Retrieval Device
Waste Meeting ERDF WAC
Retrieval Enclosure
Conveyor
Retrieval System
Suspect TRU Waste to CWC
Grout Drums
Step 4BDrum by Drum Removal
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Vertical Pipe Unit (VPU) CampaignFull Size-VPUs Proof of Concept Tests
• VPUs placed in 8’ diameter sleeves
• Backfilled around VPUs with Hanford surrogate soil
• Installed 4’ diameter over-casings
• Tests performed with various augers
• Retrieved materials using rock auger and bucket auger
Status & Schedulefor Remediation30
Simulated VPU
Overcasing Installation
Auger Bit
Size Reduced VPU Contents
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DOE Safety Basis Analysis
• Documented Safety Analysis (10 CFR 830) Development of Material at Risk Hazard/Accident Analyses Dose Consequence analyses (Mitigated & Un-Mitigated)
• Fire Hazard Analysis (DOE Order 420.1B) Fire Protection Approach General Fire Protection Program & Features Task-Specific Fire Protection Programs & Features Design Fire Scenarios
• Emergency Preparedness Hazards Analysis (DOE Order 151.1C) Releases & Work Activities of Interest Distances of Interest DOE’s Emergency Action Level (EAL) Events Design Features, Controls and Results
Safety Basis Documentation
Overview of SupportingSafety/Impact Analysis32
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• The hazard analysis considers initiators such as: Ignition sources Energy sources Explosive sources Chemical reactions External events Natural phenomena events
• The accident analysis evaluates events such as: Fires Spills Impacts (low and high energy) Explosions Deflagrations External and natural phenomena events
DOE Safety Basis Analysis
Overview of SupportingSafety/Impact Analysis33
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Energy Northwest will evaluate the DOE 618-11 Safety Basis for the following:
Impact on Columbia Generating Station
• Control Room Habitability • Dose to the Control Room personnel will not exceed
regulatory requirements• < 5 Rem during an accident.• < 4 mg/m3 beryllium concentration
• Access is available to all power block buildings and components
• Ability of workers to safely access the site and normal work locations
EN Impact Analysis
Overview of SupportingSafety/Impact Analysis34
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Impact on CGS Emergency Plan• CGS Emergency Plan has previously been revised to
incorporate EAL Classifications based on potential incidents at 618-11 during non-intrusive characterization.
• The Plan will be reevaluated to ensure it is adequate for the remediation phase.
• Impact on ERO facilities • Access to ERO facilities• Staffing of ERO• Appropriate EAL categorization of 618-11 Events• Consistency & coordination between DOE & EN
emergency plans
EN Impact Analysis
Overview of SupportingSafety/Impact Analysis35
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Impact on Security Plan • The vehicle barrier has been relocated to support 618-11 remediation
activities. Evaluate for other impacts.
Impact on the health and safety of the general public• All Energy Northwest employees, contractors and visitors are
considered members of the public with respect to DOE events. Dose to these individuals need to be maintained <100 mrem/year from routine operations at 618-11.
• Dose from an accident event (probability <10-2/year) would be maintained < 1 Rem/year (DOE Evaluation Limit).
EN Impact Analysis
Overview of SupportingSafety/Impact Analysis36
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Memorandum of Understanding • Two previous versions established
MOU for Non-Intrusive Characterization Efforts MOU for Implementation of Supporting Infrastructure
• MOU for remediation currently under discussion
This legal document outlines responsibilities of the 3 parties that will delineate actions to accomplish integration of the following:
• Emergency Plans for 618-11 and Columbia• Security• Lines of communications, emergency planning/reporting• Mitigation activities• Protection of Public Health & Safety• Liability (Personnel, Property & Business Losses)• Joint training & response drills
Overview of SupportingSafety/Impact Analysis
EN Impact Analysis
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CGS Licensing Basis Impact
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CGS Licensing Basis Impact• Utilize DOE Safety Basis analysis and documentation• Perform impact analyses of CGS systems
ALARA Emergency Preparedness Environmental Fire Protection Control Room Habitability Physical Security
• Identify mitigation and/or required changes to CGS Licensing Bases• Document in screening analysis ( eg. 50.59 / 50.54(p) / 50.54 (q) )• Submit appropriate documentation for NRC approvals• Coordinate with NRC during review process
39CGS Licensing Basis Impact
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QUESTIONS?