ML12292A164

Energy Northwest Presentation Slide to NRC on 618-11 Remediation 10-18-2012

ML12292A164
Person / Time
Site:	Columbia
Issue date:	10/18/2012
From:	Dunham Z Energy Northwest
To:	Lauren Gibson Plant Licensing Branch IV
Gibson L
References
Download: ML12292A164 (40)

Text

618-11 Project Status Presentation to NRC Zach Dunham 10/18/2012 618-11 Remediation Project

ProtectingtheColumbiaRiver 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 2

ProtectingtheColumbiaRiver 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 3

ProtectingtheColumbiaRiver Overview / Review of 618-11 Site 4

ProtectingtheColumbiaRiver 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) 5 Overview / Review of 618-11 Site

ProtectingtheColumbiaRiver 618-11 Remediation Project ExistingVehicle Barrier AerialViewof61811Site (AdjacenttoCGS)

UPR 600-22*

61811Site NewVehicle Barrier UPR - Unplanned Release Site 6

North

ProtectingtheColumbiaRiver 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 7

Overview / Review of 618-11 Site

ProtectingtheColumbiaRiver Waste Forms / Potential Hazards 618-11 Burial Ground 8

Overview / Review of 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

ProtectingtheColumbiaRiver VPUs Trenches 618-11 Burial Ground Trench 1 Trench 2 Trench 3 50 - VPUs 4 - Caissons 9

Overview / Review of 618-11 Site

ProtectingtheColumbiaRiver Trench Wastes 618-11 Burial Ground Typical Hanford Trench During Remediation 10 Overview / Review of 618-11 Site NOT FROM 618-11

ProtectingtheColumbiaRiver Trench Wastes 618-11 Burial Ground Hanford Drums from Previous Remediations 11 Overview / Review of 618-11 Site NOT FROM 618-11

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) 618-11 Burial Ground 12 Overview / Review of 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

ProtectingtheColumbiaRiver Actual Geophysical Information Typical Caisson Design Caissons (Will be included in Phase 2 Remediation) 618-11 Burial Ground 13 Overview / Review of 618-11 Site

ProtectingtheColumbiaRiver Status & Schedule for Remediation 14 14

ProtectingtheColumbiaRiver 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 & Schedule for Remediation 15

ProtectingtheColumbiaRiver 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 & Schedule for Remediation Schedule for Remediating 618-11 Site 16

ProtectingtheColumbiaRiver NON-INTRUSIVE CHARACTERIZATION Installation of Cone Penetrometers for VPU Characterization at 618-11 Status & Schedule for Remediation 17

ProtectingtheColumbiaRiver NON-INTRUSIVE CHARACTERIZATION Activities conducted to support remedial action planning

• Conducted geophysical delineation of the caissons and VPUs

• 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 VPUs 18 VPUs < 100 mR/hr 18 VPUs 100 mR/hr to 1 R/hr 14 VPUs > 1 R/hr up to 9R/hr

• Results showed ~20 VPUs are suspected to be TRU Waste Status & Schedule for Remediation 18

ProtectingtheColumbiaRiver Proposed Site Layout for Remediation Operations Status & Schedule for Remediation 19 Energy Northwest CGS Infrastructure to Support 618-11 Remediation clean soil stockpiles clean soil stockpiles 618-11 Burial Ground UPR-600-22 CGS CAMs Drum Storage Support Trailers Dedicated Access Road

ProtectingtheColumbiaRiver

• 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 & Schedule for Remediation 20

ProtectingtheColumbiaRiver Trench Campaign Status & Schedule for Remediation Trench Campaign at 618-10 21

ProtectingtheColumbiaRiver Emission Controls Trench 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 & Schedule for Remediation Typical Trench Campaign 22

ProtectingtheColumbiaRiver 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 & Schedule for Remediation Trench Campaign (Past Practices & Lessons Learned) 23

ProtectingtheColumbiaRiver 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 DOEs Environmental Restoration Disposal Facility (ERDF) or DOEs Central Waste Complex (CWC) pending characterization Status & Schedule for Remediation 24

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) Campaign Status & Schedule for Remediation 25 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

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) Campaign Status & Schedule for Remediation 26 Step 2 In-Situ Stabilization Auger Attachment Augering Tool Enclosure Rotary Drilling Rig Over-Casing VPU In-Situ Stabilize Over-Casing Contents Position Drilling Rig over VPU Status & Schedule for Remediation 26

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) Campaign Status & Schedule for Remediation 27 Step 3 Characterization Status & Schedule for Remediation 27 Load sample into 55-gal drum Core Sample String Retrieve Representative Sample On-Site Analysis for Shipping CWC Analysis for Radiological Determination

ProtectingtheColumbiaRiver Step 5 Step 4 Vertical Pipe Unit (VPU) Campaign Mass Excavation Removal If Material Meets Disposal Facility Waste Acceptance Criteria Status & Schedule for Remediation 28 Status & Schedule for Remediation 28

Load, Transport to ERDF Grouted VPU Grouted VPU Grout Truck Grout Pump Grout Swivel Head Grout Injection Step 4A Grout Injection

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) Campaign Status & Schedule for Remediation If Material Does Not Meet Disposal Facility Waste Acceptance Criteria 29 Retrieval Device Waste Meeting ERDF WAC Retrieval Enclosure Conveyor Retrieval System Suspect TRU Waste to CWC Grout Drums Step 4B Drum by Drum Removal

ProtectingtheColumbiaRiver Vertical Pipe Unit (VPU) Campaign Full 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 & Schedule for Remediation 30 Simulated VPU Overcasing Installation Auger Bit Size Reduced VPU Contents

ProtectingtheColumbiaRiver Overview of Supporting Safety/Impact Analysis 31

ProtectingtheColumbiaRiver 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 DOEs Emergency Action Level (EAL) Events Design Features, Controls and Results Safety Basis Documentation Overview of Supporting Safety/Impact Analysis 32

ProtectingtheColumbiaRiver

• 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 Supporting Safety/Impact Analysis 33

ProtectingtheColumbiaRiver 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 Supporting Safety/Impact Analysis 34

ProtectingtheColumbiaRiver 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 Supporting Safety/Impact Analysis 35

ProtectingtheColumbiaRiver 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 Supporting Safety/Impact Analysis 36

ProtectingtheColumbiaRiver 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 Supporting Safety/Impact Analysis EN Impact Analysis 37

ProtectingtheColumbiaRiver 38 CGS Licensing Basis Impact

ProtectingtheColumbiaRiver 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 39 CGS Licensing Basis Impact

ProtectingtheColumbiaRiver 40 QUESTIONS?