Tritium Management by Design - University Of...
Transcript of Tritium Management by Design - University Of...
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Tritium Management Tritium Management by Designby Design
Caryl IngramDuke Energy
Paul D. SaundersSuncoast Solutions, Inc.
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HistoryHistory• EPRI Report “Strategies for Managing Liquid
Effluents – Options, Actions & Results” – # 1008015 released in 2003
• Developed by EPRI & a team of industry experts– Liquid radioactive waste processing– Liquid and solid effluents– Chemistry
• The industry’s liquid effluent activity continues to trend down. This is good!
• Sensible long-term liquid processing effluents strategy evaluation
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Balanced Effluents Program (BEP)Balanced Effluents Program (BEP)
• EPRI Effluents Strategy Project – Reaffirmed the importance of balancing a site’s liquid,
solid, and gaseous effluents
• Tritium management is one area that many stations continue to struggle to manage – Production– Concentration– Control– Consequences
• Environmental impact, site exposure, cost
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Historical “Solutions”Historical “Solutions”
• Several stations use unique tritium strategies – Operational – Processing
• Not always coordinated with other programs• Not always effective
– Increased inventory– Spikes, increased plant exposure, etc.
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““Treatment” OptionsTreatment” Options
• ‘Conventional’ disposal with solid waste– Can’t ion exchange, concentrate, cost
effectively remove, place into solid form• Release as Effluent
– Liquid: varies by site– Gaseous: used by all plants
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IssuesIssues
• Limiting production of H-3 • 3H concentrations in coolant will increase
– Later planned releases result in “obvious” spikes in liquid effluent activity
• ANI premium impact• Public perception, risk becoming public opinion issue
• Managing effluent source mechanisms– Manage releases, temperature, humidity, air exchange– Airborne dose > Liquid dose
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Issues Issues (continued)(continued)
• Plants were designed, constructed, and licensed to release liquid and gaseous effluents
Zero release = zero production• Evaluating and comparing plants on the basis of liquid
volume and activity discharged may– Lead to erroneous performance evaluation– Impact cost effectiveness of program– Increase dose to workers– Increase dose to the public
• HOW DO I MAINTAIN A SUCCESSFUL, DEFENSIBLE PROGRAM?
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The PlanThe Plan
• EPRI tasked by utilities to develop an interactive tritium analytical software tool to evaluate actual or proposed program changes
• Project directed and supported by an industry expert team
Primary GoalMake informed decisions that support a
Balanced Effluents Program
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ObjectivesObjectives
• Develop interactive tritium analytical tool– Input actual and hypothetical plant data – Based on site ODCM and operating practices
• Use that information to:– Evaluate program changes– Track and trend data
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Objectives (continued)Objectives (continued)• Provide graphical output display
– Capture production, inventory, and effluents• Real time or projected values for tritium
concentrations• Additional reports as recommended by a
utility support team• The tool not intended to replace existing
pathway modeling software– Is intended to complement its effectiveness.
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ID Plant Design PerformanceID Plant Design Performance
• Generic production mechanisms• ID plant specific mechanisms• Define plant specific boundaries
– Design– FSAR
• Inventory
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Quantify Actual PerformanceQuantify Actual Performance
• Production Calculation– Quantify plant specific results– ID current plant goals
• Inventory– Plant values/ quantities– Known and design unknown (sumps, etc)– Other unknown (unidentified, analytical error)– Point of origin for tritium inventory – Inventory impact factors
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Quantify Actual PerformanceQuantify Actual Performance(cont.)(cont.)
• Effluents – Accountability by effluent stream – ODCM– NO PATHWAY MODELING IN THIS TOOL
• Mass Balance– Perform a mass balance
• Production, inventory, and effluents – V&V model and define current state
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Evaluate ResultsEvaluate Results(investigation phase)(investigation phase)
• Benchmark plant effluent values with Industry Experience– Regulatory– EPRI– ANI– INPO– Possible link to Industry sources
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Evaluate Design vs. Actual Evaluate Design vs. Actual (investigation phase)(investigation phase)
• Consequence Analysis – ODCM & R.G. 1.109 pathway analysis, dose
• Identify each forms’ contribution to environmental impact
– Compare analysis results to model & design predictions
– For each effluent stream and pathway analysis
• Determine reason for discrepancies• Conduct source analysis of abnormal results
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Consequence AnalysisConsequence Analysis(cont.)(cont.)
– Evaluate current performance impact• Effluent values versus pathway impact• Effluent values versus on site exposure• Baseline cost analysis• Define intangible and soft issues
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Evaluate OptionsEvaluate OptionsImprovement or RedirectionImprovement or Redirection
• Liquid – Recycle primary water– Recycle all waste– Alter release strategy
• Develop strategic release protocol (feed and bleed)
• Solid waste– Treatment, VR, and disposition options
• Solidify• Incineration• Pyrolosis• Direct burial environmental impact
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Evaluate OptionsEvaluate OptionsImprovement or RedirectionImprovement or Redirection
• Airborne– Evaporator use– Inventory tanks/ pools– Release elevation– Atmosphere temperature– Humidity– Leaks– Containment purges– Stack flow rate– Dehumidify– Cooling towers
• SFP (impacts all three forms)– Inventory manipulation
• Temperature, HVAC, humidity• Investigate new technology
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Acceptability Determination Acceptability Determination Performance OptionsPerformance Options
• Evaluate acceptability of results – Benchmark, site specific results, consequences, investigation
results, costs
• Identify improvement opportunities• Define potential path forward• Perform an impact analysis (sensitivity) for each option
– Cost benefit– Consequence– Mass balance– Pathway analysis– Intangible/ soft issues/factors/benefits
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Completion PathCompletion Path
• Plan/Recommendation– Develop management plan– Prioritized actions– Goals – success measurement– Document plan with supporting documentation
• Approval– Peer group – sanity validation– Senior management – concurrence and resources
• Validation– Evaluate actual results versus plan projections
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Multi Year ProjectMulti Year Project
• Driven by utility sponsorship• 2004
– Developed a technical skeleton for software– Team concept
• EPRI• Utilities – 16 involved!• DOE WSRS• Contractors• ANI
– One meeting conducted in 2004
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20052005
• One meeting hosted by Duke Energy• Focus
– Tritium management tool for delivery to utilities
– Document development– Model outline and functionality
• Final document with working spreadsheet based model due December 2005.
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Model Outline Model Outline -- ProductionProduction
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Model Outline Model Outline -- RemovalRemoval
Sludge
Monitored Liquid Releases
ConcentratesProcessing Media
(Filter/Septa, Ion Exchange, Carbon)
Plant Liquid and Gaseous Leakage
Monitored Gaseous Releases
Planned Solid Disposal
DAW/Metal
Go To Inventory
From Production
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Model Outline Model Outline --InventoryInventory
Waste/Off Gas
Refueling Water Storage
Liquid Waste
Letdown/Recycle Holdup Tank
Reactor Water Makeup
Boric Acid Storage Sum = In -Plant Inventory
Tanks
Secondary System (Hotwell/Feed/Condensate)
Containment Air Space
(Production?)
RCS
Pools(Spent Fuel, Other)
Sumps
Condensate Storage
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Model Outline Model Outline –– ExEx--Plant InventoryPlant Inventory
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EnvironmentEnvironment--toto--Plant Interface Plant Interface ConsiderationsConsiderations
• Environmental samples• ODCM impact• Downstream cooling water intakes• Plant HVAC intakes• Groundwater• Surface runoff
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Long Term Impact ConsiderationsLong Term Impact Considerations
• Decommissioning • Ground water monitoring
– Wells– Where– How often
• Current leakage mitigation versus future monitoring and remediation
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Path ForwardPath Forward
• 2006?– Software has not been funded to date– Requires utility support through EPRI
fund direction
• Ideas?• Questions?• Concerns?