David Perkins

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Seabrook StationBiweekly Airborne Sampling

• David Perkins
• david_perkins_at_fpl.com

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Objectives

• Improve system reliability
• Improve regulatory confidence
• Reduce out-of-service time
• Improve program efficiency and maintain a system
  of continuous sampling.

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Bi-weekly Sample Feasibility

• Ability to increase sample frequency
• Equipment reliability
• Ability to achieve sensitivity for short-lived
  isotopes
• Impact on charcoal efficiency
• Excess filter loading
• Eliminate missed samples

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What We Found

• Remotely monitor equipment with telemetry and
  vacuum sensing transducer
• Maintain equipment with preventative maintenance
• Evaluation of I-131confirmed ability to achieve
  comparable sensitivity during 2-week collection
  period
• Charcoal efficiency testing for 2-week run time
  successful
• Effluent program informs REMP when I-131 release
  limits are exceeded for sample frequency
  adjustments

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Automatic Remote Monitoring
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Remote System Monitoring

• Reliability
• Capabilities
• Immediate problem notification
• Power outages
• Filter loading
• Equipment failure
• Cost effective

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TelemetricT646 MicroRTU

• Off-the-shelf proven technology
• Six digital inputs, four analog inputs six
  control outputs
• Automatically communicates pressure, flow and
  other sensing signals
• Capable of alert and alarm functions
• Operating parameters are remotely programmable
  and remotely selectable
• Low cost to buy and operate

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How Telemetric Solution Works
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Flow Diagram with Telemetry
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Alarms/Response
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Equipment Maintenance
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Equipment Arrangement
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Preventive maintenance

• Rebuild pumps
• annually
• Calibrate gas meters
• semi-annually
• Verify air flow
• semi-annually or as needed
• Inspect equipment for degradation
• bi-weekly

14
Equipment Upgrades
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Filter Loading Charcoal Efficiency
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Filter Load Trend Plot
Filter change
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Rock Pile1-Week 2-Week
1-Week March 2004
2-Week June 2004
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Filter Load Trend Plot
Filter change
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Plate Yard2-Week
June 2004
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Charcoal Efficiency Testing

• Sample cartridges tested for 336 hours
• 3 tests performed
• 2 cfm flow rate
• Test method, ASTM D-3803-98
• Results equal to or better than 99.30

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I-131and 2-Week Sample Cycle
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I-131 Decay

• 1-week Vs. 2-week air sampling cycle
• Hypothetical models
• Assuming chronic air concentrations
• MDA equal to or better than the 1-week cycle.
• Higher collection factor compensates for decay
• Modest air flow increase

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Iodine Decay

• 1-week Vs. 2-week air sampling cycle
• Models show increased collection factors for flow
  rates
• 1-week flow rate 2-week flow rate Activity
  increase Ratio 2wk 1wk
• 1.0 cfm 1.8 cfm 2.79 times 0.99
• 1.0 cfm 1.5 cfm 2.31 times 0.82
• 1.5 cfm 2.7 cfm 2.86 times 0.98
• 1.5 cfm 1.5 cfm 1.55 times 0.55

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Administrative Controls

• REMP evaluates the need for increased sampling
  when
• ODCM monthly and instantaneous limits are
  exceeded
• Failed fuel
• Outages

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How is 2-Week Sampling working ?

• Saved missed samples and out-of-service time
• Utility turned power supply off without
  notification
• Contacted utility and loss of power restored in
  2-hours
• 150 hours of OOS time saved
• Equipment problem discovered
• Low pressure detected from tube connection leak
• 72 hours of OOS time saved
• System performs more reliably
• Filter loading is monitored more closely
• Slightly increasing over 2-weeks, but NOT
  excessively

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Questions?