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David Perkins david_perkins@fpl

David Perkins david_perkins@fpl.com. Seabrook Station Biweekly Airborne Sampling. Objectives. Improve system reliability Improve regulatory confidence Reduce out-of-service time Improve program efficiency and maintain a system of continuous sampling. Bi-weekly Sample Feasibility.

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David Perkins david_perkins@fpl

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  1. David Perkins david_perkins@fpl.com Seabrook StationBiweekly Airborne Sampling

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

  3. 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

  4. 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

  5. Automatic Remote Monitoring

  6. Remote System Monitoring • Reliability • Capabilities • Immediate problem notification • Power outages • Filter loading • Equipment failure • Cost effective

  7. 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

  8. How Telemetric Solution Works

  9. Flow Diagram with Telemetry

  10. Alarms/Response

  11. Equipment Maintenance

  12. Equipment Arrangement

  13. 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

  15. Filter Loading & Charcoal Efficiency

  16. Filter Load Trend Plot Filter change

  17. Rock Pile1-Week & 2-Week 1-Week March 2004 2-Week June 2004

  18. Filter Load Trend Plot Filter change

  19. Plate Yard2-Week June 2004

  20. 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%

  21. I-131and 2-Week Sample Cycle

  22. 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 I-131 Decay

  23. 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 Iodine Decay

  24. REMP evaluates the need for increased sampling when: ODCM monthly and instantaneous limits are exceeded Failed fuel Outages Administrative Controls

  25. 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

  26. Questions?

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