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
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
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
Remote System Monitoring
•Reliability
•Capabilities
•Immediate problem notification
•Power outages
•Filter loading
•Equipment failure
•Cost effective
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
Alarms/Response
Alert Probable Cause Shift Tech ActionLow pressure Torn filter, degraded tubing
or degraded pumpContact HPSupervisionEnter alert in HP log
High pressure Excessive filter loading Contact HPSupervisionEnter alert in HP log
A/C Power Loss GFI breaker tripLoss of power from supplysource.
Contact HPSupervisionEnter alert in HP log
A/C PowerRestored
A/C power restored totelemetry device and airsample pump.
None
Preventive maintenance
• Rebuild pumps – annually
• Calibrate gas meters – semi-annually
• Verify air flow – semi-annually or as needed
• Inspect equipment for degradation – bi-weekly
Filter Load Trend Plot
Plate Yard Trend
2.22.25
2.32.35
2.42.45
2.52.55
2.62.65
Date
Vac
Pre
ssur
e
Series1
Filter change
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%
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
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 increaseRatio 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
Administrative Controls
• REMP evaluates the need for increased sampling when:– ODCM monthly and instantaneous limits are exceeded– Failed fuel– Outages
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