Spent Fuel Pool Level Instrumentation Technology...
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Technology Through-Air Radar Guided Wave Radar Bubbler System Thermal Dispersion Pressure Transducer The overall simplest and least expensive solution with best regulatory certainty. Proven in nuclear. Technology with nuclear unique radiation proof parts and in-pool installation of stilling well. Technology has been widely abandoned due to higher h/w and maintenance costs. Custom made for each application, installs six measurement channels per pool. Mineral insulated cable at risk in strong water movement, strain gauge must survive extreme radiation. Cost System, Installation Low — Four simple-to- install, off-the-shelf components: sensor electronics, waveguide pipe, horn antenna, and display with integrated back-up power. High — Six main parts: sensor electronics, conduit, coax cable, connector, waveguide cable, stilling well. Rad-proof coax cable, connector and stilling well are hard to install. High — Many parts, some moving: Compressed air, air flow regulator, bubbler tube, and pressure transmitter. High — Complex (2 level signals and 1 temperature signal per measurement point). Many components, 1E qualification and in-pool installation may increase price /risk. Medium — Four main components: Transducer, mineral insulated cable (must be radiation qualified), electronics and compensation. Impact to Liner and Spent Fuel Pool Low — No parts in the pool, non-contact measurement. Liner not touched, no in-pool mounting, independent from pool water forces. High — Stilling well requires significant mounting in pool and at pool edge. High — >20 ft bubbler tube is in pool and requires a separate support structure mounted to fuel racks or liner to survive water forces in seismic event. High — >20 ft sensing structure is in pool and requires a separate support structure mounted to fuel racks or liner to survive water forces in seismic event. Medium — Liner not affected, but parts in water (contact measurement with cable and transducer in water). Maintenance Calibration, Operation Low — No drift, OEM does not require calibration. No boron crystal buildup. Simple in-situ calibration. Med/High — Boron crystal buildup. Difficult calibration with sensitive coax-to- stainless steel connector. High — Frequent bubbler tube cleaning to prevent plugging from boron crystal buildup. Air system requires filter changes, potential cleaning. System drift requires regular re-calibration. Medium — Permanent condensation and continuous water movement can lead to incorrect level indication. Affected by water forces during event. Medium — In-situ calibration is relatively simple. No boron crystal buildup. System drift requires regular re-calibration. Affected by water forces during event. Accuracy in Adverse Conditions such as Boiling, Steam, Smoke, Radiation, Debris High — Debris, saturated steam, dense smoke and boiling water have insignificant effect on measurement accuracy, as witnessed by customers. Electronics located outside radiation field. Low — Measurement stops where debris touches cable. Stilling well protects cable from debris. Can not allow debris to enter stilling well. Stilling well affected by water forces during event. Low — Measurement affected by change in water temperature or density, boiling and bubbling. Affected by water forces during seismic event. Medium — RTD and wire insulation close to fuel have to survive high radiation field. Affected by water forces during event. Medium — Minimal impact from water temperature changes. Room pressure changes affect measurement unless compensated. Power Consumption Battery Backup Low — 0.5 watts 120V AC or 24V DC. 8 AA type lithium batteries sufficient for 2.5 yrs. operating 30 mins. per day. Low High — Requires large batteries (e.g., car) or generators for backup power. High — Requires large batteries (e.g., car) or generators for backup power. Low Spent Fuel Pool Level Instrumentation Technology Comparison AREVA Inc. For more information, contact Joel Farrar Tel: 434 832 3492, [email protected] or your VP, Key Accounts: 3315 Old Forest Road, Lynchburg, VA 24501 Tel: 704 805 2410, [email protected] www.us.areva.com ©2012 AREVA Inc. All rights reserved. The data and information contained herein are provided solely for illustration and informational purposes and create no legal obligations by AREVA. None of the information or data is intended by AREVA to be a representation or a warranty of any kind, expressed or implied, and AREVA assumes no liability for the use of or reliance on any information or data disclosed in this document.
Transcript of Spent Fuel Pool Level Instrumentation Technology...
Technology Through-Air
Radar
Guided Wave
Radar
Bubbler
System
Thermal
Dispersion
Pressure
Transducer
The overall simplest and least expensive solution with best regulatory certainty. Proven in nuclear.
Technology with nuclear unique radiation proof parts and in-pool installation of stilling well.
Technology has been widely abandoned due to higher h/w and maintenance costs.
Custom made for each application, installs six measurement channels per pool.
Mineral insulated cable at risk in strong water movement, strain gauge must survive extreme radiation.
CostSystem, Installation
Low — Four simple-to-install, off -the-shelf components: sensor electronics, waveguide pipe, horn antenna, and display with integrated back-up power.
High — Six main parts: sensor electronics, conduit, coax cable, connector, waveguide cable, stilling well. Rad-proof coax cable, connector and stilling well are hard to install.
High — Many parts, some moving: Compressed air, air fl ow regulator, bubbler tube, and pressure transmitter.
High — Complex (2 level signals and 1 temperature signal per measurement point). Many components, 1E qualifi cation and in-pool installation may increase price /risk.
Medium — Four main components: Transducer, mineral insulated cable (must be radiation qualifi ed), electronics and compensation.
Impactto Liner and Spent Fuel Pool
Low — No parts in the pool, non-contact measurement. Liner not touched, no in-pool mounting, independent from pool water forces.
High — Stilling well requires signifi cant mounting in pool and at pool edge.
High — >20 ft bubbler tube is in pool and requires a separate support structure mounted to fuel racks or liner to survive water forces in seismic event.
High — >20 ft sensing structure is in pool and requires a separate support structure mounted to fuel racks or liner to survive water forces in seismic event.
Medium — Liner not aff ected, but parts in water (contact measurement with cable and transducer in water).
MaintenanceCalibration, Operation
Low — No drift, OEM does not require calibration. No boron crystal buildup. Simple in-situ calibration.
Med/High — Boron crystal buildup. Diffi cult calibration with sensitive coax-to-stainless steel connector.
High — Frequent bubbler tube cleaning to prevent plugging from boron crystal buildup. Air system requires fi lter changes, potential cleaning. System drift requires regular re-calibration.
Medium — Permanent condensation and continuous water movement can lead to incorrect level indication. Aff ected by water forces during event.
Medium — In-situ calibration is relatively simple. No boron crystal buildup. System drift requires regular re-calibration. Aff ected by water forces during event.
Accuracyin Adverse Conditions suchas Boiling, Steam, Smoke, Radiation, Debris
High — Debris, saturated steam, dense smoke and boiling water have insignifi cant eff ect on measurement accuracy, as witnessed by customers.Electronics located outside radiation fi eld.
Low — Measurement stops where debris touches cable. Stilling well protects cable from debris. Can not allow debris to enter stilling well. Stilling well aff ected by water forces during event.
Low — Measurement aff ected by change in water temperature or density, boiling and bubbling. Aff ected by water forces during seismic event.
Medium — RTD and wire insulation close to fuel have to survive high radiation fi eld. Aff ected by water forces during event.
Medium — Minimal impact from water temperature changes. Room pressure changes aff ect measurement unless compensated.
Power
ConsumptionBattery Backup
Low — 0.5 watts 120V AC or 24V DC. 8 AA type lithium batteries suffi cient for 2.5 yrs.operating 30 mins. per day.
Low High — Requires large batteries (e.g., car) or generators for backup power.
High — Requires large batteries (e.g., car) or generators for backup power.
Low
Spent Fuel Pool Level Instrumentation Technology Comparison
AREVA Inc.For more information, contact Joel FarrarTel: 434 832 3492, [email protected] your VP, Key Accounts:3315 Old Forest Road, Lynchburg, VA 24501Tel: 704 805 2410, [email protected]
©2012 AREVA Inc. All rights reserved. The data and information contained herein are provided solely for illustration and informational purposes and create no legal obligations by AREVA. None of the information or data is intended by AREVA to be a representation or a warranty of any kind, expressed or implied, and AREVA assumes no liability for the use of or reliance on any information or data disclosed in this document.
Spent Fuel PoolLevel Instrumentation
