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Ultrasonic Flow Meters - Nuclear

CALDON LEFM Ultrasonic Flow Meters offer the industry durable, stable, and low-cost-of-ownership ultrasonic measurement options. Sensia's commitment to developing cutting-edge ultrasonic technology to meet industry demands for custody transfer is commendable. With more than 50 years of experience and a history of technological firsts, the multipath inline ultrasonic flowmeters provide a strong foundation for reliable measurement.
 
Designed to help satisfy customer needs with the broadest product range for custody transfer of natural gas, CALDON LEFM Flow Meters provide
  • improved meter reliability over a wide range of application conditions
  • improved safety for technicians when replacing transducers
  • simplified installation, reduced meter footprint, and overall metering section weight
  • reduced maintenance.


CALDON LEFM 2010FE System

The CALDON LEFM 2010FE Nuclear Feedwater Temperature and Flow Meter system is designed with precision in mind. By locating the transducers on the pipe surface to create four acoustic paths, the system is able to measure the transit time of acoustic pulses sent between transducer pairs. This, along with pipe dimensions and water properties, allows for the determination of average axial velocity, aiding in the calculation of volumetric and mass feed water rates.

The system is engineered to measure mass feed water flow within ±1% and average bulk feed water temperature within ±2° F (±1.1° C). It comprises an electronics unit, fixture, transducers, and transducer cables per feed water loop or common header. Additionally, it can include a router for totalizing and communication functions, offering multiple analog outputs and serial communications for data acquisition and interface with plant equipment.

Known for its reliability and low maintenance requirements, the system provides preventive diagnostic indicators and continuous online testing to ensure correct operation within specified accuracy. Any detected faults outside the specified accuracy generate failure indications, with provisions for fault isolation and quick repair of defective components due to its modular hardware design.

 

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CALDON LEFM 2010MSE System

The CALDON LEFM 2010MSE Moisture Separator Drain Flow Meter is a precise and reliable instrument used to measure moisture separator drain flow. This is essential in evaluating the efficiency of the moisture separator system. The meter employs acoustic transducers positioned on the outside of the pipe to calculate the average velocity within the pipe. This velocity is then multiplied by the cross-sectional area of the pipe to determine the volumetric flow rate. The precision of the meter is within +/- 2 to +/- 3% of the flow, which may slightly vary depending on the size of the drain pipe and installation conditions.

With externally mounted transducers, the installation process is straightforward and does not require any cutting of the pipe. It is also a low-maintenance option and offers continuous online verification to ensure all components are functioning properly. Whether used for one-time efficiency measurements during plant start-up or for long-term monitoring, the CALDON LEFM 2010MSE Moisture Separator Drain Flow Meter is a cost-effective solution for accurately measuring flow in challenging applications.

CALDON LEFM 2010MSE Moisture Separator Drain Flowmeter Product Sheet

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CALDON LEFM 2010RCT System

Introducing the innovative CALDON LEFM 2010RCT Reactor Coolant Average Temperature Meter - a system renowned for its exceptional reliability, minimal maintenance requirements, and advanced diagnostic capabilities. This cutting-edge system boasts continuous online testing to ensure operations fall within the prescribed accuracy parameters. In the event of any anomalies, the system promptly notifies operators through on-screen messages, analog outputs, and serial interfaces.
 
Ensuring precise measurement of reactor coolant system (RCS) bulk average temperatures, the CALDON LEFM 2010RCT Reactor Coolant Average Temperature Meter offers a groundbreaking solution. With two fixtures housing transducers - six for the hot leg and four for the cold leg, the meter is mounted externally on existing piping. This ingenious design eliminates the need for cumbersome RTD bypass loops or costly alterations to the plant's infrastructure. The fixtures meticulously position the transducers on the hot and cold leg pipe surfaces to establish acoustic paths. These paths facilitate the transmission of acoustic waves between transducer pairs, aiding in the calculation of fluid bulk average temperature by integrating transit times, pipe dimensions, and water's acoustic properties.
 
The CALDON LEFM 2010RCT Reactor Coolant Temperature Meter revolutionizes temperature measurements by delivering superior accuracy and reliability compared to single-point RTDs. Traditional RTDs often struggle with temperature stratification in hot legs, leading to substantial biases of up to ±3° F (±1.66° C) and heightened uncertainties in differentials between hot and cold leg temperatures. In stark contrast, the advanced technology of the CALDON LEFM 2010RCT reduces the uncertainty in RCS differential temperature to a remarkable ±1° F (±0.55° C). By eliminating RTD biases, this system creates a more substantial margin between calculated RCS flow and the minimum flow requirements specified in technical guidelines.
 
The CALDON LEFM 2010RCT Reactor Coolant Average Temperature Meter system comprises two electronic units, two fixtures, 10 transducers, and 10 transducer cables per loop - catering to both hot and cold legs. The electronic units feature user-friendly panels displaying loop temperatures and system status, ensuring ease of operation and monitoring. For seamless data acquisition and integration with plant equipment, the system offers versatile analog (4 to 20 mA) and serial (RS232) outputs. Additionally, optional configurations are available to accommodate specific measurement needs, allowing for either hot leg or cold leg exclusive temperature measurements.
 

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CALDON LEFM 2010SG System

THE CALDON 2010SG Steam Generator Blowdown Flow Meter offers accurate volumetric measurement for steam generator blowdown flow. It involves installing a fixture and two transducers per line externally on the current piping. This approach eliminates the necessity to cut the blowdown lines and avoids costly analyses needed for plant design modifications.
 
The fixture plays a critical role in positioning the transducers precisely on the pipe surface of each loop to establish an acoustic path. By sending acoustic pulses back and forth between the pairs of transducers, the transit time of the pulses is carefully measured. This transit time, in conjunction with the pipe dimensions, is utilized to calculate the volumetric flow. Subsequently, the blowdown flow is generated as an output for external thermal power computation. The CALDON 2010SG Steam Generator Blowdown Flow Meter offers a cost-effective solution for measuring blowdown rate with a high level of accuracy, ranging from +/- 2% to +/- 5% of maximum flow (based on a single-phase fluid). However, the achievable accuracy is contingent upon the size of the blowdown piping and the specific installation conditions of the system.
 
Using the measurement for blowdown rate in thermal power computation will improve the uncertainty of the calculation by +/- 0.05%. The resulting power update from this improvement in colorimetric calculation uncertainty can potentially improve plant revenue by $100K per year.
 

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CALDON LEFM CheckPlus C and CheckPlus M Flow Meter

The CALDON LEFM CheckPlus Feedwater Flow Meter Systems represent the pinnacle of accuracy in feedwater flow measurement specifically tailored for nuclear power plants. Leveraging the reliability of well-established ultrasonic transit-time technology, our CALDON LEFM CheckPlus Feedwater Flow Meters achieve a remarkable level of precision with a typical uncertainty of merely 0.3%. This exceptional accuracy holds true irrespective of the prevailing upstream hydraulic conditions. By adopting this minimal uncertainty value in safety calculations outlined in 10CFR50 Appendix K, rather than the 2% benchmark demanded by conventional metering technologies, plant operators stand to elevate power generation potential by up to 1.7%. This operational enhancement directly translates into substantial financial gains, yielding millions of dollars in additional revenue annually.
 
Within the realm of existing nuclear power plants, the CALDON LEFM CheckPlus Feedwater Flow Meter has garnered official endorsement from prominent regulatory bodies, including the US Nuclear Regulatory Commission (NRC) and various international regulators. This accreditation extends to utilizing the meter as a fundamental component for measurement uncertainty recapture (MUR), enabling plant operators to achieve uprates of up to 1.7%. Such recognition underscores the credibility and reliability of the CALDON LEFM CheckPlus Feedwater Flow Meter in enhancing operational performance within established nuclear facilities.
 

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