The LEFM 2000RCT accurately measures reactor coolant changes in temperature in pressurized water reactors (up to 650 degrees F) to within 0.75 degree F. Accuracy is maintained throughout the cycle, even as core burn-up causes changes in hot leg temperature stratification. Temperature stratification in hot legs has caused biases of up to 2.0 degrees F, and increased uncertainty of typically 2.0 degrees F for conventional RTD measurements. LEFM 2000RCT measurements are used to evaluate actual flow margin through the reactor core instead of making conservative calculations. Margin measurement is often greater than calculations by 5%, allowing plants to extend steam generator life.

The 2000RCT transducers are mounted externally and do not require piping alteration for installation. Only a 12 inch run of straight pipe is required for installation of the transducers. Speed of sound is continually measured and used to calculate the temperature of the reactor coolant water. Speed of sound is measured along three paths, using 6 transducers, and result in a true bulk average temperature calculation.

The LEFM 2000RCT electronic unit is available in a wall mounted enclosure and contains the circuitry necessary to transmit and receive ultrasonic signals and perform necessary calculations to determine bulk fluid temperature.


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