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Related Experiment Video

Updated: Sep 11, 2025

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In Situ Response Time Measurement of RTD Based on LCSR Method.

Yanyong Song1, Yi Liang1, Zhenwen Zhang1

  • 1School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

Sensors (Basel, Switzerland)
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

A new in situ measurement device using the loop current step response (LCSR) method accurately assesses resistance temperature detector (RTD) response times in nuclear power plant piping. This method shows strong correlation with traditional plunge tests, ensuring reliable performance monitoring.

Keywords:
loop current step responseplunge testresistance temperature detectorsresponse time

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Area of Science:

  • Nuclear Engineering
  • Instrumentation and Measurement
  • Thermal Science

Background:

  • Conventional plunge tests for Resistance Temperature Detectors (RTDs) have limitations in evaluating response times under actual nuclear power plant operating conditions, especially within confined piping.
  • Accurate RTD response time is critical for nuclear safety and operational efficiency.

Purpose of the Study:

  • To develop an in situ measurement device to overcome limitations of conventional RTD testing.
  • To establish a reliable correlation between in situ measurements and traditional plunge test results.
  • To validate the performance of the developed device under simulated nuclear power plant conditions.

Main Methods:

  • Development of an in situ measurement device utilizing the Loop Current Step Response (LCSR) method.
  • Establishment of a conversion relationship between LCSR and plunge test results via numerical simulation.
  • Experimental validation in a rotating water channel across a flow velocity range of 0.2 to 0.6 m/s.

Main Results:

  • Excellent agreement was observed between second-order-converted LCSR and plunge test measurements, with a deviation of only 3.78% at 0.6 m/s.
  • Both methods consistently indicated reduced RTD response times at higher flow velocities.
  • Deviations between the methods remained within ±10%, meeting nuclear instrumentation standards (NB/T 20069-2012).

Conclusions:

  • The LCSR method provides a reliable approach for in situ assessment of RTD response times.
  • The developed LCSR device maintains a strong correlation with established laboratory plunge test methods.
  • This in situ capability enhances the monitoring and maintenance of critical instrumentation in nuclear facilities.