Nuclear Reactor Power Level Measurement via Electrical Impedance
Solution Overview
Problem
Current methods for determining power levels in nuclear reactors are costly, complex, and require frequent maintenance, with existing solutions failing to provide simple, cost-effective compensation for LPRM detectors over the height of the core, and are prone to radiation exposure and contamination issues.
Innovation Solution
The use of two or more electrical conductors, one or more signal devices, and an analyzer to measure impedance values within the nuclear reactor, allowing for the determination of power levels through incident and reflected signals, which can replace or supplement gamma thermometers and TIPs, reducing the need for complex calibration and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma thermometers and TIPs are used to determine power levels, then measurement precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical detector systems (gamma thermometers and TIPs) with an electrical impedance measurement system. Electrical conductors are positioned within the core to sense power levels through impedance changes, eliminating the need for complex mechanical detector assemblies and their associated calibration and maintenance requirements.
Solution Approach 2:
The patent uses electrical conductors that replicate the functional role of gamma thermometers and TIPs by measuring power levels through a different physical mechanism (electrical impedance rather than radiation detection). This copying approach achieves the same measurement objective with simpler technology.
2Measurement precision
If gamma thermometers and TIPs are deployed, then power level determination accuracy is improved, but radiation exposure and contamination risks increase
Solution Approach 1:
The patent substitutes radiation-based measurement methods with electrical impedance measurement. The electrical conductors sense power levels through changes in their electrical properties caused by neutron flux, eliminating direct radiation exposure risks for the measurement system while maintaining measurement accuracy.
3Measurement precision
If complex calibration procedures are implemented for LPRM detectors, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces complex detector calibration procedures with direct electrical impedance measurements. The electrical conductors provide inherent compensation for detector responses through their physical positioning and electrical properties, eliminating the need for manual calibration operations.
Solution Approach 2:
The electrical conductor system automatically compensates for power level variations and detector responses through its inherent electrical properties. The system self-calibrates by measuring impedance changes directly at the conductor locations, eliminating the need for external calibration operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables continuous, accurate determination of power levels with improved reliability and reduced costs, simplifying reactor operations and maintenance while minimizing radiation exposure and contamination risks.
Implementation Method 1
measuring impedance values of two or more electrical conductors disposed in the nuclear reactor
Implementation Method 2
receive one or more reflected signals from the two or more electrical conductors
Data Source
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AI summary
The apparatus includes two or more electrical conductors, one or more signal devices, an analyzer and a time-domain reflectometer. The one or more signal devices may be adapted to apply one or more signals to the two or more electrical conductors and receive one or more signals from the two or more electrical conductors. The analyzer is adapted to determine power level in the nuclear reactor using at least one of the applied signals and at least one of the received signals. The method of determining power level in a nuclear reactor includes: measuring impedance values of two or more electrical conductors disposed in the nuclear reactor and using the measured impedance values to determine the power level.