Abstract
There is no detector in the active zone of HTR-PM (High-Temperature-Reactor Pebble-bed Module). The main way to monitor the power distribution of HTR-PM is through ex-core neutron detectors. Besides neutron detectors, there are thermocouples which are arranged in the side-reflector of HTR-PM, and they might be helpful in the power distribution reconstruction. In this paper, reconstruction method which uses thermocouple readings was developed based on Harmonic Synthesis Method, Improved Harmonic Synthesis Method and Newton Method. And the method was tested in numerical simulations. The results show that the method is correct and the characteristic of convergence is not sensitive to the initial value. But the robustness of the method is not good enough and the reconstruction method couldn’t be used in practice before the robustness of the method being improved.
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