Analysis of In-Situ TRIH Biases

Abstract

Our paper describes a novel method to determine the constant systematic error (bias) in the temperature RTDs of the Reactor Inlet Headers (TRIH). This is done by analysing the TRIH responses to a reactor run-up. This method provides an independent check for TRIH biases which are directly measured by removing the RTDs from their thermowells, placing them in an oven, and comparing their responses to a high-precision RTD. Overall, work on assessing TRIH errors has resulted in a significant reduction in PHT boundary condition uncertainties and a subsequent decrease in required operating margins.