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Annals of Nuclear Energy, Volume 65, March 2014, Pages 35-40.
C. Montalvoa, A. García-Berrocala, J.A. Bermejob, C. Queralc
a – Applied Physics to Natural Resources Department, Technical University of Madrid (UPM), Ríos Rosas 21, 28003 Madrid, Spain.
b – Iberdrola Ingeniería y Construcción S.A.U., Av. Manoteras 20, 28050 Madrid, Spain.
c- Department of Energy Systems, Technical University of Madrid (UPM), Ríos Rosas 21, 28003 Madrid, Spain.
Abstract
The dynamic response of several RTDs located at the cold leg of a PWR has been studied. A theoretical model for the heat transfer between the RTDs and the surrounding fluid is derived. It proposes a two real poles transfer function. By means of noise analysis techniques in the time domain (autoregressive models) and the Dynamic Data System methodology, the two time constants of the system can be found. A Monte Carlo simulation is performed in order to choose the proper sampling time to obtain both constants. The two poles are found and they permit an advance in situ surveillance of the sensor response time and the sensor dynamics performance. One of the poles is related to the inner dynamics whereas the other one is linked to the process and the inner dynamics. So surveillance on the process and on the inner dynamics can be distinguished.
