Power Measurements in CANDU Reactors

Abstract

This paper is a review of current practice and future trends in power measurement in CANDU reactors. Out-of-core ion chambers at low power levels, and in-core self powered neutron detectors at high power levels are used as the primary means of measuring neutron flux. The method of calibration of both ion chambers and in-core detectors against independent thermal power measurements is reviewed. The role of an on-line continuous flux mapping system in CANDU 600 MWe reactors is discussed. First-order dynamic equations to match the dynamic response characteristics of Inconel and platinum clad Inconel detectors to power in the fuel and to neutron flux level have been derived.