Measuring Moderator Temperatures In a CANDU Reactor

Abstract

Performing measurements in a power reactor by means other than the built-in instrumentation is at best difficult. The main obstacles are: 1. the difficulty of gaining access and, 2. radiation effects on the sensors. In support of its analysis of fuel channel integrity during loss of coolant accidents.Ontario Hydro has undertaken to measure moderator temperatures in CANDU reactors. A technique has been developed and applied successfully in two different units. In the second test, the accuracy was better than +-1.4 degrees C.