Abstract
A theoretical assessment of channel fission gas monitoring as against channel delayed neutron (DN) monitoring for pressurized heavy water reactors has been made to enable identification of channels in which failed fuel might reside. The analysis is based on experimentally observed steady-state fractional releases for 133Xe and from it the computed fractional releases for 88Kr, 87Kr, 87Br and 137I. Three types of defective fuel, namely fuel with slow release defects, fast release defects and recoil release defects have been individually considered. Effects of tramp U and fractional release variation on the channel outlet activity of DN precursors have been evaluated. Influences of degassification of the coolant and burst release following a power ramp/trip on the channel ( sig + bkg) bkg ratios have been studied.
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