Abstract
Abstract The neutron emission-rate (NER) method for burnup measurement of a spent LWR fuel bundle submerged in water has been studied by focusing on the spatial higher harmonics effects inevitable for the application of a formula based on the one-point reactor model. Verification studies of this method have been made through calculations and simulation experiments using the fresh UO2 fuel-rod bundles of n x n arrays (3ℓnℓ23, 0.22ℓk effℓ0.94), and its applicability has been shown for the spent fuel bundle. As a practical example, an actual formula has been given for a spent PWR fuel bundle of 14×14 array of 3.5 wt% initial enrichment and cooling time of 1,000 days.
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