A High Order Method in Flux Mapping

Abstract

In flux mapping, the neutron flux distribution in a reactor core is synthesized by a linear combination of flux modes whose amplitudes are determined by a least-squares approximation to the measured flux values at flux detector sites. Consequently, there are inherent errors in the synthesized fluxes. This paper describes a High Order method which uses the mapping errors at the flux detector sites in conjunction with a set of error modes to deduce the mapping errors at other locations in the reactor and subsequently generates an improved flux map. The improvement is shown to be dependent on the quality of the flux detector signals.