2007 International RERTR Meeting

Abstracts and Available Papers Presented at the Meeting

The Determination of Neutron Energy Spectrum in Reactor Core C1 of Reactor VR-1 Sparrow

M. Vins
Department of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering,
Czech Technical University, V Holesovickach 2, 180 00, Prague 8, Czech Republic

ABSTRACT

This contribution overviews neutron spectrum measurement, which was done on training reactor VR-1 Sparrow with a new nuclear fuel. Former nuclear fuel IRT-3M was changed for current nuclear fuel IRT-4M with lower enrichment of 235U (enrichment was reduced from former 36% to 20%) in terms of Reduced Enrichment for Research and Test Reactors (RERTR) Program. Neutron spectrum measurement was obtained by irradiation of activation foils at the end of pipe of rabit system and consecutive deconvolution of obtained saturated activities. Deconvolution was performed by computer iterative code SAND-II with 620 groups' structure. All gamma measurements were performed on Canberra HPGe. Activation foils were chosen according physical and nuclear parameters from the set of certificated foils. The Resulting differential flux at the end of pipe of rabit system agreed well with typical spectrum of light water reactor. Measurement of neutron spectrum has brought better knowledge about new reactor core C1 and improved methodology of activation measurement.

 

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