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ECN publication
Neutron fluence measurement in the cavity of Balakovo Nuclear Power Plant, unit 3. (Revised report)
Published by: Publication date:
ECN NUC 1-3-1999
ECN report number: Document type:
ECN-I--98-017 Other
Number of pages: Full text:
41 Download PDF  

In order to reduce the uncertainty of fluence measurements in NuclearPower Plants (NPPs) in particular VVER-1000 reactors, an international benchmark exercise was organised by the Russian GOSATOMNADZOR. The benchmark consists among others out of irradiation and measuring of sets of activation monitors and analysis of measured and calculated data produced by various institutes, adjustment of the calculated neutron spectra and evaluation of the damage neutron field parameters and their uncertainties at the location of the measurements. This report is a revised version, taking into account the conclusions of the Balakovo Workshop in Rossendorf. Results are presented from the neutron spectra calculated with the Monte Carlo Code TRAMO by Forschungs Zentrum Rossendorf, adjusted with the reaction rates obtained from the monitor sets from ECN. The adjusted spectra have been used to determine the neutron fluence (rate) above 0.1, 0.5 and 1.0 MeV. With respect to the first version of this report experimental data have been added for the reaction "93Nb(n,n'). The data for the reaction "63Cu(n,aalpha) and the fission reactions have been revised. Also more realistic estimates are presented for the uncertainties in the measured activities. The influence on the result of the change in fluence rate during constant reactor power and deviations in some of the reactions rates have been investigated as well. 15 refs.

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