Contribution to the Power Distribution Methodology Uncertainties Assessment

Jiří Švarný, Czech Republic, SKODA JS a.s.

18th Symposium of AER on VVER Reactor Physics and Reactor Safety (2008, Eger, Hungary)
Fuel cycles , uncertainty calculations

Abstract

The present methodology of safety margins in NPP Dukovany design power distribution calculations is based on the philosophy of engineering factors with errors defined on the bases of statistical approach of standard (95%) confidence intervals. On the level of FA power distribution the normality (normal density distribution) of this approach is tested and comparison with errors defined on the 95-percent probability at a 95-percent confidence level (shortly in statistics 95%/95%)) is provided. Practical applications are presented for several NPP Dukovany fuel cycles. The paper also deals briefly with difference between confidence interval and tolerance interval, with the problems of density distribution of mechanical engineering factor variables and solution of axial and radial error distribution like bivariate problem.

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