THE METHODOLOGICAL COMPONENTS OF THE ENGINEERING FACTORS AND THEIR ALTERNATIVE DETERMINATION
22nd Symposium of AER on VVER Reactor Physics and Reactor Safety (2012, Průhonice, Czech Republic)
ENGINEERING FACTORS
Abstract
The macrocode qualification is key point of the redefinition of the engineering factor
methodological component. A hyperbolic dependence of the methodological component on
the power level is not strict requirement and from the point of some safety criteria, e.g. radial
fuel rod power limitation, can be simplified.
In the paper is presented development of the methodological component of volume
power distribution (engineering factor F0 ) like the prediction interval and trapezoidal width
of confidence of linear regression including simultaneous interval (Scheff? correction). The
adequate regression analysis was realized on comparisons of macrocode MOBY-DICK power
distribution with SPD measured power distributions for VVER core. There were determined
standard deviations calculated versus measured power distributions like time and spatially
varying uncertainty.
In reference to the above-mentioned standard deviations the true values of power
distribution were determined (according the Bayes? methodology) for nodal volume power
peaking K V . In this sense there were realized alternative evaluations of the methodological
components of engineering factor F0 .