Search - Number 20 - DETERMINATION OF CONSERVATIVE PARAMETERS OF MODEL OF REACTOR FOR RESEARCH OF TRANSIENT OF VVER-1000

DETERMINATION OF CONSERVATIVE PARAMETERS OF MODEL OF REACTOR FOR RESEARCH OF TRANSIENT OF VVER-1000
Cover not present DETERMINATION OF CONSERVATIVE PARAMETERS OF MODEL OF REACTOR  FOR RESEARCH OF TRANSIENT OF VVER-1000
Category: Number 20
Publication: 20
Summary

The article considers the computational model of the reactor VVER-1000 on the basis of the point neutron ki-netics including the feedback on the reactivity effects as well as variations in the basic parameters of the model from temperatures and pressures present in the fuel and coolant during the transient processes. Interest in the point model of a neutron reactor kinetics explained by the fact that modeling with the help of three-dimensional neutron codes of transient process in VVER-1000, caused by the tripping of accelerated unit unloading due to failure of the primary equipment of power generating unit is significantly different from those observed in practice for a number of important parameters such as on the rate of increase of the neutron power after falling of one group control rods. During the operation in design mode of accelerated unit unloading on several units with VVER-1000 occurred scrams over the period of the reactor, which has not previously been observed. The article represents results of simulation and comparison with real data obtained during the operation of accelerated unit unloading on VVER-1000 nuclear power plants of Ukraine at different fuel campaign moments. Conservative model parameters are defined for the analysis of reactivity accidents.
Keywords: VVER, interacting codes, kinetics model of neutrons in a reactor, accelerated unit unloading, reac-tivity accident.

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