METHOD FOR ADJUSTING DIGITAL REACTIMETERS TO CURRENT STATE OF REACTOR BY COMPOSITION OF FUEL FISSIONABLE ELEMENTS Russian patent published in 2005 - IPC

FIELD: monitoring safety characteristics and variables of nuclear power units at nuclear power stations.

SUBSTANCE: proposed method that can be used, for instance, to adjust reactimeters of nuclear power stations with type RBMK-1000 and incorporates provision for reducing systematic measurement error by two orders of magnitude includes introduction of sets of variables characterizing correlation between fissionable elements of fuel and desired burn-up step in charge-coupled device module of reactimeter; determination of current value of mean fuel burn-up using data of centralized checkup system of reactor unit; and selection of respective mentioned variables by varying position of switch on rear panel of reactimeter. Use is made of sets of variables α_i (fractions of i group delayed neutrons in delayed neutron generation responsible for total composition of fissionable isotopes of desired burn-up fuel) and sets of variables λ^eff (effective constants of i group delayed neutrons). Reactimeter adjustment scale is calibrated in terms of mean fuel burn-up in reactor core.

EFFECT: enhanced measurement accuracy, and nuclear safety, facilitated adjustment to current state of reactor by composition of fissionable elements of fuel.

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