METHOD FOR CALIBRATING NUCLEAR REACTOR NEUTRON FLUX DENSITY MEASURING CHANNEL IN ABSOLUTE UNITS OF POWER Russian patent published in 2007 - IPC G01T3/00 

FIELD: measurement technology; calibrating channels for measuring nuclear-reactor neutron flux density in absolute units of power; monitoring these channels for proper functioning in checking nuclear power plants for safe condition.

SUBSTANCE: proposed method for calibrating channels designed for measuring nuclear power plant neutron flux density in absolute units of power includes evaluation of maximal linearity range of mentioned measuring channel wherein calibration is made whereupon positive step-by-step variation in reactivity of nuclear reactor held in subcritical or critical condition is introduced to transfer reactor to supercritical condition with power rising continuously; in the process neutron flux density and medium temperature of nuclear reactor are measured and recorded; then results obtained and transient equations of nuclear reactor kinetics are used to calculate variations in reactivity with time including corrections for temperature effect of reactivity; maximal measurement range for neutron flux linearity is set considering stability of calculated reactivity in this range including corrections for temperature effect; then absolute power of reactor is measured for one value of neutron flux density within mentioned linear range, and absolute value of reactor power is measured by way of foil activation or calorimetry.

EFFECT: extended calibration range of channel for measuring neutron flux density in absolute units of power.

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