METHOD FOR NUCLEAR CHANNEL REACTOR FUEL CYCLE Russian patent published in 2021 - IPC G21C1/00 

FIELD: nuclear physics and equipment.

SUBSTANCE: invention relates to the operation of a nuclear channel reactor during the entire regulated service life without shutting down the reactor for reloading burnt nuclear fuel (fuel assemblies - FA) in process channels. Method includes formation of reactor core for reactor output to planned power level by loading into FA reactor and control and protection system (CPS) cores when monitoring quality of reactor core loading formation and compliance with nuclear safety requirements, as well as current state of reactor, and maintenance of neutron-physical characteristics and process parameters of reactor in specified limits by means of overload without stopping reactor of burnt-out FA and movement of CPS rods. Determining the nuclear fuel burnup in each FA of the reactor, forming a FA candidate overload list, selecting FA with maximum burnup, order of their overload is set, reactor operation is modeled taking into account planned overloads. When determining FA overload sequence, simulating a dormant etched subcritical state of the reactor with immersion of all CPS rods, except for emergency protection rods in the core, is determined by calculating in this state of the reactor power distribution in the core and power of all fuel assemblies, from the formed list, selecting FA with minimum power and performing its replacement, and then simulating working state of reactor, in which position of rods corresponds to their position in critical state at power, and also, optionally, compensation for non-uniformities of energy release. Subsequent substitutions of FA are carried out in a similar way.

EFFECT: technical result is higher efficiency of fuel use.

1 cl, 7 dwg