Patent ID: 8804894

Claim:
A method of correction for a component of intrinsic uncertainty, associated with a collectron-type detector placed inside a nuclear power plant core, comprising: establishing a mapping as a representation of a power distribution inside the nuclear reactor core, said mapping being established by means of a reference instrumentation system, said mapping comprising; equipping, at least temporarily, a first set of fuel assemblies of the nuclear reactor core with detectors from said reference instrumentation system; equipping, at least temporarily, a second set of fuel assemblies of the nuclear reactor core with detectors from a second instrumentation system; performing a first partial series of activity measurements by means of the detectors from said reference instrumentation system; performing a second partial series of activity measurements by means of the detectors from the second instrumentation system; converting the activity measurements of the second partial series of measurements into activity measurements associated with said reference instrumentation system in order to obtain a series of converted measurements; establishing, by way of the first partial series of activity measurements, of the series of converted measurements, of a complete theoretical distribution of the theoretical activities associated with the reference instrumentation system, and of a complete theoretical distribution of the theoretical activities associated with the second instrumentation system, for every instrumented point of the nuclear reactor core, a final series of experimental reactor core activities, said data series only comprising the values relating to the activities associated with the reference instrumentation system; and establishing, based on the final series of experimental data and of theoretical data simulating a state of the reactor core at the time of the performance of the first partial series of measurements and of the second partial series of measurements, the mapping being representative of a power distribution inside a nuclear reactor core performing a calibration operation on a collectron, the calibration operation being performed when the collectron-type detector has reached a given level of wear, the calibration operation consisting of performing a three-dimensional calibration using the mapping.