Abstract: The object of the present invention is a method for establishing so-called “mixed IN-CORE mappings”. Its essential purpose is to compensate a loss of density of a reference instrumentation, called “RIC instrumentation” (or “RIC system”), when a significant number of locations, initially used by the sensors of the RIC system, are occupied by fixed collectron-type rods. An obvious physical interest lies in the increase of the measurement density, and thus of the level of confidence, associated with the operating results deduced from the processing of these measurements. One application of the method according to the invention concerns a collectron-type detector calibration method placed inside a nuclear reactor core.

Abstract: The object of the present invention is a method for establishing so-called “mixed IN-CORE mappings”. Its essential purpose is to compensate a loss of density of a reference instrumentation, called “RIC instrumentation” (or “RIC system”), when a significant number of locations, initially used by the sensors of the RIC system, are occupied by fixed collectron-type rods. An obvious physical interest lies in the increase of the measurement density, and thus of the level of confidence, associated with the operating results deduced from the processing of these measurements. One application of the method according to the invention concerns a collectron-type detector calibration method placed inside a nuclear reactor core.

Abstract: The invention relates to a method for obtaining (206) an error propagation uncertainty component (RUN2p) for any nuclear reactor including reactors intended to be provided with a measurement instrumentation system for which there is no operation feedback concerning the system in question For this purpose, the invention comprises the use of data (200) originating from experience feedback acquired with a reference instrumentation system, e.g. the core instrumentation reactor system The experience feedback is used to apply disturbances to a theoretical power distribution model (201), the spatial distribution and amplitude of said disturbances being such that the deviations observed (203) between the disturbed theoretical model and the theoretical model resulting directly from the calculation are representative of those observed in reality.