SYSTEM FOR MEASURING FAST NEUTRON FLUENCE FOR A NUCLEAR REACTOR, ASSOCIATED INSTALLATION, MEASUREMENT METHOD AND COMPUTER PROGRAM PRODUCT

摘要

The invention relates to a measuring system (10) comprising: - a detector (8) comprising: • an optical waveguide (16) comprising a primary dopant capable of transmuting, by neutron capture, into a stable secondary dopant that is less neutron-absorbent than the primary dopant; • a moderation layer (18) suitable for slowing down fast neutrons; - an analysis device (10) connected to the detector and configured to: • inject, into the waveguide, an interrogation wave having a wavelength corresponding to an absorption peak of the secondary dopant; • detect a response wave emitted by the waveguide; • calculate, from the detected response wave, a piece of information relating to a concentration of secondary dopant in the waveguide; and • based on the information relating to the calculated concentration of secondary dopant, determine a fluence of fast neutrons during a predetermined secondary period.