Fast neutron fluence measurement system for nuclear reactor, associated installation, measurement method and computer program product

摘要

The invention relates to a measuring system (2) comprising: - a detector (8) comprising: • an optical waveguide (16) comprising a primary dopant capable of transmuting, by capture of a neutron, into a dopant secondary stable and less neutron absorbing 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, information relating to a secondary dopant concentration in the waveguide; and • from the information on the calculated secondary dopant concentration, determine a fluence of fast neutrons for a predetermined secondary time. Figure for the abstract: figure 2