1. How REP works. Reminder
1.1 Internal instrumentation for PWRs
The measurement of a neutron flux, i.e. of uncharged particles, always involves a neutron/matter interaction, which in turn creates particles capable of producing a measurable electric current. Each time a neutron is absorbed, the atoms of this sensitive material are transformed and no longer exist as such.
The material chosen to undergo this interaction will be consumed and disappear at a rate that depends on the intensity of the neutron flux and the probability of occurrence of the reaction (effective absorption cross-section). The higher this probability, the higher the current supplied, but, on the other hand, the faster the sensitive material will disappear, ultimately necessitating rapid replacement of the sensor....
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How REP works. Reminder
Functional requirements for PWR instrumentation
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Appendix – Description of treatments performed
(Mathematical development by Gérard RIO, Process Technical Development Department at Framatome - ANP)
Calculation of theoretical power distribution
We have already seen that we need to compare measured power (activity) and calculated power (activity) in instrumented assemblies.
Since the signal from fission detectors is proportional...
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