Abstract
Neutron flux monitoring systems form an integral part of the design of a Generation IV sodium cooled fast reactor. Diverse possibilities of detector systems have to be investigated with respect to practicality and feasibility according to the detection parameters. In this paper, we demonstrate the feasibility of using self powered neutron detectors as in-core detectors in fast reactors for detecting local changes in the neutron flux distribution. We show that the gamma contribution from fission products decay and activation of structural materials and sodium is very small compared to the fission gammas. Thus, it is possible for the in-core SPND signal to follow changes in local neutron flux as they are proportional to each other. This implies that the signal from an in-core SPND can provide dynamic information on the neutron flux perturbations occuring inside the reactor core.
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