Detecting neutron spectrum perturbations due to coolant density changes in a small lead-cooled fast nuclear reactor.

Highlights: [•] We model void in a small lead-cooled fast reactor. [•] We examine the changes neutron-spectrum in various scenarios. [•] We use a combination of two fission-chambers to detect the void. [•] The detector-response is dependent on the position of the detectors. [•] The use of fission chambers to detect voiding appears as a promising monitoring technique. [Copyright &y& Elsevier]