Void fraction determination using neutron noise measurements

An area of interest for Chalmers University, motivating this new collaboration, is related to NPP needs. It concerns the measurement of in-core neutron noise for axial void profile reconstruction. Simulations have been run to calculate the noise signal in a NPP assuming a simple 1D bubble distribution and show how the void fraction and velocity profiles can be reconstructed from noise measurements. The motivation of these experiments is to develop a setup to validate experimentally the method in-core.

Figure: Top and side view of the bubbling channel.