The program executed in Stage 18 consists of the following three parts:
- Application of CoreSim with a two-dimensional model of vibrating fuel assemblies, for the calculation of ex-core detector noise throughout a fuel cycle;
- An investigation of the neutron noise, induced by propagating perturbations, in various thermal and fast reactor systems, in two-group theory;
- A consistent derivation of the point kinetic term of the noise in circulating fuel reactors and an analysis of the of the deviation from traditional system;
- Development of a simulation model to simulate bubbly two-phase flow with axially dependent void fraction and void velocity.