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Simulation and Analysis of Neutron Noise Caused by the Bowing Phenomenon of Fuel Assemblies in VVER-1000 Reactor
, Ph.D. Dissertation Sharif University of Technology ; Salehi, Ali Akbar (Supervisor) ; Vosoughi, Naser (Co-Supervisor)
Abstract
The Lateral deformation of Fuel Assembly (FA) under the operational conditions of the reactor cores is called FA bowing. This phenomenon is caused by factors such as thermal and hydraulic loads on FAs in the reactor core. It can lead to disturbances in the movement of control rods inside of FAs, cross-contact of FAs in refueling, and also changes in power distribution The bowing phenomenon causes a local change in the distance between the FAs. that results in a neutronic perturbation that affects the power distribution and its asymmetry. Considering the change of boric acid concentration during the operation cycle of the reactor, this neutronic perturbation is time-dependent. that is a very...