Calculation of the neutron noise induced by shell-mode core-barrel vibrations in a 1-D 2-group 2-region slab reactor
Rapport, 2003

The subject of this work is the calculation of the in-core neutron noise, induced by the shell-mode vibration of the core-barrel. The original motivation was to investigate whether an out-of-phase behaviour can exist between the in-core and ex-core detectors lying on the same azimuthal position. To this order a two-region two-group diffusion model was used in one dimension. The noise was calculated in the adiabatic approximation. It was found that an out-of-phase behaviour can exist between in-core detectors, close to the core boundary, and the ex-vessel detectors, for large systems. In addition, due to the use of two-group theory, the strong local noise component at the boundary of the vibrating core was also found. The paper gives details of the calculations and the results.


Carl Sunde

Chalmers, Institutionen för reaktorfysik

Vasiliy Arzhanov

Chalmers, Institutionen för reaktorfysik



CTH-RF -Chalmers University of Technology, Department of Reactor Physics: 173

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