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**Harvard**

Jonsson, A. (2012) *Neutronics in reactors with propagating perturbations*. Göteborg : Chalmers University of Technology (CTH-NT - Chalmers University of Technology, Nuclear Engineering, nr: 256).

** BibTeX **

@book{

Jonsson2012,

author={Jonsson, Anders},

title={Neutronics in reactors with propagating perturbations},

isbn={978-91-7385-703-1},

abstract={This thesis contains several studies of the properties of neutron noise, primarily in Molten Salt Reactors and other reactors with propagating perturbations. Both one- and two-group diffusion theory are employed to investigate the differences that arise from the movement of the fuel. Data corresponding to a thorium-fuelled thermal reactor is used to investigate the properties of a more realistic possible
realisation of an MSR system, as well as data corresponding to more traditional systems for contrast. Furthermore, the properties of the neutron noise from a vibrating absorber or fuel rod in a traditional reactor is investigated in a two-group, multi-region system.
For the MSR, the Green's functions and the dynamic adjoint functions are investigated in the general case of arbitrary fuel recirculation velocity and in the limiting case of infinite fuel velocity which permits simplified solutions both in the static and dynamic case. It is found that the amplitude of the induced noise is generally higher and the domain of the point kinetic behaviour valid up to higher frequencies than in a corresponding traditional system. This
is due to the differing behaviour of the delayed neutron precursors as compared to the traditional case.
The MSR equations are not self-adjoint and the adjoint equations and adjoint functions have to be constructed, which is also done here. Finally, the space-dependent
neutron noise, induced by propagating perturbations of the
absorption cross section is calculated. A number of interesting properties that are relevant to full size MSRs are found and interpreted. The results are consistent with those in traditional systems but the domains of various behaviour regimes (point kinetic, space dependent etc.) are shifted to higher frequencies or system sizes.},

publisher={Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola,},

place={Göteborg},

year={2012},

series={CTH-NT - Chalmers University of Technology, Nuclear Engineering, no: 256Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, no: 3384},

keywords={neutron noise, Green's function, Molten Salt Reactors, one-group theory, two-group theory, propagating perturbations},

note={84},

}

** RefWorks **

RT Dissertation/Thesis

SR Electronic

ID 157384

A1 Jonsson, Anders

T1 Neutronics in reactors with propagating perturbations

YR 2012

SN 978-91-7385-703-1

AB This thesis contains several studies of the properties of neutron noise, primarily in Molten Salt Reactors and other reactors with propagating perturbations. Both one- and two-group diffusion theory are employed to investigate the differences that arise from the movement of the fuel. Data corresponding to a thorium-fuelled thermal reactor is used to investigate the properties of a more realistic possible
realisation of an MSR system, as well as data corresponding to more traditional systems for contrast. Furthermore, the properties of the neutron noise from a vibrating absorber or fuel rod in a traditional reactor is investigated in a two-group, multi-region system.
For the MSR, the Green's functions and the dynamic adjoint functions are investigated in the general case of arbitrary fuel recirculation velocity and in the limiting case of infinite fuel velocity which permits simplified solutions both in the static and dynamic case. It is found that the amplitude of the induced noise is generally higher and the domain of the point kinetic behaviour valid up to higher frequencies than in a corresponding traditional system. This
is due to the differing behaviour of the delayed neutron precursors as compared to the traditional case.
The MSR equations are not self-adjoint and the adjoint equations and adjoint functions have to be constructed, which is also done here. Finally, the space-dependent
neutron noise, induced by propagating perturbations of the
absorption cross section is calculated. A number of interesting properties that are relevant to full size MSRs are found and interpreted. The results are consistent with those in traditional systems but the domains of various behaviour regimes (point kinetic, space dependent etc.) are shifted to higher frequencies or system sizes.

PB Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola,

T3 CTH-NT - Chalmers University of Technology, Nuclear Engineering, no: 256Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, no: 3384

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/157384.pdf

OL 30