Reactor Kinetics, Dynamic Response, and Neutron Noise in Molten Salt Reactors
Journal article, 2011

The dynamic space- and frequency dependent response of a Molten Salt Reactor (MSR) to stationary perturbations is investigated in a simple analytical model. The Green's function of the system is investigated in the general case of arbitrary fuel recirculation velocity and in the limiting case of infinite fuel velocity which permits closed form 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 equation and adjoint function 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.

adjoint equation

Molten Salt Reactors

neutron noise

Green's function

propagating perturbation

Author

Imre Pazsit

Chalmers, Applied Physics, Nuclear Engineering

Anders Jonsson

Chalmers, Applied Physics, Nuclear Engineering

Nuclear Science and Engineering

0029-5639 (ISSN)

Vol. 167 61-76

Subject Categories

Other Engineering and Technologies not elsewhere specified

Other Physics Topics

More information

Created

10/7/2017