|Author||Doshi, J. B. ♦ Grossman, L. M.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||GENERAL STUDIES OF NUCLEAR REACTORS ♦ SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ♦ LMFBR TYPE REACTORS ♦ LOSS OF FLOW ♦ REACTIVITY INSERTIONS ♦ MATHEMATICAL MODELS ♦ REACTOR KINETICS ♦ SPATIAL DISTRIBUTION ♦ TIME DEPENDENCE ♦ VOID FRACTION ♦ ACCIDENTS ♦ BREEDER REACTORS ♦ DISTRIBUTION ♦ EPITHERMAL REACTORS ♦ FAST REACTORS ♦ FBR TYPE REACTORS ♦ KINETICS ♦ LIQUID METAL COOLED REACTORS ♦ REACTIVITY ♦ REACTOR ACCIDENTS ♦ REACTORS ♦ Nuclear Reactor Technology- Reactor Safety ♦ Power Reactors, Breeding|
|Abstract||A method of analysis is developed for nuclear reactor accident initiating events that are localized in space. The method is based on a flux factorization technique, accounting for the flux shape changes taking place near the region of perturbation. In the steady state, the neutron shape functions are expanded in a series of eigenfunctions of the steady-state group removal operator. During the unsteady state, the time-dependent group shape functions are expanded in a series of the same stationary eigenfunctions with time-dependent Fourier coefficients. An auxiliary function is added to this expansion to take account of the spatial variation of the spectral hardening of neutrons in the immediate vicinity of the disturbed region. From the resulting representation of the group shape functions, the equations to be satisfied by the time-dependent Fourier coefficients and the time-dependent auxiliary shape function due to the disturbed region are developed consistently. A typical large (1000-MW(e)) liquid-metal fast breeder reactor with two radial core zones of different enrichments is analyzed by the above method. The transient initiating perturbation is taken to be a specified rate of coolant voiding from a single subassembly in the reactor core. The results show a strong dependence of the reactivity added on the radial location of the voiding perturbation and on the rate of voiding.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Nucl. Sci. Eng.|
|Organization||Univ. of California, Berkeley|
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