NEUTRONIC FLUCTUATIONS IN A NUCLEAR REACTOR HAVING CELLULAR STRUCTURE (in French)
Journal Article
·
· Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.)
OSTI ID:4707313
The method of noise-equivalent random excitation uses the analogies between the behavior of a reactor and that of certain common radio electric circuits. The fluctuations may then be calculated by introducing into the circuit a suitable noise source. This method was generalized and extended to the case of a reactor having a cellular structure, with delayed neutrons, and applied to fluctuations within a cell. It is thus shown that the fluctuations in a cell are the result of two terms: a rapidly evolving Poissonian noise, not related to the overall fluctuations; a slowly evolving noise, when the reactor is not too far from criticality, which is related to the overall fluctuations. The first term arises from rapid ordering of the system, during which time the cells come mutually into equilibrium. The second term is due to the coordinated evolution of all the cells, after the end of the first transitory phase. The method may also be applied to the case of an artificial random neutron source, electronically modulated. (auth)
- Research Organization:
- Universite, Paris
- NSA Number:
- NSA-17-019211
- OSTI ID:
- 4707313
- Journal Information:
- Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.), Journal Name: Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.) Vol. Vol: 23: Suppl. No. 12; ISSN JPAAA
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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