Analysis of Cavity Effect on Space- and Time-Dependent Fast and Thermal Neutron Energy Spectra
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概要
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The effects of the presence of a central cavity on the space- and time-dependent neutron energy spectra in both thermal and fast neutron systems are analyzed theoretically with use made of the multi-group one-dimensional time-dependent S<SUB><I>n</I></SUB> method. The thermal neutron field is also analyzed for the case of a fundamental time eigenvalue problem with the time-dependent P<SUB>1</SUB> approximation. The cavity radius is variable, and the system radius for graphite is 120 cm and for the other materials 7 cm.<BR>From the analysis of the time-dependent S<SUB><I>n</I></SUB>, calculations in the non-multiplying systems of polythene, light water and graphite, cavity heating is the dominant effect for the slowing-down spectrum in the initial period following fast neutron burst, and when the slowing-down spectrum comes into the thermal energy region, cavity heating shifts to cavity cooling. In the multiplying system of <SUP>235</SUP>U, cavity cooling also takes place as the spectrum approaches equilibrium after the fast neutron burst is injected.<BR>The mechanism of cavity cooling is explained analytically for the case of thermal neutron field to illustrate its physical aspects, using the time-dependent P<SUB>1</SUB> approximation. An example is given for the case of light water.
- 一般社団法人 日本原子力学会の論文
著者
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Ozawa Yasutomo
Department Of Nuclear Engineering Faculty Of Engineering Hokkaido University
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Narita Masakuni
Department Of Nuclear Engineering Faculty Of Engineering Hokkaido University
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KUDO Katsuhisa
Quantum Technology Division, Electrotechnical Laboratory
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