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- W2001181972 abstract "The methods normally used in reactor physics calculations either ignore altogether the spatial dependence of the thermal spectrum in a lattice cell or grossly over-simplify it. This approach is not satisfactory for interpreting experiments and it is dubious for design work on reactors containing two moderators at widely differing temperatures such, for example, as the heavy water-moderated light water-cooled SGHW. The most obvious method of studying the spatial variation of thermal spectrum is to use a multi-group transport code with no restrictions on the energy transfer matrix. The Carlson SNG programme is suitable for this work and the first part of the paper describes how it has been used, together with the results which have been obtained on various reactor systems. Brief reference is made to the Winfrith DSN programme which is now coming into use as a replacement for SNG. This method is laborious and expensive in machine time and a simple method known as Spectrox has been developed in parallel with this work. the spectrox method is based on a collision probability treatment of the flux in the fuel and it leads to a pair of simultaneous energy-dependent equations which determine the mean flux in the fuel and in the moderator. The second part of the paper describes the theory of this method, the computer programmes that have been written to exploit it and some results that have been obtained with it. It appears to give adequate accuracy for the thermal spectrum in normal systems." @default.
- W2001181972 created "2016-06-24" @default.
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- W2001181972 date "1963-09-01" @default.
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- W2001181972 title "The ‘spectrox’ method for thermal spectra in lattice cells" @default.
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- W2001181972 doi "https://doi.org/10.1016/0368-3230(63)90078-8" @default.
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