open access

https://hdl.handle.net/2115/55139

Photon transport effect on intra-subassembly thermal power distribution in fast reactor

英語

Photon transport

2014-03

Pergamon-elsevier science ltd

Annals of nuclear energy

65

41-46

In order to accurately predict intra-subassembly thermal power distribution in a fast reactor, neutron and photon transport calculations are carried out with a multi-purpose reactor physics calculation code system CBZ. All the fission fragment nuclide are treated explicitly during fuel depletion, and irradiation time-dependent energy spectra of delayed fission gamma-rays emitted from all the fission fragment nuclides are precisely simulated. Time-dependent delayed beta-ray emission and transmutations of fission fragment nuclide by neutron-nuclide reactions are also taken into account. A fuel subassembly model of Japanese prototype fast reactor Monju is used for numerical calculations, and their two-dimensional geometric feature is precisely modeled by a ray-tracing-based collision probability method implemented in CBZ. When the photon transport is considered, total thermal powers in fissile material regions are reduced by about 1.5% except at the beginning of fuel depletion. (C) 2013 Elsevier Ltd. All rights reserved.

学術雑誌論文

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0306-4549