Fission product model for BWR lattice calculation code.
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概要
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A benchmark calculation of full fission product was performed for thermal reactor application using an isotope transmutation code DCHAIN based on 185 nuclides with revised nuclear data library. The fission product model for BWR lattice calculation was studied and tested with the benchmark results, and a model containing 45 explicit nuclides and one pseudo nuclide was selected as a reasonably best model to predict the burnup reactivity with high precision for practically all types of fuel and reactor operating conditions. The evaluated thermal cross section and resonance integral for the pseudo nuclide are σ<SUB>2, 200</SUB>=2.6 b and <I>RI</I>=10.6 b, combined with the pseudo fission yield values of 1.3898, 1.3233, 1.3675 and 1.2773 for fissions from <SUP>235</SUP>U, <SUP>238</SUP>U, <SUP>239</SUP>PU and <SUP>241</SUP>Pu, respectively. The present results are believed as equally applicable to PWR lattice calculation.