کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11007326 1521075 2018 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Perturbation scheme for estimating uncertainties in thermal scattering cross sections of water
ترجمه فارسی عنوان
طرح اختلال برای تخمین عدم قطعیت در مقاطع پراکندگی حرارتی آب
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Neutron-moderator scattering interactions in the thermal energy range are often treated with specialised cross section data derived from the Thermal Scattering Law S(α,β). This scattering law is calculated based on theoretical and experimental models that describe the structure and dynamics of the principle moderator molecule. In this work, a perturbation scheme based on the Total Monte Carlo method is described and the uncertainties of the parameters used to calculate S(α,β) for H in H2O and D and O in D2O from the ENDF/B-VIII.0 library were estimated and propagated through to the cross sections and to an integral criticality scenario in the OPAL Reactor, Sydney Australia, using the transport code Serpent. The calculated uncertainties in the total cross sections are in reasonable agreement with experimental data and provide a basis for future model refinement; uncertainties in several parameters used in the LEAPR of NJOY were identified as critical to specific energy regions and behaviours of the total cross sections. The effect on criticality of these uncertainties was found to be 48 pcm and 41 pcm for H2O and D2O, respectively, within the OPAL Reactor during a low-power configuration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Nuclear Energy - Volume 121, November 2018, Pages 232-249
نویسندگان
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