SCALE Modeling of Selected Neutronics Test Problems within the OECD UAM LWR’s Benchmark

Table 3

Exercise I-1: PWR test case at HFP: energy integrated sensitivity coefficients of the ²³⁸U absorption cross-section with respect to different cross-section isotopes.

Nuclide	Reaction	Explicit	Implicit	Sensitivity
^16O	Total	3.00𝐸−02	1.19𝐸−02	4.19𝐸−02
^16O	Scattering	2.99𝐸−02	1.19𝐸−02	4.18𝐸−02
^16O	Elastic	2.99𝐸−02	1.19𝐸−02	4.18𝐸−02
^16O	n,n′	1.37𝐸−05	−1.95𝐸−08	1.37𝐸−05
^16O	n,2n	4.32𝐸−12	−2.24𝐸−17	4.32𝐸−12
^16O	n,γ	−8.21𝐸−07	1.00𝐸−08	−8.11𝐸−07
^16O	n,p	−1.90𝐸−07	−2.02𝐸−11	−1.90𝐸−07
^16O	n,d	−4.02𝐸−08	−1.07𝐸−12	−4.02𝐸−08
^16O	n,t	−5.75𝐸−13	−5.14𝐸−18	−5.75𝐸−13
^16O	n,alpha	1.12𝐸−04	2.69𝐸−08	1.12𝐸−04
^234U	Total	−4.27𝐸−05	2.05𝐸−06	−4.07𝐸−05
^234U	Scattering	−9.13𝐸−08	1.47𝐸−06	1.37𝐸−06
^234U	Elastic	−9.43𝐸−07	1.47𝐸−06	5.23𝐸−07
^234U	n,n′	8.50𝐸−07	3.27𝐸−10	8.50𝐸−07
^234U	n,2n	1.99𝐸−09	−1.12𝐸−13	1.99𝐸−09
^234U	Fission	4.15𝐸−08	4.34𝐸−09	4.58𝐸−08
^234U	n,γ	−4.27𝐸−05	5.83𝐸−07	−4.21𝐸−05
^234U	Nubar	4.36𝐸−08	—	4.36𝐸−08
^234U	Chi	−3.13𝐸−15	—	−3.13𝐸−15
^235U	Total	−1.01𝐸−01	3.36𝐸−03	−9.75𝐸−02
^235U	Scattering	1.08𝐸−03	8.97𝐸−04	1.97𝐸−03
^235U	Elastic	−9.45𝐸−05	8.96𝐸−04	8.01𝐸−04
^235U	n,n′	1.16𝐸−03	8.01𝐸−07	1.16𝐸−03
^235U	n,2n	1.38𝐸−05	−1.14𝐸−09	1.38𝐸−05
^235U	Fission	−7.56𝐸−02	1.39𝐸−03	−7.42𝐸−02
^235U	n,γ	−2.63𝐸−02	1.07𝐸−03	−2.53𝐸−02
^235U	Nubar	−2.75𝐸−04	—	−2.75𝐸−04
^235U	Chi	1.22𝐸−11	—	1.22𝐸−11
^238U	Total	7.85𝐸−01	−8.43𝐸−02	7.01𝐸−01
^238U	Scattering	3.25𝐸−02	−5.69𝐸−02	−2.44𝐸−02
^238U	Elastic	4.68𝐸−03	−5.69𝐸−02	−5.22𝐸−02
^238U	n,n′	2.75𝐸−02	8.91𝐸−06	2.75𝐸−02
^238U	n,2n	3.38𝐸−04	8.26𝐸−08	3.38𝐸−04
^238U	Fission	1.04𝐸−01	−3.16𝐸−07	1.04𝐸−01
^238U	n,γ	6.48𝐸−01	−2.74𝐸−02	6.21𝐸−01
^238U	Nubar	1.38𝐸−04	—	1.38𝐸−04
^238U	Chi	−1.12𝐸−12	—	−1.12𝐸−12