Equilibrium state core calculations for an SCW-SMR concept using the Apros-SPNDYN coupled code system

Open Access

Table A.5.

The coefficients of the polynomial functions obtained as the result of the parametrisation of the group constants for the fast neutron energy group for the fuel assemblies in Case B – 7.8 wt.% enriched fuel assemblies.

Fast group
Coefficients	$Σ_{a} [\frac{1}{cm}]$ $\mathrm{\Sigma}_{a}\,\left[\frac{1}{\mathrm{cm}}\right]$	D [cm]	$κ Σ_{f} [\frac{MeV}{cm}]$ ${\kappa}\mathrm{\Sigma}_{f}\,\left[\frac{\mathrm{MeV}}{\mathrm{cm}}\right]$	$υ Σ_{f} [\frac{1}{cm}]$ ${\upsilon}\mathrm{\Sigma}_{f}\,\left[\frac{1}{\mathrm{cm}}\right]$	$Σ_{s, 1 \to 2} [\frac{1}{cm}]$ $\mathrm{\Sigma}_{s,1\to 2}\,\left[\frac{1}{\mathrm{cm}}\right]$
a	3.19294E−03	1.42341E+00	3.95539E−01	4.96120E−03	3.53859E−02
b	4.83883E−07	−1.01974E−05	5.61223E−06	6.87858E−08	−1.35393E−07
c	−1.20522E−10	4.65966E−09	−2.07790E−09	−2.52826E−11	1.52265E−11
d	8.69443E−06	−9.37098E−04	4.08680E−04	4.98091E−06	−1.13996E−05
e	−6.11990E−09	6.64729E−07	−2.88219E−07	−3.51300E−09	7.89208E−09
f	−3.19423E−07	1.42045E−04	−3.05872E−05	−3.88055E−07	−4.09816E−06
g	−8.14190E−08	7.49952E−04	−4.09505E−05	−6.06333E−07	−2.94761E−05
h	1.45757E−03	−3.16760E−01	7.75786E−02	9.60065E−04	8.44774E−03

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