Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
275
Table A2.20 Measured prompt neutron decay constants α [s −1 ] deduced by least-squared fitting
in the Feynman-α method (Ref. [1])
Neutron decay constants α [s −1 ]
Case
Fiber #1
Fiber #2
Fiber #3
Case II-1
400.6 ± 9.2
367.1 ± 5.8
554.0 ± 16.8
Case II-2
498.1 ± 4.6
463.5 ± 4.0
700.0 ± 6.7
Case II-3
654.5 ± 2.4
620.0 ± 1.8
877.3 ± 4.8
Case II-4
814.6 ± 5.8
822.0 ± 5.3
1029.0 ± 11.7
Case II-5
1365.1 ± 9.1
1400.0 ± 7.4
1669.1 ± 16.9
Case II-6
1556.7 ± 12.8
1636.1 ± 9.9
1917.4 ± 21.9
Table A2.21 Measured subcriticality [pcm] deduced by the Feynman-α (Noise) method (Ref. [1])
Subcriticality ρ [pcm] (by Noise method)
Case
β eff [pcm]
Reference [pcm]
Fiber #1
Fiber #2
Fiber #3
Case II-1
785 ± 4
1160 ± 5
1491 ± 57
1283 ± 36
2445 ± 105
Case II-2
785 ± 4
1684 ± 5
2024 ± 28
1814 ± 24
3250 ± 41
Case II-3
783 ± 5
2483 ± 6
2881 ± 15
2677 ± 11
4203 ± 29
Case II-4
788 ± 5
4812 ± 6
4336 ± 38
4384 ± 35
5740 ± 77
Case II-5
816 ± 5
9895 ± 6
8087 ± 61
8316 ± 50
10110 ± 113
Case II-6
806 ± 5
11556 ± 6
9633 ± 88
10175 ± 68
12096 ± 150
(β eff : MCNP6.1 with JENDL-4.0)
A2.3 Reaction Rates
A2.3.1 Core Configurations
See (Figs. A2.18 and A2.19).