328
Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
Table A4.20 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 2-D-2 (DT acc.) (ρ pcm, exp = 855.7 ± 41.34 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 528.29 ± 9.04
511.67 ± 7.89
0.97699 ± 0.01798 1.12891 ± 0.02847
BF-3 #2 528.90 ± 8.16
525.47 ± 6.55
0.99300 ± 0.01691 1.13125 ± 0.02652
BF-3 #3 532.62 ± 3.41
524.58 ± 2.71
1.00291 ± 0.00762 1.03933 ± 0.01150
Fiber #1 551.62 ± 16.01 518.95 ± 15.28
1.05686 ± 0.03549 1.09990 ± 0.05433
Fiber #2 531.09 ± 6.56
535.64 ± 5.62
0.98490 ± 0.01442 1.03664 ± 0.02193
Fiber #4 538.75 ± 7.94
524.44 ± 7.70
1.00649 ± 0.01879 1.12482 ± 0.02905
Table A4.21 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 2-D-3 (DT acc.) (ρ pcm, exp = 855.7 ± 41.34 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 520.68 ± 14.35 497.98 ± 28.83
0.99970 ± 0.02902 1.10363 ± 0.04398
BF-3 #2 540.67 ± 13.47 513.51 ± 29.28
1.04942 ± 0.02822 1.20361 ± 0.04376
BF-3 #3 539.67 ± 5.94
503.11 ± 19.54
0.99637 ± 0.01220 1.05783 ± 0.01841
Fiber #1 603.37 ± 31.75 644.03 ± 59.61
1.00039 ± 0.05132 1.06198 ± 0.08348
Fiber #2 556.54 ± 12.45 550.18 ± 24.54
0.98282 ± 0.02267 1.08083 ± 0.03559
Fiber #4 526.96 ± 13.58 507.13 ± 36.75
0.98791 ± 0.02879 1.09278 ± 0.04359
Table A4.22 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-D-1 (DT acc.) (ρ pcm, MCNP = 1512.9 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 667.29 ± 12.95 626.20 ± 12.85
1.65862 ± 0.04122 1.95981 ± 0.06664
BF-3 #2 655.80 ± 14.14 679.36 ± 15.34
1.72801 ± 0.04526 1.92831 ± 0.07057
BF-3 #3 672.77 ± 5.39
664.35 ± 6.05
1.72456 ± 0.01725 1.90308 ± 0.02698
Fiber #1 673.89 ± 23.09 724.98 ± 38.84
1.60421 ± 0.06756 1.60381 ± 0.10284
Fiber #2 667.31 ± 5.59
661.07 ± 6.15
1.66194 ± 0.01797 1.94418 ± 0.02886
Fiber #3 668.11 ± 11.27 658.91 ± 11.96
1.42546 ± 0.03085 1.65991 ± 0.05085
Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
Table A4.20 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 2-D-2 (DT acc.) (ρ pcm, exp = 855.7 ± 41.34 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 528.29 ± 9.04
511.67 ± 7.89
0.97699 ± 0.01798 1.12891 ± 0.02847
BF-3 #2 528.90 ± 8.16
525.47 ± 6.55
0.99300 ± 0.01691 1.13125 ± 0.02652
BF-3 #3 532.62 ± 3.41
524.58 ± 2.71
1.00291 ± 0.00762 1.03933 ± 0.01150
Fiber #1 551.62 ± 16.01 518.95 ± 15.28
1.05686 ± 0.03549 1.09990 ± 0.05433
Fiber #2 531.09 ± 6.56
535.64 ± 5.62
0.98490 ± 0.01442 1.03664 ± 0.02193
Fiber #4 538.75 ± 7.94
524.44 ± 7.70
1.00649 ± 0.01879 1.12482 ± 0.02905
Table A4.21 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 2-D-3 (DT acc.) (ρ pcm, exp = 855.7 ± 41.34 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 520.68 ± 14.35 497.98 ± 28.83
0.99970 ± 0.02902 1.10363 ± 0.04398
BF-3 #2 540.67 ± 13.47 513.51 ± 29.28
1.04942 ± 0.02822 1.20361 ± 0.04376
BF-3 #3 539.67 ± 5.94
503.11 ± 19.54
0.99637 ± 0.01220 1.05783 ± 0.01841
Fiber #1 603.37 ± 31.75 644.03 ± 59.61
1.00039 ± 0.05132 1.06198 ± 0.08348
Fiber #2 556.54 ± 12.45 550.18 ± 24.54
0.98282 ± 0.02267 1.08083 ± 0.03559
Fiber #4 526.96 ± 13.58 507.13 ± 36.75
0.98791 ± 0.02879 1.09278 ± 0.04359
Table A4.22 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-D-1 (DT acc.) (ρ pcm, MCNP = 1512.9 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 667.29 ± 12.95 626.20 ± 12.85
1.65862 ± 0.04122 1.95981 ± 0.06664
BF-3 #2 655.80 ± 14.14 679.36 ± 15.34
1.72801 ± 0.04526 1.92831 ± 0.07057
BF-3 #3 672.77 ± 5.39
664.35 ± 6.05
1.72456 ± 0.01725 1.90308 ± 0.02698
Fiber #1 673.89 ± 23.09 724.98 ± 38.84
1.60421 ± 0.06756 1.60381 ± 0.10284
Fiber #2 667.31 ± 5.59
661.07 ± 6.15
1.66194 ± 0.01797 1.94418 ± 0.02886
Fiber #3 668.11 ± 11.27 658.91 ± 11.96
1.42546 ± 0.03085 1.65991 ± 0.05085