Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
329
Table A4.23 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-1 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $
[$]
BF-3 #1
1056.02 ± 38.51 1113.92 ± 41.74
3.73361 ± 0.19036 4.78451 ± 0.34900
BF-3 #2
1119.68 ± 39.02 1064.70 ± 47.73
3.70243 ± 0.18643 5.17838 ± 0.37464
BF-3 #3
1076.31 ± 16.22 1078.63 ± 11.07
3.55740 ± 0.06986 4.26586 ± 0.12752
Fiber #1 1155.278 ± 157.26 1186.20 ± 144.92 –
–
Fiber #2 –
–
Fiber #4 –
–
Table A4.24 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-2 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1092.18 ± 19.15 999.68 ± 13.50
3.82788 ± 0.06968 5.00179 ± 0.14435
BF-3 #2 1082.50 ± 23.44 1013.01 ± 14.55
3.72918 ± 0.06925 4.51610 ± 0.14738
BF-3 #3 1076.16 ± 24.72 1024.44 ± 5.06
3.90435 ± 0.02899 4.31173 ± 0.11384
Fiber #1 1110.31 ± 56.56 986.93 ± 31.56
3.99660 ± 0.14054 4.59564 ± 0.32699
Fiber #2 1071.20 ± 17.88 993.30 ± 7.48
3.60796 ± 0.04005 4.24635 ± 0.09581
Fiber #4 1063.37 ± 22.56 –
3.85565 ± 0.07871 4.66042 ± 0.15531
Table A4.25 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-3 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1051.31 ± 10.10 1000.94 ± 6.79
3.60407 ± 0.05694 4.64020 ± 0.10113
BF-3 #2 1046.19 ± 10.80 1008.30 ± 6.44
3.77780 ± 0.06011 4.66594 ± 0.10417
BF-3 #3 1073.30 ± 5.42
1035.34 ± 2.38
3.76266 ± 0.02511 4.23217 ± 0.04311
Fiber #1 1069.91 ± 22.96 1049.00 ± 14.85
4.89473 ± 0.17728 5.05178 ± 0.25089
Fiber #2 1068.86 ± 6.59
1003.73 ± 3.41
3.61753 ± 0.03547 4.45911 ± 0.06205
Fiber #4 1065.15 ± 11.75 1000.72 ± 7.15
4.10600 ± 0.07930 5.12115 ± 0.13295
329
Table A4.23 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-1 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $
[$]
BF-3 #1
1056.02 ± 38.51 1113.92 ± 41.74
3.73361 ± 0.19036 4.78451 ± 0.34900
BF-3 #2
1119.68 ± 39.02 1064.70 ± 47.73
3.70243 ± 0.18643 5.17838 ± 0.37464
BF-3 #3
1076.31 ± 16.22 1078.63 ± 11.07
3.55740 ± 0.06986 4.26586 ± 0.12752
Fiber #1 1155.278 ± 157.26 1186.20 ± 144.92 –
–
Fiber #2 –
–
Fiber #4 –
–
Table A4.24 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-2 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1092.18 ± 19.15 999.68 ± 13.50
3.82788 ± 0.06968 5.00179 ± 0.14435
BF-3 #2 1082.50 ± 23.44 1013.01 ± 14.55
3.72918 ± 0.06925 4.51610 ± 0.14738
BF-3 #3 1076.16 ± 24.72 1024.44 ± 5.06
3.90435 ± 0.02899 4.31173 ± 0.11384
Fiber #1 1110.31 ± 56.56 986.93 ± 31.56
3.99660 ± 0.14054 4.59564 ± 0.32699
Fiber #2 1071.20 ± 17.88 993.30 ± 7.48
3.60796 ± 0.04005 4.24635 ± 0.09581
Fiber #4 1063.37 ± 22.56 –
3.85565 ± 0.07871 4.66042 ± 0.15531
Table A4.25 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-D-3 (DT acc.) (ρ pcm, MCNP = 3111.6 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1051.31 ± 10.10 1000.94 ± 6.79
3.60407 ± 0.05694 4.64020 ± 0.10113
BF-3 #2 1046.19 ± 10.80 1008.30 ± 6.44
3.77780 ± 0.06011 4.66594 ± 0.10417
BF-3 #3 1073.30 ± 5.42
1035.34 ± 2.38
3.76266 ± 0.02511 4.23217 ± 0.04311
Fiber #1 1069.91 ± 22.96 1049.00 ± 14.85
4.89473 ± 0.17728 5.05178 ± 0.25089
Fiber #2 1068.86 ± 6.59
1003.73 ± 3.41
3.61753 ± 0.03547 4.45911 ± 0.06205
Fiber #4 1065.15 ± 11.75 1000.72 ± 7.15
4.10600 ± 0.07930 5.12115 ± 0.13295