Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
335
Table A4.41 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-2 (FFAG acc.) (ρ pcm, MCNP = 2422.6 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1035.20 ± 3.73
1020.68 ± 2.66
2.84329 ± 0.01322 3.56877 ± 0.75391
Fiber #2 –
1303.54 ± 11.94
–
–
Fiber #3 1217.71 ± 10.58 1113.52 ± 3.77
9.07361 ± 0.07213 13.14405 ± 3.65436
BF-3 #1 965.21 ± 15.18
851.50 ± 2.79
2.31917 ± 0.01621 1.54458 ± 0.61125
BF-3 #2 985.52 ± 18.71
934.66 ± 3.39
2.84057 ± 0.02191 2.52729 ± 1.26345
BF-3 #3 968.37 ± 15.18
823.79 ± 2.83
2.19004 ± 0.01526 1.69662 ± 0.61436
Table A4.42 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-3 (FFAG acc.) (ρ pcm, MCNP = 2714.6 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1153.96 ± 5.91 1132.32 ± 3.60
3.16221 ± 0.02246 4.35512 ± 2.11887
Fiber #2 –
1397.59 ± 5.49
–
–
Fiber #3 1353.14 ± 11.60 1215.37 ± 4.95
10.10259 ± 0.12587 31.62532 ±11.28040
BF-3 #1 1090.15 ± 21.82 953.38 ± 3.41
2.59421 ± 0.01949 4.31016 ± 0.34241
BF-3 #2 1118.92 ± 30.49 1057.83 ± 4.58
3.21619 ± 0.03015 4.63895 ± 0.50563
BF-3 #3 1055.02 ± 18.26 904.09 ± 3.15
2.48810 ± 0.01875 3.98336 ± 0.27902
Table A4.43 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-4 (FFAG acc.) (ρ pcm, MCNP = 2884.1 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1222.67 ± 8.94 1207.66 ± 5.27
3.23913 ± 0.03420 3.89288 ± 0.06664
Fiber #2 –
1490.87 ± 8.31
–
–
Fiber #3 1454.23 ± 13.44 1285.38 ± 6.34
10.72912 ± 0.20364 20.01503 ± 0.48055
BF-3 #1 1125.12 ± 21.17 1012.46 ± 3.40
2.74824 ± 0.01767 4.25301 ± 0.32784
BF-3 #2 1199.67 ± 26.34 1118.91 ± 4.63
3.40634 ± 0.02744 5.30669 ± 0.51697
BF-3 #3 1139.12 ± 23.54 980.84 ± 3.04
2.63522 ± 0.01704 4.32898 ± 0.36156
Table A4.44 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-5 (FFAG acc.) (ρ pcm, MCNP = 14785.8 ± 6.1 [pcm])
Detector PNS method
Feynman-α
method
Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 2232.48 ± 27.73 2019.60 ± 13.07
9.18032 ± 0.18320 17.95485 ± 0.66393
BF-3 #2 2410.92 ± 49.15 2164.72 ± 29.34 13.76546 ± 0.64883 30.58625 ± 2.22143
BF-3 #3 2475.27 ± 39.45 2139.70 ± 18.28 12.30041 ± 0.40731 28.35497 ± 1.56607
335
Table A4.41 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-2 (FFAG acc.) (ρ pcm, MCNP = 2422.6 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1035.20 ± 3.73
1020.68 ± 2.66
2.84329 ± 0.01322 3.56877 ± 0.75391
Fiber #2 –
1303.54 ± 11.94
–
–
Fiber #3 1217.71 ± 10.58 1113.52 ± 3.77
9.07361 ± 0.07213 13.14405 ± 3.65436
BF-3 #1 965.21 ± 15.18
851.50 ± 2.79
2.31917 ± 0.01621 1.54458 ± 0.61125
BF-3 #2 985.52 ± 18.71
934.66 ± 3.39
2.84057 ± 0.02191 2.52729 ± 1.26345
BF-3 #3 968.37 ± 15.18
823.79 ± 2.83
2.19004 ± 0.01526 1.69662 ± 0.61436
Table A4.42 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-3 (FFAG acc.) (ρ pcm, MCNP = 2714.6 ± 5.7 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1153.96 ± 5.91 1132.32 ± 3.60
3.16221 ± 0.02246 4.35512 ± 2.11887
Fiber #2 –
1397.59 ± 5.49
–
–
Fiber #3 1353.14 ± 11.60 1215.37 ± 4.95
10.10259 ± 0.12587 31.62532 ±11.28040
BF-3 #1 1090.15 ± 21.82 953.38 ± 3.41
2.59421 ± 0.01949 4.31016 ± 0.34241
BF-3 #2 1118.92 ± 30.49 1057.83 ± 4.58
3.21619 ± 0.03015 4.63895 ± 0.50563
BF-3 #3 1055.02 ± 18.26 904.09 ± 3.15
2.48810 ± 0.01875 3.98336 ± 0.27902
Table A4.43 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-4 (FFAG acc.) (ρ pcm, MCNP = 2884.1 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1222.67 ± 8.94 1207.66 ± 5.27
3.23913 ± 0.03420 3.89288 ± 0.06664
Fiber #2 –
1490.87 ± 8.31
–
–
Fiber #3 1454.23 ± 13.44 1285.38 ± 6.34
10.72912 ± 0.20364 20.01503 ± 0.48055
BF-3 #1 1125.12 ± 21.17 1012.46 ± 3.40
2.74824 ± 0.01767 4.25301 ± 0.32784
BF-3 #2 1199.67 ± 26.34 1118.91 ± 4.63
3.40634 ± 0.02744 5.30669 ± 0.51697
BF-3 #3 1139.12 ± 23.54 980.84 ± 3.04
2.63522 ± 0.01704 4.32898 ± 0.36156
Table A4.44 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 3-F-5 (FFAG acc.) (ρ pcm, MCNP = 14785.8 ± 6.1 [pcm])
Detector PNS method
Feynman-α
method
Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 2232.48 ± 27.73 2019.60 ± 13.07
9.18032 ± 0.18320 17.95485 ± 0.66393
BF-3 #2 2410.92 ± 49.15 2164.72 ± 29.34 13.76546 ± 0.64883 30.58625 ± 2.22143
BF-3 #3 2475.27 ± 39.45 2139.70 ± 18.28 12.30041 ± 0.40731 28.35497 ± 1.56607