266
Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
Table A2.11 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 ]
Target
BF 3 #1 in (10, U)
BF 3 #2 in (15, X)
Optical fiber
Case I-1
W
632.5 ± 7.1
665.4 ± 12.5
636.6 ± 10.8
W–Be
641.8 ± 21.2
683.0 ± 13.5
705.6 ± 11.8
Pb–Bi
616.2 ± 30.4
650.7 ± 26.8
714.2 ± 19.4
Case I-2
W
878.7 ± 22.2
869.1 ± 28.2
1089.8 ± 60.2
W–Be
874.7 ± 12.6
912.8 ± 23.7
1073.4 ± 60.4
Pb–Bi
885.0 ± 25.3
898.5 ± 36.3
970.2 ± 62.6
Case I-3
W
1086.4 ± 21.6
1103.1 ± 26.8
1407.5 ± 57.1
W–Be
1094.3 ± 11.8
1159.6 ± 16.4
1296.0 ± 18.6
Pb–Bi
1124.8 ± 13.9
1132.8 ± 23.4
1308.5 ± 19.5
Case I-4
W
889.0 ± 11.6
941.8 ± 20.5
1072.8 ± 23.8
W–Be
880.1 ± 12.8
975.5 ± 35.0
999.7 ± 11.4
Pb–Bi
900.0 ± 17.5
931.1 ± 10.5
1021.5 ± 23.3
Case I-5
W
1487.9 ± 48.9
1451.6 ± 35.4
1965.8 ± 91.7
W–Be
1456.5 ± 18.8
1575.3 ± 28.5
1746.6 ± 23.2
Pb–Bi
1390.4 ± 95.4
1431.6 ± 96.1
1682.6 ± 142.9
Table A2.12 Measured subcriticality [pcm] deduced by the Feynman-α method (Ref. [1])
Subcriticality ρ [pcm] (by Feynman-α method)
Target
BF 3 #1 in (10, U)
BF 3 #2 in (15, X)
Optical fiber
Case I-1 (Reference: ρ exp = 1360 pcm)
W
1122 ± 25
1515 ± 40
1406 ± 35
W–Be
1151 ± 66
1581 ± 43
1667 ± 38
Pb–Bi
1073 ± 94
1459 ± 83
1699 ± 61
Case I-2 (Reference: ρ exp = 2165 pcm)
W
1873 ± 69
2285 ± 87
3119 ± 184
W–Be
1861 ± 41
2450 ± 74
3057 ± 185
Pb–Bi
1892 ± 78
2396± 112
2667 ± 191
Case I-3 (Reference: ρ exp = 2900 pcm)
W
2507 ± 67
3169 ± 83
4320 ± 175
W–Be
2531 ± 39
3383 ± 52
3898 ± 59
(continued)
Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
Table A2.11 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 ]
Target
BF 3 #1 in (10, U)
BF 3 #2 in (15, X)
Optical fiber
Case I-1
W
632.5 ± 7.1
665.4 ± 12.5
636.6 ± 10.8
W–Be
641.8 ± 21.2
683.0 ± 13.5
705.6 ± 11.8
Pb–Bi
616.2 ± 30.4
650.7 ± 26.8
714.2 ± 19.4
Case I-2
W
878.7 ± 22.2
869.1 ± 28.2
1089.8 ± 60.2
W–Be
874.7 ± 12.6
912.8 ± 23.7
1073.4 ± 60.4
Pb–Bi
885.0 ± 25.3
898.5 ± 36.3
970.2 ± 62.6
Case I-3
W
1086.4 ± 21.6
1103.1 ± 26.8
1407.5 ± 57.1
W–Be
1094.3 ± 11.8
1159.6 ± 16.4
1296.0 ± 18.6
Pb–Bi
1124.8 ± 13.9
1132.8 ± 23.4
1308.5 ± 19.5
Case I-4
W
889.0 ± 11.6
941.8 ± 20.5
1072.8 ± 23.8
W–Be
880.1 ± 12.8
975.5 ± 35.0
999.7 ± 11.4
Pb–Bi
900.0 ± 17.5
931.1 ± 10.5
1021.5 ± 23.3
Case I-5
W
1487.9 ± 48.9
1451.6 ± 35.4
1965.8 ± 91.7
W–Be
1456.5 ± 18.8
1575.3 ± 28.5
1746.6 ± 23.2
Pb–Bi
1390.4 ± 95.4
1431.6 ± 96.1
1682.6 ± 142.9
Table A2.12 Measured subcriticality [pcm] deduced by the Feynman-α method (Ref. [1])
Subcriticality ρ [pcm] (by Feynman-α method)
Target
BF 3 #1 in (10, U)
BF 3 #2 in (15, X)
Optical fiber
Case I-1 (Reference: ρ exp = 1360 pcm)
W
1122 ± 25
1515 ± 40
1406 ± 35
W–Be
1151 ± 66
1581 ± 43
1667 ± 38
Pb–Bi
1073 ± 94
1459 ± 83
1699 ± 61
Case I-2 (Reference: ρ exp = 2165 pcm)
W
1873 ± 69
2285 ± 87
3119 ± 184
W–Be
1861 ± 41
2450 ± 74
3057 ± 185
Pb–Bi
1892 ± 78
2396± 112
2667 ± 191
Case I-3 (Reference: ρ exp = 2900 pcm)
W
2507 ± 67
3169 ± 83
4320 ± 175
W–Be
2531 ± 39
3383 ± 52
3898 ± 59
(continued)