Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
267
Table A2.12 (continued)
Subcriticality ρ [pcm] (by Feynman-α method)
Target
BF 3 #1 in (10, U)
BF 3 #2 in (15, X)
Optical fiber
Pb–Bi
2624 ± 45
3282 ± 73
3946 ± 61
Case I-4 (Reference: ρ MCNPX = 2773 pcm)
W
1905 ± 38
2560 ± 64
3055 ± 74
W–Be
1877 ± 41
2884 ± 108
2778 ± 37
Pb–Bi
1938 ± 55
2519 ± 35
2861 ± 72
Case I-5 (Reference: ρ MCNPX = 4902 pcm)
W
3731 ± 150
4486 ± 109
6430 ± 280
W–Be
3634 ± 60
4954 ± 86
5601 ± 73
Pb–Bi
3434 ± 291
4411 ± 294
5360 ± 436
(β eff = 807 pcm; = 3.050E-05 s by MCNP6.1 with JENDL-4.0)
Fig. A2.9 Experimental
results of time evolution on
prompt and delayed neutron
behaviors at position (10, U)
of BF 3 detector #1 in Case
I-3 (Refs. [1–2])
0
0.01
0.02
0.03
0.04
0.05
10
1
10
2
10
3
10
4
10
5
Time evolution [s]
Countin rate [1/s]
ρ exp = 2900 pcm (BF 3 #1)
W target
W-Be target
Pb-Bi target
Fig. A2.10 Experimental
results of time evolution on
prompt and delayed neutron
behaviors at position (10, U)
of BF 3 detector #1 in Case
I-5 (Refs. [1–2])
0
0.01
0.02
0.03
0.04
0.05
10
1
10
2
10
3
10
4
10
5
Time evolution [s]
Countin rate [1/s]
ρ MCNPX = 4902 pcm (BF 3 #1)
W target
W-Be target
Pb-Bi target