Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
327
Table A4.17 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 1-D-3 (DT acc.) (ρ pcm, exp = 1245.0 ± 41.7 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
–
–
BF-3 #2
–
–
BF-3 #3
715.18 ± 9.57
744.54 ± 8.70
Fiber #1
–
–
Fiber #2
724.51 ± 24.58
843.73 ± 139.74
Fiber #3
740.00 ± 26.794
977.05 ± 196.02
Table A4.18 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 1-D-4 (DT acc.) (ρ pcm, exp = 1245.0 ± 41.7 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
–
–
BF-3 #2
–
–
BF-3 #3
713.43 ± 2.80
708.85 ± 3.28
Fiber #1
–
–
Fiber #2
715.59 ± 6.03
730.10 ± 5.92
Fiber #3
705.76 ± 6.19
728.07 ± 6.86
Table A4.19 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods, ρ $ in dollar units by the area ratio method, and β eff / [s −1 ] by the α-fitting method (Ref.
[1])
Case 2-D-1 (DT acc.) (ρ pcm, MCNP = 855.7 ± 41.34 [pcm])
Detector α (PNS method) α (Feynman-α method) Extended area ρ $ [$] β eff / [ s −1 ]
BF-3 #1 294.78 ± 29.27
319.16 ± 71.63
0.02283 ± 0.00703
288.2 ± 93.3
BF-3 #2 226.96 ± 23.31
363.98 ± 75.69
0.01576 ± 0.00537
223.4 ± 79.5
BF-3 #3 258.58 ± 12.34
270.42 ± 13.87
0.01938 ± 0.00270
253.7 ± 37.3
Fiber #1 248.38 ± 39.04
–
0.02066 ± 0.00559
243.4 ± 72.1
Fiber #2 229.95 ± 14.51
268.82 ± 20.68
0.01998 ± 0.00320
225.4 ± 38.8
Fiber #3 273.99 ± 26.24
310.39 ± 42.98
0.02613 ± 0.00559
267.0 ± 62.6
MCNP6.1 with ENDF/B-VII.0: β eff = 829.0 [pcm], = 3.147E-05 (s), β eff / = 263.43 [s −1 ]
327
Table A4.17 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 1-D-3 (DT acc.) (ρ pcm, exp = 1245.0 ± 41.7 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
–
–
BF-3 #2
–
–
BF-3 #3
715.18 ± 9.57
744.54 ± 8.70
Fiber #1
–
–
Fiber #2
724.51 ± 24.58
843.73 ± 139.74
Fiber #3
740.00 ± 26.794
977.05 ± 196.02
Table A4.18 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 1-D-4 (DT acc.) (ρ pcm, exp = 1245.0 ± 41.7 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
–
–
BF-3 #2
–
–
BF-3 #3
713.43 ± 2.80
708.85 ± 3.28
Fiber #1
–
–
Fiber #2
715.59 ± 6.03
730.10 ± 5.92
Fiber #3
705.76 ± 6.19
728.07 ± 6.86
Table A4.19 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods, ρ $ in dollar units by the area ratio method, and β eff / [s −1 ] by the α-fitting method (Ref.
[1])
Case 2-D-1 (DT acc.) (ρ pcm, MCNP = 855.7 ± 41.34 [pcm])
Detector α (PNS method) α (Feynman-α method) Extended area ρ $ [$] β eff / [ s −1 ]
BF-3 #1 294.78 ± 29.27
319.16 ± 71.63
0.02283 ± 0.00703
288.2 ± 93.3
BF-3 #2 226.96 ± 23.31
363.98 ± 75.69
0.01576 ± 0.00537
223.4 ± 79.5
BF-3 #3 258.58 ± 12.34
270.42 ± 13.87
0.01938 ± 0.00270
253.7 ± 37.3
Fiber #1 248.38 ± 39.04
–
0.02066 ± 0.00559
243.4 ± 72.1
Fiber #2 229.95 ± 14.51
268.82 ± 20.68
0.01998 ± 0.00320
225.4 ± 38.8
Fiber #3 273.99 ± 26.24
310.39 ± 42.98
0.02613 ± 0.00559
267.0 ± 62.6
MCNP6.1 with ENDF/B-VII.0: β eff = 829.0 [pcm], = 3.147E-05 (s), β eff / = 263.43 [s −1 ]