Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
331
Table A4.29 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 5-D-3 (DT acc.) (ρ pcm, MCNP = 5466.8 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1518.10 ± 19.77 1441.77 ± 14.03
8.60725 ± 0.25150 11.74861 ± 0.45170
BF-3 #2 1546.67 ± 20.78 1420.56 ± 15.18
8.18430 ± 0.24169 11.21470 ± 0.44724
BF-3 #3 1563.35 ± 9.26 1523.67 ± 3.69
6.77913 ± 0.06357 7.54184 ± 0.11621
Fiber #1 –
1623.23 ± 44.80
–
–
Fiber #2 1568.87 ± 13.17 1501.30 ± 6.54
7.03293 ± 0.11596 8.79780 ± 0.21192
Fiber #4 1504.68 ± 21.32 1381.16 ± 18.64
19.45768 ± 1.86598 29.33747 ± 2.93363
Table A4.30 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 5-D-4 (DT acc.) (ρ pcm, MCNP = 5466.8 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1542.40 ± 26.77 1426.92 ± 26.99
7.48143 ± 0.27312 11.76062 ± 0.57855
BF-3 #2 1591.02 ±30.08 1367.56 ± 28.65
7.67026 ± 0.31138 12.84927 ± 0.70248
BF-3 #3 1551.31 ± 14.62 1513.58 ± 9.35
7.23510 ± 0.10362
9.32671 ± 0.21110
Fiber #1 1608.13 ± 81.13 1543.68 ± 77.62
8.70127 ± 0.71994 11.07538 ± 1.38422
Fiber #2 1557.72 ± 18.19 1493.76 ± 12.89
6.66444 ± 0.14187 10.45040 ± 0.32031
Fiber #4 1523.73 ± 40.46 1434.55 ± 37.42
9.42282 ± 0.55816 14.32678 ± 1.08688
Table A4.31 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 6-D-2 (DT acc.) (ρ pcm, MCNP = 8882.3 ± 5.9 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
–
1780.35 ± 54.79
BF-3 #2
–
2213.13 ± 97.65
BF-3 #3
–
2022.98 ± 16.88
Fiber #1
–
4324.24 ± 1007.21
Fiber #2
–
1703.06 ± 32.53
Fiber #4
–
1926.80 ± 172.55