Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
337
Table A4.48 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-F-4 (FFAG acc.) (ρ pcm, MCNP = 4257.9 ± 5.8 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
Fiber #1 1556.12 ± 8.80 1522.92 ± 3.54
4.81807 ± 0.03981 6.79508 ± 0.09479
Fiber #2 2146.82 ± 19.38 1879.17 ± 3.54
16.81220 ± 0.32995 28.02081 ± 0.81516
Fiber #3 1848.02 ± 13.31 1601.44 ± 7.06
15.06196 ± 0.23488 34.22104 ± 0.71953
BF-3 #1 1287.36 ± 9.06 1188.78 ± 5.19
3.71551 ± 0.04354 5.31464 ± 0.09603
BF-3 #2 1446.88 ± 8.65 1375.82 ± 5.29
5.00395 ± 0.05329 7.66140 ± 0.11927
BF-3 #3 1325.30 ± 9.67 1182.60 ± 5.59
3.61555 ± 0.03216 5.48823 ± 0.08118
Table A4.49 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 4-F-5 (FFAG acc.) (ρ pcm, MCNP = 16947.3 ± 6.2 [pcm])
Detector
PNS method
Feynman-α method
Area ρ $ [$]
Extended
area ρ $ [$]
Fiber #1
2562.00 ± 76.57
2848.42 ± 21.25
14.36405 ± 0.59092
14.36474 ±
0.59094
Fiber #2
–
2745.70 ± 27.44
–
–
Fiber #3
2911.88 ± 100.32
2686.22 ± 20.70
48.33320 ± 5.21077
80.00728
±12.21573
BF-3 #1
2277.16 ± 27.08
2022.44 ± 7.29
10.18877 ± 0.18311
15.18345 ±
0.54712
BF-3 #2
2580.40 ± 41.81
2313.12 ± 12.19
19.60222 ± 0.67824
35.40981 ±
2.04051
BF-3 #3
2643.02 ± 35.49
2212.25 ± 11.46
15.90766 ± 0.39806
30.82799 ±
1.43235
Table A4.50 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 5-F-1 (FFAG acc.) (ρ pcm, MCNP = 5466.8 ± 5.9 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $ [$]
BF-3 #1 1347.72 ± 7.55
1224.98 ± 3.24
4.2409 ± 0.0130
6.6210 ± 0.0557
BF-3 #2 1535.17 ± 3.86
1398.67 ± 4.98
6.4582 ± 0.0254 10.7421 ± 0.0638
BF-3 #3 1302.23 ± 9.671 1123.22 ± 3.32
3.6621 ± 0.0122
5.7880 ± 0.0607