332
Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
Table A4.32 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 6-D-3 (DT acc.) (ρ pcm, MCNP = 8882.3 ± 5.9 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $
[$]
BF-3 #1 2024.25 ± 61.49
1584.52 ± 128.30
14.92700 ± 1.82496 30.69158 ±
4.60981
BF-3 #2 2144.03 ± 84.83
2023.53 ± 174.81
15.44242 ± 2.04033 32.21389 ±
5.23709
BF-3 #3 2144.99 ± 34.08
1963.84 ± 32.34
12.80783 ± 0.55046 18.95650 ±
1.09303
Fiber #1 1998.46 ± 425.92 1829.06 ± 488.42
12.40719 ± 3.87931 5.56483 ±
2.31382
Fiber #2 1985.47 ± 44.19
1814.45 ± 82.31
12.33320 ± 0.93682 22.10653 ±
2.14379
Fiber #4 2064.13 ± 102.76 2480.72 ± 333.99
16.94444 ± 4.12772 32.17342 ±
8.66792
Table A4.33 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 6-D-5 (DT acc.) (ρ pcm, MCNP = 8882.3 ± 5.9 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
2670.27 ± 125.23
1913.15 ± 270.08
BF-3 #2
3033.82 ± 242.75
3932.08 ± 634.72
BF-3 #3
3067.22 ± 118.67
2419.25 ± 83.22
Fiber #1
2560.30 ± 632.22
5538.75 ± 1156.03
Fiber #2
3148.90 ± 297.81
2914.43 ± 602.96
Fiber #4
2912.04 ± 453.49
5565.46 ± 3640.91
Table A4.34 Effective multiplication factor in Cases II-1 through II-6 (Ref. [1])
Case
k eff (MCNP6.1 with JENDL-4.0)
Case 1-D (1-F)
–
Case 2-D (2-F); HEU 3000
0.99817 ± 0.00004
Case 3-D (3-F); HEU 2760
0.98400 ± 0.00004
Case 4-D (4-F); HEU 2520
0.96876 ± 0.00004
Case 5-D (5-F); HEU 2280
0.94715 ± 0.00004
Case 6-D (6-F); HEU 2040
0.91747 ± 0.00004
Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
Table A4.32 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods and subcriticality [$] in dollar units (Ref. [1])
Case 6-D-3 (DT acc.) (ρ pcm, MCNP = 8882.3 ± 5.9 [pcm])
Detector PNS method
Feynman-α method Area ρ $ [$]
Extended area ρ $
[$]
BF-3 #1 2024.25 ± 61.49
1584.52 ± 128.30
14.92700 ± 1.82496 30.69158 ±
4.60981
BF-3 #2 2144.03 ± 84.83
2023.53 ± 174.81
15.44242 ± 2.04033 32.21389 ±
5.23709
BF-3 #3 2144.99 ± 34.08
1963.84 ± 32.34
12.80783 ± 0.55046 18.95650 ±
1.09303
Fiber #1 1998.46 ± 425.92 1829.06 ± 488.42
12.40719 ± 3.87931 5.56483 ±
2.31382
Fiber #2 1985.47 ± 44.19
1814.45 ± 82.31
12.33320 ± 0.93682 22.10653 ±
2.14379
Fiber #4 2064.13 ± 102.76 2480.72 ± 333.99
16.94444 ± 4.12772 32.17342 ±
8.66792
Table A4.33 Measured prompt neutron decay constants α [s −1 ] deduced by PNS and Feynman-α
methods (Ref. [1])
Case 6-D-5 (DT acc.) (ρ pcm, MCNP = 8882.3 ± 5.9 [pcm])
Detector
PNS method
Feynman-α method
BF-3 #1
2670.27 ± 125.23
1913.15 ± 270.08
BF-3 #2
3033.82 ± 242.75
3932.08 ± 634.72
BF-3 #3
3067.22 ± 118.67
2419.25 ± 83.22
Fiber #1
2560.30 ± 632.22
5538.75 ± 1156.03
Fiber #2
3148.90 ± 297.81
2914.43 ± 602.96
Fiber #4
2912.04 ± 453.49
5565.46 ± 3640.91
Table A4.34 Effective multiplication factor in Cases II-1 through II-6 (Ref. [1])
Case
k eff (MCNP6.1 with JENDL-4.0)
Case 1-D (1-F)
–
Case 2-D (2-F); HEU 3000
0.99817 ± 0.00004
Case 3-D (3-F); HEU 2760
0.98400 ± 0.00004
Case 4-D (4-F); HEU 2520
0.96876 ± 0.00004
Case 5-D (5-F); HEU 2280
0.94715 ± 0.00004
Case 6-D (6-F); HEU 2040
0.91747 ± 0.00004