262
Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
Table A2.3 Measured reaction rates [s −1 cm −3 ] and Cd ratio (Ref. [1])
W target
W–Be target
Pb–Bi target
Au foil (Bare)
(3.017 ± 0.734)
E+06
(3.330 ± 0.026)
E+06
(2.070 ± 0.158)
E+06
Au foil (Cd)
(2.240 ± 0.546)
E+06
(2.406 ± 0.020)
E+06
(1.497 ± 0.116)
E+06
115 In(n, n ) 115m In
(2.176 ± 0.078)
E+05
(1.777 ± 0.015)
E+05
(1.578 ± 0.051)
E+05
27 Al(n, n+3p) 24 Na
(1.036 ± 0.062)
E+06
(1.185 ± 0.080)
E+06
(0.928 ± 0.062)
E+06
Cd ratio
1.35 ± 0.27
1.39 ± 0.02
1.38 ± 0.28
Table A2.4 Core condition
of indium reaction rate
distribution in subcritical
state (Ref. [1])
Case
Number of fuel
rods
Rod insertion
Case I-3 (refer to
Table A2.7)
25
C1, C2, A3, S4, S5,
S6
Table A2.5 Specification of
measurement of reaction rate
distribution (Ref. [1])
Reaction
Location
Foil/Wire
115 In(n, n ) 115m In
Target (refer to
Fig. A1.10)
10 × 10 × 1 mm
115 In(n, γ) 116 In
Core (refer to
Fig. A1.11)
1 mm diameter, 800
mm long
Table A2.6 Dimensions of
targets (W, W–Be and Pb–Bi)
(Ref. [1])
Target
Diameter (mm)
Thickness (mm)
W
50
12.0
W–Be
50
W: 12.0; Be: 10.0
Pb–Bi
50
Pb–Bi: 18.0
Fig. A2.5 Comparison
between neutron spectra with
the use of W, W–Be and
Pb–Bi targets (Refs. [1–2])
10
-2
10
-1
10
0
10
1
10
2
10
-10
10
-9
10
-8
10
-7
10
-6
Neutron energy [MeV]
Neutron flux per energy bin [1/cm
2
/eV/source]
W target
W-Be target
Pb-Bi target
Pb-Bi
W-Be
W