348
Appendix A5: 232 Th-Fueled ADS Core
Polyethylene (PE)
(19”+1/2”*9+1/4” =
23.25”)
Polyethylene (PE)
(19”+1/2”*12+1/8” =
25.125”)
+
Void (1.575”)
Al plate (20.00 mm)
Reflector 24.05”
(Lower)
Fuel 9.25”
(Unit cell 4 times)
Reflector 26.70”
(Upper)
Unit cell
(1/8”Th+5*(1/16”HEU+1/8”PE+1/4”PE))
(37/16”)
1/8”Th
1/8”PE+1/4”PE
(3/8”)
1/16”HEU
Fig. A5.7 Fall sideway view of fuel assembly Th–HEU–5PE (Ref. [1])
Polyethylene (PE)
(19”+1/2”*8+1/4” =
23.25”)
Polyethylene (PE)
(19”+1/2”*11 = 24.5”
+
Void (3.45”)
Al plate (20.00 mm)
Reflector 24.05”
(Lower)
Fuel 8”
(Unit cell 4 times)
Reflector 27.95”
(Upper)
Unit cell
(1/8”Th+4*(1/16”HEU+1/2”Gr)+1/8”PE)
(2”)
1/8”Th
1/2”Gr
1/16”HEU
1/8”PE
Fig. A5.8 Fall sideways view of fuel assembly Th–HEU–Gr–PE (Ref. [1])
Table A5.1 List of thorium-fueled ADS cores (Ref. [1])
Core
Cell pattern
k eff
Th–PE
1/8 Th+1/2 PE
0.00613
Th–Gr
1/8 Th+1/2 Gr
0.00952
Th–Be
1/8 Th+1/2 Be
0.00765
Th–HEU–PE
1/8 Th+1/16 HEU+3/8 PE
0.58754
NU–PE
1/8 NU+1/2 PE
0.50867
Th–HEU–5PE
1/8 Th+5*(1/16 HEU+3/8 PE)
0.85121
Th–HEU–Gr–PE
1/8 Th+4*(1/16 HEU+1/2 Gr)+1/8 PE
0.35473
Th: Thorium; PE: Polyethylene; Gr: Graphite; Be: Beryllium;
HEU: Highly-enriched uranium; NU: Natural uranium