Appendix A2: 235 U-Fueled and Pb–Bi–Zoned ADS Core
269
Polyethylene (p)
(1/8”p 71 + 10”p 1)
(18.875”)
Unit cell
(7/16”)
1/8”p 3
(3/8”)
1/16”EU
(1/16”)
Polyethylene (p)
(1/8”p 27 + 10”p 2)
(23.375”)
Al plate
(20.00 mm)
Void
(1.213”)
Reflector 19.662”
(Lower)
Fuel 15.750”
(Unit cell 36 times)
Reflector 24.588”
(Upper)
Fig. A2.12 Fall sideway view of “F” (3/8 p36EU) fuel assembly in Fig. A2.11 (Ref. [1])
15
cells
(p)
(3.75”)
Polyethylene (p)
(1/8”p 73 + 10”p 1)
(18.875”)
Unit cell (1/16”HEU 2 + 1/8”p or 1/8”Pb-Bi (3.426 mm))
Polyethylene (p)
(1/8”p 27 + 10”p 2)
(23.375”)
Al plate
(20 mm)
30 cells (Pb-Bi)
(7.5”)
Reflector 19.662”
(Lower)
Fuel 15”
(Unit cell 60 times)
Reflector 24.588”
(Upper)
Void (1.213“)
15
cells
(p)
(3.75”)
Fig. A2.13 Fall sideway view of fuel assembly “f” shown in Fig. A2.11. (f: 1/8 p15EUEU <
1/8 PbBi30EUEU >1/8 p15EUEU) (Refs. [1, 3])
Polyethylene (p)
(1/8”p 71 + 10”p 1)
(18.875”)
Unit cell
(7/16”)
1/8”p 3
(3/8”)
1/16“ EU
(1/16”)
Polyethylene (p)
(1/8”p 27+10”p 2)
(23.375”)
Al plate
(20 mm)
Al cell
(1/16”Al + 1/8”p 3)
(7/16”)
Void
(1.213”)
Al cell
10 times
(4.375”)
Al cell
10 times
(4.375”)
Reflector 24.037”
(Lower)
Fuel 7”
(Unit cell 16 times)
Reflector 28.963”
(Upper)
Fig. A2.14 Fall sideway view of fuel assembly “16” (3/8 p16EU) shown in Fig. A2.11 (Refs. [1,
3])