Appendix A4: 235 U-Fueled ADS Core in Medium-Fast Spectrum
315
(a) Fuel assembly “F” shown in Figs. A4.1 and A4.4
Poly. moderator (p)
(10”)
+
Poly. reflector (PE)
(1/2” 17 + 1/4”)
(8.75”)
Al plate
(20.00 mm)
Gr (2”)
Gr (2”) + Void (1.7”)
(1/16”HEU 2 + 1/8”p) 60
(15”)
Reflector (21.54”)
(Lower)
Fuel (15”)
(Unit cell 60 times)
Reflector (23.45”)
(Upper)
Poly. moderator (p)
(10”)
+
Poly. reflector (PE)
(1/2” 19 + 1/4”)
(9.75”)
(b) Partial fuel assembly “8”
Fuel (2”)
(Unit cell 8 times)
Polyethylene
(10”p+1/2”PE
17+1/4”PE)
(18.75”)
Al plate
(20.00 mm)
Al cells: (1/16”Al 2+1/8”p) 24
(6”) +Gr (2”)
Gr (2”) + Void (1.7”)
(1/16”HEU 2 + 1/8”p) 8
(2”)
Reflector (27.54”)
(Lower)
Reflector (29.45”)
(Upper)
Al cell
24
times
Al cell
24
times
Polyethylene
(10”p+1/2”PE
19+1/4”PE)
(19.75”)
Al cells: (1/16”Al 2+1/8”p) 24
(6”)
Fig. A4.2 Fall sideway view of fuel rods shown in Fig. A4.1 (Ref. [1])