6 Nuclear Transmutation of Minor Actinide
159
(a) Normal fuel rod “F” (HEU-PE)
(b) Special fuel rod “f” containing Pb plates (HEU-Pb)
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”)
Polyethylene
(10”p+1/2”PE 17
+1/4”PE)
(18.75”)
(1/16”HEU 2 +
1/8”p) 10 (2.5”)
Al plate
(20.00 mm)
Gr (2”)
Gr (2”) + Void (1.7”)
Reflector (21.54”)
(Lower)
Fuel (15”)
(Unit cell 60 times)
Reflector (23.45”)
(Upper)
(1/16”HEU 2 +
1/8”Pb) 40
(10”)
Polyethylene
(10”p+1/2”PE 19
+1/4”PE)
(19.75”)
(1/16”HEU 2 +
1/8”p) 10 (2.5”)
Fig. 6.2 Schematic drawing of fuel assemblies in the KUCA A-core (Fig. 6.1) (Ref. [1])
Connector
Copper pipe
(for filling and
evacuating gas)
Sample deposit
Chamber (Al)
Electrode (anode)
O-ring
20 mm
diam.
6 mm
60.19 mm
37 mm
diam.
40 mm
diam.
49 mm
diam.
54.19 mm
48.19 mm
Fig. 6.3 BTB fission chamber (Ref. [1])