6 Nuclear Transmutation of Minor Actinide
169
4
5
6
7
8
9
10 11 12 13
14 15 16
17 18 19 20 21 22
23 24 25 26
A
G r G r G r G r
G r G r G r G r G r G r
G r G r G r G r G r G r
G r G r G r G r
F
r
G
r
G
r
G
r
G
B
r
G
r
G
r
G
r
G
D
12
r
G
r
G
r
G
r
G
E
p
r
G
p
p
p
r
G
r
G
p
p
p
r
G
G
r
G
p
p
p
r
G
r
G
p
p
p
r
G
H
r
G
p
p
p
p
p
p
p
p
p
p
p
r
G
I
r
G
p
p
p
p
p
p
p
p
p
p
p
r
G
J
p
p
r
G
K
12
F
F
F
12
r
G
r
G
p
p
p
p
p
r
G
L
F
F
F
F
F
r
G
p
p
p
p
p
r
G
M
F
F
F
F
F
r
G
p
p
p
p
p
r
G
O
F
F BTB F
F
r
G
p
p
p
p
p
p
r
G
Q
F
F
F
F
F
r
G
p
p
p
p
p
r
G
R
F
F
F
F
F
r
G
p
p
r
G
p
p
p
p
p
p
p
p
p
p
p
r
G
T
r
G
p
p
p
p
p
p
p
p
p
p
p
r
G
U
r
G
p
p
p
p
p
p
p
p
p
p
p
r
G
V
W G r
Gr
X
G r
Gr
Y
G r
Gr
Z
G r
Gr
BTB BTB chamber
Z' Gr Gr Gr Gr
Gr Gr Gr Gr Gr Gr
Gr Gr Gr
Gr Gr Gr Gr Gr Gr
Gr Gr Gr Gr
Pb-Bi target
Polyethylene moderator
Polyethylene reflector
Control rod
Normal fuel (1/8"p60EUEU)
Uncompensated ionization chamber
Graphite
Partial fuel (1/8"p12EUEU)
Safety rod
Neutron source (Am-Be)
Fission chamber
N
FC
UIC
S
C
C3
S5
S4
C1
C2
S6
N
FC#1
UIC#4
FC#2
UIC#5
UIC#6
FC#3
Proton
beams
Fig. 6.15 Top view of the KUCA A-core for MA irradiation experiments by ADS (Ref. [5])
Fuel (3”)
(Unit cell 12 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) 12
(3”)
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. 6.16 Schematic drawing of “12” partial fuel rod (Fig. 6.15) (Ref. [5])
was deduced by the foil activation method [8] (over 0.3 MeV threshold energy; In
foil; 10 × 10 × 1 mm) obtained at the location of the Pb–Bi target.
6.2.1.3 Neutron Characteristics
For carrying out the ADS experiments, subcriticality state was made by inserting
control rod C2 into the lower limit position (0.00 mm) and withdrawing other rods
(C1, C3, S4, S5, and S6) fully (1200.00 mm) from the core. Subcriticality was then
deduced experimentally by combining control rod C2 reactivity worth by the rod