The A-core (Fig. 9.1) employed in the ADS experiments was essentially a
thermal neutron system composed of a highly enriched uranium fuel and the
polyethylene moderator/reflector. In the fuel region, a unit cell is composed of
the highly enriched uranium fuel plate 1/16 in. thick and polyethylene plates
1/4 in. and 1/8 in. thick (Fig. 9.2). The SV assembly is composed of a
5.08 Â 5.08 Â 5.08 cm center void region, 32 fuel unit cells, and the polyethylene
blocks. In these ADS experiments, three types of fuel rods designated as the normal,
partial, and special fuel SV were employed. For reasons of the safety regulations for
KUCA, the heavy metal target was located not at the center of the core but outside
the critical assembly. As in the previous ADS experiments with 14 MeV neutrons,
A
B
D
E
G
H
I
J
K
s'
L
F ' SV F '
M
O
P
Q
f
f
f
f
f
f
f
f
f
f
f
f
f s f s f s
f
b b s b s b s b
b b s b s b s b
s s s
s s s
F F S V F F
F F SV F F
F F F F F
F F F F F
R
T
U
V
W
X
Y
Z
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
F
F '
SV
Partial fuel (3/8"P14EU)
UIC detector
Proton beams
Fission chamber
SV Fuel (3/8"P32EU)
Neutron source (Am-Be)
Normal fuel (3/8"P36EU)
Polyethylene reflector
Control rod
Safety rod
C
S
N
f
Fe + polyethylene
fs Void × 3 + Fe + polyethylene
b
Polyethylene + boron (10wt%)
bs Void× 3 + polyethylene + boron (10wt%)oid
s'
Void× 1 + polyethylene
s
V o i d× 3 + polyethylene
Tungsten target
Aluminum sheath
1"φ 3 He detector
1/2"φ BF3 detector
UIC#5
FC#2
FC#3
UIC#6
UIC#4
FC#1
N
FC
UIC
C3
S5
C1
S6
S4
C2
Fig. 9.1 Top view of the configuration of the A-core in the accelerator-driven system (ADS)
experiments with 100 MeV protons
Polyethylene (PE)
(486.68 mm)
Unit cell
(10.97 mm)
1/8”PE+1/4”PE
(3.09 + 6.30) mm
1/16” EU
(1.59 mm)
Polyethylene (PE)
(512.10 mm)
1”Al plate
1/2”PE× 2
1/2”PE × 5+1/8”PE× 5
Reflector 537.48 mm
(Lower)
Fuel 395.04 mm
(Unit cell 36 times)
Reflector 591.48 mm
(Upper)
Polyethylene (PE)
(486.68 mm)
Polyethylene (PE)
(512.10 mm)
Fig. 9.2 Side view of of 3/8P
00 36EU fuel assembly (F, Fig. 9.1) in the A-core
9 Accelerator-Driven System (ADS) Study in Kyoto University Research Reactor. . .
83
thermal neutron system composed of a highly enriched uranium fuel and the
polyethylene moderator/reflector. In the fuel region, a unit cell is composed of
the highly enriched uranium fuel plate 1/16 in. thick and polyethylene plates
1/4 in. and 1/8 in. thick (Fig. 9.2). The SV assembly is composed of a
5.08 Â 5.08 Â 5.08 cm center void region, 32 fuel unit cells, and the polyethylene
blocks. In these ADS experiments, three types of fuel rods designated as the normal,
partial, and special fuel SV were employed. For reasons of the safety regulations for
KUCA, the heavy metal target was located not at the center of the core but outside
the critical assembly. As in the previous ADS experiments with 14 MeV neutrons,
A
B
D
E
G
H
I
J
K
s'
L
F ' SV F '
M
O
P
Q
f
f
f
f
f
f
f
f
f
f
f
f
f s f s f s
f
b b s b s b s b
b b s b s b s b
s s s
s s s
F F S V F F
F F SV F F
F F F F F
F F F F F
R
T
U
V
W
X
Y
Z
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
F
F '
SV
Partial fuel (3/8"P14EU)
UIC detector
Proton beams
Fission chamber
SV Fuel (3/8"P32EU)
Neutron source (Am-Be)
Normal fuel (3/8"P36EU)
Polyethylene reflector
Control rod
Safety rod
C
S
N
f
Fe + polyethylene
fs Void × 3 + Fe + polyethylene
b
Polyethylene + boron (10wt%)
bs Void× 3 + polyethylene + boron (10wt%)oid
s'
Void× 1 + polyethylene
s
V o i d× 3 + polyethylene
Tungsten target
Aluminum sheath
1"φ 3 He detector
1/2"φ BF3 detector
UIC#5
FC#2
FC#3
UIC#6
UIC#4
FC#1
N
FC
UIC
C3
S5
C1
S6
S4
C2
Fig. 9.1 Top view of the configuration of the A-core in the accelerator-driven system (ADS)
experiments with 100 MeV protons
Polyethylene (PE)
(486.68 mm)
Unit cell
(10.97 mm)
1/8”PE+1/4”PE
(3.09 + 6.30) mm
1/16” EU
(1.59 mm)
Polyethylene (PE)
(512.10 mm)
1”Al plate
1/2”PE× 2
1/2”PE × 5+1/8”PE× 5
Reflector 537.48 mm
(Lower)
Fuel 395.04 mm
(Unit cell 36 times)
Reflector 591.48 mm
(Upper)
Polyethylene (PE)
(486.68 mm)
Polyethylene (PE)
(512.10 mm)
Fig. 9.2 Side view of of 3/8P
00 36EU fuel assembly (F, Fig. 9.1) in the A-core
9 Accelerator-Driven System (ADS) Study in Kyoto University Research Reactor. . .
83