240
M. Yamanaka
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
-0.002
0
0.002
0.004
0.006
0.008
0.010
0.012
0.014
0.016
0
5
10
15
20
Neutron energy [eV]
Sensitivity per unit lethargy [-]
EE1 (1/8"P60EUEU)
E3 (3/8"P36EU)
Standard deviation
Standard deviation [%]
Standard deviation
EE1
E3
Fig. 8.14 Sensitivity profile and standard deviation in covariance data for 27 Al (n, γ ) reactions
(HEU plate) (Ref. [2])
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
0
0.002
0.004
0.006
0.008
0.010
0.012
0.014
0
10
20
30
40
50
Neutron energy [eV]
Sensitivity per unit lethargy [-]
EE1 (1/8"P60EUEU)
E3 (3/8"P36EU)
Standard deviation
Standard deviation [%]
Standard deviation
EE1
E3
Fig. 8.15 Sensitivity profile and standard deviation in covariance data for 27 Al (n, n ) reactions
(HEU plate) (Ref. [2])
Table 8.14 Uncertainty [pcm] of k eff attributed to manufacturing variation in HEU plates in
Table 8.1 and reproducibility of control rods for EE1 core (Ref. [2])
Case
Enrichment of
235 U
Vertical length
Horizontal
length
Thickness
Reproducibility
of control rod
I-1
4.25 ± 0.09
4.19 ± 0.38
3.68 ± 0.43
9.44 ± 0.23
3.23 ± 3.55
I-2
4.21 ± 0.09
3.80 ± 0.40
4.10 ± 0.41
9.60 ± 0.23
2.22 ± 3.77
I-3
4.08 ± 0.09
4.51 ± 0.34
3.59 ± 0.40
9.68 ± 0.23
7.22 ± 3.57
I-4
4.21 ± 0.09
4.59 ± 0.39
4.40 ± 0.38
9.68 ± 0.23
5.54 ± 3.56
I-5
4.14 ± 0.09
3.69 ± 0.37
4.22 ± 0.41
10.08 ± 0.23
4.65 ± 3.56
I-6
4.13 ± 0.09
4.15 ± 0.38
4.23 ± 0.41
9.80 ± 0.23
4.28 ± 3.56