8 Sensitivity and Uncertainty of Criticality
235
Table 8.12 Breakdown of the uncertainty [pcm] of k eff in nuclides and nuclear reactions in EE1
core (Ref. [2])
Component
Nuclides
reaction
versus
reaction
Case
I-1
I-2
I-3
I-4
I-5
I-6
HEU
235 U
χ
235 U
χ
770.86
± 0.27
772.51
± 0.27
772.28
± 0.27
779.51
± 0.28
773.71
± 0.27
777.73
± 0.27
235 U
¯
ν
235 U
¯
ν
360.18
± 0.01
360.12
± 0.01
360.13
± 0.01
359.77
± 0.01
360.06
± 0.01
359.88
± 0.01
235 U
(n, γ )
235 U
(n, γ )
216.32
± 0.01
216.33
± 0.01
216.36
± 0.01
216.34
± 0.01
216.34
± 0.01
216.34
± 0.01
235 U
(n, f )
235 U
(n, γ )
103.38
± 0.01
103.38
± 0.01
103.41
± 0.01
103.39
± 0.01
103.38
± 0.01
103.38
± 0.01
235 U
(n, f )
235 U
(n, f )
69.71
± 0.01
69.77
± 0.01
69.80
± 0.01
69.95
± 0.01
69.80
± 0.01
69.88
± 0.01
27 Al
(n, n)
27 Al
(n, n)
147.30
± 0.07
144.61
± 0.07
146.57
± 0.07
154.01
± 0.08
143.87
± 0.07
149.45
± 0.08
27 Al
(n, n )
27 Al
(n, n )
142.17
± 0.03
142.97
± 0.03
143.74
± 0.03
146.16
± 0.03
144.26
± 0.03
144.64
± 0.03
27 Al
(n, γ )
27 Al
(n, γ )
43.41
± 0.01
43.45
± 0.01
43.48
± 0.01
43.63
± 0.01
43.50
± 0.01
43.56
± 0.01
Polyethylene * 1 H
(n, n)
* 1 H
(n, n)
192.70
± 0.02
191.94
± 0.02
192.73
± 0.02
196.16
± 0.02
192.90
± 0.02
193.34
± 0.02
* 1 H
(n, γ )
* 1 H
(n, γ )
120.60
± 0.01
119.22
± 0.01
118.78
± 0.01
113.26
± 0.01
117.20
± 0.01
115.26
± 0.01
C (n,
n)
C (n,
n)
61.06
± 0.01
60.62
± 0.01
60.81
± 0.01
61.24
± 0.01
60.90
± 0.01
60.97
± 0.01
C (n,
n )
C (n,
n )
24.88
± 0.01
25.41
± 0.01
24.66
± 0.01
24.53
± 0.01
24.94
± 0.01
24.66
± 0.01
C (n,
n)
C (n,
n)
-24.07
± 0.01
-24.37
± 0.01
-23.94
± 0.01
-23.88
± 0.01
-24.10
± 0.01
-23.95
± 0.01
Aluminum
sheath
*27 Al
(n, n)
Al (n,
n)
93.22
± 0.03
92.56
± 0.03
95.85
± 0.03
96.56
± 0.03
95.91
± 0.03
96.67
± 0.03
*27 Al
(n, n )
Al (n,
n )
49.57
± 0.01
49.80
± 0.01
49.80
± 0.01
50.28
± 0.01
50.28
± 0.01
49.92
± 0.01
Control rod
10 B
(n, γ )
10 B
(n, γ )
9.5E-08 1.0E-03 9.5E-04 5.42E-03 1.59E-03 3.52E-03
*With consideration of thermal scattering law S(α, β)