8 Sensitivity and Uncertainty of Criticality
239
0
40
80
120
160
200
al-27 n,n
vs al-27 n,n
al-27 n,n'
vs al-27 n,n'
albound n,n
vs albound n,n
albound n,n'
vs albound n,n'
Uncertainty [pcm]
All rods: full out position
C1: critical position
C3: critical position
C3: critical position, C1: inserted
C3: critical position, C2: inserted
C1: critical position, C3: inserted
27
Al (n, n) vs
27
Al (n, n)
27
Al (n, n’) vs
27
Al (n, n’)
Al (n, n) vs Al (n, n)
Al (n, n’) vs Al (n, n’)
HEU plates (U-Al alloy)
Aluminum sheath
Fig. 8.12 Uncertainty of aluminum in HEU (U-Al alloy) plates, aluminum sheath, and control rod
guide tube induced by nuclear data in EE1 core (Ref. [2])
0
40
80
120
160
200
al-27 n,n
vs al-27 n,n
al-27 n,n'
vs al-27 n,n'
albound n,n
vs albound n,n
albound n,n'
vs albound n,n'
Uncertainty [pcm]
All rods: full out position
C1: critical position
C3: critical position
C3: critical position, C1: inserted
C1: critical position, C2: inserted
C1: critical position, C3: inserted
27
Al (n, n) vs
27
Al (n, n)
27
Al (n, n’) vs
27
Al (n, n’)
Al (n, n) vs Al (n, n)
HEU plates (U-Al alloy)
Aluminum sheath
Al (n, n’) vs Al (n, n’)
Fig. 8.13 Uncertainty of aluminum in HEU (U-Al alloy) plates, aluminum sheath, and control rod
guide tube induced by nuclear data in E3 core (Ref. [2])
and 8.11 (2 pcm through 11 pcm), demonstrating that the measured reactivity was
slightly varied by the position of control rods.
8.4 Conclusion
Sensitivity and uncertainty analyses were conducted with the combined use of experimental results (excess reactivity and control rod worth) carried out at KUCA and
numerical simulations by the MCNP6.1 calculations, the SRAC2006 and MARBLE
code systems. The experimental value was compared with the calculated one by