Probabilistic Structural Integrity Analysis of Boiling Water Reactor Pressure Vessel under Low Temperature Overpressure Event
Table 6
Fractions of CPI and CPF by control materials.
Major region
Material ID
32 EFPY
64 EFPY
Total CPI
Total CPF
Control weld
Total CPI
Total CPF
Control weld
1.38 × 10−7
1.30 × 10−7
4.13 × 10−7
3.85 × 10−7
% of CPI
CPI
% of CPF
CPF
% of CPI
CPI
% of CPF
CPF
8
Plate SC-03-S3
71.32
9.84 × 10−8
70.62
9.18 × 10−8
W-1001-08, W-1001-09, W-1102-3
62.17
2.57 × 10−7
60.43
2.33 × 10−7
W-1001-08, W-1001-09, W-1102-3
10
Plate SC-03-S1
5.33
7.36 × 10−9
5.45
7.09 × 10−9
W-1001-07
7.64
3.16 × 10−8
7.90
3.04 × 10−8
W-1001-07
12
Plate SC-04-S3
23.34
3.22 × 10−8
24.53
3.19 × 10−8
W-1001-10, W-1001-12
29.98
1.24 × 10−7
31.45
1.21 × 10−7
W-1001-10, W-1001-12
13
Plate SC-04-S2
0
0
0
0
W-1001-11
0.21
8.67 × 10−10
0.21
8.09 × 10−10
W-1001-11
The conditional probabilities should be multiplied by 10−3/year (the occurrence frequency of LTOP transient) to determine the fracture and failure frequencies per year.
