PSI - Issue 41

Mohamed Amine Belyamna et al. / Procedia Structural Integrity 41 (2022) 372–383 Mohamed Amine Belyamna et al. / Structural Integrity Procedia 00 (2022) 000–000

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Nomenclature a

crack depth area of crack

A cr A p

area of cross-section of pipe one-half of crack length material dependent constants material dependent constants

b

C 1-9

C 12 - 13 , C 15

C 14

material dependent random variable spacing between two cracks

d

D IN-SCC

damage parameter modulus of elasticity

E G

material dependent constant

h J

pipe wall thickness

material dependent random variable

K

stress intensity factor

K ap K res

stress intensity factor for applied stress stress intensity factor for residual stress

l, l 1 , l 2

crack length

N N f O 2 Pa P f R i

number of simulations number of failure cases oxygen concentration degree of sensitization probability of failure internal radius of pipe

t I T

time to initiation of stress corrosion cracking

temperature

v 1 v 2

initiation crack growth velocity

fracture mechanics based crack growth velocity

γ σ

water conductivity

applied stress flow stress

σ f

σ LC σ net

load-controlled component of stress

net-section stress

Abbreviations and acronyms ASM

American Society of Materials Artificial neural network

ANN BWR MCS PFM IG-SCC PRAISE

Boiling water reactor

Intergranular Stress Corrosion Cracking Monte Carlo simulation Probabilistic fracture mechanics

Piping reliability analysis, including seismic events

SCC

Stress Corrosion Cracking

1. Introduction Stress corrosion cracking ( SCC) is one of the important mechanisms in the degradation of steels. This mechanism induces material cracking due to a combined action of a sensitive material, a tensile stress, and corrosive environment. In the piping of BWR the sensitive material in the vicinity of welds is the stainless steel AISI 304.