Safety Assessment Of Austenitic Steel Nuclear Power Plant Pipelines
IR@SERC: CSIR-Structural Engineering Research Centre, Chennai
View Archive Info| Field | Value | |
| Title |
Safety Assessment Of Austenitic Steel Nuclear Power Plant Pipelines
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| Creator |
Anoop, M.B.
Balaji Rao, K. Lakshmanan, N. |
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| Subject |
Safety assessment
Piping component Stress corrosion cracking Failure probability Fuzzy sets Monte Carlo simulation |
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| Description |
Stress corrosion cracking (SCC) is an important degradation mechanism to be considered for safety assessment of nuclear piping
components made of austenitic steels, especially in the heat-affected zones. Damage due to SCC occurs in a susceptible material, in a
corrosive environment, in the presence of high temperature and high applied/residual stresses. The operating conditions and the
environmental conditions show variations during the lifetime of the power plant. Also, there will be variations in micro-structural
properties of the material of piping components. These variations should be taken into account while assessing the safety of the piping
component against SCC. This can be accomplished by treating the relevant variables as random or fuzzy depending upon the source and
type of uncertainty. In this paper, an attempt has been made to compute the fuzzy failure probabilities of a piping component against
SCC with time, using an approach combining the vertex method with the Monte Carlo simulation technique. The initiation and
propagation stages of stress corrosion cracks are modelled using a modified PRAISE approach. The degree of sensitisation, material
fracture toughness, yield strength, ultimate strength and applied stress are considered as random variables, while operating temperature
and oxygen concentration are considered as fuzzy variables. The R6 procedure is used in the computation of the fuzzy failure
probabilities. The usefulness of the approach is demonstrated through an example problem.
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| Date |
2009
2009 2008 |
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| Type |
Journal article
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| Identifier |
International Journal of Pressure Vessels and Piping, Vol.85, 2008, p.238–247
http://hdl.handle.net/123456789/131 |
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| Language |
en
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| Rights |
It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
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| Publisher |
Elsevier (ScienceDirect)
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