Residual Life Assessment of Steam Generators With Alloy 600TT Tubing: Methods and Application

2009 ◽  
Author(s):  
Ian de Curieres ◽  
Marie-Christine Meunier ◽  
Pierre Joly
Keyword(s):  
Probabilistic Model ◽  
Damage Evolution ◽  
Residual Life ◽  
Tube Bundle ◽  
Life Assessment ◽  
Steam Generators ◽  
Initiation And Propagation ◽  
Residual Life Assessment ◽  
Inspection Data ◽  
Propagation Stage

The aim of the paper is to introduce methods to estimate the residual life of steam generators with alloy 600TT (thermally treated) tubing, taking into account PWSCC as the main contributor damage. The methods take into account both initiation and propagation of PWSCC cracks in the expansion transition zone of SG tubes, as well as the state of damage (cracking and plugging) of the tube bundle, at a given time, known from inspection results. A probabilistic model is used to treat initiation, while propagation stage is treated in a deterministic way based on inspection data. After introducing the methods used to assess the residual life, a brief parametric study will be shown, to illustrate the effects of initiation versus propagation. Eventually, the cases of a few actual steam generators with tubing made of alloy 600TT, showing different situations of present damage and damage evolution rates will be presented.

Residual Life Assessment of Steam Generators With Alloy 600 TT Tubing: Methods and Application

2010 ◽  
Vol 132 (10) ◽  
Author(s):  
Ian de Curieres ◽  
Marie-Christine Meunier ◽  
Pierre Joly
Keyword(s):  
Residual Life ◽  
Tube Bundle ◽  
Life Assessment ◽  
Alloy 600 ◽  
Steam Generators ◽  
Initiation And Propagation ◽  
Primary Water ◽  
Residual Life Assessment ◽  
Inspection Data ◽  
Steam Generator Tubes

The aim of the paper is to introduce methods to estimate the residual life of steam generators with alloy 600 thermally treated (TT) tubing, taking into account primary water stress corrosion cracking (PWSCC) as the main contributor damage. The methods take into account both initiation and propagation of PWSCC cracks in the expansion transition zone of steam generator tubes, as well as the current damage status (cracking and plugging) of the tube bundle, known from inspection results. A probabilistic model is used to treat initiation, while the propagation stage is treated in a deterministic way based on inspection data. After introducing the methods used to assess the residual life, a brief parametric study will be shown to illustrate the effects of initiation versus propagation. Eventually, the cases of a few actual steam generators with tubing made of alloy 600 TT showing different situations of present damage and damage evolution rates will be presented.

Residual service life estimation of bridges

2021 ◽  
Author(s):  
Mayank Bajaj ◽  
Biswajit Bhattacharjee
Keyword(s):  
Residual Life ◽  
Concrete Bridges ◽  
Life Assessment ◽  
Residual Service Life ◽  
Chloride Ingress ◽  
Service Life Estimation ◽  
Residual Life Assessment ◽  
Existing Bridges ◽  
Residual Service

<p>While concrete structures perform well in many situations, lack of durability has emerged as a significant issue for asset owners. A review of past bridge failures was done to identify the most probable causes of bridge failures. This study has tended to focus on current models used for estimating the time to deterioration of concrete bridges instigated by Chloride ingress and Fatigue. Subsequently, mathematical modelling of the best-suited deterioration model is done to arrive at the residual life of two existing bridges. This work has highlighted high variability in the parameters used to describe the durability related properties of in-situ aged concrete. A realistic residual life assessment can be achieved by correct evaluation of these parameters by periodic testing of bridge samples</p>

Criterial relationships for residual life assessment of materials

2006 ◽  
Vol 38 (4) ◽  
pp. 348-353 ◽  
Author(s):  
A. A. Lebedev ◽  
V. M. Mikhalevich
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Residual Life Assessment

Residual Life Assessment for Boiler Pressure Components Based on Measurements of Creep Strains

1988 ◽  
Vol 110 (3) ◽  
pp. 308-313 ◽  
Author(s):  
F. Mlynarski ◽  
J. Taler
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Strain Measurements ◽  
Years Of Service ◽  
Residual Life Assessment ◽  
Outside Diameter ◽  
Creep Strains

This paper discusses different methods for calculating the residual life for boiler pressure components operating under creep conditions, based on tube outside diameter strain measurements. These measurements were made for over 20 yr. The methods have been applied to the residual life calculation for pipelines of 20 or more years of service. Then the results have been compared.

scholarly journals Residual Life Assessment of Electricity Pylons – A Case Study

2009 ◽  
Vol 413-414 ◽  
pp. 219-228 ◽  
Author(s):  
John R. Maguire
Keyword(s):  
Structural Integrity ◽  
Residual Life ◽  
Life Assessment ◽  
Original Design ◽  
Integrity Assessment ◽  
Specific Safety ◽  
Residual Life Assessment ◽  
Independent Assessment ◽  
Overhead Power Line

This case study describes a structural integrity assessment of a 220 kV overhead power line. The line comprises 70 pylons over a distance of approximately 30 km, predominantly in a valley location. The pylons are spaced at intervals of approximately 400 m and each pylon is approximately 32 m in height. The line was originally constructed in the 1950’s, approximately 50 years prior to the requested structural integrity assessment. This paper describes the independent assessment that was carried out. The review established site-specific safety factors at the time of original design and construction; at the time of the review (2007), accounting for the possible presence of the “Thomasstahl” steel; and in the future, at the anticipated end of pylon life (in 2012).

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