scholarly journals Economic Evaluation of Maintenance Strategies for Steam Generator Tubes Using Probabilistic Fracture Mechanics and Financial Method

2004 ◽  
Vol 3 (2) ◽  
pp. 151-164 ◽  
Author(s):  
Mitsuyuki SAGISAKA ◽  
Yoshihiro ISOBE ◽  
Shinobu YOSHIMURA ◽  
Genki YAGAWA
Keyword(s):  
Economic Evaluation ◽  
Fracture Mechanics ◽  
Steam Generator ◽  
Maintenance Strategies ◽  
Probabilistic Fracture Mechanics ◽  
Steam Generator Tubes

scholarly journals A Bayesian updating of crack distributions in steam generator tubes

2021 ◽  
Vol 30 (2) ◽  
pp. 33-44
Author(s):  
Alexandre Santos Francisco ◽  
Tiago Simões
Keyword(s):  
Steam Generator ◽  
Failure Probability ◽  
Nuclear Power ◽  
Power Plants ◽  
Plastic Collapse ◽  
Structural Failure ◽  
Maintenance Strategies ◽  
Threshold Size ◽  
Steam Generator Tubes ◽  
Good Agreement

The structural failure of steam generator tubes is a common problem that can a ect the availability and safety of nuclear power plants. To minimize the probability of occurrence of failure, it is needed to implement maintenance strategies such as periodic nondestructive inspections of tubes. Thus, a tube is repaired or plugged whenever it has detected a crack which a threshold size is overtaken. In general, uncertainties and errors in crack sizes are associated with the nondestructive inspections. These uncertainties and errors should be appropriately characterized to estimate the actual crack distribution. This work proposes a Bayesian approach for updating crack distributions, which in turn allows computing the failure probability of steam generator tubes at current and future times. The failure criterion is based on plastic collapse phenomenon, and the failure probability is computed by using the Monte-Carlo simulation. The failure probability at current and future times is in good agreement with the ones presented in the literature.

Economic Evaluation of Maintenance Strategies for Steam Generator Tubes Using Probabilistic Fracture Mechanics and a Financial Method

2007 ◽  
Vol 120 ◽  
pp. 119-126
Author(s):  
Yoshihiro Isobe ◽  
Mitsuyuki Sagisaka ◽  
Shinobu Yoshimura ◽  
Genki Yagawa
Keyword(s):  
Fracture Mechanics ◽  
Steam Generator ◽  
Net Present Value ◽  
Point Of View ◽  
Discounted Cash Flow ◽  
Pressurized Water ◽  
Economic Point ◽  
Probabilistic Fracture Mechanics ◽  
Water Reactors ◽  
Financial Indices

As an application of probabilistic fracture mechanics (PFM) and a financial method, a risk-benefit model was developed for the purpose of optimizing maintenance activities of steam generator (SG) tubes used in pressurized water reactors (PWRs). To justify whether or not it is worth while implementing the selected maintenance strategy in terms of an economic point of view, net present value (NPV) was calculated as an index which is one of the most fundamental financial indices for decision-making based on the discounted cash flow (DCF) method.

Elastic-plastic fracture mechanics assessment for steam generator tubes with through-wall cracks

2007 ◽  
Vol 30 (2) ◽  
pp. 131-142 ◽  
Author(s):  
NAM-SU HUH ◽  
JONG-MIN KIM ◽  
YOON-SUK CHANG ◽  
YOUNG-JIN KIM ◽  
SEONG-SIK HWANG ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Steam Generator ◽  
Elastic Plastic ◽  
Steam Generator Tubes
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