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Projects / Programmes source: ARIS

Limit states of npp components affected by aging

Research activity

Code Science Field Subfield
2.13.00  Engineering sciences and technologies  Process engineering   

Code Science Field
T160  Technological sciences  Nuclear engineering and technology 
T500  Technological sciences  Safety technology 
Keywords
Integrity of pressurized systems, intergranular stress corrosion cracking, numerical simulations, probability of failure
Evaluation (rules)
source: COBISS
Researchers (3)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  07025  PhD Leon Cizelj  Energy engineering  Head  1998 - 2001  963 
2.  13372  MSc Tomaž Dvoršek  Process engineering  Researcher  1998 - 2001  51 
3.  04143  MSc Ljubo Fabjan  Energy engineering  Researcher  1998 - 2001  177 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,976 
Abstract
The research is focussed on the limit states, which are important for the safety of degraded pressurized vessels and pipes: ? Excessive leakage through the defects (without complete failure of the component) and ? Failure of the component. The tubes of steam generators of nuclear power plants, affected by stress corrosion cracking, are taken as an example. An algorithm was developed to estimate the failure probability, which accounts for the most important influencing parameters: ? Mathematical model of the limit state function, which delineates between safe and failed states of the component; ? Defect growth model and ? Model of the non-destructive examination method. The results of sensitivity analyses directed the future research into improvements of the models describing the limit state function. The main part of the efforts is the simulation of the random microstructure of the material using the Incomplete random tessellation. The main goal is the modelling of initiation and growth of intergranular cracks together with appreciation of the random microstructure.
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