scholarly journals Generated paths of an autocatalytic set of a secondary system of a pressurized water reactor

Author(s):  
Zainab Mahamud ◽  
Tahir Ahmad

A graph is used to model pairwise relation between objects. In this paper, it is used to model secondary system of pressurized water reactor. The process is presented as a dynamic graph by integrating the concept of Autocatalytic Set (ACS). The graph is then transformed into an omega algebra whereby all the possible paths of the process are determined. Seven variables are identified to represent the nodes with twenty one links to indicate catalytic relations among these nodes. A programming code of C++ is developed for the identification of these 317 links.

CORROSION ◽  
2006 ◽  
Vol 62 (10) ◽  
pp. 905-910 ◽  
Author(s):  
D. H. Hur ◽  
M. S. Choi ◽  
D. H. Lee ◽  
M. H. Song ◽  
J. H. Han

Abstract Pitting corrosion was the primary cause of the Alloy 600 (UNS N06600) steam generator tube degradation in a Korean pressurized water reactor (PWR) plant. Pulled tube examinations and remedial measures were carried out to mitigate the pitting. Based on the destructive examinations, the main causes of pitting corrosion were considered to be the following: accumulated sludge with a high copper content due to corrosion of copper alloys in the secondary system, acidic crevice conditions caused by chloride from condenser leakage, and ingress of air during layup. Countermeasures such as copper alloy replacement, water chemistry control, and chemical cleaning were implemented to mitigate the pitting. Chemical cleaning was evaluated as the most effective.


2015 ◽  
Vol 11 (4) ◽  
pp. 107-112 ◽  
Author(s):  
Azmirul Ashaari ◽  
Tahir Ahmad ◽  
Mustaffa Shamsuddin ◽  
Wan Munirah Wan Mohamad ◽  
Nazira Omar

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