Issue << content << Austenite pipeline DN300 maintaining integrity of multiple forced circulation loop reactor plant RBMK-1000


DOI: 10.12737/article_58e641157fa6c0.81561304

2017. Vol.20. 1, pp. 56-65

Austenite pipeline DN300 maintaining integrity of multiple forced circulation loop reactor plant RBMK-1000

A. A. Arefiev, A. A. Petrov, B. P. Strelkov

Introduction. Small-opening cracks specific for intergranular stress-corrosion cracking (IGSCC) feature substantial depth and length. These cracks are extremely dangerous for the integrity of welded butt joints of atomic power station pipelines. This paper is aimed at the development of a set of measures to lower the tendency of welded butt joints to generate IGSCC cracks and implement new technologies and procedures for the welded butt joint nondestructive testing.
Method. Analysis of basic factors leading to IGSCC damages in the welded butt joint metal and a set of measures to lower the effect of these factors. Analysis of the nondestructive testing current methods and equipment, and their perfection.
Results. A well-rounded program of activities has been implemented to solve the problem of welded butt joints damage occurring due to IGSCC, technologies to redistribute stresses in the pipeline welded butt joints, and their high-heat treatment have been implemented, new methods to repair welded butt joints have been suggested and implemented. Water chemistry management at atomic power stations, as well as nondestructive testing current methods and equipment have been perfected.
Conclusions. The range of works performed has allowed proving reliability of austenitic pipelines welded according to requirements of the existing specifications and technical documentation and recommendations of IAEA.
Keywords: defect, cracks, discontinuity, test specimens, acoustic flaw detector, transducers, blind tests, metallographic examination, probability of detection, reliability of inspection
 
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