Development of technology for continuous acoustic- emission monitoring of operational damageability of metal in safety-related npp equipment

UDC: 
УДК 621.039

Issue of journal:

Abstract: 

Safe operation of NPP primary equipment whose design service life has expired requires
the development of new approaches in integrity diagnostics and monitoring due to high
level of metal ageing.
These approaches should be based on nondestructive testing methods which make it
possible to inspect the equipment not only during the repair period, but also under operating
conditions, when the initiation and growth of dangerous defects occur. Among the modern
methods of nondestructive testing, suitable for use in the operation period, the acoustic
emission method demonstrates high efficiency. The article presents the results of work on
the development of a multiparameter system for acoustic emission monitoring of nuclear
power plant equipment damageability during power unit operation with due account of
specific features of NPP control. The stages of the work with the assessment of and taking
into account all influencing factors on the system under development, i.e. the need to
maintain the system performance in a longterm operation at high temperature, the complex
geometry of the monitored item, increased noise level, as well as the requirements for
collecting and transferring the monitoring information via the Internet for operational data
processing and presentation are described. A series of experiments on the debugging of the
system under laboratory conditions, conducted to refine and validate the selected control
methods, are described as well.

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