Original scientific paper

Sludge Deposit Mapping for Steam Generators

Ivan Rep ; INETEC – Institute for Nuclear Technology Dolenica 28, Lučko, Croatia
Tomislav Tomašić ; INETEC – Institute for Nuclear Technology Dolenica 28, Lučko, Croatia
Darko Barilar ; INETEC – Institute for Nuclear Technology Dolenica 28, Lučko, Croatia

Abstract

During plant operation, corrosion products from feedwater, drain and condensate system
accumulate on the secondary side of steam generator in form of scaled deposits around the tubes
and sludge piles on top of the tubesheet. These deposits increase potential for corrosion, affect fluid
flow and reduce heat transfer efficiency of the steam generator.
Using data obtained during periodical eddy current examination of steam generator tubing,
information on sludge deposit location and thickness is extracted from low frequency absolute
channels. Sludge deposits can be detected over the whole length of the inspected tube. Using
automatic analysis deposit results are provided within 36 hours after the inspection. Results are
imported in Sludge Mapping software and presented in 3D visualization of steam generator. Both
PWR and VVER steam generator visualization is supported.
Sludge mapping software provides visual information on sludge deposit thickness using color
code and by calculation position of sludge indication, software draws the indication on the location
within the steam generator where indication was found. Sludge mapping software provides
information on heavy sludge loading areas of steam generator and can help with tracking of sludge
build-up over time that can be used for optimizing steam generator maintenance.
This paper presents INETEC’s Sludge Mapping solution, its functionality and features for
visualization of sludge deposit location and thickness within the steam generator.

Keywords

steam generator; NDE; sludge deposit; sludge mapping

Hrčak ID:

199627

URI

https://hrcak.srce.hr/199627

Publication date:

15.10.2017.

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