Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Passive acoustic leak detection in energy conversion systems of sodium fast reactors
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0003-1358-9355
2016 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

Reaching the goals of Generation IV nuclear power is challenging. However, no less than six reactor concepts have been identified as capable of fulfilling the demands. Among these, the Sodium Fast Reactor (SFR), probably represents the most mature technology as about 20 SFR plants have been operated to this day.

 

One design-specific issue of the SFR is the risk of leak and sodium-water reaction inside a steam generator. Standard monitoring is based on hydrogen detection, resulting in high sensitivity but slow response. The alternative of acoustic leak detection methods has been studied since the 1970s since they are able to respond much faster. Demonstrating low false alarm rate while detecting the fairly weak and possibly unknown acoustic signals of leaks has however proven to be difficult.

 

Today, the CEA performs R&D, notably within the scope of the ASTRID project, with the aim of eliminating the sodium-water reaction risk. This is achieved by a Brayton cycle, using a nitrogen turbine and compact sodium-nitrogen heat exchangers. In case of a leak in this system, the low solubility of nitrogen in sodium and the high pressure in the tertiary circuit would increase the secondary pressure, locally deteriorate performance and possibly result in harmful hydrodynamic effects. Together with the risks of a potential gas leak over to the reactor, this motivates the use of leak detection also for this design.

 

This thesis concerns passive acoustic leak detection, primarily for a SFR sodium-nitrogen heat exchanger, arguing that this method is suitable based on experiments, numerical simulations and studies on algorithms. The word “passive” here refers to a system that does not send out any signals, but rather records the noise of the plant and detects leaks as changes in this signal. The thesis covers experiments on normal operation and leak-simulating setups as well as machine-learning based detection methods intended to be of interest also for change detection in general.

Place, publisher, year, edition, pages
Kungliga Tekniska högskolan, 2016. , p. 167
Series
TRITA-FYS, ISSN 0280-316X ; 2016-79
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-199415ISBN: 978-91-7729-239-5 (print)OAI: oai:DiVA.org:kth-199415DiVA, id: diva2:1062483
Public defence
2017-01-20, FA32, Roslagstullsbacken, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, B0774801
Note

QC 20170109

Available from: 2017-01-09 Created: 2017-01-06 Last updated: 2017-01-09Bibliographically approved

Open Access in DiVA

fulltext(36197 kB)197 downloads
File information
File name FULLTEXT01.pdfFile size 36197 kBChecksum SHA-512
8bfb4afacf919230b53d6eed49bf2430582026387f56a1963bc2ed5ebcac893ea0577e4c3757a7a663fddf327c3eadbf99da64af2ace9d0be815f68b3dc48d23
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Riber Marklund, Anders
By organisation
Reactor Technology
Other Engineering and Technologies not elsewhere specified

Search outside of DiVA

GoogleGoogle Scholar
Total: 197 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 666 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf