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
Verifying PWR assemblies with rod cluster control assembly inserts using a DCVD
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0001-8207-3462
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-3136-5665
(English)Manuscript (preprint) (Other academic)
Abstract [en]

One of the instruments available to authority inspectors to measure and characterize the Cherenkov light emissions from irradiated nuclear fuel assemblies in wet storage is the Digital Cherenkov Viewing Device (DCVD). Based on the presence, characteristics and intensity of the Cherenkov light, the inspectors can verify that an assembly under study is not a dummy object, as well as perform partial defect verification of the assembly.

 

PWR assemblies are sometimes stored with a rod cluster control assembly (RCCA) inserted, which affects the Cherenkov light production and transport in the assembly. Such an insert will also block light from exiting the top of the fuel assembly, which will affect the light distribution and intensity of the Cherenkov light emissions. Whether or not this constitutes a problem when verifying the assemblies for gross or partial defects with a DCVD has not previously been investigated thoroughly.

 

In this work, the Cherenkov light intensity of a PWR 17x17 assembly with two different RCCA inserts were simulated and analysed, and compared to the Cherenkov light intensity from an assembly without an insert. For the studied assembly and insert types, the DCVD was found to be able to detect partial defects on the level of 50% in all three cases with similar sensitivity, though with a higher measurement uncertainty due to the reduced intensity when an RCCA insert is present. Consequently, for the studied assembly and insert types, assemblies with inserts can be verified with the same methodology and using the same requirements as for assemblies without inserts, with similar partial defect detection performance.

 

The approach used also made it possible to investigate the minimum sensitivity of the DCVD required to detect partial defects of other levels than 50% in the PWR 17x17 fuel assembly without and with RCCA inserts. These studies gave results that were in agreement with previous results, despite differences in substitution patterns, substitution materials, modeling software and analysis approach.

Keywords [en]
DCVD; partial defect verification; Rod cluster control assembly, Cherenkov light;
National Category
Engineering and Technology Other Physics Topics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-381070OAI: oai:DiVA.org:uu-381070DiVA, id: diva2:1302240
Funder
Swedish Radiation Safety Authority, SSM2017-5979Swedish National Infrastructure for Computing (SNIC), p2007011
Note

Accepterad för publicering i ESARDA-Bulletinen

Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04

Open Access in DiVA

No full text in DiVA

Search in DiVA

By author/editor
Branger, ErikJansson, Peter
By organisation
Applied Nuclear Physics
Engineering and TechnologyOther Physics Topics

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 8 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