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  • Jacobsson Svärd, StaffanUppsala universitet,Institutionen för kärn- och partikelfysik,Tillämpad kärnfysik (author)

Tomography for partial-defect verification : experiences from measurements using different devices

  • Article/chapterEnglish2006

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  • 2006
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:uu-91654
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-91654URI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype

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  • Three devices of different types have been used in tomographic measurements for the purpose of partial-defect verification on the single-rod level. The devices range from a laboratory device used in measurements on a fuel model to an in-pool device used in measurements on irradiated fuel in a fuel-handling pool.The tomographic technique accounted for in this paper involves measurements of the gamma-ray flux distribution around a fuel assembly followed by computer-aided reconstruction of the internal source distribution. The results are rod-by-rod values of the relative concentrations of selected gamma-emitting isotopes. Also cross-sectional images are obtained.The tomographic technique presented here has proven to be robust and reliable. In laboratory experiments on a fuel model, reconstructions of relative rod-by-rod activities have been obtained with 1.5 % accuracy (1 σ). Using an in-pool device in measurements on fuel with a cooling time of about 4 weeks, data on fuel rods have been obtained in agreement with production-code calculations. Furthermore, tomographic images of good quality have been acquired.The applicability of the tomographic technique for partial-defect verification on the single-rod level has been investigated and demonstrated. The gamma-ray source concentration reconstructed in a position corresponding to a removed or replaced rod has been significantly lower than that of normal rods.Finally, requirements and properties of a device for tomographic measurements on nuclear fuel are discussed. It is argued that the use of a detector system with high energy resolution and high peak efficiency in connection to spectroscopic peak analysis is beneficial.

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  • Håkansson, AneUppsala universitet,Tillämpad kärnfysik (author)
  • Bäcklin, AndersUppsala universitet,Tillämpad kärnfysik (author)
  • Jansson, Peter,1971-Uppsala universitet,Institutionen för strålningsvetenskap(Swepub:uu)petejans (author)
  • Osifo, OtasowieUppsala universitet,Institutionen för strålningsvetenskap (author)
  • Willman, ChristoferUppsala universitet,Institutionen för strålningsvetenskap (author)
  • Uppsala universitetInstitutionen för kärn- och partikelfysik (creator_code:org_t)

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  • In:ESARDA Bulletin33, s. 15-250392-3029

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Jacobsson Svärd, ...
Håkansson, Ane
Bäcklin, Anders
Jansson, Peter, ...
Osifo, Otasowie
Willman, Christo ...
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NATURAL SCIENCES
NATURAL SCIENCES
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and Subatomic Physic ...
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ESARDA Bulletin
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Uppsala University

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