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Tomography for part...
Tomography for partial-defect verification : experiences from measurements using different devices
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- Jacobsson Svärd, Staffan (author)
- Uppsala universitet,Institutionen för kärn- och partikelfysik,Tillämpad kärnfysik
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- Håkansson, Ane (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Bäcklin, Anders (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Jansson, Peter, 1971- (author)
- Uppsala universitet,Institutionen för strålningsvetenskap
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- Osifo, Otasowie (author)
- Uppsala universitet,Institutionen för strålningsvetenskap
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- Willman, Christofer (author)
- Uppsala universitet,Institutionen för strålningsvetenskap
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(creator_code:org_t)
- 2006
- 2006
- English.
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In: ESARDA Bulletin. - 0392-3029. ; 33, s. 15-25
- Related links:
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https://urn.kb.se/re...
Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Keyword
- tomography
- Applied Nuclear Physics
- Tillämpad kärnfysik
- Fysik med inriktning mot tillämpad kärnfysik
- Physics with specialization in Applied Nuclear Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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