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Verification of completeness of spent nuclear fuel assemblies by means of tomography
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Nuclear fuel diagnostics and safeguards)
Vattenfall Power Consultant AB.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Nuclear fuel diagnostics and safeguards)
2008 (English)In: International Conference on the Physics of Reactors: Nuclear Power: A Sustainable Resource, Switzerland: Paul Scherrer Institute , 2008Conference paper, Published paper (Other academic)
Abstract [en]

Within the safeguards regime, new technologies are desired to allow for detection of possible diversion of individual fuel rods from an irradiated nuclear fuel assembly.

A measurement technique, based on Single-Photon Emission Computed Tomography, has been developed and demonstrated on a SVEA‑96 BWR assembly, which had been irradiated for one power cycle at the Forsmark 2 NPP. Images of the assembly’s internal distribution of the gamma-ray emitting isotope 140Ba/140La have been obtained tomographically, without requiring the assembly to be dismantled. Image analysis has been applied and the capability to detect the removal of a single rod from the assembly centre has been demonstrated.

In addition, rod-activity reconstructions have been performed, involving detailed modelling of the gamma-ray transport through the fuel. An agreement of 3.1% (1 s) with data from the production code POLCA‑7 was demonstrated.

An inspection procedure is suggested where tomographic data is collected, online image reconstruction is performed and image analysis is applied, resulting in a preliminary statement of the assembly’s completeness less than a minute after the measurement is completed. In cases where the completeness is questionable, an off-line rod-activity reconstruction can be performed, resulting in highly accurate data without the need for additional measurements.

Place, publisher, year, edition, pages
Switzerland: Paul Scherrer Institute , 2008.
Keyword [en]
Tomography, nuclear fuel, safeguards, partial defect verification
National Category
Subatomic Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-146745ISBN: 978-3-9521409-5-6 (print)OAI: oai:DiVA.org:uu-146745DiVA: diva2:398897
Conference
PHYSOR 2008, Interlaken, Switzerland
Available from: 2011-02-20 Created: 2011-02-20 Last updated: 2011-02-21Bibliographically approved

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Jacobsson Svärd, Staffan

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