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Modelling Cherenkov light from irradiated nuclear fuel assemblies using GEANT4
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Nuclear Fuel Diagnostics and Safeguards)
Uppsala University, Disciplinary Domain of Science and Technology. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Nuclear fuel diagnostics and safeguards)
Lens-Tech AB, Skellefteå, Sweden.
Uppsala University, The Svedberg Laboratory.
2010 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The Digital Cherenkov Viewing Device (DCVD) is currently used by International Atomic Energy Agency (IAEA) inspectors for gross defect verification of spent nuclear fuel assemblies in storage pools. A Cherenkov light image is obtained from the spent fuel and the verification is made by the detection of unique Cherenkov characteristics of spent fuel. To take further advantage of its quantitative capabilities, the DCVD’s ability to detect partial defects down to the 30% level is now being investigated.

To evaluate the performance of the DCVD, simulations of the emitted and recorded light can be very useful. This presentation describes how the software toolkit GEANT4 is used to gain better understanding of the light contributions from the fuel and its environment by means of Monte Carlo simulations. The toolkit allows the user to access information on individual photon emission coordinates and their momentum vectors and it is also possible to take the expected rod-by-rod burnup distribution at different axial levels into account.

Investigations have shown that the Cherenkov light production about the fuel is dominated by gamma radiation from the fuel material interacting with the water surrounding the fuel. A study of the range of the Cherenkov photon production from individual fuel rods, which is of relevance for partial-defect verification, is presented. In addition, emission distributions of Cherenkov light are presented for simulated PWR fuel assemblies with different configurations of replaced rods. Simulated light intensities in guide tubes are presented, showing variations depending on whether fuel rods nearby have been substituted or not.

Place, publisher, year, edition, pages
2010.
Keyword [en]
DCVD, Cherenkov light, GEANT4, nuclear fuel
National Category
Subatomic Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-146742OAI: oai:DiVA.org:uu-146742DiVA: diva2:398876
Conference
The IAEA Symposium on International Safeguards, Vienna, Austria, November 1-5, 2010
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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