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Non-destructive experimental determination of the pin-power distribution in nuclear fuel
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics. Kärnfysik.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics. Kärnfysik.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics. Kärnfysik.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics. Kärnfysik.
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2003 (English)Conference paper, Published paper (Other academic)
Abstract [en]

A need for validation of modern core-analysis codes with respect to the calculated pin-power distribution has been recognized. A non-destructive experimental method for such validation has been developed, based on a tomographic technique. Each axial node of the fuel assembly is measured separately and the relative pin-by-pin content of the direct fission product Ba-140 is determined. Investigations performed so far indicate that 1-2% (1 σ) accuracy can be obtained.

A measuring device has been constructed which, when fully equipped, is designed to measure a complete BWR assembly in 25 axial nodes within an eight-hour work shift. The applicability of the constructed device has been demonstrated in measurements at the Swedish BWR Forsmark 2 on irradiated fuel with a cooling time of 4-5 weeks. Data from the core-analysis code POLCA-7 have been compared to measured pin-by-pin contents of Ba-140. An agreement of 3.1% (1 σ) has been demonstrated.

As compared to the conventional method, involving gamma scanning of individual fuel pins, this method does not require the fuel to be disassembled. Neither does the fuel channel have to be removed. The cost per measured fuel pin is in the order of 20 times lower than the conventional method.

Place, publisher, year, edition, pages
2003.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-77504ISBN: 0-89448--670-5 (print)OAI: oai:DiVA.org:uu-77504DiVA: diva2:105416
Conference
Advances in Nuclear Fuel Management III
Available from: 2006-03-15 Created: 2006-03-15 Last updated: 2015-01-27

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Jacobsson Svärd, StaffanHåkansson, AneBäcklin, AndersOsifo, OtasowieWillman, ChristoferJansson, Peter

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Jacobsson Svärd, StaffanHåkansson, AneBäcklin, AndersOsifo, OtasowieWillman, ChristoferJansson, Peter
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