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Evaluation of Fuel Assembly Bow Penalty Peaking Factors for Ringhals 3: Based on a Cycle Specific Core Water Gap Distribution
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In recent years, fuel assembly bow in Ringhals 3 has started to increase again after lower levels of bow. Normally, the fuel assemblies are straight axially. One of the consequences of fuel assembly bow is perturbed power distribution across the core, resulting in smaller margins of safety during operation. A way of ensuring safe operation is add-on margins, penalties, dependent on bow amplitude, added to the power peaking factors. A new method of producing these penalties, based on realistic water gap distribution derived from measurements, was used.

By comparing the new penalties with the currently used penalties, the currently used penalties were concluded to be around 10 percent smaller for both FdH, the radial power peaking factor penalty, and FQ, the local power peaking factor penalty. The currently used penalties hence are significantly lower.

However, the conclusion should be seen as an indication, rather than directly implementable, since there is potential to evolve the method further and eliminate sources of error.

Place, publisher, year, edition, pages
2017. , p. 48
Series
UPTEC ES, ISSN 1650-8300 ; 17 037
Keywords [en]
Nuclear Fuel, Bow Penalty, Peaking Factors, Ringhals 3, Core Water Gap Distribution
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-336626OAI: oai:DiVA.org:uu-336626DiVA, id: diva2:1166550
External cooperation
Vattenfall Nuclear Fuel
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2017-12-18 Created: 2017-12-15 Last updated: 2017-12-18Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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