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SECOND GENERATION SHIELDING ASSEMBLIES – NEUTRON FLUX IMPACT ON REACTOR PRESSURE VESSEL AND CORE DESIGN
Vattenfall AB.
Vattenfall AB.
Ringhals AB.
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In order to increase the protection of the reactor pressure vessel beltline weld against fastneutron flux a second generation shielding assemblies are planned to be designed and in-stalled in the nearest future at Ringhals 3 and 4. These assemblies might be designed withthree axial zones. The top and bottom zones contain low enriched 235U while the centralshielding part contains only steel rods. Different designs with varying 235U enrichment andlength of the central zone is studied in order to find a balance between the desired shieldingfactor at the beltline weld and core design feasibility. The most favorable design was foundto have 7 steel nodes (106.68 cm), 5 bottom nodes (76.20 cm) and 12 top nodes withstandard fuel rods containing 1.5 w/o 235U. This design results in an estimated shieldingfactor of 7.8 ± 0.7 and has small impact on cycle length and core design. The reducednumber of fuel pins due to the shielding steel zone will result in a FΔH penalty of 2.2 %.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Second, Shielding, Assemblies, Fluence, Reactor, Vessel.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-241650OAI: oai:DiVA.org:uu-241650DiVA: diva2:780481
Conference
PHYSOR 2014 – The Role of Reactor Physics Toward a Sustainable Future
Available from: 2015-01-14 Created: 2015-01-14 Last updated: 2015-01-14

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Bejmer, Klaes-Håkan

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