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Cladding thickness of the Westinghouse standard fuel design (STD) and optimized fuel design (OFA) is increased.
The ARR is a 500 MWe (1180 MWth) oxide fueled sodium cooled fast reactor, which the low core height of 70 cm and the large structure volume fraction with 1.0 mm of cladding thickness to tube wall have been chosen among 14 candidate concepts to reduce the TRU conversion ratio (CR) and the void reactivity, taking technology readiness into account.
The total diameter of the fibers was 152 µm with cladding thickness of 12 µm.
The resulting analysis indicates that significant stresses develop after a modest neutron dose (∼1 dpa) and a pronounced variation across the cladding thickness exists and is opposite to that observed for metallic cladding structures where swelling or growth strains are either negligible (with small temperature dependence) or absent.
To push further our investigations, the influence of the cladding thickness, i.e., the loading-strip layer, was also studied on a test sample coated in the same batch.
The calculated stresses along the cladding thickness show a high sensitivity to the assumptions regarding material properties.
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Effect of metal thickness and cladding layer thickness on the core mode and surface plasmon mode has been analyzed in detail.
b Effective indices of the fundamental and the first order TM slab modes of the horizontal slot waveguide for different cladding thicknesses.
Variations of the relations between effective indexes and the structure parameters include the width, height and thickness of ridge waveguide and the upper and lower cladding thicknesses are analyzed by the effective index method (EIM).
A significant variation in the clad thickness was observed across the entire length of the tracks.
Different combinations of fuel rod pitch, fuel pellet diameter, and clad thickness that resulted in lower power peaking factor and enhanced multiplication factor are analyzed.
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