Research Papers

Effects of the Foil Flatness on Irradiation Performance of U10Mo Monolithic Mini-Plates

[+] Author and Article Information
Hakan Ozaltun

Fuel Modeling and Simulations,
Idaho National Laboratory,
P.O. Box 1625, MS 3818, Idaho Falls, ID 83415
e-mail: hakan.ozaltun@inl.gov

Pavel G. Medvedev

Fuel Performance and Design,
Idaho National Laboratory,
P.O. Box 1625, MS 3818, Idaho Falls, ID 83415

Barry H. Rabin

Fuel Performance and Design,
Idaho National Laboratory,
P.O. Box 1625, MS 2211, Idaho Falls, ID 83415

1Corresponding author.

Manuscript received April 2, 2015; final manuscript received June 12, 2015; published online September 3, 2015. Assoc. Editor: Jovica R. Riznic.

ASME J of Nuclear Rad Sci 1(4), 041003 (Sep 16, 2015) (7 pages) Paper No: NERS-15-1045; doi: 10.1115/1.4030982 History: Received April 02, 2015; Accepted July 02, 2015; Online September 03, 2015

Monolithic plate-type fuels comprise a high-density, low-enrichment, U10Mo fuel foil encapsulated in a cladding material. This concept generates several fabrication challenges, including flatness, centering, or thickness variation. There are concerns whether these parameters have implications on overall performance. To investigate these inquiries, the effects of the foil flatness were studied. For this, a representative plate was simulated for an ideal case. The simulations were repeated for additional cases with various foil curvatures to evaluate the effects on the irradiation performance. The results revealed that the stresses and strains induced by fabrication process are not affected by the flatness of the foil. Furthermore, fabrication stresses in the foil are relieved relatively fast in the reactor. The effects of the foil flatness on peak irradiation stress-strains are minimal. There is a slight increase in temperature for the case with maximum curvature. The major impact is on the displacement characteristics. While the case with a flat foil produces a symmetrical swelling, if the foil is curved, more swelling occurs on the thin-cladding side and the plate bows during irradiation.

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Fig. 1

Fission density, L2AR

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Fig. 2

Mini-plate dimensions that were used for the model

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Fig. 3

Geometric model and FE discretization

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Fig. 4

Schematics for the foil flatness study

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Fig. 5

Plate displacement profiles: (a) cladding front surface and (b) cladding back surface

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Fig. 6

Final plate displacements at the shutdown: contours are showing (a) doffset=0.000  mm, flat foil case; (b) doffset=0.0635  mm, smallest curvature; (c) doffset=0.254  mm; and (d) doffset=0.397  mm, largest curvature

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Fig. 7

Fuel stresses: (a) peak magnitudes for various curvatures and (b) profiles at the midplane

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Fig. 8

Foil displacements: (a) peak magnitudes for various curvatures and (b) swelling profiles at the midplane

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Fig. 9

Cladding midplane evaluation: (a) equivalent stresses and (b) equivalent plastic strains

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Fig. 10

Equivalent stress fields for the cladding at shutdown: images are showing (a) flat foil case; (b) 0.0635-mm offset, smallest offset; (c) 0.254-mm offset; and (d) 0.397-mm offset, largest offset

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Fig. 11

Temperature profiles for the fuel and cladding: EOL profiles at the midplane




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