Marowen Ng - Academia.edu (original) (raw)

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Research paper thumbnail of Method of forming via holes

Research paper thumbnail of Hydride fuel behavior in LWRs

Journal of Nuclear Materials, 2005

The U-Zr hydride U 0.31 ZrH 1.6 offers a number of advantages over oxide fuel for light-water rea... more The U-Zr hydride U 0.31 ZrH 1.6 offers a number of advantages over oxide fuel for light-water reactors. Fission-gas release appears to be very small (release fraction $10 À4 ) up to 600°C, which is close to the maximum fuel temperature. Initial irradiation-induced swelling can be as large as 5% for temperatures exceeding 650°C. Hydrogen redistributes due to the non-uniform temperature in the fuel from the as-fabricated H/Zr of 1.6 to one that is higher at the pellet periphery than at the centerline. Radial redistribution produces ÔhydrogenÕ stresses in the pellet which add to the usual thermal stresses. In a helium-bonded fuel rod, the total stresses are less than the fracture stress; in a liquid-metal-bonded fuel rod, the fracture stress is exceeded in the central portion of the pellet, but the surface remains in compression. Axial redistribution moves substantial quantities of hydrogen from the middle portion of the fuel stack to the ends. The neutronic effect of this displacement of the moderator is unknown.

Research paper thumbnail of Method of forming via holes

Research paper thumbnail of Hydride fuel behavior in LWRs

Journal of Nuclear Materials, 2005

The U-Zr hydride U 0.31 ZrH 1.6 offers a number of advantages over oxide fuel for light-water rea... more The U-Zr hydride U 0.31 ZrH 1.6 offers a number of advantages over oxide fuel for light-water reactors. Fission-gas release appears to be very small (release fraction $10 À4 ) up to 600°C, which is close to the maximum fuel temperature. Initial irradiation-induced swelling can be as large as 5% for temperatures exceeding 650°C. Hydrogen redistributes due to the non-uniform temperature in the fuel from the as-fabricated H/Zr of 1.6 to one that is higher at the pellet periphery than at the centerline. Radial redistribution produces ÔhydrogenÕ stresses in the pellet which add to the usual thermal stresses. In a helium-bonded fuel rod, the total stresses are less than the fracture stress; in a liquid-metal-bonded fuel rod, the fracture stress is exceeded in the central portion of the pellet, but the surface remains in compression. Axial redistribution moves substantial quantities of hydrogen from the middle portion of the fuel stack to the ends. The neutronic effect of this displacement of the moderator is unknown.

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