Abstract
A basic solution for in-reactor sag of horizontal pressure tubes is proposed in accordance with a nonlinear anisotropic creep theorem. As an example, numerical solutions for in-reactor sag of cold-worked zircaloy-2 pressure tubes supported at the ends only are given for various combinations of anisotropy coefficients. It is shown that an isotropic analysis may overestimate or underestimate the deflection due to sag by about 100 percent if hoop creep rates are about 50 percent smaller or larger than longitudinal creep rates.
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