Abstract
A practical formula for inferring the λ-mode eigenvalue separation from flux tilt measurements is derived. The advantages of the present formula consist in both the generality and the simplicity of data-analysis, even under a higher-order model, compared with the previous expressions. The applicability of the method, based on the first-order version of the formula, is confirmed by the demonstration in the UTR-KINKI reactor. The results indicate that the flux distortions induced by the asymmetric pattern of control rods are not spatially local but global, which is responsible for the dominant excitation of the first harmonics, consequently the analysis is successful in the extraction of the first-mode eigenvalue separation. The effects of higher-harmonics past the first on the first-mode eigenvalue separation, which is neglected in the previous formula, are also evaluated.
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