Some findings from long-term monitoring of displacement of nuclear power plant buildings

The deformation was measured of the turbo-set in the Dukovany nuclear power plant. Two methods were employed in investigating the deformation of the turbo-set rotary axis, viz., high precision geometric levelling and hydrostatic levelling. The effect is discussed of the environment on the results of the hydrostatic levelling and on measurement using the geometric levelling. Differences were found in the individual superelevation figures obtained using the two methods. The differences did non exceed 0.1 mm and were due to various external and internal conditions of the individual turbo-sets stemming from the fact that the measurements were not simultaneous. The determination of the turbo-generator deflection curves and the process of in-service measurement of turbo-set deformation are described. (E.J.)