A lifecycle management program, for turbine balance of plant of light water reactor units, was proposed and implemented from the view point of system and equipment supplier to secure the high availability factor throughout the long intended residual lifetime. The program consists of unit surveillance analyzing operation and inspection data, degradation assessment for the equipment and prospecting for the future by appropriate measures to address the issues over the units based on both technical and economical criteria. The surveillance revealed the issue that the generating power would be adversely affected by main steam pressure reduction due to the scale adhesion to SG tubes. The prospect for the unit future was presented as an alteration of the water treatment to HAVT accompanied with optimum design for the replacement of the auxiliary heat exchangers of MSR and feedwater heaters.

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