Performance evaluation of KANUPP steam generators for operating them during plant life extension

After completing its design life of 30 years in 2002, KArachi NUclear Power Plant (KANUPP) has embarked on a further journey of 15 years under Plant Life Extension (PLEX) program. To complete this journey safely and successfully, necessary safety and equipment upgrades were implemented in 2003 and 2004, critical equipments have been identified and their performance is being monitored. Being critical component of a nuclear power plant, Steam Generators have significant contribution in station unavailability. KANUPP Steam Generators are not immune to degradation. Their design and tube material have led to some unexpected challenges. However, remedial actions, and careful proactive maintenance activities, have resulted in decrease in Steam Generator-related station unavailability at KANUPP. The paper focuses on proactive identification of potential degradation mechanisms for various components of KANUPP Steam Generators, short-term and long term strategies for inspection, maintenance and design modifications pertaining to effective Life Cycle Management Plan (LCMP) necessary for the safe and reliable operation of KANUPP during the plant design life and beyond. (author)