APPLICATION OF LIFE CYCLE COST ANALYSIS (LCCA) IN SELECTING ALTERNATIVE PROGRAMS TO REDUCE DERATING (CASE STUDY OF PLTU NAGAN RAYA)

• Main Author: Dwi Prabowo, Yulianto
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46189
• Institution: Institut Teknologi Bandung

PLTU Nagan Raya is a steam power plant with 2 x 110 MW installed capacity located in Aceh. As the biggest power plant in Aceh, PLTU Nagan Raya also have important role in Sumatera Utara electricity system. Recently, within derating, PLTU Nagan Raya requires improvement to maintain its optimal condition in term of cost, risk and performance. The purpose of this study is to perform an economic analysis toward derating and forced outage’s improvement programs by applying life cycle cost analysis (LCCA). In this research, the first approach is collecting forced outage historical data to recognise the equipments’ main problems. By using pareto loss output (PLO) diagram, it is known that unit 2 have greater outage which dominating by boiler tube leaks and refractory problems. The improvement programs grouped into five alternatives, then the data (forced outage hours) are processing within Weibull distribution approach’s software and Monte Carlo simulation. Its outputs are value of ?, ? and mean time to failure (MTTF), then calculated into the form of nett present value (NPV), total cost / benefit vs risk, and also performance indicators which are equivalent availability factor (EAF), equivalent forced outage rate (EFOR) and nett capacity factor (NCF) of each alternative program. Result of the research was found that alternative 5 (boiler pipe coating, refractory material’s modification and installing new last blade turbine) became a more effective choice. Alternative 5 has the largest nett present value (NPV), the lowest level of cost / benefit vs risk and cost of energy (CoE). In terms of performance, alternative 5 is a better choice with 86,44 % of EAF, EFOR of 15,22 % and electricity production ratio’s enhancement within 70 % of NCF. Based on the research, LCCA can be apply in selecting alternative programs to reduce power plant’s derating