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/44173

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 condition, PLTU Nagan Raya requires improvement to maintain its optimal 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 three alternatives, then the data (forced outage hours) are processing within Reliasoft Weibull++ 6 th version’s software and Monte Carlo simulation. Its outputs are 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 3 (boiler pipe coating and refractory material’s modification) became a more effective choice. Alternative 3 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 3 is a better choice with 81,23 % of EAF, EFOR of 20,89 % and electricity production ratio’s enhancement within 78 % of NCF.