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Diesel generator of nuclear power plant has a role for supply of emergency electric power to protect reactor core system in event of loss of off-site power supply. Therefore diesel generator should be tested periodically to verify the function that can supply specified frequency and voltage at design power level within limited time. For this purpose, appropriate maintenances in case that abnormal conditions were found are required in allowed time. In this paper, results of development of engine condition diagnosis technology and study on power plant of its technology for diesel generator are described. Key Words Diesel Generator, Abnormal Signature, Engine Condition, Pressure Curve, Exhaust Valve *†() : () E-mail : choikhi@khnp.co.kr, Tel : 042-870-5512 ** : ()  *†Kwang-Hee Choi(corresponding author) : Central ResearchInstitute, Korea Hydro & Nuclear Power Company, LTD.E-mail : choikhi@khnp.co.kr, Tel : 042-870-5512 **Sang-Guk Lee : Central Research Institute, Korea Hydro &Nuclear Power Company, LTD.

A Study on the Power Plant Application of Engine Condition Diagnosis Technology for Diesel Generator