The necessity of steam generator high capacity blowdown operation for KSNP

High capacity blowdown concept is applied in steam generator design for Korea Standard Nuclear Power Plant (KSNP) to remove sludge on tubesheet before solidification. NSSS system design adopted the operation mode as one of performance related design basis events, and proved that no adverse results happen such as reactor trip during high capacity blowdown operation. But KEPCO don't want to perform the operation for fearing of power reduction and the possibility of reactor trip due to SG level fluctuation. This report presents the performance analysis results for KSNP and the operation data for PVNGS related with the operation, to confirm the necessity of high capacity blowdown operation. (author)