Improvement of Steam Generator Model for DSNP with Two-Region Tube Bundle Model for CANDU Transient Simulation

2영역 튜브모텔을 고려한 CANDU 시뮬레이션용 DSNP 증기발생기 모델 개선

An improved steam generator model has been developed for the DSNP simulation of normal operational transient behavior of CANDU nuclear power plant. For more realistic prediction of steam generator behavior during transient, tube bundle region is divided into two separate control volumes, subcooled region and saturated region, and the variation of thermal hydraulic properties in the control volume is accounted for more realistic estimates of outlet enthalpy of each control volume. Test results for typical CANDU operational transient case show reasonable transient behavior of steam generator with overall CANDU operation and improved operational characteristics of steam generator with power variation.