Assessment of the capability of the existing heat transfer data base and of designated data sources to privide data over the calculated heat transfer variable ranges during a LOCA blowdown

Data for transition boiling, film boiling and critical heat flux are compared to code calculated heat transfer variable ranges to determine whether the data are sufficient to support the calculations during the blowdown phase of a postulated loss of coolant accident. The data were selected from the Heat Transfer Data Bank. RELAP4/MOD5, RELAP4/MOD6 and TRAC-P1 calculated heat transfer variables of mass flux, pressure, quality, heat flux, and surface temperature are used in the study for the core and steam generator components of PWR and Semiscale systems. The various heat transfer regimes used by the codes for the core and steam generator are determined and a comparison of the usage is presented. Test facilities designated to provide heat transfer data during blowdown are evaluated with respect to their capability to provide data for heat transfer correlation development and testing. Conclusions and recomendations concerning the calculated heat transfer variable ranges and the data are presented