Heat transfer correlations, most of them incorporated in the heat transfer packages of the nuclear reactor safety computer programmes RBLAP-5, TRAC (PP1) and NORA have been tested against a relevant set of transient and steady-state experiments. In addition to usually measured parameters the calculations provided information on other physical parameters. Results are presented and discussed. The report consists of a main report (Vol.I) and appendices (Vol.II). Chapters 3,4 and 5 of the main report are primarily intended for computer programme users. Chapter 6 is recommended for those looking for main results rather than details. The appendices will be useful for computer programme developers.