Letter to the editor on “Evaluation of subcooled critical heat flux correlations for tubes with and without internal twisted tapes” by F. Inasaka and H. Nariai and “Consideration of CHF margin prediction by subcooled or low quality CHF correlations” by P.

Some comments are presented concerning CHF correlations which have the property MCHFR = MCPR and on the limitations of our knowledge of how to apply such models to three dimensional situations and rapid transients.