Transition boiling heat transfer data from Semiscale Mod-3 gravity feed reflood experiments have been compared to existing transition boiling correlations. The existing correlations were found to be inadequate for predicting the Semiscale rod bundle data; therefore, a new correlation for transition boiling was developed. The new correlation is applicable for boiling water with stainless steel, electrically heated vertical rods in a pressure range of 138 to 414 kPa. When the new transition boiling correlation is combined with the Berenson film boiling correlation, a good fit to Semiscale reflood data results.