Key conceptual features are developed for a passive light water cooled and moderated pressure tube reactor having a total thermal output of 4029 MW(thermal) and net electric power of 1260 MW(electric), compatible with passive safety features that can ensure integrity of the fuel and reusability of the major reactor components without the requirement of delivery of emergency coolant makeup inventory. The concept of passive heat removal applied in this design combines heat storage, thermal conduction, radiation, natural circulation of light water in a moderator system under one atmosphere, and a natural draft air cooling system. Feasibility studies concerning normal heat transport, accident decay heat removal, materials compatibility, and reactor physics for criticality and feedback effects were carried out for the associated design features. The basic feasibility of the subject concept was confirmed by these analyses.