The training and retraining courses for the reactor operators conducted at the Nuclear Training Center of Korea Atomic Energy Research Institute are recognized as an important part of securing nuclear safety in Korea. Courses on reactor systems for the KAERI engineers, especially those paticipating in YGN-3 and YGN-4 project are also considered to be very important. A textbook for these courses has been compiled and developed based on the Emergency Operations Procedure for Westinghouse nuclear reactors. This text is intended to be used for simulation exercises making use of the Compact Nuclear Simulator designed by KAERI and Studsvik. The course material in the textbook has also been built into the Compact Nuclear Simulator software in such a way that the students can use it interactively during reactor operation simulations. It will also help the students to be prepared themselves for various malfunctions causing reactor trips by following a set of CRT-displayed procedures. (Author).