The U.S. Nuclear Regulatory Commission (NRC) has encouraged utilities to perform their own safety analyses to support reload applications, technical specification amendments, etc., to significantly improve their understanding of plant behavior. During the meetings of the Advisory Committee on Reactor Safeguards on the Wolf Creek project, Kansas Gas and Electric Company (KG&E) was urged to develop “a strong in-house capability for analyzing and understanding the nuclear-thermal-hydraulic behavior and systems performance.” KG&E fully intends to develop a strong in-house analytical capability and responded as such to the NRC. Part of this in-house analytical capability will be provided through the Safety Analysis Section. The development and application of system analysis is an integral part of the Safety Analysis Section. The development phases of achieving in-house system analysis capability are discussed. They include intermediate and long-term goals, a technical review of all non-loss-of-coolant accident transients performed by Westinghouse in Chap. 15 of the Final Safety Analysis Report, and the development of RETRAN system analysis models. Applications of system analysis are also discussed. Applications include an analysis of the plant loss-of-flow startup test to relax the acceptance criteria and a joint effort with Union Electric to reanalyze the steam generator tube rupture event for the NRC licensing commitment.