本研究以核能電廠反應爐跳脫系統的建置實例，包括主要、後備與手動等三部分之反應爐跳脫功能，進行軟體需求與設計階段發展測試研究。主要反應爐跳脫功能之輸入採用窄幅水位與頂壓力，以四選二邏輯運算決定是否跳脫反應爐；後備反跳脫功能之輸入採用寬幅水位與中子通率，以三選二邏輯運算決定是否跳脫反應爐；手動功能採用二組開關並聯，當其皆通路時執行跳脫反應爐。軟體發展過程之需求階段，以架構圖說明系統與軟體功能需求；在設計階段以功能邏輯圖，說明相關軟體功能設計細部資料。此研究成果提供確保軟體發展在各階段文件正性之方法，及具可追溯審查實際參考範例。

In this study, the development of software requirement and design phases is investigated by implementing a Reactor Trip System (RTS) with Primary, Backup and Manual Reactor Trip Functions. The inputs of Primary system are four Manual Reactor Trip Functions. The inputs of Primary system are four divisions incorporated with twodivisions incorporated with two divisions incorporated with two divisions incorporated with two-outoutout-of-four voters and these inputs are narrow-ranged analog signals of water level and neutron flux to determine the triggering to the reactor function. With similar configuration, the inputs of Backup Reactor Trip include are wide-ranged analog signals of water level and neutron flux to determine the triggering to the reactor trip function as well. Accordingly, Manual Reactor Trip comprises two manual switches connected in parall and it will be triggered when both of the switches are opened. In the requirement phase to software development, architecture diagram describes the functions of system. In design phase, logic architecture diagram describes the functions of system. This study provides researchers with a practical approach to ensure the appropriatenenss of documents in all phases of software development, and demonstrates traceable materials for document review.