Failure Analysis and Failure Prevention in Electric Power Systems:First Annual Progress Report

摘要

Six technical tasks have been identified as necessary to achieve the program goal of increased reliability and safety of electric power plants. Analysis of past operating and malfunction experience (Task I) has been used to identify problem areas which are potentially hazardous or costly and which should be subjected to detailed engineering analysis (Task II) or simulation tests (Task V). Input data on the, actual environment and loading (Task III) and on the materials and structural properties (Task IV) have been obtained, and specific engineering analyses have been performed. Tasks I-V have provided a quantitative basis for developing improved failure prediction and prevention programs (Task VI). The analyses completed include flaw indictions in the nozzle to shell weld of the Pilgrim 1 vessel, a corner crack in the nozzle of a test pressure vessel, a crack in a butt weld under the influence of residual stresses, and flaws in the near bore area of steam turbine rotors.