This is a summary report on thc failure of the EBWR turbine blade. It includes a description of the turbine shutdown sequence, the investigation into the cause of vibration, the disassembly of turbine, and observations and conclusions concerning the cause of the blade failure. The cause of failure was traced to a fault in the holding fixture used during the machining operation. There was no indication that any adverse effect on the turbine, blades resulted from the fact that the steam came from a direct-cycle boiling water nuclear reactor power source.

The first two sections summarize investigations in EBWR concerned with some aspects of water chemistry. The results of many of these investigations have not been previously published in a form given wide distribution. Included are studies of water conditions, corrosion products (composition, activities, transportation, deposition, and distribution), water dissociation, water activity, fission-product release, and build-up of plant activity.