Quick Look inspection: report on the insertion of a camera into the TMI-2 reactor vessel through a leadscrew opening

The purpose of the insertion of a camera into the reactor vessel through a leadscrew opening, known as the Quick Look, was to visually inspect a portion of the plenum and fuel inside the TMI-2 reactor vessel in order to make an assessment of their condition. This was accomplished by uncoupling the center control rod drive mechanism (CRDM) leadscrew from the control rod assembly and removing the leadscrew from the CRDM, resulting in an access path to a plenum guide tube and to the core region. This report describes the preparations and plant modifications required to accomplish this Quick Look. Additionally, the report summarizes the containment entries, data collected, and the observations from the camera inspections. As a result of the Quick Look, two general conclusions can be made: (a) although a significant amount of debris was observed, plenum distortion was not apparent, and (b) the top center of the core was observed in the form of a loose rubble bed approximately 5 feet below the design location