Method for internal inspection of a pressurized water nuclear reactor pressure vessel.

摘要

A method for in-service inspection of a surface area especially welds of a nuclear reactor pressure vessel (3) is carried out, without removal of the core barrel and lower internals from the reactor vessel (3) by inserting inspection tools through apertures (63) found in the core barrel flange (23) into the annular chamber (47) between the core barrel (21) and the pressure vessel wall (5).