Abstract
In assuring light water reactor safety, it is vital to have confidence that no leaks or breaks will develop in the reactor pressure vessel and associated piping, which together constitute the primary coolant circuit. Initially small defects in these thick steel components can grow under the stresses arising from repeated pressure and temperature changes and the embrittlement of the metal caused by the radiation emanating from the reactor core. Ultrasonic testing is widely used for detecting, locating and sizing flaws in primary circuit elements at various stages of plant life. The successive PISC projects have constituted the most notable sustained international effort to assess the effectiveness of these inspection techniques. The Plate Inspection Steering Committee (PISC I) programme (1976–1980) was intended to establish the capabilities of the 1974 ASME Code Section XI ultrasonic procedure. The Programme for the Inspection of Steel Components (PISC II, 1981–1986) constitutes a more profound evaluation of the best performance obtainable by modern ultrasonic techniques under optimal conditions.
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