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Abstract

As a result of meetings of the Committee on Safety of Nuclear Installations, Principal Working Group 3, Primary Circuit Integrity, Task Group on NDE Reliability, it was decided that a RRT on stainless steel (SS RRT) was needed to address the issue of NDE inspection reliability for nuclear reactor piping and components. Furthermore, it was realized that to answer the overall question of reliability, a major study has to be undertaken. In the PISC III Programme, it was decided to approach this problem by using a two phase procedure. First, start a pilot test immediately using available specimens and second, initiate planning for a much more in-depth program. This report deals with the first step that was taken for immediately beginning a pilot round robin test. The specimens that were available to start a round robin activity were centrifugally cast stainless steel (CCSS) pipe segments. These pipe segments each contained a weld and were approximately 400 m long by 190 mm wide by 60 mm thick. The specimens contained laboratory induced thermal fatigue cracks while a few had no cracks. 18 teams from Europe and the United States participated in this study. All of the inspection techniques employed were ultrasonic except for one radiographic technique using a linear accelerator. As expected, the laboratory induced thermal fatigue cracks in the centrifugally cast stainless steel specimens were difficult to inspect. Few teams only showed an ability to discriminate between cracked and uncracked test specimens.

Additional information

Authors: DOCTOR S BATTELLE, RICHLAND (USA) JEHENSON P JRC ISPRA , BATTELLE, RICHLAND (USA);JRC ISPRA
Bibliographic Reference: SMIRT POST CONFERENCE SEMINAR NO. 3, DAVOS (SWITZERLAND), AUG. 26-27, 1987 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33425 ORA
Availability: Can be ordered online
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