By: Stephen Parker and Eric Houston
SI has developed a process to mitigate the negative outcomes of piping examination. One part of that process is Thinning Handbooks, which have resulted in direct savings in excess of $10 Million for one nuclear plant.
Examination of Safety Related Service Water piping is driven by a number of factors, all of which tend to converge on the objective of finding localized thinning prior to the thinning becoming a problem. In other words, examinations are performed to eliminate the risk of a leak and ensure that the wall thickness remains greater than tmin (the minimum required uniform wall thickness). However, the rules, regulations, and economic realities mean that only bad things happen from an exam regardless of what is found.