Main Steam Flow Nozzle Installed Backwards
Main Steam Flow Nozzle Installed Backwards
(OP)
During shearwave testing a weld-in stainless steel flow nozzle in a 12" S160 P91 main steam line we identified a defect in the pipe upstream of the flow nozzle (which was installed backwards). The defect could not be charachterized with the shearwave equipment, but it appeared to be approx 2/10" deep, not in a straight line and continuous half way around the pipe on the bottom side. At 1725 psi and 1004F, do you think it warrants further investigation? What might be the cause of the defect?





RE: Main Steam Flow Nozzle Installed Backwards
RE: Main Steam Flow Nozzle Installed Backwards
RE: Main Steam Flow Nozzle Installed Backwards
p.s. I always wanted to make a trip to the site when they did the "blow down" of those main steam lines, never did make it though.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Main Steam Flow Nozzle Installed Backwards
RE: Main Steam Flow Nozzle Installed Backwards
There is no way to use UT to identify the cause, only the size of the indication.
Video probe is your best bet now.
Fix this soon.
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Plymouth Tube
RE: Main Steam Flow Nozzle Installed Backwards