I do have a question..
Last year St Lucie replaced one of their Pressurizers. I believe they're the only utility to have done this.
I'm wondering how big a task was it?
Why did they do it?
And what special considerations were there?
Mike
Sorry I took so long to respond to your questions, but I was deep into an outage and had a broken computer...
I wrote the HP plans for removing the Pressurizer at St. Lucie. Yes, it was a First-Of-A-Kind evolution and was a very large task from an ALARA standpoint. The amount of piping that had to be removed and subsequently reinstalled (note I did not say replaced) was impressive. Although the pipe diameters did not compare to a S/G replacement the confined quarters, tight tolerances, and surrounding high rad piping that was not removed made the task rather daunting. Those issues combined with a significant number of welding problems during the reinstallation made for a lot of dose, frustration and a few issues I will not address here.
The main reason to replace the pressurizer was that it contained the last Alloy 600 in the RCS and the utility wanted it out. Of course there were other considerations, but this is not the place to go into those details. There is not near enough room here to go into all of the special considerations involved. Suffice it to say that there were many rather painful meetings along the way. For details you should contact the utility.
Like any FOAK evolution there were several things that did not go as planned, but the job was completed approximately on schedule. Given that I use my own name here, that is as much as I will say.