NukeWorker Forum

Reference, Questions and Help => Polls => Topic started by: Mike McFarlin on Mar 12, 2007, 02:40

Title: S/G replacement projects
Post by: Mike McFarlin on Mar 12, 2007, 02:40

Five to ten range.

Title: Re: S/G replacement projects
Post by: Mike McFarlin on Mar 16, 2007, 10:17

Most recent Comanche Peak.

Title: Re: S/G replacement projects
Post by: ageoldtech on Mar 17, 2007, 04:36

When I finish this one, it will be number 15. “Boy is I tired!”

Title: Re: S/G replacement projects
Post by: guppy on Mar 17, 2007, 11:26

Hey, are you counting each generator or each nuke unit?  I was on the first, Surry!!! (house operator). Then H. B. Robinson (nightshift containment checkpoint).

Title: Re: S/G replacement projects
Post by: ageoldtech on Mar 19, 2007, 09:44

Hi ya guppy, I was referring to the nuke units. My first was Turkey Point 81-82. I missed Surry, I was still in High School.

Title: Re: S/G replacement projects
Post by: Mike McFarlin on Mar 19, 2007, 10:25

Young whipper snapper...but you caught up, didn't ya?

Title: Re: S/G replacement projects
Post by: guppy on Mar 20, 2007, 02:08

Surry was tough.  Many mistakes made there since it was the first and there was no historical data to go to.  The S/G was cut out at the legs against the bowl.  It sat that way for (literally) months until the new S/G was lowered into place.  Then, guess what?  The legs had sagged due to their own weight and now it didn't line up.  "Cooper Heat" was brought in to heat the bottom of the legs and expand the metal on that side thus bending the legs back into position.  Along with S/G replacement, TMI mods had to be incorporated.  The outages lasted somewhere around 12 and 18 months for the 2 units.

H. B. Robinson was no hayride either.  The S/Gs were cut out at the tubesheet and the new ones were manually welded into place from the inside.  Bowls were layered with heat resistant blankets to protect the lead and lead blankets to reduce the exposure.  Welders were in airline respirators and short staytimes.  Did I mention that the S/G had to be heated while welding?  Many happy times on nightshift there.  Jumping the bowls for surveys and adjusting lead.  I think that outage was only 7 or 8 months.  How fast are they now?

Title: Re: S/G replacement projects
Post by: ageoldtech on Mar 20, 2007, 07:02

H. B. Robinson was no hayride either.  The S/Gs were cut out at the tubesheet and the new ones were manually welded into place from the inside.  Bowls were layered with heat resistant blankets to protect the lead and lead blankets to reduce the exposure.  Welders were in airline respirators and short staytimes.  Did I mention that the S/G had to be heated while welding?  Many happy times on nightshift there.  Jumping the bowls for surveys and adjusting lead.  I think that outage was only 7 or 8 months.  How fast are they now?
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I remember HB Robinson 1984; I was there for 2 years. I think the actual outage was 11 1/2 months “that was a money maker.”
I’m doing the ALARA thing at Comanche Peak right now, we are in outage day 23 and all 4 new S/G are set in place, RCS welding is in progress. We should shoot a flush RT on # 3 RSC cold leg tonight. At this pace we could come in under 60 days which would be a world record for a four loop Westinghouse. Yes, they are getting very fast!