Dear Conco;
 
I have a success story for our recent outage at Calvert Cliffs Nuclear Power Plant. The success is for the work Conco did cleaning the Unit 1 condensers.  Conco utilized TruFit™ tube cleaners on 49,000 tubes (8,250 per waterbox) and did not lose a single cleaner in the process.  They developed and implemented a method to ensure any dropped cleaners would not fall below the waterbox inlet screen.   It is not uncommon to lose cleaners during this process, and I don't recall an outage that we didn't lose a few. Zero loss is a great job. Conco also implemented a new tube cleaner counting system that minimized the human performance risk of counting 8,250 scrapers by hand after each waterbox is cleaned.   Conco's capture method will be used by Calvert Cliffs Nuclear for future waterbox tasks, where loss of small items may be a concern. 
 
Conco also exhibited very strong ownership when they noted two areas of concern inside the waterboxes that were outside their scope of work.   They noted possible tube sag in the 11A titanium tubes and noted some tubesheet coating damage in 13B waterbox.  Neither of these issues is significant for Calvert Cliffs as the titanium tubes are staked mid-span due to the lighter wall thickness vs. SS tubes and the coating damage will be repaired under the coating inspection and repair program.   But this shows great ownership and engagement with the welfare of Calvert Cliff's equipment by Conco. 
 
 
 
Sincerely,
 
Paul Gray
Principal Engineer
Calvert Cliffs Nuclear Power Plant