Saturday, May 24, 2008
When the Steam Doesn't Stay in the Tube: Day 1
We have a tube leak in Unit 2, in the primary superheat section of the boiler. This is an area where the tube bundles are very close together, and the tubes are very close together. And there is a lot of pressure (~2500 psi) so when a tube fails it starts to cut it's friends nearby, and they cut their friends and it is a mess. To fix it you have to cut out a lot of tubes to get to in to the ones that have failed, and then weld your way back out again. We are looking at a minimum of 12 tubes that will need to be removed and replaced, and possibly as many as 20. So there goes the weekend.