According to "Chinese Power station steam&water pipe stress analysis technical rules"(SDGJ6-90),We must consider the force&moment acting on the equipment when "relaxation cold state case" happen.The "relaxation cold state case" as following:
After pipe has run for ages(long time),then when we want to overhaul boiler or turbien,so the pipe's temperature should change from hot to cold.After pipe has been cooled,there should be force&moment acting on the equipment,but this force&moment is not equal to initial cold state(just before first running,it's CEASAR'S SUS case).Maybe force&moment in relaxation cold state case should be more than force&moment in SUS case,but how can we combine the relaxation cold state case to meet our requirement by CEASAR2?
As far as know,the GE company and HITACHI company are all considering this case,and there are some design department in USA(as A/E,EBASCO) consiedring this case too.But we do not know if they use CEASAR2.
Thanks for your attention!