Monitoring of Axial and Radial Creep of Coolant Channels in Operating PHWRs

Expansion of coolant channels due to creep and growth is one of the major life limiting parameters of coolant channels in Pressurized Heavy Water Reactors (PHWRs). The environment of high stress, temperature and neutron irradiation causes axial and radial creep in pressure tubes. Creep monitoring of coolant channels is required to be done periodically in PHWRs as part of life management program for coolant channels. Axial and Radial creep measurement techniques ha e been developed by Refuelling Technology Division (RTD), Bhabha Atomic Research Centre (BARC) and successfully implemented in Indian PHWRs.