The disassembly phase of Ontario Power Generation's refurbishment of Darlington unit 3 has now been completed and the reassembly phase has begun, the company said yesterday. The disassembly of the reactor included the world's first use of a combined pressure and calandria tube removal technique. Separately, an automated process to install and inspect calandria tubes is to be used in the refurbishment of Bruce Power's Bruce 3 in another industry 'first'.