Method for the integral replacement of a steam generator by a pressurized-water nuclear reactor

摘要

The method consists in separating the worn-out steam generator (1) from the primary circuit, by sectioning the pipes (3, 5) in the vicinity of the steam generator pipework, withdrawing the worn-out steam generator, placing a replacement steam generator in position and welding the pipe work of the replacement steam generator to the primary pipes (3, 5). Topometric measurements are carried out on the replacement generator, on the worn-out steam generator (1) in position in its compartment (11) and in the compartment (11) after the removal of the worn-out generator (1). Comparison of the topometric measurements enables the replacement procedure to be determined, i.e., the number of cuts to be made on the primary pipes (3, 5), the modifications to be made to the supporting and positioning devices (8, 17) and the position of the chamfers for welding the pipes (3, 5) and the pipework of the replacement steam generator.