PROCEDURE TO CONTROL LEAKS DURING VAPOR GENERATION IN A WATER REACTOR SYSTEM UNDER PRESSURE, AND THE CORRESPONDING VAPOR GENERATOR.

摘要

To control leaks between primary and secondary circuits of a steam generator (52) of a pressurised water reactor system, pressure equalisation is brought about by shutting off a live steam line (78) and feedwater line (74) connected to the secondary circuit of the steam generator (52) and by increasing the pressure in the resulting isolated secondary circuit by the injection of steam. For a U-type steam generator (52) in which there is a secondary steam space (72) between the top of the tubes (54) and the top of the steam generator, the secondary liquid level (82) is maintained above the top of the tubes (54) and the steam is injected (86) into the secondary steam space (72) to prevent contact of the steam with the tube walls and the resulting condensation of steam that would thus occur.