Steam generator level controllability

Abstract

The steam generators used in the CANDU PHWR system are exposed to operating transients considerably more rapid than those in PWR systems. These transients include power increases at rates as high as 1% per second and rapid power run-back from full load to 60%. The paper reviews the development of the water level control philosophy for the CANDU steam generators. In particular, it compares the design and commissioning experience of the Point Lepreau G.S. and the Bruce G.S. "B" units and discusses the application of that experience to the design of subsequent units.