THE PROCEDURE FOR DETERMINATION OF SPECIAL MARGIN FACTORS TO ACCOUNT FOR A BOW OF THE VVER-1000 FUEL ASSEMBLIES
18th Symposium of AER on VVER Reactor Physics and Reactor Safety (2008, Eger, Hungary)
Core Surveillance and Monitoring
Abstract
Starting from 1980s, the problem of bow of the VVER-1000 reactor FAs and the effect of that on the operational safety is being discussed. At the initial period of time, the extension of time for dropping control rods of the control and protection system associated with this bow posed the highest threat. Later on, new more rigid structures were developed for FAs that eliminated the problems of control rods.