ANALYSIS AND DEVELOPMENT OF THE AUTOMATED EMERGENCY ALGORITHM TO CONTROL PRIMARY TO SECONDARY LOCA ACCIDENT FOR SUNPP SAFETY UPGRADING
17th Symposium of AER on VVER Reactor Physics and Reactor Safety (2007, Yalta, Crimea (Ukraine, back then))
REACTOR DYNAMICS, THERMAL HYDRAULICS AND SAFETY ANALYSIS
Abstract
The paper presents the results of the study conducted to support planned modernization of the South Ukraine nuclear power plant. The objective of the analysis has been to develop the automated emergency control algorithm for primary to secondary LOCA accident for SUNPP VVER-1000 safety upgrading.
According to the analyses performed in the framework of SAR, given accident is the most complex for control and has the largest contribution into the CDF value. This is because of IE diagnostics is difficult, emergency control is complicated for personnel, time available for decision making and actions performing is limited with coolant inventory for make-up, probability of SDVs on affected SG non-closing after opening is high, and as a consequence containment bypass, irretrievable loss of coolant and radioactive materials release into the environment are possible.