28th Symposium of AER on VVER Reactor Physics and Reactor Safety (2018, Olomouc, Czechia)
Core surveillance and monitoring
A. Е. Kalinushkin, Yu.М. Semchenkov, N.V. Milto (NRC Kurchatov Institute)
For the in-core monitoring system (ICIS), the NPP project establishes operational limits and limits for safe operation, as well as conditions for safe operation.
The limits are set depending on the power and operability of the main process equipment, and the conditions – depending on the performance of sensors and ICIS equipment, herewith the regulations indicate the permissible time of failure and actions of the operative personnel.
When setting the limits, the uncertainty of ICIS calculations is taken into account.
The importance of ICIS for NPP designs with VVER-1200 reactors is also due to the necessity of implementing core protection according to the peaking factors.
ICIS is currently installed at 2 units of AES-2006 (Novovoronezh NPP-2 and Leningrad NPP-2). Tests during the units startup confirmed the design requirements.