SAFETY ASSESSMENT CALCULATION PROCEDURE FOR OPERATING VVER UNIT IN MANEUVERING REGIMES EXPERIMENT
29th Symposium of AER on VVER Reactor Physics and Reactor Safety (2019, Energoland, Mochovce NPP, Slovakia)
core surveillance and monitoring
Work presents test safety assessment calculation technique for specified operating high power VVER unit in daily maneuvering regimes. Maneuvering operation test is actual problem of VVER reactors exploitation. Such tests are classified as nuclear hazardous procedures which are accompanied by power variations, regulators actions and continuous space power field fluctuations. As a result a lot of possible initial reactor plant conditions are occurred. This fact is taking into account during experiment safety assessment.
Proposed technique bases on conservative approach. Report contains step-by-step method structure, calculation procedures and applied models description for each step. Initial conditions for some RIA accidents are given and justified. Practically significant conclusions are supported by method application results analysis for assigned task. All calculations are implemented by KORSAR/GP programming code with 3D-neutrion kinetic model