Process of asymmetric boron dilution at VVER‐1000 of Kudankulam NPP during Fast Boron Injection System test: Experimental Results and Modelling
26th Symposium of AER on VVER Reactor Physics and Reactor Safety (2016, Helsinki, Finland)
Reactor dynamics and safety analysis
Abstract
THE PROCESS OF ASYMMETRIC BORON DILUTION AT VVER-1000 DURING THE QUICK BORON INJECTION SYSYTEM OF KUDANKULAM NPP. EXPERIMENTAL RESULTS AND SIMULATION.S.V. Tsyganov, A.V. Kotsarev, A.V. Baykov NRC “Kurchatov Institue”ABSTRACTDesign of Kudankulam NPP units includes additional and unique for VVER Quick Boron Injection System (QBIS) for beyond design-basis accident management without scram. During the physical start-up stage at hot zero power of both Kudankulam units special tests were performed to assess the efficiency of the system. In the course of test three out of four QBIS tanks had been promptly opened and it lead to asymmetrical injection of boric acid into the core.The simulation of the test process, including ex-core ion chambers currents and reactivity, has been accomplished using ATHLET/BIPR-VVER code. Behaviour of some reactor parameters in the course of test and some results of simulation are discussed in the presentation.26th Symposium of AER on VVER Reactor Physics and Reactor Safety 36 10 – 14 October 2016, Helsinki, Finland