Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Investigation of the impact of steady-state VVER-1000 core characteristics on the reactor stability with respect to xenon oscillations

9/16/2020 2020 - #03 Physics and technology of nuclear reactors

Al Malkawi R.T. Batayneh O.W.

DOI: https://doi.org/10.26583/npe.2020.3.03

UDC: 621.039.50OI

The article presents a method for obtaining an analytical expression for the criterion of stability of a VVER-1000 (1200) reactor with respect to xenon oscillations of the local power in the core, containing an explicit dependence of the criterion ratio coefficients on the arbitrary axial neutron field distribution in steady states of the core. Based on the data of numerical experiments using a full-scale model of the Kalinin NPP power units, the authors present the results of checking the validity of this expression for the reactor stability criterion with respect to xenon oscillations for different NPPs with VVER-1000 (1200) reactors in the conditions of load-following modes and non-steady-state reactor xenon poisoning, which can lead to xenon oscillations of the local power throughout the reactor core with VVER-1000 (1200). In this case, the task is to ensure the reactor stability in relation to xenon oscillations of the local power in the core. If the stability problem is not solved, the axial oscillations of xenon can become continuous and, accordingly, be accompanied by an unlimited number of cycles of local power oscillations. This will lead to cyclic thermal loads on the fuel element claddings, which can change the thermomechanical properties of the cladding material, since this affects safe operation of the reactor core.


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reactor stability xenon oscillations axial offset VVER-1000 (1200) flexible (load tracing) operating modes