Frank Laboratory of Neutron Physics
Joint Laboratory Seminar
Leader: Egor Lychagin
Date and Time: Thursday, 16 January 2025, at 3:00 PM
Venue: FLNP Conference Hall (3rd floor), Frank Laboratory of Neutron Physics
Seminar topic: “Theoretical calculation of the IBR-2M Reactor dynamic parameters”
Speaker: Evgeny Shabalin
Authors: Evgeny Shabalin, Aleksandr Verkhoglyadov, Maxim Podlesnyy, Ahmed Hassan, Jacob Vdovin, Ivan Kushnir, Valentina Verkhoglyadova
Abstract:
As is known, the IBR-2M Reactor exhibits oscillatory instability at a power of 1.5-2 MW. At present, the reactor dynamics forecast for the near future is carried out by extrapolating the observed trend of the MER (power effect of reactivity) change using a black box model. However, without knowing the real physical nature of the feedback, it is impossible to take technical or administrative measures to guarantee safe operation of the reactor for a long time.
At one time, the physicists of SNIIKZ were given the task of making a substantiated calculation of the IBR-2M feedback, using modern programs for thermomechanical and neutronic problems in three-dimensional real geometry. This work has been completed by now. The main results are as:
- Three components of the “power-reactivity” feedback were identified, and their parameters were obtained with satisfactory accuracy;
- Three components of the feedback do not coincide with those previously assumed on the basis of the three-exponential model of dynamics, and two of them have nonexponential character;
- The obtained results are used in the created dynamics of a pulsed reactor.