PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY
Series: Nuclear and Reactor Constants

since 1971

Русский (РФ)

ISSN 2414-1038 (online)

BROND-3.1

ISSUES

2018, Issue 2

NUMERICAL SIMULATION OF LARGE REACTIVITY MEASUREMENTS

Authors & Affiliations

Kulikov V.I.1, Popykin A.I.2, Zhylmaganbetov N.M.2
1 St. Petersburg branch of Joint-stock company Federal centre for science and high technology "Special scientific and production Association "Eleron"-"VNIPIET", Saint Petersbugr, Russia
2 Scientific and Engineering Centre for Nuclear and Radiation Safety, Moscow, Russia

Kulikov V.I. – Head of a Laboratory, Cand. Sci. (Phys. and Math), St. Petersburg branch of Joint-stock company Federal centre for science and high technology "Special scientific and production Association "Eleron"-"VNIPIET".
Popykin A.I. – Head of a Laboratory, Cand. Sci. (Phys.- Math), Scientific and Engineering Centre for Nuclear and Radiation Safety.
Zhylmaganbetov N.M. – Research, Scientific and Engineering Centre for Nuclear and Radiation Safety. Contacts: bld. 5, 2/8, Malaya Krasnoselskaya st., Moscow, Russia, 107140. Tel.: +7(499)753-05-24; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Abstract

There is considered a problem about numerical simulation of measurement of total rod worth by using rod drop method in VVER reactor. Total rod worth is large reactivity so it is much larger than the value of the effective delayed neutron fraction – βef. Rod drop method is described in Kazansky Yu.A., Matusevich E.S. "Experimental Reactor Physics", definitions of measured and calculated reactivities for VVER reactors are presented in RB-074-12. The main assumption is quasi-steady formulation of the problem namely it is considered that the system under consideration changes with the time as a result of the change of concentrations of the delayed neutron precursors and the position of control rods. Reactivity of VVER reactors is measured with the aid of ionization chambers located outside the core. The signal of ionization chambers is processed by reactivity meter using inverse kinetics equations. Measurements are conducted at the minimum controlled power level and ionization chambers current is measured. Drop of control rods is conducted at or about critical state of a reactor. With some additional assumptions, some useful conclusions are followed from the analysis for estimating the components of ρk, error, the correlation between errors of measurements and calculations.

Keywords
 VVER, reactivity, numerical simulation of measurement, ionization chamber, emergency protection, control rods, simulation, comparison between results of measurements and calculations, adjoint function

Article Text (PDF, in Russian)

References

UDC 621.039.51

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 2, 2:3