Authors & Affiliations

Artemov V.G., Kuznetsov A.N.
Alexandrov Research Institute of Technoloqy, Sosnovy Bor, Russia

Artemov V.G. – Head of the Laboratory, Cand. Sci. (Tech.), Alexandrov Research Institute of Technoloqy. Contacts: 72, Koporskoe shosse, Sosnovy Bor, Leningrad region, Russia, 188540. Tel.: +7(81369) 6-08-83; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Kuznetsov A.N. – Head of the Group, Senior Researcher, Alexandrov Research Institute of Technoloqy.


The SAPFIR_95&RC_VVER program package uses two calculation methods of pin-to-pin energy distribution– micro and macro flux superposition method and combined "fine-grid" method (FGM), where computation grid spacing in the reactor core scheme is the same as fuel element spacing in the fuel rod assembly. The combined fine grid method consists of several steps. At the preparation step, the binary archives with records of the pin-by-pin distributions of fuel temperature of fuel and coolant density, burn-up distributions are formed. These archives are based on the superposition method and used as input parameters at the step of pin-to-pin energy distribution computation by the combined fine-grid method. One of the verification steps for FGM computational model is the verification of PS SAPFIR_95&RC_VVER program package using the experimental data obtained during the operation of the actual power units. This paper explains the preparation scheme for the computational model of fine-grid calculation of energy distribution and burn-up, which is implemented in the SAPFIR_95&RC_VVER program package. As an example, the results of burn-up simulation of VVER-1000 loading. The simulation results for energy distribution and critical boric acid concentration are compared to the measurement results gained during the power unit operation.

SAPFIR_95&RC_VVER program package, pin-to-pin energy release, pin-to-pin burn-up, “fine-grid”computation

Article Text (PDF, in Russian)


UDC 621.039.5

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 1, 1:4