APPLICATION OF THE VERIFIED COMPUTATIONAL MODEL FOR BN-800 REACTOR FSA TO ANALYSE ITS DROP CONSEQUENCES

Authors & Affiliations

Vilensky O.Yu., Lapshin D.A., Ryabtsov A.V.
Afrikantov Experimental Design Bureau for Mechanical Engineering, Nizhny Novgorod, Russia

Vilensky O.Yu. – Head of Department, Cand. Sci. (Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering.
Lapshin D.A. – Head of Design Group, Cand. Sci.(Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering. Contacts: 15, Burnakovsky proezd, Nizhny Novgorod, Russia, 603074. Tel.: +7(831) 246-97-21, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Ryabtsov A.V. – Deputy Head of Department, Afrikantov Experimental Design Bureau for Mechanical Engineering.

Abstract

The paper presents the core results of strain process analysis and consequence assessment of FSA drop during its handling at BN-800 RP.
The drop scenario is identified. The computational analysis of the drop is performed using dynamic analysis module LS-DYNA of certified program package ANSYS. The LS-DYNA module is intended for computational analysis of highly linear dynamic processes using explicit scheme of dynamic equation integration.
The calculation employs a simplified elastic plastic model of material with linear isotropic hardening (from ending of the elastic strain corresponding with yield strength stresses to failure strain corresponding with ultimate strength stresses) that conservatively assesses plastic strain level.
Mathematical analysis is performed using the verified finite element model of FSA. Comparison of the analysis results with full-scale experiment demonstrated a good convergence.
The obtained results made it possible to identify plastic strains in all FSA components as well as overloads occurred due to mutual collision with rigid foundation.
The assessment of FSA drop consequences made it possible to conclude about integrity of the developed structure and its potential for further operation.
Application of the comprehensive approach implemented to carry out that computational analysis made it possible to moderately conservatively solve the problem relating to safe RP operation accompanied by equipment drop.

Keywords
FSA, dynamic processes, plastic strain, verification, assessment of drop process consequences, safe operation

Article Text (PDF, in Russian)

References

UDC 539.3

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2017, issue 3, 3:16