TITLE:
Modelling of the Radiological Contamination of the RBMK-1500 Reactor Control and Protection System Channels’ Cooling Circuit
AUTHORS:
Gintautas Poskas, Rimantas Zujus
KEYWORDS:
Ignalina NPP, RBMK-1500 Reactor, Radiological Contamination
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.3 No.3C,
October
22,
2015
ABSTRACT: The article presents results of modelling
and analysis of component contamination of the RBMK- 1500 reactor Control and
Protection System channels’ Cooling Circuit (CPSCC) at Ignalina NPP Unit 1. The
modelling was performed using a computer code LLWAA-DECOM (Tractebel Energy Engineering,
Belgium), taking into consideration CPSCC components characteristics,
parameters of the water flowing in the circuits, system work regimes, etc.
During the modelling, results on activity of CPSCC components’ deposits,
nuclide composition of the deposits and dose rates after the final shutdown of
the reactor, as well as activity decay of the most contaminated CPSCC
components’ deposits were obtained. Analysis showed that there is a significant
difference in contamination levels between CPSCC components. The rundown header
from the channels of the reactor’s fast acting scram system is the most
contaminated component, and contamination of the least contaminated component
is only 0.27% compared to the activity of the most contaminated component.
Corrosion nuclides are the nuclides that mostly contribute to contamination of
the CPSCC deposits.