Abstract
Numerical analysis of thermal and hydro dynamical processes in fuel channel of RBMK-1500 reactor: 1. Lower part of fuel channel
Highlights
Ignalina nuclear power plant (INPP) contains two RBMK-1500 reactors [1] which are the last modification of the modernized soviet design channel type reactor RBMK1000 [2]
The main design features of the RBMK reactors are as follows: graphite is used as a main moderator; coolant flows inside the vertical technological channels, which are mounted in the graphite holes; fuel assemblies are placed inside the fuel channels
This paper presents the results of the numerical investigation of the thermal and hydro dynamical processes, which take place inside the lower part of the fuel channels during the hydro and thermal interaction between the coolant and fuel bundles
Summary
Ignalina nuclear power plant (INPP) contains two RBMK-1500 reactors [1] which are the last modification of the modernized soviet design channel type reactor RBMK1000 [2]. This paper presents the results of the numerical investigation of the thermal and hydro dynamical processes, which take place inside the lower part of the fuel channels during the hydro and thermal interaction between the coolant and fuel bundles. The fuel assembly of the RBMK reactor has 18 fuel elements placed in two concentric circles around the central rod inside the round fuel channel (Fig. 1). The RELAP, CATHARE, ATHLET and other program codes allow one–dimensional modelling of the coupled behaviour of the reactor’s coolant system and the core for various operational and accidental conditions Those codes apply simplified one-dimensional nodal schemes for the flow of the coolant [6,7,8]. The results can be used for predicting of hydrogen formation process and for the forecast of the decrease of zirconium alloy strength
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