Abstract
Pebble bed reactors use cycling scheme of spherical fuel elements relying on fuel elements cycling system (FECS). The structure and control logic of FECS are very complex. Each control link has strict requirements on time and sequence. This increases the difficulties of description and analysis. In this paper, timed places control Petri nets (TPCPN) is applied for the modeling of FECS. On this basis the simulation of two important processes, namely uploading fuel elements into the core for the first time and emptying the core is finished by simulation software Arena. The results show that as TPCPN is able to describe different kinds of logic relationship and has time properties and control properties, it’s very suitable for the modeling and analysis of FECS.
Highlights
In recent years, the concept of the fourth generation of advanced nuclear energy systems is put forward in the world
Pebble bed reactors use cycling scheme of spherical fuel elements relying on fuel elements cycling system (FECS)
The results show that as timed places control Petri nets (TPCPN) is able to describe different kinds of logic relationship and has time properties and control properties, it’s very suitable for the modeling and analysis of FECS
Summary
The concept of the fourth generation of advanced nuclear energy systems is put forward in the world. In order to describe and analyze the control logic of FECS accurately, timed places control Petri nets (TPCPN) is used for the modeling of FECS. On this basis some simulations are done to analyze the operation process, including uploading fuel elements into the core for the first time and emptying the core. The results show that as TPCPN has the advantages on describing complex control system and contains time properties, it can describe the control logic of FECS very accurately. It facilitates the simulation with software Arena. The reliable operation of FECS relies on a variety of devices and media, including more than 50 sets of delivery devices, more than 100 counters, nearly 200 electronic gauges, more than 1000 meters of pipeline, etc
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