A preliminary approach to the development of the startup mode design for the Advanced Lead Fast Reactor European Demonstrator (ALFRED) currently under development within the European FP7 LEADER (Lead-cooled European Advanced Demonstration Reactor) Project has been undertaken. The reactor startup is the operational mode in which all the operating systems of the plant are brought from the cold shutdown condition to the full power operating status, close to power-frequency control. In this phase, the working conditions radically change and it is fundamental that the several control actions are properly coordinated. These aspects deserve a particular attention in a new generation reactor, whose management is not fully defined and for which the control strategy has to be finalized. In the developing of the ALFRED reactor control system, it is then necessary to provide an adequate formalization of the sequence of the several control actions to be performed. For this purpose, Petri net approach has been employed in this work, since it represents a useful formalism for the modelling and the analysis of discrete event systems and it allows to identify the events coming from the plant, which enable the switches among the several feedback controllers. In the first part of the paper, the issues characterizing the startup mode are described and some solutions to bring the reactor to full power mode (fulfilling the technological constraints) are provided. Then, the results of the simulations related to the ALFRED output variables and control variables are discussed.
Petri Net approach for a Lead-cooled Fast Reactor startup design
PONCIROLI, ROBERTO;LORENZI, STEFANO;CAMMI, ANTONIO;LUZZI, LELIO
2013-01-01
Abstract
A preliminary approach to the development of the startup mode design for the Advanced Lead Fast Reactor European Demonstrator (ALFRED) currently under development within the European FP7 LEADER (Lead-cooled European Advanced Demonstration Reactor) Project has been undertaken. The reactor startup is the operational mode in which all the operating systems of the plant are brought from the cold shutdown condition to the full power operating status, close to power-frequency control. In this phase, the working conditions radically change and it is fundamental that the several control actions are properly coordinated. These aspects deserve a particular attention in a new generation reactor, whose management is not fully defined and for which the control strategy has to be finalized. In the developing of the ALFRED reactor control system, it is then necessary to provide an adequate formalization of the sequence of the several control actions to be performed. For this purpose, Petri net approach has been employed in this work, since it represents a useful formalism for the modelling and the analysis of discrete event systems and it allows to identify the events coming from the plant, which enable the switches among the several feedback controllers. In the first part of the paper, the issues characterizing the startup mode are described and some solutions to bring the reactor to full power mode (fulfilling the technological constraints) are provided. Then, the results of the simulations related to the ALFRED output variables and control variables are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
