EPJ Web Conf.
Volume 247, 2021PHYSOR2020 – International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future
|Number of page(s)||8|
|Section||Transient Systems and Analysis|
|Published online||22 February 2021|
ANALYSIS OF MODIFIED PASSIVE SAFETY SYSTEM IN FAST RECTORS TRANSIENTS
1 Politecnico di Milano Building B12, 34 La Masa street, Milano, 20156 Italy
2 University of California, Berkeley Etcheverry Hall, 2521 Hearst Ave, Berkeley, CA 94709, USA
Published online: 22 February 2021
The Autonomous Reactivity Control (ARC) system is a passive safety system aiming to provide an additional negative reactivity feedback during reactor transient scenarios. This paper shows how the performance of the ARC system can be enhanced by introducing a hydraulic diode that allows for different engagement and disengagement speeds of system. The benefits of the proposed system is assessed in a reference soidum-cooled fast reactor (SFR) during multiple postulated transient scenarios. The reactor and plant dynamic response are evaluated using SAS4A/SASSYS-1, whereas for the internal ARC system fluid dynamics, the SAM code is adopted. The two codes are externally coupled using a custom driver script which coordinates data exchange and restart calculations at each time step, with Picard iterations used to converge each time step. All the transients analyzed in this work show that the enhanced ARC system is effective in reducing peak temperatures and in reducing the oscillatory behavior encountered in some cases with the standard ARC system.
Key words: Passive safety / ARC system / SAS4A/SASSYS-1 / SAM / Coupled calculation / Sodium-cooled Fast Reactor
© The Authors, published by EDP Sciences, 2021
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