Since 18 of December 2019 conferences.iaea.org uses Nucleus credentials. Visit our help pages for information on how to Register and Sign-in using Nucleus.
Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream: https://event.do/iaea/a/#/events/5048

PRE-DESIGN OF A PASSIVE DECAY HEAT REMOVAL SYSTEM WITH A PHASE CHANGE MATERIAL FOR SMR-SFR

Apr 20, 2022, 11:16 AM
12m
Vienna, Austria

Vienna, Austria

ORAL Track 2. Fast Reactor Safety 2.2 Safety Design and Analysis

Speaker

Mr Alessandro Pantano (CEA)

Description

The Fukushima accident highlighted the need to improve the design of the safety systems in order to cope the consequences of a full blackout accident. In particular, the decay heat removal function must always be ensured in order to guarantee the integrity of the first barrier and the second one confining the radioactivity. The paper shows the main features of the pre-design of an innovative ex-vessel Decay Heat Removal System (DHRS) designed for a SMR-SFR of a core power of 400 MWth. This safety system allows the heat removal in a fully passive way, only by the radiation of the outer surface of the primary vessel. The radiated heat is extracted by the DHRS through the enhanced natural circulation of a liquid metal flowing inside a bundle of tubes outside the vessel. The final heat sink of the DHRS is another important aspect of innovation. The aim is to diversify it, improving the safety function ensured by a standard water-cooled or air-cooled heat sink. For this purpose, the use of a Phase Change Material (PCM) has been chosen inside the heat sink in order to provide a supplementary thermal inertia, which contributes to improve the cooling capacity of the DHRS. Moreover, a PCM contributes to improve the compactness of the final heat sink, allowing its storage inside a dedicated building. This aspect allows this component to be protected by external aggressions, leading to a significant improvement the safety of the Nuclear Power Plant. The actual design of the ex-vessel DHRS has been applied to the new SFR sketch ATRIUM, in order to guarantee a fully passive cooling of the reactor core for a duration of three or more days.

Speaker's email address alessandro.pantano@cea.fr
Affiliation/Organization CEA
Speaker's title Mr
Country/Int. organization France

Primary author

Co-author

Presentation materials

There are no materials yet.

Peer reviewing

Paper