Hlajenje segmenta oplodne obloge reaktorja DEMO v transportni komori

Kaufman, Jan (author), Končar, Boštjan (mentor), Draksler, Martin (co-mentor)

Vroč segment oplodne obloge reaktorja DEMO pri menjavi transportiramo v t.i. transportni komori. Segment se segreva zaradi zaostale toplote, ki je posledica aktivacije materialov zaradi obsevanja med fuzijsko jedrsko reakcijo. V transportni komori se okoliški zrak lokalno segreva, kar povzroči nastanek naravne konvekcije med segmentom in hladnimi stenami komore. Kroženje zraka tako zagotavlja pasiven mehanizem hlajenja komponente. S programom ANSYS Fluent 2021.R2 smo izvedli numerično analizo hlajenja enega segmenta oplodne obloge. Uporabljen je bil sklopljen model vezanega prenosa toplote, za popis termičnega sevanja pa je bil uporabljen model sevanja med površinami S2S. Analiza je pokazala, da naravna konvekcija komori v zagotavlja zadostno hlajenje segmenta. Temperatura obloge s časom pada in se stabilizira pri ~60 °C.

• Language: Slovenian
• Keywords: reaktor DEMO, transportna komora, oplodna obloga, zaostala toplota, naravna konvekcija, računska dinamika tekočin
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2023
• PID: 20.500.12556/RUL-150027
• COBISS.SI-ID: 163994627
• Publication date in RUL: 13.09.2023

Secondary language

• Language: English
• Title: Cooling of a DEMO Breeding Blanket in a transfer cask

Abstract

The hot breeding blanket segment of a DEMO reactor is during the maintenance transported in the so-called transport cask. Due to the residual heat resulting from the activation of materials due to irradiation during the nuclear reaction, the segment is heated internally. The surrounding air in the cask gets locally heated, which causes a natural convection to establish between the segment and the cask's walls. The circulation of air provides a passive cooling mechanism for the system. We performed a numerical analysis of the cooling of a single breeding blanket segment using the ANSYS Fluent 2021.R2 solver. A coupled model of conjugate heat transfer was used, and the S2S model was employed to describe the radiation. The analysis showed that natural convection in the cask provides sufficient cooling for removing the residual heat. The temperature of the breeding blanket segment with the initial temperature of 100 °C is expected to stabilise at approximately 60 °C.

• Keywords: reactor DEMO, transfer cask, breeding blanket, residual heat, natural convection, computational fluid dynamics