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Residual Heat and Corrosion Processes in the ELECTRA-Reactor Concept
KTH, School of Chemical Science and Engineering (CHE).
2012 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

ELECTRA is a Swedish training reactor concept that will use fourth generation nuclear

reactor technology, and is cooled by natural circulation of liquid lead. During a fuel

inspection the reactor vessel has to be emptied on metal coolant and the power must be

shutoff, this can lead to a meltdown. By calculating the produced residual heat in the fuel pins

during the power shutdown and coolant drainage, the cladding temperature could be

calculated. The potential usage of argon, helium or nitrogen gas as an emergency coolant

during loss of lead was investigated. The gas coolant will unavoidably contain small amounts

of water vapour which can have a negative impact on the core. This matter was examined

with a literature study on the effect of water vapour on the cladding surface; FeCrAl, an iron-

base alloy with high aluminium and chromium content. 

The burnup simulation code Serpent was used for calculating the residual heat. The results

indicated that just after five days of shutdown the residual heat decreased to 31 W/pin and

continued to progressively decrease in the coming days. It was evaluated that the residual heat

developed in the core would not exceed 600°C. 

Calculations on the emergency gas coolant showed that nitrogen gas offered the best solution

on terms of thermal decrease and cost-effectiveness. While helium cooling was the

recommended option due to its inertness. 

The literature study done on the oxidizing effect of water vapour on FeCrAl, shows little

impact due to the high oxidation resistance of this alloy as a result of the high aluminium and

chromium percentage. 

Place, publisher, year, edition, pages
2012. , 36 p.
Keyword [en]
Residual heat, FeCrAl Corrosion, ELECTRA, Cladding Temperature
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-146198OAI: diva2:722710
Educational program
Bachelor of Science in Engineering - Chemical Engineering
Available from: 2014-06-09 Created: 2014-06-09 Last updated: 2015-06-25Bibliographically approved

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