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Unprotected Loss of Heat Sink Analysis for the Design of ELECTRA
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorfysik.ORCID-id: 0000-0002-6082-8913
(Engelska)Ingår i: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100Artikel i tidskrift (Övrigt vetenskapligt) Submitted
Abstract [en]

In this paper, the transient behavior of a small fast reactor cooled by natural convection of lead (ELECTRA) is studied under unprotected loss of heat sink conditions, as a parametric function of the radiative heat loss via its outer vessel surface. The results show that when this heat loss is higher than the decay heat level, the negative reactivity feedback mechanisms of the system lead to re-criticality, bringing it into a new steady state. As a consequence, coolant freezing may be avoided during such accidents. 

Nyckelord [en]
lead cooled fast reactor, natural circulation, unprotected loss of heat sink transient
Nationell ämneskategori
Annan fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-146991OAI: oai:DiVA.org:kth-146991DiVA, id: diva2:727861
Anmärkning

QS 2014

Tillgänglig från: 2014-06-23 Skapad: 2014-06-19 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Neutronics and Transient Analysis of a Small Fast Reactor Cooled with Natural Circulation of Lead: ELECTRA: European Lead Cooled Training Reactor
Öppna denna publikation i ny flik eller fönster >>Neutronics and Transient Analysis of a Small Fast Reactor Cooled with Natural Circulation of Lead: ELECTRA: European Lead Cooled Training Reactor
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this thesis, neutronics and some relevant transient analyses of the European Lead-Cooled Training Reactor (ELECTRA) are analyzed. ELECTRA is a low-power lead-cooled fast reactor intended for training purpose. The design concept aims for the total nominal power of 0.5 MWth to be fully removed by natural circulation of pure lead, eliminating the need for pumps. A very small compact core with (Pu0.4Zr0.6)N fuel, which relies on neutron reflector to achieve criticality, results in unique reflector dominant neutronic characters. Moreover, a very hard neutron spectrum due to the choice of the fuel and the coolant leads to nearly zero Doppler feedback, relatively small effective delayed neutron fraction as well as short prompt neutron reproduction time. Nevertheless, dynamic stability and safety performance during unprotected transient scenarios are shown to be inherently ensured by the other reactivity feedbacks including the negative coolant temperature. Furthermore, the nature of the natural circulation provides favorable conditions during the studied accident cases. 

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. 42
Serie
TRITA-FYS, ISSN 0280-316X ; 2014:29
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-146992 (URN)978-91-7595-191-1 (ISBN)
Disputation
2014-08-18, sal FA31, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20140625

Tillgänglig från: 2014-06-25 Skapad: 2014-06-19 Senast uppdaterad: 2014-06-25Bibliografiskt granskad

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Wallenius, Janne

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