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A sensitivity study of MELCOR nodalization for simulation of in-vessel severe accident progression in a boiling water reactor
KTH.
KTH.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftssäkerhet.ORCID-id: 0000-0003-3132-7252
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftssäkerhet.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 343, s. 22-37Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper presents a sensitivity study of MELCOR nodalization for simulation of postulated severe accidents in a Nordic boiling water reactor, with the objective to address the nodal effect on in-vessel accident progression, including thermal-hydraulic response, core degradation and relocation, hydrogen generation, source term release, melt behavior and heat transfer in the lower head, etc. For this purpose, three meshing schemes (coarse, medium and fine) of the COR package of MELCOR are chosen to analyze two severe accident scenarios: station blackout (SBO) accident and large break loss-of-coolant accident (LOCA) combined with station blackout. The comparative results of the MELCOR simulations show that the meshing schemes mainly affect the core degradation and relocation to the lower head of the reactor pressure vessel: the fine mesh leads to a delayed leveling process of a heap-like debris bed in the lower head, and a later breach of the vessel. The simulations with fine mesh also provide more detailed distributions of corium mass and temperature, as well as heat flux which is an important parameter in qualification assessment of the In-Vessel Melt Retention (IVR) strategy.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE SA , 2019. Vol. 343, s. 22-37
Emneord [en]
Boiling water reactor, Reactor safety, Severe accident, MELCOR simulation, Mesh sensitivity analysis
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-244082DOI: 10.1016/j.nucengdes.2018.12.011ISI: 000456923500003Scopus ID: 2-s2.0-85059233155OAI: oai:DiVA.org:kth-244082DiVA, id: diva2:1289923
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QC 20190219

Tilgjengelig fra: 2019-02-19 Laget: 2019-02-19 Sist oppdatert: 2019-04-29bibliografisk kontrollert

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