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Possibility of Air Ingress into a BWR Containment during a LOCA in case of Activation of Containment Venting System
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftssäkerhet.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftssäkerhet.ORCID-id: 0000-0003-3132-7252
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftssäkerhet.ORCID-id: 0000-0002-0683-9136
2014 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The pressure relief systems installed in BWRs protect the containment from overpressure in case of a Loss of Coolant Accident (LOCA). This paper analyzes the possibility of air ingress, which can cause hydrogen burn, through the rupture disks of the filtered and non-filtered venting systems. Two scenarios were considered: a LOCA without SBO (Station Blackout) and a LOCA with SBO. The thermal-hydraulic code GOTHIC® was used with 3D models of the drywell and wetwell of a Nordic-type BWR. In the LOCA event, we found no activation of the rupture disks within the considered transient simulation. Moreover, the containment spray ensured a low pressure in the drywell and induced a continuous mixing of the wetwell pool. In the LOCA with SBO event, the development of thermal stratification in the wetwell pool accelerated the pressure increase in the drywell, which led to activation of the rupture disk of the filtered venting system. However, no air ingress through the vent was found during the depressurization of the containment, and hence no risk of hydrogen burn under the given assumptions.

Ort, förlag, år, upplaga, sidor
2014.
Nyckelord [en]
LOCA, BWR, GOTHIC, rupture disk, thermal stratification and mixing
Nationell ämneskategori
Energiteknik
Forskningsämne
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-165351OAI: oai:DiVA.org:kth-165351DiVA, id: diva2:808117
Konferens
10th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS)
Anmärkning

QC 20161024

Tillgänglig från: 2015-04-27 Skapad: 2015-04-27 Senast uppdaterad: 2016-10-24Bibliografiskt granskad

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https://inis.iaea.org/search/search.aspx?orig_q=RN:47037017

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Villanueva, WalterKudinov, Pavel

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Gallego-Marcos, IgnacioVillanueva, WalterKudinov, Pavel
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