Naslov
Analysis of Different Containment Models for IRIS Small Break LOCA, using GOTHIC and RELAP5 Codes

Autori
Papini, Davide ; Cammi, Antonio ; Ricotti, Marco ; Grgić, Davor

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Conference Nuclear Energy for New Europe 2009 / Cizelj, Leon ; Končar, Boštjan ; Leskovar, Matjaž - Ljubljana : Nuclear Society of Slovenia, 2009, 714.1-714.10

ISBN
978-961-6207-30-0

Skup
International Conference Nuclear Energy for New Europe 2009

Mjesto i datum
Bled, Slovenija, 14.09.2009. - 17.09.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
IRIS; Small Break LOCA; GOTHIC; RELAP5

Sažetak
Advanced nuclear water reactors rely on containment behaviour in realization of some of their passive safety functions. Steam condensation on containment walls, where non-condensable gas effects are significant, is an important feature of the new passive containment concepts, like the AP600/1000 ones. In this work IRIS reactor was taken as reference, and the relevant condensation phenomena involved within its containment were investigated with different computational tools. In particular, IRIS containment response to a Small Break LOCA (SBLOCA) was calculated with GOTHIC and RELAP5 codes. IRIS containment drywell was modelled with RELAP5 according to a sliced approach, based on the two-pipe-with-junction concept, while it was simulated with GOTHIC testing several modelling options, regarding both heat transfer correlations and volume and thermal structure nodalization. The influence on containment behaviour prediction was investigated in terms of drywell temperature and pressure response, Heat Transfer Coefficient (HTC) and steam volume fraction distribution, and internal recirculating mass flowrate. The objective of the paper is to compare the capability of the two codes in modelling of the same postulated accident, thus to check the results obtained with RELAP5, when applied in a situation not covered by its validation matrix. The option to include or not droplets in fluid mass flow discharged to the containment was the most influencing parameter for GOTHIC simulations. Despite some drawbacks, due e.g. to a marked overestimation of internal natural recirculation, RELAP5 confirmed its capability to satisfactorily model the IRIS containment.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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