Modeling of Thermal Stratification and Mixing in a Pressure Suppression Pool Using GOTHIC
2016 (English)Conference paper (Refereed)
The development of thermal stratification in the pressure suppression pool of a BWR is a safety issue since it can lead to higher containment pressures than in completely mixed conditions. The thermal hydraulic code of GOTHIC offers a very suitable platform to simulate the pool and containment behavior during a long term accident. However, for a computationally efficient code such as GOTHIC, direct contact condensation cannot be resolved accurately enough to obtain a good estimation of the momentum induced by the condensing steam, and thus, to predict the pool behaviour. In this paper, we present how to implement the previously validated Effective Heat Source (EHS) and Effective Momentum Source (EMS) models, developed for pool analysis during a steam injection, in GOTHIC. The implementation was done using control variables and Dynamically Linked Libraries (DLL). A time averaging model to minimize the effect of the numerical oscillations appearing in GOTHIC when steam is injected into the pool is also proposed.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-194228OAI: oai:DiVA.org:kth-194228DiVA: diva2:1038900
NUTHOS-11: The 11th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operation and Safety, At Gyeongju, Korea
QC 201610252016-10-202016-10-202016-10-25Bibliographically approved