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GOTHIC code simulation of thermal stratification in POOLEX facility
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2009 (English)Report (Other academic)
Abstract [en]

Pressure suppression pool is an important element of BWR containment. It serves as a heat sink and steam condenser to prevent containment pressure buildup during loss of coolant accident or safety relief valve opening during normal operations of a BWR. Insufficient mixing in the pool, in case of low mass flow rate of steam, can cause development of thermal stratification and reduction of pressure suppression pool capacity. For reliable prediction of mixing and stratification phenomena validation of simulation tools has to be performed. Data produced in POOLEX/PPOOLEX facility at Lappeenranta University of Technology about development of thermal stratification in a large scale model of a pressure suppression pool is used for GOTHIC lumped and distributed parameter validation. Sensitivity of GOTHIC solution to different boundary conditions and grid convergence study for 2D simulations of POOLEX STB-20 experiment are performed in the present study. CFD simulation was carried out with FLUENT code in order to get additional insights into physics of stratification phenomena. In order to support development of experimental procedures for new tests in the PPOOLEX facility lumped parameter pre-test GOTHIC simulations were performed. Simulations show that dry well and wet well pressures can be kept within safety margins during a long transient necessary for development of thermal stratification.

Place, publisher, year, edition, pages
2009. , 43 p.
Keyword [en]
Thermal stratification, numerical simulation, pressure suppression pool
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-62998ISBN: 978-87-7893-263-1OAI: diva2:481479
QC 20120207Available from: 2012-01-21 Created: 2012-01-21 Last updated: 2012-02-07Bibliographically approved

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