Saudi International Conference On Nuclear Power Engineering (SCOPE)

Pebble Bed Reactors (PBR) are a Generation-IV reactor design which are a subject of extensive research – due to their increased mixing and turbulence characteristics. Packed beds have sophisticated yet randomized geometry with vacant spaces, increasing the flow complexity in PBR cores. This experimental research on a facility of randomly packed pebble bed spheres investigates the complex flow...

Plenum-to-plenum thermal hydraulics in a Prismatic Modular Reactor (PMR) during loss of flow accidents (LOFA) has been of high interest for several researchers. Accordingly, this study aims to study the effect of uniform and non-uniform heating configurations on the buoyancy driven air in a vertical dual channel plenum-to-plenum facility (P2PF) representing the PMR core geometry. Advanced...

The purpose of this investigation was to study bubble dynamics in an adiabatic air-water two-phase flow, mimicking the Loss of Coolant Accident (LOCA) scenario in a Pressurized Water Small Modular Reactor (PWSMR). A 5x5 rod bundle, with each rod 9.5 mm in diameter and a pitch-to-Diameter ratio (P/D) of 1.33, was used to represent the fuel rods. A 4-point fiber optical probe was used to obtain...

Flow reconstruction of single-phase buoyant jet from sparse temperature measurements

Xicheng Wang, YiMeng Chan, Dmitry Grishchenko, Pavel Kudinov
Division of Nuclear Engineering, Royal Institute of Technology, KTH
Corresponding Address
xicheng@kth.se, ymchan@kth.se, dmitrygr@kth.se, pkudinov@kth.se
ABSTRACT
Measurement of the velocity field in thermal-hydraulic experiments is of great...

Large gas bubbles separated by the liquid slugs are the main characteristic of the slug flow regime. We have analyzed the stagnant Taylor bubble in the vertical isothermal counter-current flow with high speed videos at 100 to 800 frames per second. A single Taylor bubble was captured in each experiment through dynamical balance of the bubble drag in the downward liquid flow. Bubbles of around...

Multiphase flow systems, usually a flow system involving multiple phases, are and have been for decades a phenomenon of particular interest to researchers and scientists globally. This is due to the extensive application of such systems in the physical, chemical, biomedical and petrochemical industries. In the nuclear power industry, accurate prediction of transient phenomenon occurring in the...

Condensation passive containment cooling systems in combination with small modular reactors are pivotal for removing excessive heat from reactors during steam release accident scenarios. However, the presence of non-condensable gases (NCG) significantly reduces the heat transfer, causing safety concerns. This is mainly caused by the accumulation of NCG during condensation. A better...

Steam generator tube rupture (SGTR) is one of the safety issues for pool type lead-cooled fast reactors (LFR). After high-pressure water is injected into the lead pool, the subsequently generated steam bubble would transport to the core and affect the heat transfer performance. This paper addresses tracking the bubble motion using an Eulerian-Lagrangian method in CFD based on the 1/8...

The research findings presented in the literature confirmed that the rotated triangle array is inherently fluidelastically unstable in two-phase flow, especially in the transverse direction. On the other hand, recent work confirmed that the rotated square array is fluidelastically stable for all tested void fractions in two-phase flow, except for 97%. The quasi-steady analysis showed a...