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Post-test calibration of the Effective Momentum Source (EMS) model for steam injection through multi-hole spargers.
KTH.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0002-5794-2651
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
2019 (English)In: 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019, American Nuclear Society , 2019, p. 6176-6189Conference paper, Published paper (Refereed)
Abstract [en]

Steam condensation in a large pool is often used in light water reactors to prevent containment overpressure. In boiling water reactors, steam from the primary system can be released into a pressure suppression pool (PSP) in normal operation and during accidents through multi-hole spargers to control the pressure in the reactor vessel. Steam injection into the pool can lead to the development of thermal stratification that affects (i) pressure suppression capacity of the pool, (ii) operation of the safety systems that use PSP as a source of water (e.g. emergency core cooling system and containment spray). Modeling of direct contact condensation of steam presents a challenge for contemporary codes. Therefore, Effective Heat Source (EHS) and Effective Momentum Source (EMS) models have been proposed to enable prediction of thermal stratification and mixing induced by steam condensation in a large pool. EMS defines the time-averaged effect of steam injection into the pool in terms of a momentum source. For multi-hole spargers, the momentum source requires models for (i) momentum induced by multi-holes steam injection, (ii) direction (vertical angle) of the induced momentum, and profile of velocity in (iii) vertical and (iv) azimuthal directions. Previous works on EMS model validation and sensitivity study against PPOOLEX and HYMERES PANDA pool tests suggest the importance of all these factors for accurate prediction of the pool mixing behaviour. All these parameters, except the velocity profile in the azimuthal direction, were measured in PANDA facility and in Separate Effect Facility (SEF) at Lappeenranta Institute of Technology. The goal of this work is to develop a model for the azimuthal profile of radial velocity (APV) of water induced by steam injection through multi-hole spargers in a pressure suppression pool of a Nordic Boiling Water Reactor (BWR). In previous work, it was assumed that the APV is the same as the radial velocity profile in vertical cross section (which was measured in PANDA experiments using PIV) and can be described by axisymmetric jet expansion model. In this paper, APV is defined as a separate model with own closure for the jet diffusion rate. The effect of the steam mass flow rate is taken into account in the APV and respective jet expansion factor according to the experimental observations. Finally, we compare the pool temperature evolution in the experiment and simulations with the EMS model.

Place, publisher, year, edition, pages
American Nuclear Society , 2019. p. 6176-6189
Keywords [en]
Azimuthal profile of velocity, EHS/EMS model, Pressure suppression pool, Sparger, Thermal stratification and mixing, Condensation, Cooling systems, Electron injection, Expansion, Hydraulics, Lakes, Light water reactors, Mixing, Momentum, Nuclear reactor accidents, Plant shutdowns, Steam, Steam condensers, Thermal stratification, Velocity, Accurate prediction, Azimuthal direction, Boiling water reactor (BWR), Direct contact condensation, Emergency Core Cooling System, Sensitivity studies, Temperature evolution, Boiling water reactors
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268501Scopus ID: 2-s2.0-85073716090OAI: oai:DiVA.org:kth-268501DiVA, id: diva2:1421395
Conference
18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019, 18 August 2019 through 23 August 2019
Note

QC 20200402

Available from: 2020-04-02 Created: 2020-04-02 Last updated: 2020-04-02Bibliographically approved

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Gallego-Marcos, IgnacioGrishchenko, DmitryKudinov, Pavel

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