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Kwon, Tae-Soon,Lee, S.T.,Euh, D.J.,Chu, I.C.,Youn, Y.J. Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.7
A new advanced safety feature of DVI+ (Direct Vessel Injection Plus) for the APR+ (Advanced Power Reactor Plus), to mitigate the ECC (Emergency Core Cooling) bypass fraction and to prevent switching an ECC outlet to a break flow inlet during a DVI line break, is presented for an advanced DVI system. In the current DVI system, the ECC water injected into the downcomer is easily shifted to the broken cold leg by a high steam cross flow which comes from the intact cold legs during the late reflood phase of a LBLOCA (Large Break Loss Of Coolant Accident)For the new DVI+ system, an ECBD (Emergency Core Barrel Duct) is installed on the outside of a core barrel cylinder. The ECBD has a gap (From the core barrel wall to the ECBD inner wall to the radial direction) of 3/25~7/25 of the downcomer annulus gap. The DVI nozzle and the ECBD are only connected by the ECC water jet, which is called a hydrodynamic water bridge, during the ECC injection period. Otherwise these two components are disconnected from each other without any pipes inside the downcomer. The ECBD is an ECC downward isolation flow sub-channel which protects the ECC water from the high speed steam crossflow in the downcomer annulus during a LOCA event. The injected ECC water flows downward into the lower downcomer through the ECBD without a strong entrainment to a steam cross flow. The outer downcomer annulus of the ECBD is the major steam flow zone coming from the intact cold leg during a LBLOCA. During a DVI line break, the separated DVI nozzle and ECBD have the effect of preventing the level of the cooling water from being lowered in the downcomer due to an inlet-outlet reverse phenomenon at the lowest position of the outlet of the ECBD.
OPTIMAL DESIGN OF ROAD WEATHER INFORMATION SYSTEMS CASE STUDIES IN NORT AMERICA
Tae J. Kwon 대한교통학회 2023 대한교통학회 학술대회지 Vol.88 No.-
In my presentation, I will introduce an innovative geostatistical approach to the planning problem of one of the most critical winter road intelligent transportation system (ITS) infrastructures; namely, Road Weather Information Systems (RWIS). In particular, the RWIS location model presented features comprehensive account of both explicit and implicit benefits of RWIS information, spatial inference of road weather and surface conditions, and large-scale combinatorial optimizations. The proposed method developed is the first in the literature, providing decision makers with a tool to determine and evaluate alternative RWIS location solutions based on the needs of the traveling public and winter road maintenance requirements. A prototype web-based decision support tool will also be demonstrated, showing the application of the proposed method in several jurisdictions in Canada and the US.
Sandilands, Luke J.,Kyung, Wonshik,Kim, So Yeun,Son, J.,Kwon, J.,Kang, T. D.,Yoshida, Y.,Moon, S. J.,Kim, C.,Noh, Tae Won American Physical Society 2017 Physical Review Letters Vol.119 No.26
<P>The prototypical correlated metal Sr2RhO4 was studied using optical and photoemission spectroscopy. At low energies and temperatures, the optical data reveal a complex, multicomponent response that on the surface points to an unconventional metallic state in this material. Via a comparison with photoemission, the anomalous optical response may be attributed to an unexpectedly strong interband transition near 180 meV between spin-orbit coupled bands that are nearly parallel along Gamma X. This spin-orbit coupling effect is shown to occur in a number of related metallic ruthenates and explains the previously puzzling optical properties reported for these materials.</P>