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Relevant bibliographies by topics / GSI system

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Academic literature on the topic 'GSI system'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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Journal articles on the topic "GSI system"

1

Xu, Xiaofan, Dylan Schreiber, Qing Lu, and Qiong Zhang. "A GIS-Based Framework Creating Green Stormwater Infrastructure Inventory Relevant to Surface Transportation Planning." Sustainability 10, no. 12 (2018): 4710. http://dx.doi.org/10.3390/su10124710.

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The stormwater runoff that carries pollutants from the land adjacent to road transportation systems may impair the water environment and threaten the ecosystem and human health. A proper management approach like green stormwater infrastructure (GSI) can help control flooding and the runoff pollutants. One barrier for GSI analysis relevant to system-level surface transportation planning is the lack of the inventory of GSI in many U.S. cities. This study aims to develop a GIS-based framework for creating GSI inventory in a time and labor efficient way, different from the traditional survey-based method. The new proposed framework consists of three steps, including road categorization, GSI mapping, and GSI type identification using the GIS data, high-resolution land-cover image, and Google Earth street view pictures. The new approach was tested in Philadelphia, Pennsylvania and also applied in Tampa, Florida. The results showed that the new GIS-based framework can achieve similar accuracy to the survey-based method while saving time and labor. The GSI inventory created in the study demonstrated the usefulness of the proposed framework for analyzing the status of GSI implementation and identifying gaps for future planning in terms of potential locations and underrepresented GSI types.

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Xiong, Wei, Ming Ren Yan, and Yao Zhuang Li. "Geotechnical Seismic Isolation System - Further Experimental Study." Applied Mechanics and Materials 580-583 (July 2014): 1490–93. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.1490.

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The isolation effectiveness of the Geotechnical Seismic Isolation (GSI) system was further investigated via a series of prescribed shaking-table tests. The dynamic response of GSI system was also evaluated in detail of this work. A parametric study for assessment of the isolation performance of GSI was conducted by varying experimental key parameters, such as rubber percentage of rubber-sand mixtures (RSM), configuration of the foundation, storey number of the superstructure, and different kinds of seismic acceleration inputs. From the parametric survey, it can be concluded that the GSI system can to some extent attenuate the dynamic response of the superstructure under big earthquake shakings.

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Xiong, Wei, Hing Ho Tsang, S. H. Lo, Shou Ping Shang, Hai Dong Wang, and Fang Yuan Zhou. "Geotechnical Seismic Isolation System - Experimental Study." Advanced Materials Research 163-167 (December 2010): 4449–53. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4449.

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In this study, an experimental investigation program on a newly proposed seismic isolation technique, namely “Geotechnical Seismic Isolation (GSI) system”, is conducted with an aim of simulating its dynamic performance during earthquakes. The testing procedure is three-fold: (1) A series of cyclic simple shear tests is conducted on the key constituent material of the proposed GSI system, i.e., rubber-sand mixture (RSM) in order to understand its behavior under cyclic loadings. (2) The GSI system is then subjected to a series of shaking table tests with different levels of input ground shakings. (3) By varying the controlling parameters such as percentage of rubber in RSM, thickness of RSM layer, coupled with the weight of superstructure, a comprehensive parametric study is performed. This experimental survey demonstrates the excellent performance of the GSI system for potential seismic hazard mitigation.

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Kleist, Daryl T., David F. Parrish, John C. Derber, Russ Treadon, Ronald M. Errico, and Runhua Yang. "Improving Incremental Balance in the GSI 3DVAR Analysis System." Monthly Weather Review 137, no. 3 (2009): 1046–60. http://dx.doi.org/10.1175/2008mwr2623.1.

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Abstract The gridpoint statistical interpolation (GSI) analysis system is a unified global/regional three-dimensional variational data assimilation (3DVAR) analysis code that has been under development for several years at the National Centers for Environmental Prediction (NCEP)/Environmental Modeling Center. It has recently been implemented into operations at NCEP in both the global and North American data assimilation systems (GDAS and NDAS, respectively). An important aspect of this development has been improving the balance of the analysis produced by GSI. The improved balance between variables has been achieved through the inclusion of a tangent-linear normal-mode constraint (TLNMC). The TLNMC method has proven to be very robust and effective. The TLNMC as part of the global GSI system has resulted in substantial improvement in data assimilation at NCEP.

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Essel, H. G., J. Hoffmann, N. Kurz, R. S. Mayer, W. Ott, and D. Schall. "The new data acquisition system at GSI." IEEE Transactions on Nuclear Science 43, no. 1 (1996): 132. http://dx.doi.org/10.1109/23.486018.

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Kleist, Daryl T., David F. Parrish, John C. Derber, Russ Treadon, Wan-Shu Wu, and Stephen Lord. "Introduction of the GSI into the NCEP Global Data Assimilation System." Weather and Forecasting 24, no. 6 (2009): 1691–705. http://dx.doi.org/10.1175/2009waf2222201.1.

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Abstract At the National Centers for Environmental Prediction (NCEP), a new three-dimensional variational data assimilation (3DVAR) analysis system was implemented into the operational Global Data Assimilation System (GDAS) on 1 May 2007. The new analysis system, the Gridpoint Statistical Interpolation (GSI), replaced the Spectral Statistical Interpolation (SSI) 3DVAR system, which had been operational since 1991. The GSI was developed at the Environmental Modeling Center at NCEP as part of an effort to create a more unified, robust, and efficient analysis scheme. The key aspect of the GSI is that it formulates the analysis in model grid space, which allows for more flexibility in the application of the background error covariances and makes it straightforward for a single analysis system to be used across a broad range of applications, including both global and regional modeling systems and domains. Due to the constraints of working with an operational system, the final GDAS package included many changes other than just a simple replacing of the SSI with the new GSI. The new GDAS package contained an upgrade to the Global Forecast System model, including a new vertical coordinate, as well as new features in the GSI that were never developed for the SSI. Some of these new features included changes to the observation selection, quality control, minimization algorithm, dynamic balance constraint, and assimilation of new observation types. The evaluation of the new system relative to the SSI-based system was performed for nearly an entire year of analyses and forecasts. The objective and subjective evaluations showed that the new package exhibited superior forecast performance relative to the old SSI-based system. The new system has been shown to improve forecast skill in the tropics and substantially reduce the short-term forecast error in the extratropics. This implementation has laid the groundwork for future scientific advancements in data assimilation at NCEP.

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He, Xiong Feng, Xian Yun Li, Tong Zhou Ji, Hao Peng, and Kun Liu. "Research on D-PMSG Wind Power System with SDBR for LVRT." Applied Mechanics and Materials 448-453 (October 2013): 1767–72. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1767.

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For enhancing low voltage ride though (LVRT) capability, this paper proposes a new protection scheme of series dynamic breaking resistor (SDBR) connected to the grid-side inverter (GSI) of directly driven permanent magnet synchronous generator (D-PMSG) wind power system, which has a lot of advantages such as possessing low cost, simple structure and high reliability. The structure, switching control strategy and matched resistance of SDBR are researched. The proposed scheme was then applied to uplift GSI voltage during a fault, maintain active power delivered to grid, inhibit DC-link overvoltage and GSI overcurrent. The simulation analysis shows that the SDBR can substantially improve the LVRT capacity of D-PMSG wind power system in PSCAD/EMTDC.

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Zhu, Yanqiu, and Ronald Gelaro. "Observation Sensitivity Calculations Using the Adjoint of the Gridpoint Statistical Interpolation (GSI) Analysis System." Monthly Weather Review 136, no. 1 (2008): 335–51. http://dx.doi.org/10.1175/mwr3525.1.

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Abstract The adjoint of a data assimilation system provides an efficient way of estimating sensitivities of analysis or forecast measures with respect to observations. The NASA Global Modeling and Assimilation Office (GMAO) has developed an exact adjoint of the Gridpoint Statistical Interpolation (GSI) analysis scheme developed at the National Centers for Environmental Prediction (NCEP). The development approach is unique in that the adjoint is derived from a line-by-line tangent linear version of the GSI. Availability of the tangent linear scheme provides an explicit means of assessing not only the fidelity of the adjoint, but also the effects of nonlinear processes in the GSI itself. In this paper, the development of the tangent linear and adjoint versions of the GSI are discussed and observation sensitivity results for a near-operational version of the system are shown. Results indicate that the GSI adjoint provides accurate assessments of the sensitivities with respect to observations of wind, temperature, satellite radiances, and, to a lesser extent, moisture. Sensitivities with respect to ozone observations are quite linear for the ozone fields themselves, but highly nonlinear for other variables. The sensitivity information provided by the adjoint is used to estimate the contribution, or impact, of various observing systems on locally defined response functions based on the analyzed increments of temperature and zonal wind. It is shown, for example, that satellite radiances have the largest impact of all observing systems on the temperature increments over the eastern North Pacific, while conventional observations from rawinsondes and aircraft dominate the impact on the zonal wind increments over the continental United States. The observation impact calculations also provide an additional means of validating the observation sensitivities produced by the GSI adjoint.

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Poor, Cara, Troy Membrere, and Jared Miyasato. "Impact of Green Stormwater Infrastructure Age and Type on Water Quality." Sustainability 13, no. 18 (2021): 10484. http://dx.doi.org/10.3390/su131810484.

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Green stormwater infrastructure (GSI) has become increasingly common to mitigate urban stormwater runoff. However, there is limited research on the impact of age and type of GSI. This study evaluated nutrient and metals concentrations in the soil water of five different GSI systems located at the University of Portland in Portland, Oregon. The GSI systems included a bioretention curb extension (part of Portland’s Green Street project), a bioretention basin, a bioretention planter, an infiltration basin, and a bioswale ranging in age from 2 to 11 years. Samples were taken from each system during rain events over a 10-month period and analyzed for copper (Cu), zinc (Zn), phosphate (PO43−), and total phosphorus (TP). Copper and zinc concentrations were found to be impacted by GSI age, with lower concentrations in older systems. The same trend was not found with PO43− and TP, where almost all GSI systems had soil water concentrations much higher than average stormwater concentrations. Age likely played a role in phosphorus soil water concentrations, but other factors such as sources had a stronger influence. Phosphorus is likely coming from the compost in the soil mix in addition to other sources in runoff. This study shows that GSI systems can be effective for copper and zinc, but changes to the soil mix design are needed to reduce high levels of PO43− and TP in soil water.

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Zhang, Shixuan, and Zhaoxia Pu. "Evaluation of the Four-Dimensional Ensemble-Variational Hybrid Data Assimilation with Self-Consistent Regional Background Error Covariance for Improved Hurricane Intensity Forecasts." Atmosphere 11, no. 9 (2020): 1007. http://dx.doi.org/10.3390/atmos11091007.

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The feasibility of a hurricane initialization framework based on the Gridpoint Statistical Interpolation (GSI)-based four-dimensional ensemble-variational (GSI-4DEnVar) hybrid data assimilation system for the Hurricane Weather Research and Forecasting model (HWRF) model is evaluated in this study. The system considers the temporal evolution of error covariances via the use of four-dimensional ensemble perturbations that are provided by high-resolution, self-consistent HWRF ensemble forecasts. It is different from the configuration of the GSI-based three-dimensional ensemble-variational (GSI-3DEnVar) hybrid data assimilation system, similar to that used in the operational HWRF, which employs background error covariances provided by coarser-resolution global ensembles from the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) ensemble Kalman filtering data assimilation system. In addition, our proposed initialization framework discards the empirical intensity correction in the vortex initialization package that is employed by the GSI-3DEnVar initialization framework in operational HWRF. Data assimilation and numerical simulation experiments for Hurricanes Joaquin (2015), Patricia (2015), and Matthew (2016) are conducted during their intensity changes. The impacts of two initialization frameworks on the HWRF analyses and forecasts are compared. It is found that GSI-4DEnVar leads to a reduction in track, minimum sea level pressure (MSLP), and maximum surface wind (MSW) forecast errors in all of the HWRF simulations, compared with the GSI-3DEnVar initialization framework. With assimilating high-resolution observations within the hurricane inner-core region, GSI-4DEnVar can produce the initial hurricane intensity reasonably well without the empirical vortex intensity correction. Further diagnoses with Hurricane Joaquin indicate that GSI-4DEnVar can significantly alleviate the imbalances in the initial conditions and enhance the performance of the data assimilation and subsequent hurricane intensity and precipitation forecasts.

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Dissertations / Theses on the topic "GSI system"

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Joshi, Ajay Jayant. "Wave-Pipelined Multiplexed (WPM) Routing for Gigascale Integration (GSI)." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10549.

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The main objective of this research is to develop a pervasive wire sharing technique that can be easily applied across the entire range of on-chip interconnects in a very large scale integration (VLSI) system. A wave-pipelined multiplexed (WPM) routing technique that can be applied both intra-macrocell and inter-macrocell interconnects is proposed in this thesis. It is shown that an extensive application of the WPM routing technique can provide significant advantages in terms of area, power and performance. In order to study the WPM routing technique, a hierarchical approach is adopted. A circuit-level, system-level and physical-level analysis is completed to explore the limits and opportunities to apply WPM routing to current VLSI and future gigascale integration (GSI) systems. Design, verification and optimization of the WPM circuit and measurement of its tolerance to external noise constitute the circuit-level analysis. The physical-level study involves designing wire sharing-aware placement algorithms to maximize the advantages of WPM routing. A system-level simulator that designs the entire multilevel interconnect network is developed to perform the system-level analysis. The effect of WPM routing on a full-custom interconnect network and a semi-custom interconnect network is studied.

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Cosar, Songul. "Application Of Rock Mass Classification Systems For Future Support Design Of The Dim Tunnel Near Alanya." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605470/index.pdf.

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In this thesis, the results of a number of rock mass classification systems applied to Dim-higway tunnel study area are presented. The tunnel ground was classified according to Rock Mas Rating (RMR), Modified Rock mass Rating (M-RMR), Rock mass quality (Q), Geological Strength Index (GSI) and New Austrian Tunneling Method (NATM). Dim Tunnel has a horse-shoe shape, with a diameter of 10 meters and maximum overburden thickness of 70 meters. During studies, the geological and geotechnical characteristics of the rock mass along the Dim Tunnel route were investigated. The main objective of rock mass classifications carried out in this study was to obtain adequate data that could be used in future excavation and support-design studies. In order to accomplish this task, literature survey was carried out, followed by a comprehensive field study and laboratorytesting. Field studies involved detailed discontinuity surveys of the exposed rock mass at the surface and on the cores taken within 10-20 meters of the borehole above the tunnel. A geological map and a geological cross-section along the tunnel axis were also prepared. Finally, correlations between the results of the rock mass classification systems were made carrying out statistical analyses for the Dim Tunnel study area. The results obtained from the RMR and M-RMR classifications indicate that M-RMR system estimates better rock mass quality ratings at the upper bounds of the rock mass condition, but worst ratings at the lower bounds (RMR is less than 40) as also suggested by the previous studies.

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Diwisch, Marcel [Verfasser]. "Present and future isochronous mass spectrometry at GSI-FAIR : 25 new masses of fission fragments ; novel analysis method ; design of a new Time-of-Flight detector system / Marcel Diwisch." Gießen : Universitätsbibliothek, 2015. http://d-nb.info/1076241344/34.

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Hájek, Josef. "Správa UPS zdrojů s využitím technologie GSM." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2009. http://www.nusl.cz/ntk/nusl-236645.

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Theme of the Master's thesis is issue of backup power units and its attributes. There is also complete proposal of UPS power unit which can be used to control and monitor backup batteries. Power supply is fully controlled via Ethernet interface using TCI/IP protocol. The other chapter describes complete development of TCI/IP GSM unit which can be used for communication interface between GSM and Ethernet protocol. UPS and GSM modules are developed in details. The Master.s thesis includes all needed information for HW unit development and also for controlling software as well. Universal solution of the modules allows number possibilities of further development.

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Vlado, Veldic. "GIS for spatial decision-making." Diss., University of Pretoria, 2001. http://hdl.handle.net/2263/29747.

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Kan, Ka Ho. "Location estimation system based on the GSM network." HKBU Institutional Repository, 2004. http://repository.hkbu.edu.hk/etd_ra/524.

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Gelieň, Marián. "GIS katastrálního území Detva." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390200.

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The diploma thesis deals with the creation of a geographical information system for the city. The theoretical part deals mainly with issues of geographic data, their models with structures and structures. Database systems are geodatabase oriented. The practical part deals with particular projects of GIS creation for the town of Detva using the ArcInfo software. Part of the project is spatial analysis, which aims to find a suitable location for the location of photovoltaic power plants. The resulting project will be used for Detva's needs.

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Darweesh, Turki H. "Capacity and performance analysis of a multi-user, mixed traffic GSM network." Ottawa, 1999.

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Válek, Milan. "Využití GIS při správě fotovoltaických elektráren." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2010. http://www.nusl.cz/ntk/nusl-222590.

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The Thesis topic deals with the design and implementation of the system for photovoltaic power stations property administration. Due to the scope of the property administered, a solution using geographic information systems has been selected. Functionality of the designed system with data defined for the photovoltaic power stations were verified in the pilot operation. The results of the pilot operation proved efficiency and effectivness of the designed system.

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Žďárská, Kristýna. "Cykloturistický GIS Moravských vinařských stezek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-390232.

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This thesis deals with creation of a geographic information system for two wine cycle route near by Mikulov. The main requirements were visualization of line and point symbols and research possibilities of publication data on the internet. Data, information and photos were collected in the field by the device Zeno 20 from the company Leica. This thesis was created in software ArcGIS for Desktop 10.4.1. from the company Esri and includes formation database queries and simple analysis over the measured data. Final GIS is available to everyone and allows to display the course of the route according to various criterions and points of interest for the needs of wine cyclist.

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Books on the topic "GSI system"

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Rao, D. V. GSI-191: Thermal-hydraulic response of PWR reactor coolant system and containments to selected accident sequences. Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 2002.

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Heatly, Ralph O. GIS-GPS sources. Advanstar Communications, Marketing Services, 1995.

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Heatly, Ralph. GIS-GPS sources. Advanstar Marketing Services, 1995.

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Geoff, Blewitt, ed. Intelligent positioning: GIS-GPS unification. John Wiley, 2006.

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Steede-Terry, Karen. Integrating GIS and the Global Positioning System. ESRI Press, 2000.

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Asha, Mehrotra. GSM system engineering. Artech House, 1997.

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Xi tong gong chen gli lun yu shi jian. Guo fang gong ye chu ban she, 2009.

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1961-, Moore J. Patrick, and Poiker Thomas K, eds. Integrated geospatial technologies: A guide to GPS, GIS, and data logging. John Wiley, 2003.

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Focus on GIS component software: Featuring MapObjects. OnWord Press, 1997.

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United States. Forest Service. Information Systems. National GIS plan: Geographic information system. U.S. Dept. of State, Forest Service, Information Systems, 1988.

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Book chapters on the topic "GSI system"

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Vassilis, Marinos. "Applications of the GSI System to the Classification of Soft Rocks." In Soft Rock Mechanics and Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29477-9_19.

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Xu, Jianjun, and Alfred M. Powell. "GSI/WRF Regional Data Assimilation System and Its Application in the Weather Forecasts over Southwest Asia." In Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications (Vol. II). Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35088-7_25.

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Shekhar, Shashi, and Hui Xiong. "MLPQ System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_791.

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Shekhar, Shashi, and Hui Xiong. "Contingency Management System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_202.

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Shekhar, Shashi, and Hui Xiong. "Reference System, Spatial." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_1097.

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Shekhar, Shashi, and Hui Xiong. "Reference System, Temporal." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_1098.

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Shekhar, Shashi, and Hui Xiong. "Cartographic Information System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_117.

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Shekhar, Shashi, and Hui Xiong. "Global Positioning System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_537.

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Shekhar, Shashi, and Hui Xiong. "Incident Management System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_593.

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Shekhar, Shashi, and Hui Xiong. "Indoor Positioning System." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_628.

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Conference papers on the topic "GSI system"

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Roth, M., R. Bock, U. N. Funk, et al. "High-energy laser system for HIF research at GSI." In Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, edited by W. Howard Lowdermilk. SPIE, 1999. http://dx.doi.org/10.1117/12.354205.

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Hofmann, I. "Development of RF-linac and storage ring system for high-current experiments at GSI." In AIP Conference Proceedings Volume 152. AIP, 1986. http://dx.doi.org/10.1063/1.36288.

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Zhang, Yong-Jie, Wen-Gui Cao, and Ming-Hua Zhao. "Application of Fuzzy Sets to Geological Strength Index (GSI) System Used in Rock Slope." In GeoHunan International Conference 2009. American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41046(353)5.

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Sande, Timothy D., Gilbert L. Zigler, Ernie J. Kee, Bruce C. Letellier, C. Rick Grantom, and Zahra Mohaghegh. "The Benefits of Using a Risk-Informed Approach to Resolving GSI-191." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54604.

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The emergency core cooling system (ECCS) and containment spray system (CSS) in a pressurized water reactor (PWR) are designed to safely shutdown the plant following a loss of coolant accident (LOCA). The assurance of long term core cooling in PWRs following a LOCA has a long history dating back to the NRC studies of the mid 1980s associated with Unresolved Safety Issue (USI) A-43. Results of the NRC research on boiling water reactor (BWR) ECCS suction strainer blockage of the early 1990s identified new phenomena and failure modes that were not considered in the resolution of USI A-43. As a result of these concerns, Generic Safety Issue (GSI) 191 was identified in September 1996 related to debris clogging of the ECCS sump suction strainers at PWRs. Although plants have taken steps to prevent strainer clogging (by increasing the screen area, for example), satisfactory closure of this issue has proved elusive due to long term cooling issues and the effect of chemical precipitates on head loss. Previous investigators have identified bounding scenarios using conservative inputs, methods, and acceptance criteria. The acceptance criteria are applied in a “pass/fail” fashion that ignores risk. That is, if the results are acceptable, the issue has been resolved. Otherwise, it is necessary to either redo the analysis with partial relaxation of analytical conservatisms or perform additional plant modifications to ensure that the acceptance criteria are met. This article describes a new approach to close out the GSI-191 issue by evaluating the risk associated with ECCS performance on post-LOCA core cooling as a basis to change the plant license. The approach includes an assessment of LOCA frequencies as a function of break size at locations along the reactor coolant system, as well as a full quantification of the uncertainties associated with LOCA frequencies and the generation, transport, accumulation, and subsequent impact of debris on ECCS performance. The overall frameworks for the deterministic and risk-informed approaches are summarized with emphasis on the risk-informed method. The differences between the deterministic approach taken in the past and the new risk-informed approach are described. Advantages and disadvantages between the two methods are described and contrasted for the GSI-191 issue. The South Texas Project (STP) GSI-191 risk-informed closure efforts are presented.

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Yoshioka, Toshiyuki, Takashi Motani, Atsushi Fujimaru, et al. "The Demonstrated Function of PLR Pump Mechanical Seal Under SBO Conditions." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66919.

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Generic Safety Issue 23 (GSI-23) by the U.S. Nuclear Regulatory Commission (NRC) was identified in 1980 as a result of staff concerns about reactor coolant pump (RCP) seal failure during Station Blackout (SBO), that is, seal degradation leading to a significant loss of reactor coolant in pressurized-water reactor (PWR) plants. Resolutions of GSI-23 have been considered at PWR plants. In 2000, NRC decided to close GSI-23 and issue Regulatory Issue Summary00–002 (RIS 00–002)[1], based on considerations such as; for example, the improvement of RCP seal performance[2], and the reduction of the risk of RCP seal failure in certain plants by the addition of alternate power sources. After the closure of GSI-23, some licensees were planning to make other associated improvements under their individual plant program. In Japan, the RCP seal was showed that leakage rate was low under SBO testing conditions[3] in licensing safety reviews conducted according to new nuclear regulatory standards after the nuclear accident at the Fukushima Daiichi Nuclear Power Plant. On the other hand, a boiling-water reactor (BWR) is not included in GSI-23 because operating experience indicates that seal failures in BWRs result in smaller leak rates than seal failures in PWRs and, BWRs have the reactor coolant injection capability under SBO conditions, such as the reactor core isolation cooling (RCIC) and the high-pressure coolant injection (HPCI) system. In addition, for the particular BWR-2 type plants that do not have emergency makeup systems, the pump mechanical seal was tested under SBO conditions and successfully showed minimal leakage[4]. However, for the BWR-5 type plants which have the reactor coolant injection capability, such as the RCIC and HPCI systems, the pump seal had not been tested. In Japan, after the nuclear accident at the Fukushima Daiichi Nuclear Power Plant, licensing safety reviews of BWRs and PWRs are being conducted according to new nuclear regulatory standards. We took this opportunity to test the leak rate from Primary Loop Recirculation (PLR) pump mechanical seals under SBO condition. The peak of leak rate was approximately 0.6ton/h (2.6gpm) during the 24 hours of SBO testing condition. Despite damage of O-rings in the mechanical seal by heated water which were ovserbed at post-inspection test, a very low leak rate was realized because the leakage path after passing through the damaged parts of the O-rings was limited by the other restricting pathway in the mechanical seal. This seal leakage was very low, compared with the reactor coolant makeup capability of the RCIC system and the reactor coolant release capability from main steam safety relief valve (SRV). Therefore, we reconfirmed that the result of this leak rate does not affect the safety evaluation for the reactor. It is shown in this paper that the leak rate from PLR pump mechanical seals is low under SBO condition by our demonstration test.

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Hoffmann, T., P. Forck, and D. A. Liakin. "New Spill Structure Analysis Tools for the VME Based Data Acquisition System ABLASS at GSI." In BEAM INSTRUMENTATION WORKSHOP 2006: Twelfth Beam Instrumentation Workshop. AIP, 2006. http://dx.doi.org/10.1063/1.2401422.

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Kauschke, M. "FAIR Cryogenics — New Tasks on the Cryogenic System for the New Research Facility at GSI." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2006. http://dx.doi.org/10.1063/1.2202587.

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Kauschke, M. "Cryogenic System for the New International Accelerator Facility for Research with Ions and Antiprotons at GSI." In ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2004. http://dx.doi.org/10.1063/1.1774704.

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Morton, David, Bruce Letellier, Jeremy Tejada, et al. "Sensitivity Analyses of a Simulation Model for Estimating Fiber-Induced Sump Screen and Core Failure Rates." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30917.

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Output from a high-order simulation model with random inputs may be difficult to fully evaluate absent an understanding of sensitivity to the inputs. We describe, and apply, a sensitivity analysis procedure to a large-scale computer simulation model of the processes associated with Nuclear Regulatory Commission (NRC) Generic Safety Issue (GSI) 191. Our GSI-191 simulation model has a number of distinguishing features: (i) The model is large in scale in that it has a high-dimensional vector of inputs; (ii) some model inputs are governed by probability distributions; (iii) a key model output is the probability of system failure — a rare event; (iv) the model’s outputs require estimation by Monte Carlo sampling, including the use of variance reduction techniques; (v) it is computationally expensive to obtain precise estimates of the failure probability; (vi) we seek to propagate key uncertainties on model inputs to obtain distributional characteristics of the model’s outputs; and, (vii) the overall model involves a loose coupling between a physics-based stochastic simulation sub-model and a logic-based Probabilistic Risk Assessment (PRA) sub-model via multiple initiating events. Our proposal is guided by the need to have a practical approach to sensitivity analysis for a computer simulation model with these characteristics. We use common random numbers to reduce variability and smooth output analysis; we assess differences between two model configurations; and, we properly characterize both sampling error and the effect of uncertainties on input parameters. We show selected results of studies for sensitivities to parameters used in the South Texas Project Electric Generating Station (STP) GSI-191 risk-informed resolution project.

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Adams, J. C., L. I. Ezekoye, S. M. Smith, and S. R. Swantner. "An Application of Computational Fluid Dynamics (CFD) Code to the Design of a Multi-Stage Breakdown Orifice in Support of GSI-191 Evaluations." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26208.

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In September 2004, the Nuclear Regulatory Commission (NRC) issued Generic Letter GL2004-02 “Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors” to address Generic Safety Issue 191 (GSI-191) “Assessment of debris accumulation on PWR sump performance.” [1] GL2004-02 requested pressurized water reactor (PWR) licensees to perform a “downstream effects” evaluation of their emergency core cooling (ECCS) and containment spray systems (CSS). GL2004-02 also gave guidance on what analysis had to be completed in order to resolve GSI-191. These evaluations included a wear and plugging assessment of all ECCS and CSS components, including valves. During preliminary “downstream effects” analysis of a plant, it was determined that the positions of ECCS throttle valves could be such that the flow clearances through the valves would be too small to meet the criteria developed for component plugging or wear assessment. This suggested that a modification to the system needs to be made which allows the throttle valves to be more fully opened. In order to allow the throttle valves to be opened more fully, additional hydraulic resistance (i.e. pressure drop at the design flow rate) was added at another location. Several orifice designs were considered to provide the needed resistance. Since the required additional pressure drop was a substantial fraction of the total pressure drop, special design features of the orifice were necessary to preclude system instabilities due to cavitation, degassing and flow swirl. The purpose of this paper is to present a method for assessing the effectiveness of a multi-stage orifice that can be placed in the system to provide the required resistance, thus permitting the throttle valves to be used more efficiently. The paper presents the design aspects of the multi-stage breakdown orifice, CFD modeling used to select the design, and the system condition testing results.

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Reports on the topic "GSI system"

1

Saltus, Christina, Todd Swannack, and S. McKay. Geospatial Suitability Indices Toolbox (GSI Toolbox). Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41881.

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Habitat suitability models are widely adopted in ecosystem management and restoration, where these index models are used to assess environmental impacts and benefits based on the quantity and quality of a given habitat. Many spatially distributed ecological processes require application of suitability models within a geographic information system (GIS). Here, we present a geospatial toolbox for assessing habitat suitability. The Geospatial Suitability Indices (GSI) toolbox was developed in ArcGIS Pro 2.7 using the Python® 3.7 programming language and is available for use on the local desktop in the Windows 10 environment. Two main tools comprise the GSI toolbox. First, the Suitability Index Calculator tool uses thematic or continuous geospatial raster layers to calculate parameter suitability indices based on user-specified habitat relationships. Second, the Overall Suitability Index Calculator combines multiple parameter suitability indices into one overarching index using one or more options, including: arithmetic mean, weighted arithmetic mean, geometric mean, and minimum limiting factor. The resultant output is a raster layer representing habitat suitability values from 0.0 to 1.0, where zero is unsuitable habitat and one is ideal suitability. This report documents the model purpose and development as well as provides a user’s guide for the GSI toolbox.

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Richardson, K. A. geophysical exploration and geographic information system (GIS) applications. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/211813.

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Caldwell, Douglass R., and Linda H. Graff. Directional Regions in Geographic Information Systems (GIS). Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada268536.

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Tweddale, Scott A. Rock River Geographic Information System: ROCK-GIS (User Manual). Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada430945.

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Horton, William D. Ground Vehicle System Integration (GVSI) and Design Optimization Model. Defense Technical Information Center, 1996. http://dx.doi.org/10.21236/ada360935.

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Hodge, C. Qualification of SRS's KAMS NMC and GIS Systems. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/812411.

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Han, Daikwon. Integrating Geographic Information System (GIS) into Breast Cancer Epidemiologic Research. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada442872.

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Schlossberg, Marc. Active Transportation, Neighborhood Planning and Participatory GIS (Geographic Information System). Portland State University Library, 2008. http://dx.doi.org/10.15760/trec.89.

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Dean, Jesse D., Gregg R. Tomberlin, and Andrea Silvestri. GSA Guidance - Alternative Water Treatment Systems for Cooling Towers. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1593097.

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Lott, Casey A., Peter A. Durkee, Wendy A. Gierhart, and Patty P. Kelly. Florida Coastal Engineering and Bird Conservation Geographic Information System (GIS) Manual. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada537470.

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