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OECD MCCI project final report, February 28, 2006.
Although extensive research has been conducted over the last several years in the areas of Core-Concrete Interaction (CCI) and debris coolability, two important issues warrant further investigation. The first issue concerns the effectiveness of water in terminating a CCI by flooding the interacting masses from above, thereby quenching the molten core debris and rendering it permanently coolable. This safety issue was investigated in the Melt Attack and Coolability Experiments (MACE) program. The approach was to conduct large scale, integral-type reactor materials experiments with core melt masses ranging up to two metric tons. These experiments provided unique, and for the most part repeatable, indications of heat transfer mechanism(s) that could provide long term debris cooling. However, the results did not demonstrate definitively that a melt would always be completely quenched. This was due to the fact that the crust anchored to the test section sidewalls in every test, which led to melt/crust separation, even at the largest test section lateral span of 1.20 m. This decoupling is not expected for a typical reactor cavity, which has a span of 5-6 m. Even though the crust may mechanically bond to the reactor cavity walls, the weight of the coolant and the crust …
Date:
May 23, 2011
Creator:
Farmer, M. T.; Lomperski, S.; Kilsdonk, D. J.; Aeschlimann, R. W. & Basu, S.
Object Type:
Report
System:
The UNT Digital Library
OECD MCCI project Melt Eruption Test (MET) design report, Rev. 2. April 15, 2003.
The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core-concrete interaction when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. The Melt Coolability and Concrete Interaction (MCCI) program is pursuing separate effect tests to examine the viability of the melt coolability mechanisms identified as part of the MACE program. These mechanisms include bulk cooling, water ingression, volcanic eruptions, and crust breach. At the second PRG meeting held at ANL on 22-23 October 2002, a preliminary design1 for a separate effects test to investigate the melt eruption cooling mechanism was presented for PRG review. At this meeting, NUPEC made several recommendations on the experiment approach aimed at optimizing the chances of achieving a floating crust boundary condition in this test. The principal recommendation was to incorporate a mortar sidewall liner into the test design, since data from the COTELS experiment program indicates that corium does not …
Date:
May 23, 2011
Creator:
Farmer, M. T.; Lomperski, S.; Kilsdonk, D. J.; Aeschlimann, R. W. & Basu, S.
Object Type:
Report
System:
The UNT Digital Library
OECD MCCI Small-Scale Water Ingression and Crust Strength Tests (Sswics) Design Report, Rev. 2 October 31, 2002.
The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core/concrete interaction (MCCI) when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. However, due to the integral nature of these tests, several questions regarding the crust freezing behavior could not be adequately resolved. These questions include: (1) To what extent does water ingression into the crust increase the melt quench rate above the conduction-limited rate and how is this affected by melt composition and system pressure and (2) What is the fracture strength of the corium crust when subjected to a thermal-mechanical load and how does it depend upon the melt composition? A series of separate-effects experiments are planned to address these issues. The first employs an apparatus designed to measure the quench rate of a pool of corium ({approx}{phi}30 cm; up to 20 cm deep). The main parameter to be varied in these quench tests …
Date:
May 23, 2011
Creator:
Farmer, M.; Lomperski, S.; Kilsdonk, D.; Aeschlimann, B. & Pfeiffer, P.
Object Type:
Report
System:
The UNT Digital Library
A survey on wind power ramp forecasting.
The increasing use of wind power as a source of electricity poses new challenges with regard to both power production and load balance in the electricity grid. This new source of energy is volatile and highly variable. The only way to integrate such power into the grid is to develop reliable and accurate wind power forecasting systems. Electricity generated from wind power can be highly variable at several different timescales: sub-hourly, hourly, daily, and seasonally. Wind energy, like other electricity sources, must be scheduled. Although wind power forecasting methods are used, the ability to predict wind plant output remains relatively low for short-term operation. Because instantaneous electrical generation and consumption must remain in balance to maintain grid stability, wind power's variability can present substantial challenges when large amounts of wind power are incorporated into a grid system. A critical issue is ramp events, which are sudden and large changes (increases or decreases) in wind power. This report presents an overview of current ramp definitions and state-of-the-art approaches in ramp event forecasting.
Date:
February 23, 2011
Creator:
Ferreira, C.; Gama, J.; Matias, L.; Botterud, A.; Wang, J. (Decision and Information Sciences) & Porto), (INESC
Object Type:
Report
System:
The UNT Digital Library
The Sachse News (Sachse, Tex.), Vol. 7, No. 22, Ed. 1 Thursday, June 23, 2011
Weekly newspaper from Sachse, Texas that includes local, state and national news along with advertising.
Date:
June 23, 2011
Creator:
Fisher, Donnita Nesbit
Object Type:
Newspaper
System:
The Portal to Texas History
Market and behavioral barriers to energy efficiency: A preliminary evaluation of the case for tariff financing in California
Consumers regularly forgo purchases of high efficiency appliances that appear to be cost effective at a reasonable rate of return. While some argue that this is a true revelation of preferences for appliance features, this 'efficiency gap' can be largely explained by a combination of market and behavioral failures that reduce consumers ability to evaluate the relative value of appliances and skew preferences toward initial cost savings, undervaluing future reductions in operating costs. These failures and barriers include externalities of energy use, imperfect competition between manufacturers, asymmetric information, bounded rationality, split incentives, and transaction costs (Golove 1996). Recognizing the social benefit of energy conservation, several major methods are used by policymakers to ensure that efficient appliances are purchased: minimum efficiency standards, Energy Star labeling, and rebates and tax credits. There is no single market for energy services; there are hundreds of uses, thousands of intermediaries, and millions of users, and likewise, no single appropriate government intervention (Golove 1996). Complementary approaches must be implemented, considering policy and institutional limitations. In this paper, I first lay out the rationale for government intervention by addressing the market and behavioral failures and barriers that arise in the context of residential energy efficiency. I then …
Date:
June 23, 2011
Creator:
Fujita, K. Sydny
Object Type:
Report
System:
The UNT Digital Library
Doctoral Recital: 2011-04-23 - Clayton Garrett, tuba
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 23, 2011
Creator:
Garrett, Clayton
Object Type:
Sound
System:
The UNT Digital Library
Multipacting Analysis for the Half-Wave Spoke Resonator Crab Cavity for LHC
A compact 400-MHz half-wave spoke resonator (HWSR) superconducting crab cavity is being developed for the LHC upgrade. The cavity shape and the LOM/HOM couplers for such a design have been optimized to meet the space and beam dynamics requirements, and satisfactory RF parameters have been obtained. As it is known that multipacting is an issue of concern in a superconducting cavity which may limit the achievable gradient. Thus it is important in the cavity RF design to eliminate the potential MP conditions to save time and cost of cavity development. In this paper, we present the multipacting analysis for the HWSR crab cavity using the Track3P code developed at SLAC, and to discuss means to mitigate potential multipacting barriers. Track3P was used to analyze potential MP in the cavity and the LOM, HOM and FPC couplers. No resonances were found in the LOM couplers and the coaxial beam pipe. Resonant trajectories were identified on various locations in cavity, HOM and FPC couplers. Most of the resonances are not at the peak SEY of Nb. Run-away resonances were identified in broader areas on the cavity end plate and in the HOM coupler. The enhancement counter for run-away resonances does not show …
Date:
June 23, 2011
Creator:
Ge, Lixin & Li, Zenghai
Object Type:
Article
System:
The UNT Digital Library
Federal Deposit Insurance for Banks and Credit Unions
This report begins with an overview of the FDIC, recent status of the DIF, and efforts to reduce the loss exposure and total risk to the fund. Next, an overview of the NCUA, recent status of the NCUSIF, and efforts to reduce the loss exposure and total risk to the fund are presented.
Date:
March 23, 2011
Creator:
Getter, Darryl E.
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 97, No. 29, Ed. 1 Sunday, October 23, 2011
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 23, 2011
Creator:
Gibbs, Angenene
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 97, No. 50, Ed. 1 Wednesday, November 23, 2011
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 23, 2011
Creator:
Gibbs, Angenene
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 97, No. 72, Ed. 1 Friday, December 23, 2011
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 23, 2011
Creator:
Gibbs, Angenene
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Keene Star (Keene, Tex.), Vol. 18, No. 47, Ed. 1 Thursday, June 23, 2011
Weekly newspaper from Keene, Texas that includes local, state, and national news along with advertising.
Date:
June 23, 2011
Creator:
Gnadt, Paul
Object Type:
Newspaper
System:
The Portal to Texas History
Accurate Alignment of Plasma Channels Based on Laser Centroid Oscillations
A technique has been developed to accurately align a laser beam through a plasma channel by minimizing the shift in laser centroid and angle at the channel outptut. If only the shift in centroid or angle is measured, then accurate alignment is provided by minimizing laser centroid motion at the channel exit as the channel properties are scanned. The improvement in alignment accuracy provided by this technique is important for minimizing electron beam pointing errors in laser plasma accelerators.
Date:
March 23, 2011
Creator:
Gonsalves, Anthony; Nakamura, Kei; Lin, Chen; Osterhoff, Jens; Shiraishi, Satomi; Schroeder, Carl et al.
Object Type:
Article
System:
The UNT Digital Library
GLAST Prospects for Swift-Era Afterglows
We calculate the GeV spectra of gamma-ray burst afterglows produced by inverse Compton scattering of these objects sub-MeV emission. We improve on earlier treatments by using refined afterglow parameters and new model developments motivated by recent Swift observations. We present time-dependent GeV spectra for standard, constant-parameter models, as well as for models with energy injection and with time-varying parameters, for a range of burst parameters. We evaluate the limiting redshift to which such afterglows can be detected by the GLAST Large Area Telescope, as well as by AGILE.
Date:
November 23, 2011
Creator:
Gou, L.J.; /Penn State U., Astron. Astrophys.; Meszaros, P. & U., /Penn State
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 277, Ed. 1 Sunday, January 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 299, Ed. 1 Wednesday, February 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 319, Ed. 1 Wednesday, March 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 122, Ed. 1 Thursday, June 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 165, Ed. 1 Tuesday, August 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 187, Ed. 1 Friday, September 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 208, Ed. 1 Sunday, October 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 230, Ed. 1 Wednesday, November 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 252, Ed. 1 Friday, December 23, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 23, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History