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Severe accident core heatup transients in modular high temperature gas-cooled reactors without operating Reactor Cavity Cooling Systems

Description: The ultimate decay heat removal system for the current Modular High Temperature Gas-Cooled reactors is a completely passive natural convection air cooling loop. This paper considers an extremely remote accident scenario, where even this passive system fails, and heat rejection is only via a layer of thermal insulation to the reactor silo structure and the surrounding soil. The results show that even in this case the peak fuel temperatures remain well within safe limits. However, vessel and conc… more
Date: January 1, 1988
Creator: Kroeger, P. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Testing program for determining the mechanical properties of concrete to temperatures of 621/sup 0/C

Description: Concrete temperatures in a Liquid Metal Fast Breeder Reactor (LMFBR) in excess of normal code limits can result from postulated large sodium spills in equipment cells. Elevated temperature concrete property data which may have application for providing a basis for the design and evaluation of such postulated accident conditions is limited. Data thus needed to be developed commensurate with LMFBR plant applications for critical physical and mechanical concrete properties under prototypic thermal… more
Date: January 1, 1980
Creator: Oland, C.B.; Naus, D.J. & Robinson, G.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tritium storage development. Progress report No. 12, April--June 1977. [In metal hydride; polymer impregnated tritiated concrete]

Description: Laboratory work was continued on hydriding of zirconium sponge and rod under varying conditions of temperature (400 to 900/sup 0/C) and pressure (0-1000 torr) to determine optimum conditions for the formation of hydrides with desirable mechanical properties. Titanium sponge and rod were also hydrided for comparison. Zirconium and titanium samples containing tritium were prepared and initial leach data were obtained. Leach rates for zirconium in distilled water ranged from 1.1 x 10/sup -6/ to 4.… more
Date: January 1, 1976
Creator: Colombo, P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Liquid waste handling facilities for a conceptual LWR spent fuel reprocessing complex

Description: The waste evaporator systems and the methods for evaporating the liquid wastes of various radioactivity levels are discussed. After the liquid wastes are evaporated and nitric acid is recovered the high-level liquid waste is incorporated into borosilicate glass and the intermediate-level liquid waste into concrete for final disposal. (LK)
Date: January 1, 1978
Creator: Witt, D.C. & Bradley, R.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cementitious yttria products

Description: An investigation has been made of the physical properties and formation conditions of cements formed in the yttria/salt/water system. Cementitious binders were of the nominal Y/sub 2/(OH)/sub 5/X.H/sub 2/O type (where X represents the Cl/sup -/ or NO/sub 3//sup -/). An ammonium nitrate-produced yttria cement was shown to be sinterable and was demonstrated to form very refractory castable concretes with zirconia or alumina aggregates.
Date: March 1, 1978
Creator: Holcombe, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geophysics: Building E5032 decommissioning, Aberdeen Proving Ground

Description: integration of data from surveys using three geophysical technologies has provided information used to define the locations of buried utilities, tanks, vaults, and debris near building E5032 at the Aberdeen Proving Ground. Ground penetrating radar (GPR) profiles indicate the presence of buried pipes, tanks, reinforcement rods (rebar), and remnants of railroad tracks. A magnetic map constructed from a detailed magnetic survey on the north side of the building outlines buried iron-rich objects th… more
Date: July 1, 1991
Creator: McGinnis, L.D. & Miller, S.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Applications of concrete polymer materials for the rehabilitation of bridge decks

Description: The rapid deterioration of concrete bridge decks as a result of the increased use of deicing salts is one of the most severe problems facing the highway industry today. One possible solution to the problem is the use of concrete polymer materials. The materials of prime interest are polymer-impregnated concrete (PIC) and polymer concrete (PC), both of which have excellent durability and strength properties. Three potential applications: repair of deteriorated bridge decks, polymer impregnation … more
Date: October 1, 1977
Creator: Kukacka, L. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and analysis of PCRV core cavity closure

Description: Design requirements and considerations for a core cavity closure which led to the choice of a concrete closure with a toggle hold-down as the design for the Gas-Cooled Fast Breeder Reactor (GCFR) plant are discussed. A procedure for preliminary stress analysis of the closure by means of a three-dimensional finite element method is described. A limited parametric study using this procedure indicates the adequacy of the present closure design and the significance of radial compression developed a… more
Date: May 1, 1980
Creator: Lee, T.T.; Schwartz, A.A. & Koopman, D.C.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Considerations in recycling contaminated scrap metal and rubble

Description: Management options for the Department of Energy's increasing amounts of contaminated scrap metal and rubble include reuse as is, disposal, and recycling. Recycling, with its promise of resource recovery, virgin materials conservation, and land disposal minimization, emerges as a preferred management technique. Implementing a cost effective recycling program requires resolution of several issues including: establishing release limits for contaminants, controlling use of recycled materials creati… more
Date: January 1, 1992
Creator: Kluk, A.F. (USDOE, Washington, DC (United States)) & Hocking, E.K. (Argonne National Lab., Washington, DC (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polymer concrete patching materials

Description: The increased use of deicing salts is causing rapid deterioration of portland cement concrete bridge decks. Soluble chlorides cause corrosion of the steel reinforcing rods with a corresponding increase in volume of the rods. This expansion causes stresses in the concrete which result in delaminations and surface spalling. The repair of surface spalls with portland cement concrete can only be made if traffic can be avoided for several days. A patching material which would allow traffic to resume… more
Date: September 1, 1977
Creator: Fontana, J.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of Calculated and Experimental Neutron Attenuation and Streaming Data for Fusion Reactor Design

Description: Integral experiments that measure the neutron and gamma-ray energy spectra resulting from the attenuation of approx. 14 MeV T(D,n)/sup 4/He reaction neutrons in laminated slabs of stainless steel type 304, borated polyethylene, and a tungsten alloy (Hevimet) and from neutrons streaming through a 30-cm-diameter iron duct (L/D = 3) imbedded in a concrete shield have been performed at the Oak Ridge National Laboratory. The facility, NE-213 liquid scintillator detector system, and experimental tech… more
Date: January 1, 1980
Creator: Santoro, R. T.; Alsmiller, R. G., Jr.; Barnes, J. M. & Chapman, G. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Sensitivity study of neutron transport through standard and rebar concrete

Description: An investigation is under way at ORNL to (1) develop a data base pertinent to the transport of neutrons through thick concrete shields, (2) use the data base in an energy group boundary selection and collapsing scheme, and (3) develop a simple methodology to access the data base to provide rapid solutions to practical shielding problems. This paper describes work carried out to fulfill objective (1), the work consisting of calculations of the transport of fission neutrons through 1- and 2-m-thi… more
Date: January 1, 1982
Creator: Bhuiyan, S. I.; Roussin, R. W. & Lucius, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Large scale sodium test facility. [LMFBR]

Description: The large scale sodium test facility in use at Sandia Laboratories was designed to be used for a wide range of sodium interaction experiments. Of initial concern is the interaction of hot sodium with concrete under conditions similar to accident conditions in any sodium cooled reactor. The tests to be run cover the cases of sodium spills and sprays on bare concrete and on cells with defective steel liners. The initial series of tests in progress at the facility involves rapidly dropping from 20… more
Date: January 1, 1977
Creator: King, D.L.; Smaardyk, J.E.; Sutherland, H.J. & Sallach, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computer modeling of thermal storage walls

Description: The modeling of the three-dimensional heat transfer characteristics of thermal storage walls and the effect of nonuniform irradiation is investigated. Depending on how much of the wall is irradiated, a small error in energy storage is introduced with the one-dimensional, uniform irradiation assumption. The results show that these assumptions, currently used in most passive design codes, are adequate to predict the thermal energy storage characteristics. However, the temperature distribution alo… more
Date: May 1, 1980
Creator: Connolly, J. M.; Bingham, C. E. & Ortega, J. K. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Engineering design problems of TFTR

Description: Design of the TFTR poses special engineering problems as a result of constraints posed by the physics requirements of the fusion experiments. The ratio of plasma major and minor radii and the associated magnetic field strength required to achieve desired plasma conditions, the required confinement time, the two-component plasma concept, the complications of providing shielding from the 14 MeV neutrons and the necessity to control the inventory of tritium fuel, all constitute problems which, oft… more
Date: January 1, 1977
Creator: Lee, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Time-dependent behavior of concrete

Description: This paper is a condensed version of the material presented at the International Workshop on Finite Element Analysis of Reinforced Concrete, Session 4 -- Time Dependent Behavior, held at Columbia University, New York on June 3--6, 1991. Dr. P.A. Pfeiffer presented recent developments in time-dependent behavior of concrete and Professor T. Tanabe presented a review of research in Japan on time-dependent behavior of concrete. The paper discusses the recent research of time-dependent behavior of c… more
Date: January 1, 1992
Creator: Pfeiffer, P.A. (Argonne National Lab., IL (United States)) & Tanabe, Tada-aki (Nagoya Univ. (Japan). Dept. of Civil Engineering)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-level nuclear waste immobilization program

Description: Existing high-level nuclear wastes in the United States are described along with current management techniques and long-term disposal options. All of the disposal options involve some type of immobilization operation to restrict radio-nuclide dispersion; the primary option is disposal of immobilized waste packages in deep (500-1000 meter) geological formations. Several immobilized waste forms currently under development are discussed, and form selection factors and regulatory criteria are ident… more
Date: January 1, 1980
Creator: Gordon, D E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Baker Construction, Cincinnati, Ohio. Solar energy system performance evaluation, October 1980-May 1981

Description: The Baker Construction site is a single family residence in Ohio with a passive solar heating system, which consists of 302 square feet of 62 degree sloped greenhouse glazing, a 35,500-pound concrete mass wall, 10,400-pound concrete slab floor, 20 phase change storage rods, six 1-kW electric baseboard heaters, and a wood stove. A solar fraction of 55% is reported. Also the solar savings ratio and conventional fuel savings are given. The performance of the greenhouse collector subsystem, the hea… more
Date: January 1, 1981
Creator: Spears, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of high integrity, maximum durability concrete structures for LLW disposal facilities

Description: A number of disposal facilities for Low-Level Radioactive Wastes have been planned for the Savannah River Site. Design has been completed for disposal vaults for several waste classifications and construction is nearly complete or well underway on some facilities. Specific design criteria varies somewhat for each waste classification. All disposal units have been designed as below-grade concrete vaults, although the majority will be above ground for many years before being encapsulated with ear… more
Date: January 1, 1992
Creator: Taylor, W.P. (Main (Charles T.), Inc., Charlotte, NC (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Water release from heated concretes

Description: Water release from three concretes as a function of temperature has been determined experimentally. Limestone concrete releases more water at a moderate temperature than do magnetite or basalt concretes. The amount of water in the concretes is 6.2%, 6.3%, and 5% by weight for limestone, basalt and magnitite concretes, respectively. All of the concretes show three distinct weight losses as a function of temperature. By 450K, 52 to 75 percent of the water is lost - all of the water is lost by 750… more
Date: March 1, 1982
Creator: Kent, L.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Passive solar construction handbook

Description: Many of the basic elements of passive solar design are reviewed. The unique design constraints presented in passive homes are introduced and many of the salient issues influencing design decisions are described briefly. Passive solar construction is described for each passive system type: direct gain, thermal storage wall, attached sunspace, thermal storage roof, and convective loop. For each system type, important design and construction issues are discussed and case studies illustrating desig… more
Date: August 1, 1981
Creator: Levy, E.; Evans, D. & Gardstein, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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