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Title: Calculations of high pressure melt boundaries.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the JOWOG 32mat-eos held July 12-14, 2016 in Livermore, CA.
Country of Publication:
United States

Citation Formats

Shulenburger, Luke. Calculations of high pressure melt boundaries.. United States: N. p., 2016. Web.
Shulenburger, Luke. Calculations of high pressure melt boundaries.. United States.
Shulenburger, Luke. 2016. "Calculations of high pressure melt boundaries.". United States. doi:.
title = {Calculations of high pressure melt boundaries.},
author = {Shulenburger, Luke},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7

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  • The authors have investigated the textural microstructure of iron-nickel-sulfur melts in contact with olivine, pyroxene, and the modified-spinel polymorph of olivine. The experiments were conducted at 1,500 C and pressures ranging from 1 to 17 GPa. For compositions more metal-rich than the monosulfide, including the eutectic composition, the metal sulfide melt has a dihedral angle greater than 60{degree} and does not form an interconnected grain-edge fluid. Increasing pressure does not measurably alter the dihedral angles. Textural evolution results in coarsening of the sulfide melt pockets, resulting in large pockets surrounded by many silicate grains and separated from one another bymore » melt-free grain edges. Chemical communication between these large pockets is limited to lattice and grain-boundary diffusion. Due to the large interfacial energy between sulfide melt and silicates, sulfide melts are unable to separate from solid silicate via grain-boundary percolation and remain stranded in isolated melt pockets. Sulfide melt in excess of the critical melt fraction (5--25%) will develop a transient interconnectivity as sulfide collects into larger melt pockets and interconnectivity is pinched off. Efficient separation of core-forming sulfide melts from silicate requires either melting of the silicate matrix or a very large fraction of metal-sulfide melt (perhaps as large as 40%).« less
  • Conventional polycrystalline HTS possess extremely low transport critical current density, which has been attributed to grain boundary related deficiencies. We have developed a processing method to eliminate secondary phases and to reduce the amount of microcracks at the grain boundaries in melt-textured YBCO superconductors. In this process, a fraction of the liquid phase is removed during melt-texturing which lead to cleaner grain boundaries. These boundaries have been found to carry high currents (3 {times} 10{sup 4}A/cm{sup 2} at self field and 1.5 {times} 10{sup 2}A/cm{sup 2} at 1.5T) at 77 K in spite of relatively high misorientation angles. Also, themore » weak dependence of J{sub c} on magnetic field indicates that these grain boundaries are strongly coupled. In addition, the linear I-V characteristics of these samples suggest that flux flow along these boundaries may be the J{sub c} limiting mechanism. These results give promise to manufacturing of polycrstalline YBCO superconductor with high current carrying capability.« less
  • This report presents information concerning the behavior of the corium that results from a meltdown of a PWR type reactor. 17 refs. (JDB)
  • The loadings on containment due to direct containment heating (DCH) as a result of high-pressure melt ejection (HPME) in advanced pressurized water reactors meeting the recommendations of the Electric Power Research Institute Advanced Light Water Reactor (ALWR) Requirements Document were assessed by the U.S. Department of Energy (DOE) Advanced Reactor Severe Accident Program. Advanced light water reactors will have at least five features that tend to mitigate the effects of HPME: (1) a large, strong containment; (2) a reactor cavity configuration that limits the amount of debris that can transfer thermal and chemical energy rapidly to gases in the containment;more » (3) a means of reactor cavity flooding; (4) an in-containment refueling water storage tank (IRWST) that assures a large supply of water and also serves as a quench tank; and (5) a depressurization system to reduce reactor coolant system (RCS) pressure prior to reactor vessel melt-through to prevent HPME. The results indicate that the reactor cavity configuration need only inhibit {approximately}40% of the energy entering it from the HPME ((0.75 to 0.45)/0.75, assuming a 75% maximum possible core ejection) from heating and pressurizing the upper containment atmosphere. If the cavity is preflooded with IRWST water, the containment is unchallenged for even 100% core ejection. Since these analyses were based on conservative assumptions, they provide an upper bound on the effect of HPME and DCH on ALWR containment pressure.« less
  • Severe nuclear plant accidents can involve the degradation of the reactor core while the primary coolant system remains pressurized. Molten fuel reaching the lower head of the reactor pressure vessel (RPV) may attack and fail the instrument guide tube penetrations, allowing the tube to be expelled from the vessel. The resulting aperture allows the molten fuel to be ejected into the cavity, followed by the blowdown of the contents of the primary system (high-pressure-melt ejection). Entrainment of the core debris in the cavity by the blowdown gases may cause high-temperature fuel particles to be carried into the containment building. Energymore » exchange between the particles and the atmosphere may cause heating and pressurizing of the containment (direct containment heating (DCH)). The complex phenomena associated with direct containment heating accident sequences are not well understood. This work describes a series of four experiments that have been performed to study and quantify the processes involved. The data from the experiments are used to guide the development of computer models to describe the response of containments under accident conditions.« less