The overall objective of the Direct Conversion Technology task is to develop an experimentally verified technology base for promising direct conversion systems that have potential application for energy conservation in the end-use sectors. This report contains progress of research on the Alkali Metal Thermal-to-Electric Converter (AMTEC) and on the Two-Phase Liquid-Metal MHD Electrical Generator (LMMHD) for the period January 1, 1991 through December 31, 1991. Research on AMTEC and on LMMHD was initiated during October 1987. Reports prepared on previous occasions (Refs. 1--5) contain descriptive and performance discussions of the following direct conversion concepts: thermoelectric, pyroelectric, thermionic, thermophotovoltaic, thermoacoustic, thermomagnetic, thermoelastic (Nitionol heat engine); and also, more complete descriptive discussions of AMTEC and LMMHD systems.

I give a brief review of the cosmological implications for new particle physics, the search for dark matter and the general nature of dark matter.

Based on observations made during the operation of the Integrated DWPF Melter System, aromatic organics entering the DWPF Chemical Processing Cell (CPC) can be expected to distribute throughout the CPC Process Vessel Vent System and Mercury Purification Cell. The potential impacts to the operation of the DWPF are discussed.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

I give a brief review of the cosmological implications for new particle physics, the search for dark matter and the general nature of dark matter.

Based on observations made during the operation of the Integrated DWPF Melter System, aromatic organics entering the DWPF Chemical Processing Cell (CPC) can be expected to distribute throughout the CPC Process Vessel Vent System and Mercury Purification Cell. The potential impacts to the operation of the DWPF are discussed.

The overall objective of the Direct Conversion Technology task is to develop an experimentally verified technology base for promising direct conversion systems that have potential application for energy conservation in the end-use sectors. This report contains progress of research on the Alkali Metal Thermal-to-Electric Converter (AMTEC) and on the Two-Phase Liquid-Metal MHD Electrical Generator (LMMHD) for the period January 1, 1991 through December 31, 1991. Research on AMTEC and on LMMHD was initiated during October 1987. Reports prepared on previous occasions (Refs. 1--5) contain descriptive and performance discussions of the following direct conversion concepts: thermoelectric, pyroelectric, thermionic, thermophotovoltaic, thermoacoustic, thermomagnetic, thermoelastic (Nitionol heat engine); and also, more complete descriptive discussions of AMTEC and LMMHD systems.

It is believed that spall may have an important effect on various DOE systems designed for verification of -nuclear underground test treaties. The acoustic pulse studied by the Ionospheric Monitoring Program is created specifically by the rapid acceleration of the ground surface of the spall region. Simulation studies indicated that spall effects on surface and body waves may need to be included for proper regional discrimination and yield estimation (Taylor and Randall, 1989). Detailed experimental studies of spall have been sparse. Some work with small contained chemical explosions (Stump, 1985) have measured the spall mass and characteristics. There is a need to extend these measurements to full UGT strengths.

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This paper presents an overview of the preclosure seismic hazards and the influence of these hazards on determining the suitability of Yucca Mountain as a national high-level nuclear-waste repository. Geologic data, engineering analyses, and regulatory guidelines must be examined collectively to assess this suitability. An environmental assessment for Yucca Mountain, written in 1986, compiled and evaluated the existing tectonic data and presented arguments to satisfy, in part, the regulatory requirements that must be met if the Yucca Mountain site is to become a national waste repository. Analyses have been performed in the past five years that better quantify the local seismic hazards and the possibility that these hazards could lead to release of radionuclides to the environment. The results from these analyses increase the confidence in the ability of Yucca Mountain and the facilities that may be built there to function satisfactorily in their role as a waste repository. Uncertainties remain, however, primarily in the input parameters and boundary conditions for the models that were used to complete the analyses. These models must be validated and uncertainties reduced before Yucca Mountain can qualify as a viable high-level nuclear waste repository.