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  Partner: UNT Libraries Government Documents Department
 Decade: 1980-1989
Pourability Enhancement of PETN Explosive Powders

Pourability Enhancement of PETN Explosive Powders

Date: January 1, 1987
Creator: Vannet, M.D. & Ball, G.L.
Description: Manufacture of precision detonators requires the pelletizing of very fine, organic, crystalline explosive powders. Production of pellets in automatic machines within critical dimensional and weight tolerances requires that the powders pour uniformly into die cavities. The pellets must be able to be initiated with low energy and have a predictable energy output. Modifications to needle-like crystalline PETN explosive powders to make them pourable were introduced by the application of about 80 A thick polymeric coatings to the individual crystals, followed by a controlled agglomeration into a spherical prill. Microencapsulation techniques provided the key to achieving the result using less than 0.5 wt. % coating (an order of magnitude less coating than in usual PBX systems). These coatings did not appreciably alter the energy required to initiate and significantly increased the strength of the pellets. A key point demonstrated, which may be translated to other applications, was that powders that exhibit performance based on physical characteristics could have their handling and strength properties tailored with little change in their primary function.
Contributing Partner: UNT Libraries Government Documents Department
LOFT Monthly Progress Report for August 1980

LOFT Monthly Progress Report for August 1980

Date: September 1, 1980
Creator: Kaufman, N. C.
Description: During August, plant modifications for small-break Test L3-5 continued. The intact-loop-break piping installation is well underway and will be completed soon. Installation of the instrument spool piece was completed and advanced testing disclosed problems which have been worked and are 90% resolved. Installation of the new small-break piping path also made it necessary to fabricate and install hangers for support purposes. Work is progressing well on this effort; however, the additional time required to completion will move the L3-5 Test from a mid-to late-September test date. Major management attention has been devoted to the successful fiscal year 1980 closeout. The actual spending rate to date is still in good agreement with the current approved budgets and authorized funding levels.
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LOFT LTSF Thermocouple Thermal Analysis to Detemrine Transient Temperature Response

LOFT LTSF Thermocouple Thermal Analysis to Detemrine Transient Temperature Response

Date: June 23, 1980
Creator: Howell, S. K.
Description: A two-dimensional finite element model of the LOFT LTSF thermocouple assembly was developed to study the thermal response of the thermocouples to the expected temperature transient in the L3-4, 5 and 6 experiments. Subjecting the thermocouple model to a 10 F fluid temperature step change resulted in a .10 second delay before 95% of the step change was observed in the thermocouple temperature response. A thermal analysis was performed on the Loft Test Support Facility (LTSF) small-break thermocouple assembly to evaluate the thermal response of the thermocouples during the upcoming L3-4, 5 and 6 small-break experiments. The thermocouple assembly (see Figure 1) consists of 3 Type K thermocouples placed radially through an 8 inch diameter section on the pressurizer relief line in the LTSF. In support of the upcoming L3-4, 5 and 6 experiments the LTSF will be used to define thermal conditions expected during these tests. The temperature transients these thermocouples are required to follow are very rapid step changes. Therefore, it is necessary that these thermocouples have a short response time in order to follow the temperature transient in this line. A two-dimensional finite element model of the thermocouple assembly was constructed using COUPLE, a finite element heat ...
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Modular Isotopic Thermoelectric Generator

Modular Isotopic Thermoelectric Generator

Date: April 3, 1981
Creator: Schock, Alfred
Description: Advanced RTG concepts utilizing improved thermoelectric materials and converter concepts are under study at Fairchild for DOE. The design described here is based on DOE's newly developed radioisotope heat source, and on an improved silicon-germanium material and a multicouple converter module under development at Syncal. Fairchild's assignment was to combine the above into an attractive power system for use in space, and to assess the specific power and other attributes of that design. The resultant design is highly modular, consisting of standard RTG slices, each producing ~24 watts at the desired output voltage of 28 volt. Thus, the design could be adapted to various space missions over a wide range of power levels, with little or no redesign. Each RTG slice consists of a 250-watt heat source module, eight multicouple thermoelectric modules, and standard sections of insulator, housing, radiator fins, and electrical circuit. The design makes it possible to check each thermoelectric module for electrical performance, thermal contact, leaktightness, and performance stability, after the generator is fully assembled; and to replace any deficient modules without disassembling the generator or perturbing the others. The RTG end sections provide the spring-loaded supports required to hold the free-standing heat source stack together during ...
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Solar Design Workbook

Solar Design Workbook

Date: June 1, 1981
Creator: Franta, G.; Baylin, F.; Crowther, R.; Dubin, F.; Grace, A., Griffith, J.W.; Holtz, M. et al.
Description: This Solar Design Workbook presents solar building design applications for commercial buildir^s. The book is divided into four sections. The first section describes the variety of solar applications in buildings including conservation aspects, solar fundamentals, passive systems, active systems, daylighting, and other solar options. Solar system design evaluation techniques including considerations for building energy requirements, passive systems, active systems, and economics are presented in Section II. The third section attempts to assist the designer in the building design process for energy conservation and solar applications including options and considerations for pre-design, design, and post-design phases. The information required for the solar design proee^ has not been fully developed at this time. Therefore, Section III is incomplete, but an overview of the considerations with some of the design proces elements is presented. Section IV illustrates ease studies that utilize solar applications in the building design.
Contributing Partner: UNT Libraries Government Documents Department
LOFT Monthly Progress Report for April 1980

LOFT Monthly Progress Report for April 1980

Date: May 1, 1980
Creator: Kaufman, N. C.
Description: During April, activities continued in preparation for Tests L6-5 and L3-7, currently scheduled for June 1 and June 23. April activities at the LOFT facility were particularly centered around the installation of new and improved instrumentation. During April, a new baseline budget was established for FY-1980, the third major change this fiscal year. This baseline plan reflects a revised test sequence and dates reflecting test needs (particularly instrumentation), and current funding. Costs to date are in good agreement with the current budgets and the authorized funding levels. During April, a revised budget was proposed for FY-1981 and a new budget was proposed for FY-1982. These budgets and their assumptions were presented to NRC in mid-year reviews and important decision elements were identified. A reorganization of the LOFT personnel was announced this month. The LOFT Experimental Program Division was replaced with the LOFT Program Division, managed by Dr. C. W. Solbrig, and with the LOFT Measurements Division, managed by D. J. Hanson.
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LOFT Monthly Progress Report for November 1980

LOFT Monthly Progress Report for November 1980

Date: December 1, 1980
Creator: Kaufman, N. C.
Description: During November major work efforts were directed towards preparation for Test L3-6/L8-1. These tests, to be run in sequence, will evalute the system effects of primary coolant pump operation during a small break LOCA (L3-6), and are to obtain a partial core uncovery to aid in the planning and conduct of future core uncovery experiments (L8-1). Plant modifications in preparation for the December test included installation of a new PC-3 gamma densitometer to measure the density of fluid coming from the steam generator and the installation of the EPRI Liquid Level Detector system to measure levels of fluid during the core uncovery experiment. Other key efforts concerned planning for test conduct and safety analysis. On November 6 and 7 the LOFT Review Group met in Idaho Falls to evaluate the activities on LOFT since its last meeting in February. Future test plans, budgets, the man-machine (AOC) program, and various other topics presented by LOFT personnel and consultants were discussed. Several suggestions were presented by those in attendance. These comments were directed to the areas of test scheduling and the kinds of tests to be run as well as how LOFT could better communicate with utilities and vendors to transmit information ...
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LOFT Monthly Progress Report for December 1980

LOFT Monthly Progress Report for December 1980

Date: January 1, 1981
Creator: Leach, L. P.
Description: On December 10, 1980, LOFT conducted its fifth nuclear test in the L3 Series (small break) as well as the first in the L8 Series (core uncovery). The tests, designated L3-6/L8-1, were run in series with each experiment designated to address specific safety questions. Test L3-6 simulated a four-inch break in a commercial pressurized water reactor. The purpose of this experiment was to investigate the influence of main coolant pump operation on the quantity of fluid which leaves the system and the quantity of fluid in the reactor core region during the experiment. The results of L3-6 are being compared with the results of a previous LOFT test, designated L3-5, which was performed on September 29, 1980. On December 9 and 10, a special review group committee, commissioned by the NRC, visited LOFT. The purpose of the committee's presence here was to study and evaluate the LOFT project, and then report recommendations to the NRC. The NRC would then use this information to help determine how the resources of the project could best be utilized, and which kind and how many tests should be conducted over how long a time period. Recommendations of this committee are expected to be announced ...
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MITG Test Plan

MITG Test Plan

Date: August 1, 1981
Creator: Eck, Marshall B.
Description: The plan presented is for the testing of a prototypical slice of the Modular Isotopic Thermoelectric Generator (MITG). Cross Reference T48-1.
Contributing Partner: UNT Libraries Government Documents Department
Unique Features and Spacecraft Applications of Dynamic Isotope Power Systems

Unique Features and Spacecraft Applications of Dynamic Isotope Power Systems

Date: January 1, 1982
Creator: Raab, B.
Description: The dynamic isotope power system represents the most recent attempt to develop a heat-engine generator for space electric power. A major objective in this most recent effort was to increase the power and to reduce the cost of nuclear space power systems to the point where the unique features of this power source could be brought to bear for Earth-orbit missions which could benefit therefrom. This objective was largely achieved; both weight and cost of the dynamic isotope systems are comparable to solar power systems. The dynamic isotope power system, designed for spacecraft requiring prime power in the 500-2000 W range, has been successfully built and ground tested. A number of studies, summarized herein, have demonstrated the advantages of using such a power system instead of the conventional solar system for a variety of Earth-orbit missions. These advantages stem from the unique nature of the dynamic isotope system, different in kind from solar power systems. As a result, in many cases, the spacecraft design can be significantly simplified and more closely harmonized with mission requirements. This overall advantage can be crucial in missions which have stringent pointing, stability, viewing, and/or positioning requirements.
Contributing Partner: UNT Libraries Government Documents Department
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