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Nuclear plant-aging research on reactor protection systems

Description: This report presents the rsults of a review of the Reactor Trip System (RTS) and the Engineered Safety Feature Actuating System (ESFAS) operating experiences reported in Licensee Event Reports (LER)s, the Nuclear Power Experience data base, Nuclear Plant Reliability Data System, and plant maintenance records. Our purpose is to evaluate the potential significance of aging, including cycling, trips, and testing as contributors to degradation of the RTS and ESFAS. Tables are presented that show th… more
Date: January 1, 1988
Creator: Meyer, L.C.
Partner: UNT Libraries Government Documents Department
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Protective coatings and sealants for solar applications

Description: An aging study has been completed which evaluated a number of polymeric materials for potential use as (1) protective coatings for back surfaces of mirrors and (2) solar heliostat edge seals. These investigations were conducted in an artificial weathering chamber that accelerated thermal cycling. The primary mirror failure mode was observed to be silver corrosion resulting from moisture exposure. To increase mirror longevity in current heliostat designs, intimate bonding at all the composite in… more
Date: September 1, 1980
Creator: Wischmann, K. B. & Gonzales, M. H.
Partner: UNT Libraries Government Documents Department
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Study of aluminum corrosion in aluminum solar heat collectors using aqueous glycol solution for heat transfer. Semiannual technical progress report, July 30, 1979-January 31, 1980

Description: The present work is addressed primarily to the study of the effects of glycol aging at elevated temperatures (above 100/sup 0/C). Glycols are known to be susceptible to thermal decomposition producing new product species which may be aggressive to aluminum. In addition, the possible breakdown of corrosion inhibitors due to long term exposure to high temperature are also investigated. Both uninhibited and inhibited ethylene (as well as propylene) glycols have been aged at temperatures up to 190/… more
Date: February 1, 1980
Creator: Wong, D.; Cocks, F.H. & Giner, J.
Partner: UNT Libraries Government Documents Department
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ADVANCED PRESSURE VESSEL MATERIALS.

Description: Data on 5Cr - 3Mo - 12Ni alloy, PH13 - 8Mo and Iconel 718 for pressure vessel application are given. The 5Cr - 3Mo - 12Ni posseses characteristics suited to uniform aging of heavy sections. Tensile and toughness properties are good, and structural stability up to 315 deg C is adequate. Weldability with 12Ni - 3Cr - 3Mo filler material is good but 12Ni - 5Cr - 3Mo filler is more efficient. Aging characteristics of PH13 - 8Mo may not be suited to uniform aging of heavy sections. Excellent tensile… more
Date: October 31, 1969
Creator: Robertshaw, F.C.; Stephan, H.R. & McConnelee, J.E.
Partner: UNT Libraries Government Documents Department
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Severe accident testing of electrical penetration assemblies

Description: This report describes the results of tests conducted on three different designs of full-size electrical penetration assemblies (EPAs) that are used in the containment buildings of nuclear power plants. The objective of the tests was to evaluate the behavior of the EPAs under simulated severe accident conditions using steam at elevated temperature and pressure. Leakage, temperature, and cable insulation resistance were monitored throughout the tests. Nuclear-qualified EPAs were produced from D. … more
Date: November 1, 1989
Creator: Clauss, D.B. (Sandia National Labs., Albuquerque, NM (USA))
Partner: UNT Libraries Government Documents Department
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Fabrication and characterization of ITO/silicon SIS solar cells. Final report, October 1, 1978-April 30, 1980

Description: The objectives of this research were to optimize the performance of ITO/polycrystalline silicon solar cells, identify performance limitations, identify major stability problems which would inhibit terrestrial application of these devices, evaluate the impact of indium supply and price on terrestrial applications, and evaluate the economic viability of ITO sputter deposited solar cells. These goals were successfully achieved during the course of this multipronged effort. Both area scaling with e… more
Date: June 1, 1980
Creator: DuBow, J. B.
Partner: UNT Libraries Government Documents Department
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Composition of eta carbide in Hastelloy N after aging 10,000 hr at 815/sup 0/C

Description: The composition of the eta carbide in Hastelloy N containing 0.7 wt percent Si in the alloy approaches M/sub 12/C, rather than M/sub 6/C as indicated in the alloy literature. The silicon content of the eta phase in this case was about 25 at. percent, much higher than has been observed in less highly alloyed material. The data do not permit a definition of the limiting compositions of the phases.
Date: November 1, 1977
Creator: Leitnaker, J. M.; Potter, G. A.; Bradley, D. J.; Franklin, J. C. & Laing, W. R.
Partner: UNT Libraries Government Documents Department
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Methodology for predicting long-term fuel-cell performance from short-term testing. Final technical report

Description: The objective of this program was to develop a methodology for predicting long-term fuel cell performance from short-term testing, utilizing a perturbation testing technique. The technique applies small changes of predetermined levels in a predetermined sequence to the operating variables such that the decay mechanisms are not altered. This technique was tested on the phosphoric acid fuel cell (PAFC), because this technology is approaching a mature stage. The initial series of perturbation test… more
Date: August 1, 1981
Creator: Patel, D.; Farooque, M.; Maru, H. & Ware, C.
Partner: UNT Libraries Government Documents Department
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Collector sealants and breathing. Final Report, 25 September 1978-31 December 1979

Description: The objectives of this program were: (1) to investigate the pertinent properties of a variety of possible sealants for solar collectors and identify the most promising candidates, and (2) to study the effect of breathing in flat-plate, thermal solar collector units. The study involved two types of sealants, Class PS which includes preformed seals or gaskets and Class SC which includes sealing compounds or caulks. It was the intent of the study to obtain data regarding initial properties of cand… more
Date: February 20, 1980
Creator: Mendelsohn, M A; Luck, R M; Yeoman, F A & Navish, Jr, F W
Partner: UNT Libraries Government Documents Department
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Load relaxation studies of zircaloy-4

Description: The results of the present work have shown (1) the load relaxation data of Zircaloy-4 in the temperature range of 200/sup 0/C to 385/sup 0/C can be represented by the phenomenological model based on Hart's plastic equation of state; (2) the room temperature load relaxation data reflect the effects of deformation twinning; (3) at higher temperatures the load relaxation data suggest the contribution of grain boundary sliding; and (4) the effects of strain aging can be identified based on the load… more
Date: January 1, 1976
Creator: Huang, F. H.; Sabol, G. P.; McDonald, S. G. & Li, C. Y.
Partner: UNT Libraries Government Documents Department
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R and D Opportunities in Gas-Side Fouling. Executive Summary

Description: This report provides an overview of five research reports that were generated for the Fouling and Corrosion Program. In addition, a listing of research and development opportunities in gas-side fouling is provided. R and D opportunities are designated as technology transfer, basic research, or applied research opportunities.
Date: February 1, 1984
Creator: Garrett-Price, B. A.; Moore, N. L. & Fassbender, L. L.
Partner: UNT Libraries Government Documents Department
open access

Superheated-steam test of ethylene propylene rubber cables using a simultaneous aging and accident environment

Description: The superheated-steam test exposed different ethylene propylene rubber (EPR) cables and insulation specimens to simultaneous aging and a 21-day simultaneous accident environment. In addition, some insulation specimens were exposed to five different aging conditions prior to the 21-day simultaneous accident simulation. The purpose of this superheated-steam test (a follow-on to the saturated-steam tests (NUREG/CR-3538)) was to: (1) examine electrical degradation of different configurations of EPR… more
Date: June 1, 1986
Creator: Bennett, P. R.; St. Clair, S. D. & Gilmore, T. W.
Partner: UNT Libraries Government Documents Department
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Fireset Materials Aging Study

Description: A thermally-accelerated aging study of 10 selected organic materials used in a fireset has been conducted. The study included both quantitative and qualitative gas analyses as well as the measurement of physical properties before and after accelerated aging. The test plan involved single material aging, as well as pairs and larger groups to look for synergistic interactions. The material types tested were epoxies, polyurethanes, polysulfides, silicones, phenolics, polyolefins, and diallyl phtha… more
Date: July 1, 1982
Creator: Smith, H. M.; Arnold, C. & Bailey, M. E.
Partner: UNT Libraries Government Documents Department
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Sandia LSI accelerated aging and data acquisition techniques

Description: The purpose of the Microelectronic Evaluation Laboratory at Sandia is to develop a program for evaluating CMOS LSI (complementary metal oxide silicon - large scale integrated) technology devices which are being used for the first time in a weapon system. These evaluations are based on accelerated aging studies and electrical tests to determine the reliability and life of the devices. In accelerated aging, specific, controlled stresses are applied to the device to accelerate time-to-failure. Dat… more
Date: April 1, 1980
Creator: Walker, J.E.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of unencapsulated ceramic monolithic and MOS thin-film capacitors (25 to 300/sup 0/C)

Description: Several commercial monolithic ceramic and thin-film MOS chip capacitors were evaluated for use in high temperature (300/sup 0/C) geothermal instrumentation. Characteristics of the commonly used dielectric materials (NPO, X7R, BX) and temperature dependence of the insulation resistance are briefly discussed. Some ceramic capacitors with NPO dielectric materials had insulation resistances above 10 megohms at 300/sup 0/C and less than 2% change in capacitance from 25/sup 0/C to 300/sup 0/C, while … more
Date: January 1, 1982
Creator: Nance, W.R.
Partner: UNT Libraries Government Documents Department
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Development of copper sulfide/cadmium sulfide thin-film solar cells

Description: The most important accomplishments during this period were to demonstrate and to elucidate further the complex effects that occur during the aging of Cu/sub 2/S/CdS thin-film solar cells in flowing wet oxygen. There are two distinct effects. At constant illumination, the short-circuit current of cells aged at room temperature consistently decreases with time. The second effect, related to diode opposing current, is more involved and may result from several competing mechanisms. Over the short t… more
Date: March 8, 1982
Creator: Szedon, J. R.; Biter, W. J. & Dickey, H. C.
Partner: UNT Libraries Government Documents Department
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Aging study of Li(Si)/FeS/sub 2/ thermally activated batteries. [Results of accelerated aging at 130/sup 0/C]

Description: A technique for accelerating the aging process of thermally activated batteries that use iron disulfide was developed. In this approach, storage at 130/sup 0/C for one week was assumed equivalent to a shelf life of five years. Some of the batteries stored at 130/sup 0/C were discharged to test for functionality changes, and others were disassembled and carefully analyzed for evidence of deleterious reactions. Some functionality anomalies were observed. The only deleterious reaction observed was… more
Date: May 1, 1980
Creator: Searcy, J. Q. & Neiswander, P. A.
Partner: UNT Libraries Government Documents Department
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Research and development in solar mirror quality assurance performance. Annual report, April 1977--September 1977

Description: A survey of the current technological status of solar reflectors has been initiated for the Energy Research and Development Administration (ERDA). The survey is directed toward the areas of quality assurance and performance of solar mirrors. A program overview is presented, and the initial results of some preliminary studies currently underway are given. More detailed results will be presented as these studies mature. Specific topics that are covered in this report include: (1) An extensive lit… more
Date: September 1, 1977
Creator: Coleman, W. J.; Lind, M. A.; Hampton, H. L. & Gordon, N. R.
Partner: UNT Libraries Government Documents Department
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Microstructure and magnetic properties

Description: The relationship between the microstructure and magnetic properties of heat treated Fe-23 wt percent Cr--15 wt percent Co--5 wt percent V has been studied by transmission electron microscopy and Lorentz microscopy. Three different heat treatments were adopted for the present investigations viz., (1) isothermal aging, (2) TMT (thermomagnetic treatment) + step-aging, (3) continuous cooling. It has been found that the magnetic properties of the alloy are very sensitive to the temperature of the th… more
Date: December 1, 1977
Creator: Belli, Y.; Okada, M.; Thomas, G.; Homma, M. & Kaneko, H.
Partner: UNT Libraries Government Documents Department
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Coaxial extrusion conversion concept for polymeric flat plate solar collectors. Final technical report, September 30, 1978-December 31, 1979

Description: This study investigated materials and processes for fundamental improvements in flat-plate solar collector cost and performance. The goal was to develop a process for direct conversion of inexpensive raw materials into a completed solar collector unit, without labor intensive assembly operations. It was thought that materials carefully matched to the process and end-use environment would substantially reduce collector costs, as compared to conventional industry practice. The project studied the… more
Date: January 1, 1980
Creator: Rhodes, R. O.; Chapman, N. J.; Chao, K. C. & Sorenson, K. F.
Partner: UNT Libraries Government Documents Department
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The effect of precipitation conditions and aging upon characteristics of particles precipitated from aqueous solutions

Description: Precipitation of a dissolved species from aqueous solutions is one of the techniques used to grow particles with certain size or composition characteristics. Various factors affecting the particle properties for sparingly soluble substances are briefly discussed here, including homogeneous versus heterogeneous nucleation, the effect of relative supersaturation on the number of nuclei and their relative size, particle growth by way of Ostwald Ripening, the Ostwald Step Rule and nucleation of met… more
Date: October 1, 1989
Creator: Rard, J.A.
Partner: UNT Libraries Government Documents Department
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