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Reliability Issues In Stirling Radioisotope Power Systems
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721686117 Total Pages :30 pages Book Rating :4.6/5 (861 download)
Book Synopsis Reliability Issues in Stirling Radioisotope Power Systems by : National Aeronautics and Space Administration (NASA)
Download or read book Reliability Issues in Stirling Radioisotope Power Systems written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stirling power conversion is a potential candidate for use in a Radioisotope Power System (RPS) for space science missions because it offers a multifold increase in the conversion efficiency of heat to electric power and reduced requirement of radioactive material. Reliability of an RPS that utilizes Stirling power conversion technology is important in order to ascertain long term successful performance. Owing to long life time requirement (14 years), it is difficult to perform long-term tests that encompass all the uncertainties involved in the design variables of components and subsystems comprising the RPS. The requirement for uninterrupted performance reliability and related issues are discussed, and some of the critical areas of concern are identified. An overview of the current on-going efforts to understand component life, design variables at the component and system levels, and related sources and nature of uncertainties are also discussed. Current status of the 110 watt Stirling Radioisotope Generator (SRG110) reliability efforts is described. Additionally, an approach showing the use of past experience on other successfully used power systems to develop a reliability plan for the SRG110 design is outlined. Shah, Ashwin R. and Schreiber, Jeffrey G. Glenn Research Center NASA/TM-2004-213428, AIAA Paper 2004-5506, E-14962
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721775088 Total Pages :32 pages Book Rating :4.7/5 (75 download)
Book Synopsis Reliability Assessment Approach for Stirling Convertors and Generators by : National Aeronautics and Space Administration (NASA)
Download or read book Reliability Assessment Approach for Stirling Convertors and Generators written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stirling power conversion is being considered for use in a Radioisotope Power System for deep-space science missions because it offers a multifold increase in the conversion efficiency of heat to electric power. Quantifying the reliability of a Radioisotope Power System that utilizes Stirling power conversion technology is important in developing and demonstrating the capability for long-term success. A description of the Stirling power convertor is provided, along with a discussion about some of the key components. Ongoing efforts to understand component life, design variables at the component and system levels, related sources, and the nature of uncertainties is discussed. The requirement for reliability also is discussed, and some of the critical areas of concern are identified. A section on the objectives of the performance model development and a computation of reliability is included to highlight the goals of this effort. Also, a viable physics-based reliability plan to model the design-level variable uncertainties at the component and system levels is outlined, and potential benefits are elucidated. The plan involves the interaction of different disciplines, maintaining the physical and probabilistic correlations at all the levels, and a verification process based on rational short-term tests. In addition, both top-down and bottom-up coherency were maintained to follow the physics-based design process and mission requirements. The outlined reliability assessment approach provides guidelines to improve the design and identifies governing variables to achieve high reliability in the Stirling Radioisotope Generator design. Shah, Ashwin R. and Schreiber, Jeffrey G. and Zampino, Edward and Best, Timothy Glenn Research Center NASA/TM-2004-213078, E-14554
Book Synopsis Reliability Assessment Approach for Stirling Convertors and Generators by : Ashwin R. Shah
Download or read book Reliability Assessment Approach for Stirling Convertors and Generators written by Ashwin R. Shah and published by BiblioGov. This book was released on 2013-07 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stirling power conversion is being considered for use in a Radioisotope Power System for deep-space science missions because it offers a multifold increase in the conversion efficiency of heat to electric power. Quantifying the reliability of a Radioisotope Power System that utilizes Stirling power conversion technology is important in developing and demonstrating the capability for long-term success. A description of the Stirling power convertor is provided, along with a discussion about some of the key components. Ongoing efforts to understand component life, design variables at the component and system levels, related sources, and the nature of uncertainties is discussed. The requirement for reliability also is discussed, and some of the critical areas of concern are identified. A section on the objectives of the performance model development and a computation of reliability is included to highlight the goals of this effort. Also, a viable physics-based reliability plan to model the design-level variable uncertainties at the component and system levels is outlined, and potential benefits are elucidated. The plan involves the interaction of different disciplines, maintaining the physical and probabilistic correlations at all the levels, and a verification process based on rational short-term tests. In addition, both top-down and bottom-up coherency were maintained to follow the physics-based design process and mission requirements. The outlined reliability assessment approach provides guidelines to improve the design and identifies governing variables to achieve high reliability in the Stirling Radioisotope Generator design.
Book Synopsis Radioisotope Power Systems by : National Research Council
Download or read book Radioisotope Power Systems written by National Research Council and published by National Academies Press. This book was released on 2009-07-14 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spacecraft require electrical energy. This energy must be available in the outer reaches of the solar system where sunlight is very faint. It must be available through lunar nights that last for 14 days, through long periods of dark and cold at the higher latitudes on Mars, and in high-radiation fields such as those around Jupiter. Radioisotope power systems (RPSs) are the only available power source that can operate unconstrained in these environments for the long periods of time needed to accomplish many missions, and plutonium-238 (238Pu) is the only practical isotope for fueling them. Plutonium-238 does not occur in nature. The committee does not believe that there is any additional 238Pu (or any operational 238Pu production facilities) available anywhere in the world.The total amount of 238Pu available for NASA is fixed, and essentially all of it is already dedicated to support several pending missions-the Mars Science Laboratory, Discovery 12, the Outer Planets Flagship 1 (OPF 1), and (perhaps) a small number of additional missions with a very small demand for 238Pu. If the status quo persists, the United States will not be able to provide RPSs for any subsequent missions.
Download or read book Research & Technology 2004 written by and published by DIANE Publishing. This book was released on with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stirling Convertor Fasteners Reliability Quantification by : Ashwin R. Shah
Download or read book Stirling Convertor Fasteners Reliability Quantification written by Ashwin R. Shah and published by BiblioGov. This book was released on 2013-07 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Onboard Radioisotope Power Systems (RPS) being developed for NASA s deep-space science and exploration missions require reliable operation for up to 14 years and beyond. Stirling power conversion is a candidate for use in an RPS because it offers a multifold increase in the conversion efficiency of heat to electric power and reduced inventory of radioactive material. Structural fasteners are responsible to maintain structural integrity of the Stirling power convertor, which is critical to ensure reliable performance during the entire mission. Design of fasteners involve variables related to the fabrication, manufacturing, behavior of fasteners and joining parts material, structural geometry of the joining components, size and spacing of fasteners, mission loads, boundary conditions, etc. These variables have inherent uncertainties, which need to be accounted for in the reliability assessment. This paper describes these uncertainties along with a methodology to quantify the reliability, and provides results of the analysis in terms of quantified reliability and sensitivity of Stirling power conversion reliability to the design variables. Quantification of the reliability includes both structural and functional aspects of the joining components. Based on the results, the paper also describes guidelines to improve the reliability and verification testing.
Book Synopsis Radioisotope Power Systems by : National Research Council
Download or read book Radioisotope Power Systems written by National Research Council and published by National Academies Press. This book was released on 2009-08-14 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spacecraft require electrical energy. This energy must be available in the outer reaches of the solar system where sunlight is very faint. It must be available through lunar nights that last for 14 days, through long periods of dark and cold at the higher latitudes on Mars, and in high-radiation fields such as those around Jupiter. Radioisotope power systems (RPSs) are the only available power source that can operate unconstrained in these environments for the long periods of time needed to accomplish many missions, and plutonium-238 (238Pu) is the only practical isotope for fueling them. Plutonium-238 does not occur in nature. The committee does not believe that there is any additional 238Pu (or any operational 238Pu production facilities) available anywhere in the world.The total amount of 238Pu available for NASA is fixed, and essentially all of it is already dedicated to support several pending missions-the Mars Science Laboratory, Discovery 12, the Outer Planets Flagship 1 (OPF 1), and (perhaps) a small number of additional missions with a very small demand for 238Pu. If the status quo persists, the United States will not be able to provide RPSs for any subsequent missions.
Book Synopsis Safety Analysis for a Radioisotope Stirling Generator by :
Download or read book Safety Analysis for a Radioisotope Stirling Generator written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Idaho National Laboratory (INL) is conducting safety analyses of various lowpower Radioisotope Stirling Generator (RSG) design concepts for the U.S. Department of Energy. These systems are electrical power generators converting thermal energy from plutonium (238Pu) decay to electrical energy via a Stirling cycle generator. The design and function are similar to the RTG (Radioisotope Thermoelectric Generator) used in space missions since the early 1960's, with a more efficient Stirling cycle generator replacing the proven thermoelectric converter. This paper discusses the methods the INL is employing in the safety analysis effort, along with the software tools, lessons learned, and results. The overall goal of our safety analyses is to determine the probability of an accidental plutonium release over the life of the generator. Historical accident rates for various transportation modes were investigated using event tree methods. Source terms were developed for these accidents including primarily impact, fire, and creep rupture. A negative result was defined as rupture of the tantalum alloy containment vessel surrounding the encapsulated plutonia pellet. Damage due to identified impact accidents was evaluated using non-linear finite element software tools. Material models, gathered from a wide variety of sources, included strain-rate and temperature dependencies on yield strength, strain hardening, and rupture. Both individual component and overall system simulation results will be validated by impact testing to be conducted by Los Alamos National Laboratory. Results from deterministic impact, fire, and creep rupture analyses were integrated into the probabilistic (Monte Carlo) risk assessment by correlation functions relating accident parameters to component damage. This approach presented challenges, which are addressed. Other significant issues include limitations of reliable material data at high temperatures and strainrates and development of a technique to predict crack size in failed containment material necessary for estimating source terms. Accident rates have been compiled from historical data for several possible transportation vehicles including trucks and aircraft. Impact analyses completed thus far indicate that the primary containment vessel survives ground based accidents with no release of plutonia to the environment.
Book Synopsis NASA GRC Technology Development Project for a Stirling Radioisotope Power System by : Lanny G. Thieme
Download or read book NASA GRC Technology Development Project for a Stirling Radioisotope Power System written by Lanny G. Thieme and published by . This book was released on 2000 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spacecraft Power Systems by : Mukund R. Patel
Download or read book Spacecraft Power Systems written by Mukund R. Patel and published by CRC Press. This book was released on 2004-11-29 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: The power systems of space vehicles have undergone significant development during the previous decade, and will continue to do so in the immediate future. Until now, except for the scattered results of conferences and a few publications with sketchy coverage, no single volume has covered the entire spectrum of the subject. Spacecraft Power
Book Synopsis Space Power Systems by : Nathan Snyder
Download or read book Space Power Systems written by Nathan Snyder and published by Elsevier. This book was released on 2012-12-02 with total page 651 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space Power Systems covers systems based on the three primary sources of energy of practical value, namely, solar, nuclear, and chemical sources. This book is organized into four parts encompassing 32 chapters that also explore the requirements for space power. Part A presents the general aspects of solar cell power systems based on the work performed for US space vehicles that are to be placed in orbit. This part specifically considers a graph showing the variation of characteristic parameters of the solar cell battery storage system as a function of flight altitude. Considerable chapters in this part are devoted to the solar cell power plant for the space vehicles ADVENT, RANGER, TIROS, and TRANSIT. The remaining chapters provide a detailed analysis of the physics and engineering of solar panel and solar mirror design. Part B contains a series of papers involving the various aspects of the Atomic Energy Commission SNAP (Systems for Nuclear Auxiliary Power) program. Many details are presented for the 3 kw, liquid metal, turbo-machinery SNAP II power systems covering subjects from the basic concept through vehicle integration and safety aspects. Significant chapters in this part discuss the compact and apparently highly reliable radioisotope thermoelectric generator. Part C highlights the methods of storing and expelling high energy cryogenic fuels, which can provide from two to five times more energy per unit weight than the silver-zinc primary battery. Part D provides an interesting and useful estimation of the many requirements that are likely to become firm for space vehicles. Space vehicle engineers, designers, and researchers will find this book invaluable.
Book Synopsis Technology Development for a Stirling Radioisotope Power System for Deep Space Missions by :
Download or read book Technology Development for a Stirling Radioisotope Power System for Deep Space Missions written by and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ALSEP Termination Report by : James R. Bates
Download or read book ALSEP Termination Report written by James R. Bates and published by . This book was released on 1979 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report to Congress of the Atomic Energy Commission by : U.S. Atomic Energy Commission
Download or read book Annual Report to Congress of the Atomic Energy Commission written by U.S. Atomic Energy Commission and published by . This book was released on 1969 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Appropriations. Subcommittee on Public Works Publisher : ISBN 13 : Total Pages :1382 pages Book Rating :4.F/5 ( download)
Book Synopsis Public Works for Water and Power Development and Energy Research Appropriations for Fiscal Year 1978 by : United States. Congress. Senate. Committee on Appropriations. Subcommittee on Public Works
Download or read book Public Works for Water and Power Development and Energy Research Appropriations for Fiscal Year 1978 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Public Works and published by . This book was released on 1977 with total page 1382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation Safety and Major Activities in the Atomic Energy Programs by : U.S. Atomic Energy Commission
Download or read book Radiation Safety and Major Activities in the Atomic Energy Programs written by U.S. Atomic Energy Commission and published by . This book was released on 1967 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technology Development for a Stirling Radioisotope Power System by :
Download or read book Technology Development for a Stirling Radioisotope Power System written by and published by . This book was released on 2000 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
