Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2012. / Cataloged from PDF version of thesis. "This study is part of a research project sponsored by EDF at MIT"--P. 3. / Includes bibliographical references (p. 175-178). / During the past twenty-five years, the US Nuclear Regulatory Commission has been progressing toward a more risk-informed, performance-based regulation. This regulatory framework has effectively supported the development of online maintenance practices. In France, while the safety authority has been encouraging particular risk-informed applications, PRA (Probabilistic Risk Assessment) techniques have not penetrated the nuclear regulatory framework and industry to the same extent. After presenting relevant differences between the French and US nuclear industries and regulatory frameworks, the development and use of risk-informed applications in both countries are reviewed. In the United States, these techniques are usually well-accepted and have brought positive results regarding operational performance, plant safety and regulatory efficiency. In France, there have been in some cases difficulties regarding the acceptability of these techniques with the safety authority, but also within the operating company. While PRA results are commonly used in the US at the operational level through the use of risk-monitors, there appear to be in France obstacles to such practices. Online maintenance regulations and practices are then presented. US technical specifications provide much flexibility to voluntarily enter technical specifications action statements for online maintenance. As a result, following the implementation of the Maintenance Rule, online maintenance has been increasingly applied, leading to operational as well as safety improvements. In France technical specifications are more restrictive regarding these aspects, and online maintenance of safety-significant systems is often not allowed or allowed under restrictive conditions. A case study concerning the maintenance of emergency diesel generators and emergency core cooling systems is presented to illustrate and study these points in more detail. Finally, possible directions to facilitate the implementation of an online maintenance strategy in France are identified, and their implications are discussed. / by Edouard Verdier. / S.M.

This dissertation examines the operation of neoliberal environmentality through the instrumentalization of the Greater Sage-grouse (Centrocercus urophasianus) in Wyoming. It treats technological interventions within environmental construction as generating biotic-machinic entanglements termed technonature. I present the formation and operation of the Wyoming Conservation Exchange as a case study of technonatural territorialization connected to global trona and hydrocarbon commodity flows. The theoretical framework elaborates how "the environment" is constructed and governed through tactical instrumental deployments connected to technocratic management allowing economically powerful actors to inscribe their desires within Wyoming's landscape, politics and biota as a function of environmental security related to commodity development. The question motivating this work is "Whose environment is the Environmental Defense Fund defending?" The Greater Sage-grouse has become an object of U.S. Federal environmental governance since the late 1990's. It has experienced significant population declines due to anthropogenic disturbance and habitat loss through industrial action across its range. Wyoming's Sagebrush Steppe contains 37.5% of the remaining range wide population. The grouse was listed as a candidate species under the 1973 U.S. Endangered Species Act triggering responses from Federal, State, and international wildlife management agencies, as well as environmental non-governmental organizations. Wyoming could lose nearly a quarter of its surface should Federal regulations require the designation of critical sage-grouse habitat. Governor Dave Freudenthal signed Executive Order 2008-2 into law in response to the regulatory threat to Wyoming's hydrocarbon and mineral based economy. The grouse, in response was de-listed as a candidate species in 2015 by the U.S. Fish and Wildlife Service. EO 2008-2 established the Wyoming Core Area Strategy as a statewide conservation umbrella and laid the framework for a habitat mitigation economy allowing industrial activity to continue within sage-grouse habitat. This incentivized the Environmental Defense Fund (EDF) to test a market-based instrument – a habitat exchange – within Wyoming. The Greater Sage-grouse is a test species as it is highly sensitive to changes in its environment and this dissertation examines how the habitat mitigation economy advanced by EDF is drawing the grouse into global commodity networks as a territorialization process for global flows of hydrocarbons and minerals. At stake is the ability to write the history of the species, land, and the global environment as EDF develops conservation technologies prioritizing flows critical to the hydrocarbon environment through the technology of the Wyoming Conservation Exchange. / Doctor of Philosophy / The Greater Sage-grouse (Centrocercus urophasianus) entered Euro-American scientific study as early as the Lewis and Clark expedition as they explored the Intermountain region of Western North America. The first thorough scientific study of the sage-grouse in the 20th Century, The Sage Grouse in Wyoming, by Dr. Robert Lansing Patterson included the effects of anthropogenic disturbance on grouse populations. Since the 1952 publication of Patterson's study, Greater Sage-grouse numbers have been declining as the bird loses its home to encroachments such as urbanization, agriculture, grazing, mining, and fossil fuel extraction. The last stronghold of the grouse is the Sagebrush Steppe within Wyoming containing nearly 40% of the remaining population. Known for its flamboyant mating displays, the ground-dwelling avian species has become a political flashpoint in conservation, land management, and environmental circles as its numbers declined steadily since the 1990's due to an accelerating energy boom threatening its habitat. The bird became a threat to extractive industry in Wyoming at the turn of the Millennium as environmentally concerned groups petitioned the U.S. Fish and Wildlife Service (UFWS) to evaluate its populations under the Endangered Species Act (ESA). Nearly a quarter of Wyoming's surface would be strictly policed as critical habitat were the grouse listed as endangered or threatened under the ESA. Wyoming and its partners created the Wyoming Core Area Protection Strategy (CAP) as a wildlife management framework through Executive Order 2008-2. The Wyoming CAP includes the foundation of a habitat mitigation economy allowing industry to trade surface disturbances within critical sage-grouse habitat for modified land purportedly to the benefit of the species. The Nature Conservancy invited the Environmental Defense Fund to form the Wyoming Conservation Exchange – a market-based conservation instrument tailored to trading in habitat mitigation credits. This dissertation studies the Wyoming Conservation Exchange as an instrument connected to larger networks of wildlife management agencies, non-governmental organizations, and mining and fossil fuel interests. It evaluates the effects of the Wyoming Conservation Exchange and the economy it seeks to establish as changing how the environment is managed across the Sagebrush Steppe. Environmental Defense Fund's conservation instrument is reviewed through the economy created for and through the Greater Sage-grouse as an object of environmental governance. Habitat offsetting can, has and will change the physical, and political environment of Wyoming allowing powerful actors to write the rules of how the environment should be managed. As such, this dissertation questions whose environment the Environmental Defense Fund is defending as it explores sage-grouse management within the state.

The Pecan Street Project (PSP) is a public-private initiative that seeks to establish the City of Austin and its electric utility, Austin Energy (AE), as leaders in developing the electric utility system of the future and clean energy economy. The four main components of the project are to: 1) develop a local, public-private consortium dedicated to research and development of clean energy technologies and distributed power generation; 2) open the city’s electric grid to act as a lab to test emerging clean energy technologies; 3) develop a new business model to ensure AE’s continued profitability; and 4) show the world how the new business and systems model can work. This report provides a case study of PSP and describes an analytical approach for evaluating projects, programs, and policies proposed by PSP working groups to develop a cleaner, more efficient electric system. This report includes a history of the project, discusses opportunities and challenges identified by PSP, and evaluates the potential economic, environmental, system, and other impacts of different project ideas through a technical analysis. This report concludes with a series of recommendations to PSP and identifies policy implications for the City of Austin, AE, other policymakers, and other electric utilities. / text

[ES] La presente tesis doctoral investiga las posibilidades del arte colaborativo comprometido con la defensa socio-ambiental a través de una práctica y metodología interdisciplinar llevada a cabo entre 2016 y 2022 por Bea Millón en diferentes contextos del territorio mexicano. A través de cuatro series, reformula las relaciones con el territorio, acciona proyectos críticos, anti-coloniales y ecologistas en diálogo con realidades corporales, materiales, y ambientales diversos. Estas series, que devienen en múltiples proyectos desarrollados principalmente en contextos extractivos, son a su vez investigaciones que producen otros saberes, sensibilidades y estrategias que retroalimentan la lucha por los bienes naturales desde el arte contemporáneo. / [CA] La present tesi doctoral investiga les possibilitats de l'art col·laboratiu compromés amb la defensa soci-ambiental a través d'una pràctica i metodologia interdisciplinària duta a terme entre 2016 i 2022 per Bea Millón en diferents contextos del territori mexicà. A través de quatre sèries, reformula les relacions amb el territori, acciona projectes crítics, anti-colonials i ecologistes en diàleg amb realitats corporals, materials, i ambientals diversos. Aquestes sèries, que esdevenen en múltiples projectes desenvolupats principalment en contextos extractius, són al seu torn investigacions que produeixen altres sabers, sensibilitats i estratègies que retroalimenten la lluita pels béns naturals des de l'art contemporani. / [EN] This doctoral thesis investigates the possibilities of collaborative art committed to socio-environmental defense through an interdisciplinary practice and methodology carried out between 2016 and 2022 by Bea Millón in different contexts of the Mexican territory. Through four series, he reformulates relations with the territory, activates critical, anti-colonial and ecological projects in dialogue with various bodily, material and environmental realities. These series, which come in multiple projects developed mainly in extractive contexts, are in turn investigations that produce other knowledge, sensibilities and strategies that feed back the fight for natural assets from contemporary art. / La presente tesis doctoral recoge la labor plurianual de investigación teórico-práctica llevada a cabo dentro del programa de doctorado Arte: Producción e investigación de la Facultad de Bellas Artes de la Universitat Politècnica de València, con el apoyo del sistema de Formación de Profesorado Universitario de Doctorado FPU promovido por el Ministerio de Educación (FPU 2016). / Millón Sánchez, B. (2023). Roza, tumba y quema. Acompañamientos artísticos a la defensa del territorio mexicano (2016-2022) [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/193658