ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
Fusion Science and Technology
Latest News
Judge temporarily blocks DOE’s move to slash university research funding
A group of universities led by the American Association of Universities (AAU) acted swiftly to oppose a policy action by the Department of Energy that would cut the funds it pays to universities for the indirect costs of research under DOE grants. The group filed suit Monday, April 14, challenging a what it termed a “flagrantly unlawful action” that could “devastate scientific research at America’s universities.”
By Wednesday, the U.S. District Court judge hearing the case issued a temporary restraining order effective nationwide, preventing the DOE from implementing the policy or terminating any existing grants.
Paresh Patel, C. B. Sumod, D. P. Thakkar, L. N. Gupta, V. B. Patel, L. K. Bansal, K. Qureshi, V. Vadher, U. K. Baruah, N. P. Singh
Fusion Science and Technology | Volume 64 | Number 1 | July 2013 | Pages 39-44
Technical Paper | doi.org/10.13182/FST13-A17045
Articles are hosted by Taylor and Francis Online.
Regulated high-voltage power supplies (RHVPSs) have been developed at Institute for Plasma Research and utilized for neutral beam and radio-frequency heating applications of the steady-state superconducting tokamak (SST-1) up to 80-kV, 130-A rating. They were developed in-house and are being delivered to different research institutes for various applications.The RHVPS delivers power to various loads at the megawatt level. These loads have very low fault energy tolerance; therefore, fault protection is mandatory. In addition to this, at each stage of the power transformation/conversion, a special diagnosis is necessary to protect the power supply components. Also, the output fault protection has to be done in such a manner that fault energy is not more than 10 J. In fault conditions, the output has to be turned off within 2 s. Having these requirements, an output fault-protection system has been developed with suitable sensors and to manage fast turn off, choosing appropriate components.The multiple-secondary transformers (two of them, each at a 5.6 MVA rating with 40 outputs) are used at the front end of the RHVPS. They may become damaged for overload at any one of their secondaries, while remaining secondaries carry much less current or no current. Such a localized overload is not sufficient for tripping the main circuit breaker, whose tripping level is set to an actual overload of the transformer. A special technique is applied to sense and diagnose this fault in addition to routine overload sensing. Differentiation of such a typical fault from a real overload condition is done by sensing and monitoring the primary current of the transformer with reference to different operating scenarios. Electronic means are used for fast detection and isolation of the RHVPS from the utility supply. The presented system effectively protects the transformer from fault at any one of its 40 secondaries and in an actual overload situation.This paper describes an overall RHVPS power scheme along with output fault protection and an internal fault diagnosis system and test results thereof.
