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
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
April 2025
Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
Dan Gabriel Cepraga, Gilio Cambi, Manuela Frisoni, Gian Carlo Panini
Fusion Science and Technology | Volume 34 | Number 3 | November 1998 | Pages 969-973
Neutronics Experiments and Analysis (Poster Session) | doi.org/10.13182/FST98-A11963738
Articles are hosted by Taylor and Francis Online.
The ANITA-4/F is a code package for the activation characterisation of materials exposed to neutrons in fusion machines. The package has been intensively used by ENEA for safety assessment of the International Thermonuclear Experimental Reactor ITER to evaluate the activated corrosion product source terms. This paper presents a summary description of the package and gives the details of its capabilities. The main component of the package is an updated version of the activation code ANITA that computes the radioactive inventory of a material subject to neutron irradiation, continuous or stepwise. It provides activity, atomic density, decay heat, biological hazard and gamma-ray source of each nuclide; total activity, decay heat, contact dose equivalent, gamma-ray spectra and other relevant parameters, for the irradiated material, versus cooling time. As an option, those parameters may be plotted by the GRANITA module, as a function of the cooling time. The code is provided with a complete data base that includes: 1) the FENDL/A-2 neutron activation data libraries (both for the standard 100 GAM-II and 175 VITAMIN-J groups structure), 2) the FENDL/D-2 decay data library, 3) the ICRP dose coefficients for ingestion and inhalation of radionuclides. Arbitrary structure can be used for the neutron irradiation spectrum. It is internally converted to one of the standard structures. Continuous or multi-steps (up to 2000 burn-dwell intervals) can be considered for the operational scenario. A different level of the irradiation flux can be used for each one of the exposure time step. The paper presents also, as an example, an application to the neutron exposure characterisation for the AISI 316 LN of the first wall, with reference to the basic performance phase of ITER.