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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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Findings of the ANS Executive Order Expert Advisory Group
On May 23, President Donald Trump signed four Executive Orders (EOs) designed to “usher in a nuclear energy renaissance” by building on federal policies and programs and directing efficiencies in the licensing, siting, development, and deployment of advanced reactor technologies.
In order to evaluate the specific proposals contained in the EOs, a group of experts was convened from various sectors of the U.S. nuclear technology enterprise, under the auspices of the ANS External Affairs Committee, to compare the EOs against existing ANS board-approved Position Statements and to offer constructive input for subsequent implementation by the Trump administration.
The group’s findings and feedback, which were delivered by ANS CEO Craig Piercy to ANS President Lisa Marshall and the Board of Directors, are listed below, grouped by individual EO.
S. Sunder
Nuclear Technology | Volume 144 | Number 2 | November 2003 | Pages 259-273
Technical Paper | Materials for Nuclear Systems | doi.org/10.13182/NT03-A3443
Articles are hosted by Taylor and Francis Online.
The relationship between molybdenum oxidation state and iodine volatility in nuclear fuel was investigated using high-temperature Knudsen cell-mass spectroscopy. It was observed that the ratio of the intensities of molecular iodine ions I2+ and CsI+ in the Knudsen cell-mass spectroscopic experiments can be used to investigate the iodine volatility in fuel under different conditions. The experiments show that the iodine volatility is similar in systems consisting of CsI alone, CsI/UO2, and CsI/UO2/MoOx (with molybdenum in oxidation states 0, 2, and 4). The iodine volatility is much higher, however, in CsI/UO2/MoO3 systems (with molybdenum in oxidation state = 6). The iodine volatility in the fuel increases significantly if oxidation of the molybdenum goes to the MoO3 stage. The increase in the iodine volatility is caused by the formation of elemental iodine from cesium iodide. It is concluded from these measurements that the oxidation of the fuel to the UO2.2 will substantially increase the volatilization of fission product iodine. An analysis of the literature data suggests that the enhanced iodine volatilization process may be initiated when the fuel is oxidized to UO2.02.
