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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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!
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Latest News
Virginia utility considers SMRs
Dominion Energy Virginia has issued a request for proposals from leading nuclear companies to study the feasibility of putting a small modular reactor at its North Anna nuclear power plant.
While the utility says it is not a commitment to build an SMR at the site, the RFP is “an important first step in evaluating the technology and the North Anna site to support Dominion Energy customers’ future energy needs consistent with the company’s most recent Integrated Resource Plan.”
Tsutomu Sakurai, Akira Takahashi, Niroh Ishikawa, Yoshihide Komaki, Mamoru Ohnuki, Takeo Adachi
Nuclear Technology | Volume 99 | Number 1 | July 1992 | Pages 70-79
Technical Paper | Enrichment and Reprocessing System | doi.org/10.13182/NT92-A34704
Articles are hosted by Taylor and Francis Online.
Spent-fuel specimens (∼3 g each) with a burnup of 21 to 39 GWd/t were dissolved in 30 ml of 4 M HNO3 at 100°C, and the distribution of iodine and its chemical forms in the solution were studied. A small quantity of the iodine was conveyed to the insoluble residue (up to 2.3%), some remained in the fuel solution (up to 9.7%), and the balance was in the off-gas. Iodine was not deposited on the fuel cladding. Organic iodides were only ∼6.5% or less of the total amount of iodine in the off-gas. The fuel solution included iodine species that were difficult to expel by NO2 sparging alone (27 to 46% of the iodine in the solution). These species were ascribed to be the colloids of AgI and Pdl2. Io-date () was a rather minor iodine species in dissolution in ∼4 M HNO3. A thermochemical calculation also supports these results, indicating that the quantity of is ≦ 1.7 × 10−4% of the iodine fed to 4 M HNO3 and that the colloid of Agl can be formed when the concentration of I- is ≧ 5.3 × 10−10 M. For this calculation, the solubilities of Agl and PdI2 in water were measured: They are 6.5 × 10−8 and 6.3 × 10−7 M, respectively, at 90°C. According to supplemental experiments using a simulated spent-fuel solution and 1311, NOx sparging, previously proposed by earlier workers for expulsion of from the fuel solution, retards the rate of decomposition of the colloid. The thermochemical calculation indicates this is because the equilibrium concentration of I- in 3 M HNO3 is increased two orders of magnitude (1.7 × 102 times) by sparging with 10% NO2. The NO2 sparging brings the concentration of I- close to the solubility of Agl and suppresses the decomposition of its colloid into I2. Heating the solution without NO2 sparging was effective for the decomposition of the colloid, and the addition of excess amounts of accelerates its rate of decomposition.