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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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August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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.”
Daniel Magallon, Hermann Hohmann, Hubert Schins
Nuclear Technology | Volume 98 | Number 1 | April 1992 | Pages 79-90
Technical Paper | Fast Reactor Safety / Nuclear Reactor Safety | doi.org/10.13182/NT92-A34652
Articles are hosted by Taylor and Francis Online.
Two experiments known as Tl and T2 are performed in the test section TERMOS of the FARO facility. Quantities of the order of 100 kg of molten pure UO2 ∼3000°C are poured into 130 kg of sodium at 400°C and 0.1 MPa contained in a 0.28-m-diam test tube over a height of 2.5 m. The tests show a melt delivery rate twice as high in T2 as in Tl. Because of the large scale of the experiment, the tests reveal new features concerning this type of interaction. Particularly, fuel/coolant interaction (FCI) occurs that induces stepwise penetration and dispersion of the melt, and a limitation of the melt quantity that could penetrate into the sodium. Sodium pressure peaks up to 6.0 MPa and pressurizations of the 0.150-m3 gas phase blanket up to 0.8 MPa are recorded. These FCIs are interpreted as vapor explosions in nearly saturated sodium. Quantities of 60 kg for Tl and 45 kg for T2 of UO2 fragments are collected in the debris catcher located at the bottom of the test tube. A debris bed structure resulting from this type of interaction is identified and characterized. Porosity is almost constant all over the bed height while permeability increases by a factor of 30 when going from the top to the bottom of the bed.