002891541 001__ 2891541
002891541 003__ SzGeCERN
002891541 005__ 20240925141901.0
002891541 0247_ $$2DOI$$a10.1080/00295639.2022.2108643
002891541 0248_ $$aoai:cds.cern.ch:2891541$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
002891541 041__ $$aeng
002891541 100__ $$aAthanasakis-Kaklamanakis, Michail$$uCERN$$uLeuven U.$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany$$vCurrent address: KU Leuven, Instituut voor Kern- en Stralingsfysica, Leuven B-3001, Belgium and CERN, Experimental Physics Department, CH-1211 Geneva 23, Switzerland
002891541 245__ $$aIdentifying Thermodynamic Mechanisms Affecting Reactor Pressure Vessel Integrity During Severe Nuclear Accidents Simulated by Laser Heating at the Laboratory Scale
002891541 260__ $$c2023
002891541 269__ $$c2023
002891541 300__ $$a17 p
002891541 520__ $$an this work, laser heating is used to experimentally investigate the high-temperature behavior of the U-Fe-Zr-O system using arc-melted samples with various nominal compositions. Three-phase transitions are observed in the vicinity of ~1100, ~1700, and ~2200 K. Principal component analysis of the phase transition temperatures in the course of laser-heating thermal cycling indicates that the phase transition around ~1100 K is driven by the interaction of stainless steel (SS) with metallic U, the phase transition around ~1700 K by the melting of stainless steel, and the phase transition above ~2000 K by the eutectic melting of UO2. The results also reveal two hitherto overlooked interactions in the U-Fe-Zr-O system, which could have severe consequences for the contain-ment of corium inside the reactor pressure vessel (RPV). First, the phase transition temperatures of the samples varied extensively as a result of the laser-driven rapid thermal cycling. Variations of up to 390 K were observed in the phase transition temperatures, suggesting that depending on the initial conditions of corium formation, the corium-driven ablation of the RPV wall could commence significantly earlier than the current state-of-the-art severe accident codes would predict. Additionally, evidence of a large exothermic reaction between zirconium and molten steel was observed upon SS melting. Such phenomenon may also be driven by material segregation during fast heating and cooling. If such a mechanism is activated during a severe nuclear accident, it can have an important impact on the overall thermal balance of the RPV.
002891541 540__ $$3Publication$$aCC-BY-NC-ND-4.0$$fOther$$uhttp://creativecommons.org/licenses/by-nc-nd/4.0/
002891541 542__ $$3Publication$$dThe Author(s)$$g2022
002891541 65017 $$2SzGeCERN
002891541 690C_ $$aARTICLE
002891541 690C_ $$aCERN
002891541 700__ $$aManara, Dario$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aVlahovic, Luka$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aRobba, Davide$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aBoboridis, Konstantinos$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aErnstberger, Markus$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aEloirdi, Rachel$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aAmador, Pedro$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 700__ $$aKonings, Rudy J.M.$$vEuropean Commission Joint Research Centre Karlsruhe, P.O. Box 2340, Karlsruhe, D-76125, Germany
002891541 773__ $$c381-397$$pNucl. Sci. Eng.$$v197$$y2023
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002891541 916__ $$sh$$w202411$$y2024
002891541 960__ $$a13
002891541 980__ $$aARTICLE