sodium borosilicate glass
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2022 ◽  
Author(s):  
Adam J Fisher ◽  
Hao Ding ◽  
Prashant Rajbhandari ◽  
Brant Walkley ◽  
Lewis R Blackburn ◽  
...  

Within the context of the UK’s radioactive waste vitrification programme, which utilises a lithium-sodium borosilicate glass modified with CaO and ZnO to immobilise high level nuclear waste, an investigation was...


Author(s):  
Ganesh Vythilingam ◽  
Parimal Pramod Kulkarni ◽  
Arun Nayak

Abstract Some of the advanced nuclear reactors employ an ex-vessel core catcher to mitigate core melt scenarios by stabilizing and cooling the corium for prolonged period by strategically flooding it. The side indirect cooling with top flooding strategy described in this study may lead to water ingression either through the melt crust which may lead to interaction between un-oxidised metal in the melt and water leading to hydrogen production. In order to avoid this deleterious scenario, water ingression into the bulk of the melt should be avoided. The studies described in this manuscript show that water ingression depends on the flooding strategy, i.e. the time delay between top flooding and melt relocation. Two experiments under identical conditions of simulant temperature, melt material and test section geometry were conducted with simulated decay heat of 1 MW/m3. Sodium borosilicate glass was used as the corium simulant. In the first experiment, water was flooded onto the top of melt pool soon after melt relocation. In the second experiment, water flooding at the top of melt pool was made after 30 minutes of the melt relocation. The results show that a finite time delay of introduction of water onto the top of the melt pool is paramount to engender the development of a stable crust around the melt and therefore eliminating water ingression into melt pool and ensuring controlled coolability of the melt.


2021 ◽  
Vol 47 (4) ◽  
pp. 329-333
Author(s):  
T. V. Antropova ◽  
S. V. Stolyar ◽  
I. N. Anfimova ◽  
M. A. Girsova

Abstract The results of a study of the rheological properties (shrinkage on heating, viscosity) of porous glasses (PGs) obtained as a result of through acid leaching of two-phase sodium borosilicate glass doped with small additives of P2O5 and fluoride ions, as well as bismuth-containing PGs and quartzoid glasses based on them, depending on the temperature of the heat treatment of the PG and in comparison with the characteristics of the samples obtained from sodium borosilicate glass without additives, are presented. It is found that doping glass with the indicated impurities leads to a decrease in the thermal resistance of the obtained PGs and bismuth-containing PGs. The introduction of bismuth nitrate into PG in the case of the low-temperature treatment (at 120°C) lowers the temperature for the same viscosity values of quartzoid glasses by 15–20°C, in contrast to samples without additives, as well as from higher-temperature treatment (at 650°C) PGs with additives.


AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035208
Author(s):  
Yuya Takada ◽  
Keigo Yamamoto ◽  
Atsushi Kinomura ◽  
Takeshi Saito ◽  
Nobuyuki Ichinose ◽  
...  

Optik ◽  
2021 ◽  
Vol 229 ◽  
pp. 166225
Author(s):  
Sile Mao ◽  
Deshmukh Abdul Hakeem ◽  
Shaoshan Su ◽  
Hongli Wen ◽  
Wei Song

Author(s):  
Nicholas Stone-Weiss ◽  
Nicholas J Smith ◽  
Randall Yougman ◽  
Eric Pierce ◽  
Ashutosh Goel

Understanding the corrosion behavior of glasses in near-neutral environments is crucial for many technologies including glasses for regenerative medicine and nuclear waste immobilization. To maintain consistent pH values throughout experiments...


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