Synthesis report about the updated methodology for demonstration of In-Vessel melt retention
The report describes the updated methodology to be used for safety demonstration of In-Vessel Retention Strategy in “high power” reactors. Starting from the methodology used for VVER-440 plants, it is explained how some assumptions must be abandoned and replaced by a more detailed evaluation. One of the most important points is the consideration of transient states of the corium pool which might cause higher thermal load on the vessel than in steady-state. Another important point is the consideration of detailed mechanical calculations in the cases of very thin remaining vessel thickness. Finally, the methodology introduces a new safety criterion, based on the residual vessel thickness, which is more general than the previously used criterion (based on a comparison of heat fluxes).
BRUMM Stephan;
SANGIORGI Marco;
FICHOT Florian;
CARENINI Laure;
2021-01-28
Publications Office of the European Union
JRC119020
978-92-76-15089-3 (online),
1831-9424 (online),
EUR 30056 EN,
OP KJ-NA-30056-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC119020,
10.2760/56153 (online),
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