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Livrables
The main objective of the DEEPSSI project was to design and test innovative steam injector designs. The CLAUDIA and IETI tests have demonstrated that the considered options lead to a more efficient steam injector. For steam injectors with annular water injection, central steam injection and no overflow in the mixing chamber, a significant performance improvement has been obtained.
For WWER applications, an extrapolated SI design has been proposed. An experimental program will be necessary to have an industrial qualification of these proposals. For more demanding applications (like in the EPR conditions), more revolutionary design should be proposed for a single -stage steam injector, an alternative is to study the possibility of combining two apparatus in order, for example, to increase the pressure in two steps.
As far as the model development is concerned, the CATHARE capabilities, regarding steam injector modelling, have been confirmed. There are still some studies to conduct in order to have a model with better predictive capabilities, especially if other steam injector types are considered (with central water injection for example).
The SI CATHARE model of the extrapolated SI design has been used in a complex WWER plant input data deck. A quite satisfactory behaviour of this complex model has been obtained calculating a blackout accident.
The DEEPSSI project has been a successful collaboration, even if the SI design tested was not as good as expected. The DEEPSSI partners are now analysing very carefully all these results obtained in order to evaluate the interest to launch a complementary program.
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